Dongguan Hanlin Metal Materials Business Department

Manganese steel is a high-strength manganese-resistant steel that is mainly used to withstand harsh working conditions such as impact, extrusion, and material wear. The damage is mainly caused by wear and consumption, with partial fracture and deformation. Wear is divided into three types: friction wear in which the surfaces of metal components are in contact with each other and move, abrasive wear in which other metal or non-metallic materials hit the metal surface, and erosion wear caused by contact between flowing gas or liquid and metal. The wear resistance of wear-resistant steel depends on the material itself, and wear-resistant steel shows different wear resistance under different working conditions. Both the material itself and the working conditions determine its wear resistance. Cast wear-resistant steel and wear-resistant steel are mainly austenitic manganese steel. Under certain conditions, low-alloy steel that has been appropriately heat-treated also has good results. Graphite steel is used for lubricating friction conditions. Wear-resistant high manganese steel is especially suitable for impact abrasive wear and high-stress grinding abrasive wear conditions. It is often used to manufacture ball mill linings, hammer crusher heads, jaw crusher jaw plates, cone crusher rolling mortar walls, and crushing Impact-resistant and wear-resistant castings such as excavator bucket teeth and bucket walls, railway switches, track pads of tractors and tanks, etc. High manganese steel is also used in: bulletproof steel plates, safe steel plates, etc. High manganese steel is a typical anti-wear steel, and its as-cast structure is austenite plus carbides. After the left and right water quenching treatment, the structure transforms into a single austenite or austenite plus a small amount of carbides, and the toughness is improved, so it is called water toughening treatment characteristics
The most important feature of high manganese steel is that it can withstand strong impact, Under extrusion conditions, work hardening occurs rapidly in the surface layer, allowing the core to maintain good toughness and plasticity of austenite while the hardened layer has good wear resistance. This is unmatched by other materials. However, the wear resistance of high manganese steel only shows its superiority under conditions sufficient to form work hardening. In other cases, it is very poor. Typical wear-resistant high manganese steel is based on 3 steels and increases the amount of manganese, which improves the stability of austenite and prevents the precipitation of carbides, thereby improving the strength and plasticity of the steel, improving the work hardening ability and Wear resistance. For example, the service life of railway forks used in the north is improved compared to 3~. Due to the work hardening phenomenon of high manganese steel, processing of castings should be avoided as much as possible. The holes and slots in the casting should be cast as much as possible. But processing high manganese steel is not completely impossible. Tool dressing can be carried out after one feed. Unavoidable processing should be enlarged during the casting process design so that the processing feed can avoid the work-hardened layer. When high manganese steel is reheated, there is a brittle temperature range where carbides precipitate, and as-cast high manganese steel has network carbides and casting stress. Therefore, the welding performance is very poor. For high manganese steel castings, risers should be cut or defects should be repaired by welding after water toughening treatment, and they should be cooled quickly after welding. In order to eliminate or reduce the heat affected zone as much as possible, use small current, discontinuous welding, or water cooling while welding. Welding rods are made of high manganese steel or austenitic stainless steel. If work-hardened layer exists, it should be removed before welding.