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Welding screen

Manganese steel refers to cast steel with a carbon mass fraction of 0.9% to 1.3% and manganese 11% to 14%. When this steel is heated in the range of 1000 to 1100 ° C, a single austenite structure can be obtained, and then quickly cooled and quenched in water (water toughening treatment) to maintain a single-phase austenite state. Austenitic high manganese steel has high toughness and is a very strong non-magnetic alloy. Under the impact load, the surface layer will undergo work hardening and high wear resistance. However, cutting is difficult and is limited to Used for castings, widely used to manufacture parts that require high abrasion resistance and withstand impact loads, the grade is ZGMn

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Manganese steel refers to cast steel with a carbon mass fraction of 0.9% to 1.3% and manganese 11% to 14%.

When this steel is heated in the range of 1000 to 1100 ° C, a single austenite structure can be obtained, and then quickly cooled and quenched in water (water toughening treatment) to maintain a single-phase austenite state. Austenitic high manganese steel has high toughness and is a very strong non-magnetic alloy. Under the impact load, the surface layer will undergo work hardening and high wear resistance. However, cutting is difficult and is limited to Castings are widely used to manufacture parts that require high abrasion resistance and withstand impact loads. The grade is ZGMn13. For the chemical composition, see Table 30. Table 30 Chemical composition (mass fraction) (%) of Mn13 steel

The welding screen of Mn13 high manganese steel is poor. The main problems when welding are:

Precipitation of carbides in the heat-affected zone After high-manganese steel is subjected to water toughening at 1050 ° C, all carbon is dissolved in austenite, and it has a single-phase austenite structure at room temperature, which has good toughness. At ℃, carbon will precipitate carbides along the grain boundaries, which greatly reduces the toughness of the material. Therefore, after welding, carbides will precipitate to varying degrees in a section of the heat affected zone, which not only loses toughness and becomes brittle, but also Will reduce abrasion resistance and impact toughness. The solution is to accelerate the cooling rate of the weldment during welding and shorten the residence time at high temperature to reduce the precipitation of carbides.


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