Alloy liner FAQ: grades, hardness, applications, and ordering details

High chromium alloy liners protect working surfaces in equipment exposed to abrasion and impact. They are used as inner liners for hammer crushers and ball mills, and can also be supplied for grinding machines and other wear components. This FAQ covers the practical questions buyers should settle before requesting a quotation from Shijiazhuang Chengda Wear Resistant Materials Co.,Ltd.\n\n## What equipment can use an alloy liner?\n\nHigh chromium alloy liners are used inside hammer crushers and ball mills. They are also used in grinding machines and as wear components such as guide rails and guard plates. The right application depends on the equipment layout and the type of abrasion or impact at the working surface.\n\nFor a ball mill replacement, picture the liner as the wear-facing part inside the shell. For a hammer crusher, the liner protects areas exposed to material impact. Before ordering, send the equipment type, liner position, available drawing, and installation dimensions so the supplier can match the part to the machine.\n\n## Which material grades are available?\n\nThe product range includes medium chromium medium carbon, medium carbon low alloy, low carbon high alloy, chromium molybdenum nickel alloy steel, 90 chrome alloy steel, modified high manganese steel, high chromium cast iron, and high chromium cast steel. Listed designations include ZG30Cr5MoRE, ZG40Cr5MoRE, ZG40CrMoNiRE, ZG20Cr9NiMo, ZG45Cr3NiMoMnRE, ZG90Cr6MoMn, ZGMn13Cr2, KmTBCr15Mo2, KmTBCr20Mo2, KmTBCr26, ZGCr12SiMn-GT, and ZGCr15SiMn-GT.\n\nHigh chromium cast iron grades include KmTBCr15Mo2, KmTBCr20Mo2, and KmTBCr26. The listed chromium ranges for these three grades are 13 to 18%, 18 to 22%, and 23 to 28%, respectively. Grade selection should follow the equipment position and the balance between wear exposure and impact.\n\n## What hardness and impact information should buyers compare?\n\nHardness and impact resistance are both relevant to an alloy liner. The listed mechanical properties include HRC values from at least 40 to at least 50 for the grades shown in the detailed table. For example, ZG30Cr5MoRE is listed at a minimum of 45 HRC and ZG45Cr3NiMoMnRE at a minimum of 50 HRC. The same table lists impact values from at least 7 to at least 40 J/cm² for the grades with complete mechanical-property entries.\n\nA separate product range describes hardness from HRC 40 to HRC 60+ and impact values from at least 3 to at least 80 J/cm², depending on grade. These figures should therefore be matched to the selected grade, not treated as one value for every alloy liner. Include the current liner grade or material requirement in your inquiry.\n\n## What information should be included in an alloy liner inquiry?\n\nSend the machine type, installation position, part drawing or measured dimensions, quantity, current liner material or grade, and the operating conditions that affect wear and impact. If you are replacing an existing liner, include photographs and the old part designation where possible.\n\nThe available grades use different chemical compositions and microstructures, including martensite, bainite, carbide, ferrite, and austenite combinations. A complete inquiry lets the supplier connect the requested dimensions with a suitable material grade and the required hardness or impact target. Ask for the proposed designation, chemical composition, hardness, impact value, and microstructure with the quotation so the order can be checked against the equipment requirement.