High manganese steel workpiece

Manganese steel is a high-strength wear-resistant steel, mainly used to withstand harsh working conditions such as impact, compression, and material wear. The main form of failure is wear and tear, with partial fracture and deformation. Wear can be divided into three types: frictional wear caused by the contact and movement between the surfaces of metal components; Abrasive wear caused by the impact of other metal or non-metal materials on metal surfaces and erosion wear caused by the contact of flowing gases or liquids with metals. The wear resistance of wear-resistant steel depends on the material itself, and wear-resistant steel exhibits different wear resistance under different working conditions. Only the material itself and working conditions can determine its wear resistance.

Austenitic manganese steel is mainly used for casting wear-resistant steel and wear-resistant steel, and low-alloy steel with appropriate heat treatment under certain conditions also has good effects. Graphite steel is used for lubricating friction working conditions.

Wear resistant high manganese steel is particularly suitable for impact abrasive and high stress crushing abrasive wear conditions. It is commonly used in the manufacture of impact resistant and wear-resistant castings such as ball mill liners, hammer heads for hammer crushers, jaw plates for jaw crushers, rolling mill and crushing walls for cone crushers, bucket teeth and walls for excavators, railway switches, and track plates for tractors and tanks. High manganese steel is also used for bulletproof steel plates, safe steel plates, etc.

High manganese steel is a typical wear-resistant steel, with a cast microstructure of austenite and carbides. After water quenching at around 1000 ° C, the structure transforms into a single austenite or austenite with a small amount of carbides, and the toughness is actually improved. Therefore, it is called water toughening treatment.

The most important characteristic of high manganese steel is that under strong impact and extrusion conditions, the surface layer rapidly undergoes work hardening, allowing it to maintain good toughness and plasticity of austenite in the core while the hardened layer has good wear resistance. This is beyond the reach of other materials. However, the wear resistance of high manganese steel only shows its superiority when it has sufficient conditions to form work hardening, and is poor in other cases.

The typical Mn17 wear-resistant high manganese steel is based on Mn13 steel with an increase in manganese content, which improves the stability of austenite, prevents the precipitation of carbides, and thereby enhances the strength and plasticity of the steel, as well as the work hardening ability and wear resistance of the steel. For example, the service life of ZGMn18 railway forks used in the north is 20% -25% longer than ZGMn13.

Manganese steel has a very peculiar and interesting temperament: if 2.5-3.5% manganese is added to steel, the resulting low manganese steel is as brittle as glass, breaking at the slightest tap. However, if more than 13% manganese is added to make high manganese steel, it becomes both hard and tough