{"id":2602,"date":"2020-08-27T08:14:14","date_gmt":"2020-08-27T08:14:14","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=2602"},"modified":"2026-09-18T06:22:18","modified_gmt":"2026-09-18T06:22:18","slug":"lhc-casting-system","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/","title":{"rendered":"LHC Casting System for Aluminum Slab Ingot Production"},"content":{"rendered":"<p class=\"isSelectedEnd\">Yang <strong>LHC (Low Head Composite) casting system<\/strong> is a low-metal-level direct chill (DC) casting technology used to produce aluminum rolling ingots and slabs. By maintaining a relatively low metal level in the mold and using a graphite-lined mold interface with controlled cooling, LHC casting can improve ingot surface quality, reduce surface defects and segregation-related problems, and lower the amount of material removed during scalping and hot-rolling edge trimming.<\/p>\n<p class=\"isSelectedEnd\">For aluminum producers making large rolling slabs for hot and cold rolling, the quality of the molten aluminum entering the LHC mold is equally important. A typical process therefore combines alloy batching, melting, refining, <strong>penghilangan gas secara daring<\/strong>, ceramic foam filtration, grain refinement, and automated LHC casting.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Daftar Isi<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Beralih<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#What_Is_an_LHC_Casting_System\" >What Is an LHC Casting System?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#How_Does_LHC_Casting_Work\" >How Does LHC Casting Work?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#1_Alloy_Batching_and_Melting\" >1. Alloy Batching and Melting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#2_Melt_Refining_and_Temperature_Control\" >2. Melt Refining and Temperature Control<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#3_On-Line_Grain_Refinement\" >3. On-Line Grain Refinement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#4_On-Line_Degassing\" >4. On-Line Degassing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#5_Ceramic_Foam_Filtration\" >5. Ceramic Foam Filtration<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#What_Happens_Inside_an_LHC_Mold\" >What Happens Inside an LHC Mold?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#Why_Does_LHC_Use_a_Graphite_Ring\" >Why Does LHC Use a Graphite Ring?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#What_Are_the_Advantages_of_LHC_Casting\" >What Are the Advantages of LHC Casting?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#1_Better_Ingot_Surface_Quality\" >1. Better Ingot Surface Quality<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#2_Reduced_Scalping_and_Milling\" >2. Reduced Scalping and Milling<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#3_Reduced_Bottom_Curl_and_Warpage\" >3. Reduced Bottom Curl and Warpage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#4_Lower_Lubricant_Consumption\" >4. Lower Lubricant Consumption<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#5_Better_Metal_Recovery\" >5. Better Metal Recovery<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#LHC_Casting_vs_Conventional_DC_Casting\" >LHC Casting vs Conventional DC Casting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#Why_Is_Molten_Aluminum_Quality_Important_for_LHC_Casting\" >Why Is Molten Aluminum Quality Important for LHC Casting?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#Typical_Melt_Treatment_System_for_LHC_Casting\" >Typical Melt Treatment System for LHC Casting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#What_Factors_Affect_LHC_Slab_Quality\" >What Factors Affect LHC Slab Quality?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#LHC_Casting_for_Aluminum_Rolling_Slabs\" >LHC Casting for Aluminum Rolling Slabs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#AdTech_Melt_Treatment_Solutions_for_LHC_Casting_Lines\" >AdTech Melt Treatment Solutions for LHC Casting Lines<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#What_Information_Is_Needed_to_Select_Equipment_for_an_LHC_Casting_Line\" >What Information Is Needed to Select Equipment for an LHC Casting Line?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.aluminiumceramicfiber.com\/id\/lhc-casting-system\/#FAQ\" >Pertanyaan yang Sering Diajukan<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_an_LHC_Casting_System\"><\/span>What Is an LHC Casting System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">LHC stands for <strong>Low Head Composite<\/strong>. It is a rolling-ingot casting technology developed for producing high-quality aluminum slabs with a lower metal head than conventional DC casting.<\/p>\n<p class=\"isSelectedEnd\">In conventional rolling-ingot DC casting, the metal level in the mold is relatively high. LHC technology uses a much lower metal level, together with a graphite-lined mold and controlled cooling system. Wagstaff, the original developer of LHC technology, describes the system as a rolling-ingot casting technology designed to improve ingot quality and recovery while reducing scalping and edge trimming.<\/p>\n<p class=\"isSelectedEnd\">The lower metal head, controlled solidification conditions, and graphite mold interface help produce a more stable casting surface and ingot geometry.<\/p>\n<div id=\"attachment_2603\" style=\"width: 510px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2603\" class=\"wp-image-2603 size-full\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/08\/LHC-Casting-System.jpg\" alt=\"Aluminum ingot casting molds being preheated before molten aluminum casting\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/08\/LHC-Casting-System.jpg 500w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/08\/LHC-Casting-System-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><p id=\"caption-attachment-2603\" class=\"wp-caption-text\">Aluminum ingot casting molds being preheated before molten aluminum casting<\/p><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_Does_LHC_Casting_Work\"><\/span>How Does LHC Casting Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">The LHC process is not simply a different mold design. The quality of the final slab depends on the entire process from alloy preparation to solidification.<\/p>\n<p class=\"isSelectedEnd\">A typical aluminum rolling-ingot production route is:<\/p>\n<p class=\"isSelectedEnd\"><strong>Aluminum liquid \/ remelt ingot \/ return scrap \u2192 Alloy batching \u2192 Melting \u2192 Refining \u2192 Degassing \u2192 Filtration \u2192 Grain refinement \u2192 LHC casting \u2192 Sawing \u2192 Inspection \u2192 Storage<\/strong><\/p>\n<p class=\"isSelectedEnd\">The exact process configuration depends on the alloy, casting equipment, plant layout, and required slab quality.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Alloy_Batching_and_Melting\"><\/span>1. Alloy Batching and Melting<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">The charge materials are selected according to the required alloy composition. Depending on the plant, the charge may include:<\/p>\n<ul data-spread=\"false\">\n<li>Electrolytic aluminum liquid<\/li>\n<li>Remelt aluminum ingots<\/li>\n<li>Return scrap<\/li>\n<li>Intermediate alloys<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">The materials are melted and adjusted to the target chemical composition.<\/p>\n<p class=\"isSelectedEnd\">For rolling alloys, chemical composition control is particularly important because defects or composition deviations introduced during melting and casting cannot simply be removed during subsequent rolling.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Melt_Refining_and_Temperature_Control\"><\/span>2. Melt Refining and Temperature Control<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">After melting, the aluminum is subjected to melt treatment to control hydrogen, non-metallic inclusions, and other impurities.<\/p>\n<p class=\"isSelectedEnd\">Typical operations include:<\/p>\n<ul data-spread=\"false\">\n<li>Furnace refining<\/li>\n<li>Stirring and homogenization<\/li>\n<li>Dross removal<\/li>\n<li>Chemical composition sampling<\/li>\n<li>Temperature adjustment<\/li>\n<li>Penghilangan Gas<\/li>\n<li>Penyaringan<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">The purpose of these operations is to deliver clean and compositionally stable molten aluminum to the casting system.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_On-Line_Grain_Refinement\"><\/span>3. On-Line Grain Refinement<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">For alloys requiring grain refinement, an aluminum-titanium-boron grain refiner wire can be continuously introduced into the launder before casting.<\/p>\n<p class=\"isSelectedEnd\">The grain refiner promotes a finer and more uniform solidification structure, helping control the grain structure of the slab.<\/p>\n<p class=\"isSelectedEnd\">The addition rate should be matched to the alloy, casting conditions, melt flow rate, and required metallurgical performance rather than treated as a fixed value for every LHC line.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_On-Line_Degassing\"><\/span>4. On-Line Degassing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">Dissolved hydrogen is one of the main gas-related concerns in molten aluminum.<\/p>\n<p class=\"isSelectedEnd\">A rotary <strong>unit penghilang gas daring<\/strong> introduces fine inert-gas bubbles into the melt. Hydrogen transfers from the molten aluminum into these bubbles and is then removed with the gas.<\/p>\n<p class=\"isSelectedEnd\">Degassing is therefore an important step before LHC casting, particularly when slab quality requirements are high.<\/p>\n<div id=\"attachment_9604\" style=\"width: 670px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9604\" class=\"size-full wp-image-9604\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX.webp\" alt=\"peralatan degassing daring\" width=\"660\" height=\"494\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX.webp 660w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX-300x225.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX-16x12.webp 16w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><p id=\"caption-attachment-9604\" class=\"wp-caption-text\"><em>peralatan degassing daring<\/em><\/p><\/div>\n<h3><span class=\"ez-toc-section\" id=\"5_Ceramic_Foam_Filtration\"><\/span>5. Ceramic Foam Filtration<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div id=\"attachment_9596\" style=\"width: 1264px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9596\" class=\"size-full wp-image-9596\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe.webp\" alt=\"filter busa keramik dari AdTech dengan gasket penyegel yang dapat diperluas\" width=\"1254\" height=\"1254\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe.webp 1254w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe-300x300.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe-1024x1024.webp 1024w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe-150x150.webp 150w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe-768x768.webp 768w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe-12x12.webp 12w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/06\/ceramic-foam-filter\u4e3b\u56fe-120x120.webp 120w\" sizes=\"auto, (max-width: 1254px) 100vw, 1254px\" \/><p id=\"caption-attachment-9596\" class=\"wp-caption-text\"><em>filter busa keramik dari AdTech dengan gasket penyegel yang dapat diperluas<\/em><\/p><\/div>\n<p class=\"isSelectedEnd\">After degassing, the molten aluminum passes through a ceramic foam filter system to remove suspended non-metallic inclusions.<\/p>\n<p class=\"isSelectedEnd\">A two-stage CFF filtration arrangement can provide additional filtration capacity and inclusion removal before the melt enters the casting mold.<\/p>\n<p class=\"isSelectedEnd\">It is important to distinguish the two processes:<\/p>\n<table>\n<tbody>\n<tr>\n<th>Treatment<\/th>\n<th>Main purpose<\/th>\n<\/tr>\n<tr>\n<td>On-line degassing<\/td>\n<td>Reduce dissolved hydrogen<\/td>\n<\/tr>\n<tr>\n<td>Penyaringan busa keramik<\/td>\n<td>Remove suspended non-metallic inclusions<\/td>\n<\/tr>\n<tr>\n<td>Grain refinement<\/td>\n<td>Control solidification grain structure<\/td>\n<\/tr>\n<tr>\n<td>Pengaturan suhu<\/td>\n<td>Maintain suitable casting conditions<\/td>\n<\/tr>\n<tr>\n<td>Chemical adjustment<\/td>\n<td>Meet the required alloy composition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"isSelectedEnd\">A clean melt entering the LHC mold provides a better starting point for controlling slab quality.<\/p>\n<p style=\"text-align: center;\" data-start=\"2234\" data-end=\"2419\"><a style=\"background-color: #fff3c4; display: inline-block; padding: 12px 28px; border-radius: 30px; color: #7a5a2a; text-decoration: none; font-size: 18px; font-weight: bold; text-align: center; border: 1px solid #E6D3A1;\" href=\"https:\/\/www.adtechaluminum.com\/product\/ceramic-foam-filter\/\" target=\"_blank\" rel=\"noopener\">Learn More About Our Molten-Aluminum Treatment<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Happens_Inside_an_LHC_Mold\"><\/span>What Happens Inside an LHC Mold?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">The key feature of LHC casting is its <strong>low metal head<\/strong>.<\/p>\n<p class=\"isSelectedEnd\">The metal level in the mold is significantly lower than that used in conventional DC rolling-ingot casting. In the process described for this application, the metal level is approximately <strong>35\u201365 mm<\/strong>.<\/p>\n<p class=\"isSelectedEnd\">The mold is lined with a graphite ring at the metal-contact area. The graphite provides a smooth mold interface and allows controlled lubrication during casting.<\/p>\n<p class=\"isSelectedEnd\">At the same time, the cooling system controls the rate at which heat is extracted from the molten aluminum.<\/p>\n<p class=\"isSelectedEnd\">The interaction between:<\/p>\n<ul data-spread=\"false\">\n<li>Low metal level<\/li>\n<li>Graphite mold interface<\/li>\n<li>Metal flow<\/li>\n<li>Cooling water<\/li>\n<li>Kecepatan pengecoran<\/li>\n<li>Melt temperature<\/li>\n<li>Automated process control<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">determines the solidification conditions and the resulting ingot quality.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Does_LHC_Use_a_Graphite_Ring\"><\/span>Why Does LHC Use a Graphite Ring?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">The graphite ring forms the working interface between the molten aluminum and the mold.<\/p>\n<p class=\"isSelectedEnd\">Its functions include:<\/p>\n<ul data-spread=\"false\">\n<li>Providing a smooth mold surface<\/li>\n<li>Supporting controlled metal movement along the mold wall<\/li>\n<li>Reducing friction at the casting interface<\/li>\n<li>Supporting consistent ingot surface formation<\/li>\n<li>Reducing the dependence on conventional liquid lubrication<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">Wagstaff reports that its LHC technology requires very little oil compared with conventional DC casting and can reduce the amount of lubricant entering the casting-water system.<\/p>\n<p class=\"isSelectedEnd\">The graphite ring is therefore not simply a wear component. Its dimensional accuracy, surface condition, installation, and lubrication method can all affect casting stability and ingot surface quality.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Are_the_Advantages_of_LHC_Casting\"><\/span>What Are the Advantages of LHC Casting?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">Compared with conventional rolling-ingot DC casting, LHC technology is designed to improve several aspects of slab production.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Better_Ingot_Surface_Quality\"><\/span>1. Better Ingot Surface Quality<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">The low metal level and controlled graphite mold interface help produce a smooth and stable ingot surface.<\/p>\n<p class=\"isSelectedEnd\">A better as-cast surface can reduce the amount of material that needs to be removed before rolling.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Reduced_Scalping_and_Milling\"><\/span>2. Reduced Scalping and Milling<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">Surface defects and the near-surface region of a rolling ingot are often removed before hot rolling.<\/p>\n<p class=\"isSelectedEnd\">LHC technology is designed to reduce the amount of material removed during this preparation stage. Wagstaff reports significant savings in scalping and edge trimming with LHC-cast ingots.<\/p>\n<p class=\"isSelectedEnd\">For the specific LHC application described by AdTech, milling reduction can exceed <strong>50%<\/strong>, while hot-rolling edge trimming can be reduced by more than <strong>15%<\/strong> under the corresponding production conditions. These figures should be treated as process-specific results rather than universal values for every LHC installation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Reduced_Bottom_Curl_and_Warpage\"><\/span>3. Reduced Bottom Curl and Warpage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">Controlled metal level and cooling conditions can improve the geometry of the solidifying ingot.<\/p>\n<p class=\"isSelectedEnd\">The LHC process is designed to reduce bottom curl and improve the overall shape of the rolling ingot.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Lower_Lubricant_Consumption\"><\/span>4. Lower Lubricant Consumption<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">The graphite-lined mold interface reduces the need for conventional lubrication.<\/p>\n<p class=\"isSelectedEnd\">Wagstaff states that LHC systems can operate with very low oil consumption compared with conventional DC casting.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Better_Metal_Recovery\"><\/span>5. Better Metal Recovery<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"isSelectedEnd\">Reducing the amount of material removed through scalping and trimming means more of the cast slab can enter the downstream rolling process.<\/p>\n<p class=\"isSelectedEnd\">This can improve overall material recovery and reduce the amount of metal returned for remelting.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"LHC_Casting_vs_Conventional_DC_Casting\"><\/span>LHC Casting vs Conventional DC Casting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<tbody>\n<tr>\n<th>Faktor<\/th>\n<th>Conventional DC Rolling Ingot Casting<\/th>\n<th>LHC Casting<\/th>\n<\/tr>\n<tr>\n<td>Metal level<\/td>\n<td>Lebih tinggi<\/td>\n<td>Lebih rendah<\/td>\n<\/tr>\n<tr>\n<td>Mold interface<\/td>\n<td>Conventional mold arrangement<\/td>\n<td>Graphite-lined interface<\/td>\n<\/tr>\n<tr>\n<td>Lubrication<\/td>\n<td>Relatively higher<\/td>\n<td>Lower lubricant requirement<\/td>\n<\/tr>\n<tr>\n<td>Kualitas permukaan<\/td>\n<td>Depends strongly on casting conditions<\/td>\n<td>Designed for improved surface quality<\/td>\n<\/tr>\n<tr>\n<td>Scalping<\/td>\n<td>May be relatively high<\/td>\n<td>Can be reduced<\/td>\n<\/tr>\n<tr>\n<td>Edge trimming<\/td>\n<td>Depends on ingot quality<\/td>\n<td>Can be reduced<\/td>\n<\/tr>\n<tr>\n<td>Process control<\/td>\n<td>Depends on system<\/td>\n<td>Automated control can be integrated<\/td>\n<\/tr>\n<tr>\n<td>Typical application<\/td>\n<td>Rolling ingots and slabs<\/td>\n<td>High-quality rolling ingots and slabs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"isSelectedEnd\">The actual performance difference depends on alloy, slab dimensions, casting parameters, mold condition, cooling system, and upstream melt quality.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Is_Molten_Aluminum_Quality_Important_for_LHC_Casting\"><\/span>Why Is Molten Aluminum Quality Important for LHC Casting?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">LHC technology can improve the casting conditions, but it cannot compensate for poor molten metal quality.<\/p>\n<p class=\"isSelectedEnd\">Defects introduced before the casting stage may later appear during scalping, hot rolling, cold rolling, or final product inspection.<\/p>\n<p class=\"isSelectedEnd\">Misalnya:<\/p>\n<ul data-spread=\"false\">\n<li>Dissolved hydrogen can contribute to gas-related defects and porosity.<\/li>\n<li>Non-metallic inclusions can affect surface quality and downstream processing.<\/li>\n<li>Poor grain refinement can lead to an unsuitable solidification structure.<\/li>\n<li>Incorrect alloy composition cannot be corrected by the casting mold.<\/li>\n<li>Excessive oxide contamination can increase filtration load and affect melt cleanliness.<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">This is why <strong>melt treatment and LHC casting should be considered as one connected production process<\/strong>, rather than treating the casting machine as an isolated piece of equipment.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Typical_Melt_Treatment_System_for_LHC_Casting\"><\/span>Typical Melt Treatment System for LHC Casting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">A typical process can be arranged as:<\/p>\n<p class=\"isSelectedEnd\"><strong>Melting Furnace \u2192 Holding\/Static Furnace \u2192 Refining \u2192 On-Line Degassing \u2192 Ceramic Foam Filtration \u2192 Grain Refinement \u2192 LHC Mold \u2192 Slab Casting \u2192 Sawing \u2192 Inspection<\/strong><\/p>\n<p class=\"isSelectedEnd\">Depending on the plant, additional filtration or melt-treatment equipment may be installed.<\/p>\n<p class=\"isSelectedEnd\">For example, a production line may use a rotary degassing unit to reduce dissolved hydrogen and a ceramic foam filtration system to remove non-metallic inclusions before the molten aluminum reaches the LHC mold.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Factors_Affect_LHC_Slab_Quality\"><\/span>What Factors Affect LHC Slab Quality?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">LHC casting quality depends on both casting parameters and upstream melt conditions.<\/p>\n<table>\n<tbody>\n<tr>\n<th>Faktor<\/th>\n<th>Effect on slab quality<\/th>\n<\/tr>\n<tr>\n<td>Komposisi paduan<\/td>\n<td>Determines the required metallurgical properties<\/td>\n<\/tr>\n<tr>\n<td>Melt cleanliness<\/td>\n<td>Affects inclusions and downstream surface quality<\/td>\n<\/tr>\n<tr>\n<td>Tingkat hidrogen<\/td>\n<td>Influences gas-related defects and porosity<\/td>\n<\/tr>\n<tr>\n<td>Grain refinement<\/td>\n<td>Influences solidification structure<\/td>\n<\/tr>\n<tr>\n<td>Melt temperature<\/td>\n<td>Affects fluidity and solidification conditions<\/td>\n<\/tr>\n<tr>\n<td>Metal level<\/td>\n<td>Influences mold and solidification behavior<\/td>\n<\/tr>\n<tr>\n<td>Kecepatan pengecoran<\/td>\n<td>Affects heat extraction and solidification<\/td>\n<\/tr>\n<tr>\n<td>Cooling water<\/td>\n<td>Controls solidification intensity<\/td>\n<\/tr>\n<tr>\n<td>Graphite ring condition<\/td>\n<td>Affects mold interface and surface quality<\/td>\n<\/tr>\n<tr>\n<td>Metal flow distribution<\/td>\n<td>Affects uniformity of solidification<\/td>\n<\/tr>\n<tr>\n<td>Automation and control<\/td>\n<td>Improves process repeatability<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"isSelectedEnd\">The correct parameters must be established according to the alloy, slab dimensions, casting equipment, and production requirements.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"LHC_Casting_for_Aluminum_Rolling_Slabs\"><\/span>LHC Casting for Aluminum Rolling Slabs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">LHC casting is particularly relevant to aluminum producers manufacturing slabs for subsequent hot and cold rolling.<\/p>\n<p class=\"isSelectedEnd\">The production chain can be summarized as:<\/p>\n<p class=\"isSelectedEnd\"><strong>Primary aluminum \/ recycled aluminum \u2192 Alloy preparation \u2192 Melting \u2192 Melt treatment \u2192 LHC slab casting \u2192 Scalping and sawing \u2192 Homogenization \u2192 Hot rolling \u2192 Cold rolling \u2192 Finishing<\/strong><\/p>\n<p class=\"isSelectedEnd\">The purpose of the LHC stage is not simply to produce a solid aluminum block. It is to produce a rolling ingot with the surface quality, geometry, cleanliness, and internal structure required by downstream processing.<\/p>\n<p class=\"isSelectedEnd\">A better casting blank can reduce the amount of material removed before rolling and improve the efficiency of the overall production route.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"AdTech_Melt_Treatment_Solutions_for_LHC_Casting_Lines\"><\/span>AdTech Melt Treatment Solutions for LHC Casting Lines<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">AdTech supplies melt-treatment and filtration equipment used upstream of aluminum slab casting.<\/p>\n<p class=\"isSelectedEnd\">Depending on the production line, the equipment can include:<\/p>\n<ul data-spread=\"false\">\n<li>Rotary on-line degassing equipment<\/li>\n<li>Filter busa keramik<\/li>\n<li>CFF filter boxes<\/li>\n<li>Plate-type filtration equipment<\/li>\n<li>Cartridge filtration equipment<\/li>\n<li>Cartridge filter tubes<\/li>\n<li>Aluminum launders and melt-transfer components<\/li>\n<li>Graphite and refractory casting components<\/li>\n<\/ul>\n<p class=\"isSelectedEnd\">The equipment configuration should be selected according to the alloy, melt flow rate, slab dimensions, casting capacity, existing furnace arrangement, and required melt cleanliness.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Information_Is_Needed_to_Select_Equipment_for_an_LHC_Casting_Line\"><\/span>What Information Is Needed to Select Equipment for an LHC Casting Line?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"isSelectedEnd\">For an LHC casting project, the following information is useful when evaluating the upstream melt-treatment and filtration system:<\/p>\n<ol start=\"1\" data-spread=\"false\">\n<li>Aluminum alloy grades<\/li>\n<li>Slab dimensions<\/li>\n<li>Number of strands<\/li>\n<li>Kapasitas pengecoran<\/li>\n<li>Metal flow rate<\/li>\n<li>Melt temperature<\/li>\n<li>Existing furnace configuration<\/li>\n<li>Current degassing method<\/li>\n<li>Current filtration method<\/li>\n<li>Current filter size and PPI<\/li>\n<li>Required melt cleanliness<\/li>\n<li>Existing launder layout<\/li>\n<li>Current casting problems<\/li>\n<\/ol>\n<p>With these parameters, the degassing, filtration, and melt-transfer equipment can be matched to the actual casting line rather than selected independently.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>Pertanyaan yang Sering Diajukan<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<details>\n<summary>1. What does LHC stand for in aluminum casting?<\/summary>\n<p>LHC stands for <strong>Low Head Composite<\/strong>. It is a rolling-ingot casting technology developed for aluminum slab production.<\/p>\n<\/details>\n<details>\n<summary>2. Is LHC casting a type of DC casting?<\/summary>\n<p>Yes. LHC is a rolling-ingot casting technology used within the direct chill casting process, with a low metal head and a specialized graphite-lined mold arrangement.<\/p>\n<\/details>\n<details>\n<summary>3. What is the main difference between LHC and conventional DC casting?<\/summary>\n<p>The main differences include the lower metal level in the mold, graphite-lined mold interface, controlled cooling, and reduced lubrication requirements.<\/p>\n<\/details>\n<details>\n<summary>4. What products can be produced with LHC casting?<\/summary>\n<p>LHC is primarily used for aluminum rolling ingots or slabs that will undergo downstream rolling processes.<\/p>\n<\/details>\n<details>\n<summary>5. Does LHC casting remove hydrogen from molten aluminum?<\/summary>\n<p>No. The LHC mold itself does not remove dissolved hydrogen. Hydrogen reduction is normally handled upstream through a degassing process.<\/p>\n<\/details>\n<details>\n<summary>6. Does the LHC mold remove non-metallic inclusions?<\/summary>\n<p>No. Inclusion removal is primarily performed by molten-metal filtration before the metal enters the mold.<\/p>\n<\/details>\n<details>\n<summary>7. Why is a graphite ring used in LHC casting?<\/summary>\n<p>The graphite ring provides a controlled, smooth interface between the molten aluminum and mold and supports stable casting surface formation.<\/p>\n<\/details>\n<details>\n<summary>8. Can LHC casting reduce scalping?<\/summary>\n<p>Yes. One of the main purposes of LHC technology is to improve ingot quality and reduce material removal during scalping and trimming. The actual reduction depends on the casting system and operating conditions.<\/p>\n<\/details>\n<details>\n<summary>9. How many slabs can an LHC system cast at one time?<\/summary>\n<p>The specific LHC production line described here can cast <strong>2\u20135 slabs simultaneously<\/strong>. The number of strands depends on the casting table configuration.<\/p>\n<\/details>\n<details>\n<summary>10. What melt-treatment equipment is used before LHC casting?<\/summary>\n<p>A typical line may include rotary on-line degassing and ceramic foam filtration, together with grain refinement and other melt-treatment operations required for the alloy and product specification.<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>The LHC (Low Head Composite) casting system is a low-metal-level direct chill (DC) casting technology used to produce aluminum rolling ingots and slabs. By maintaining a relatively low metal level in the mold and using a graphite-lined mold interface with controlled cooling, LHC casting can improve ingot surface quality, reduce surface defects and segregation-related problems, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2603,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-2602","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LHC Casting System used to Produce Aluminum Slab Ingot<\/title>\n<meta name=\"description\" content=\"LHC Casting System is advanced molten aluminum casting technology, uses electrolytic raw aluminum liquid to produce aluminum slab ingots.\" \/>\n<meta name=\"robots\" content=\"index, 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