0Cr15Ni7Mo2Al(PH15–7Mo)The hot working temperature range for process performance a hot working steel is 1160-900 ℃. The cold work hardening tendency of cold worked steel is relatively high. When cold rolling, cold drawing or stamping, it is advisable to adopt the operation specification of large reduction and few passes, and appropriate solution treatment should be carried out. Cold processing is usually carried out in a solid solution state. When using RH or TH system for heat treatment, the parts are usually processed in a solid solution state, and then the heat treatment process after solid solution treatment is continued according to the RH or TH system procedure. When processing according to the RH system, if the martensitic transformation is not sufficient after cold treatment, the adjustment temperature can be appropriately lowered to increase Ms, but it should not be lower than 900 ℃. Products delivered in a cold working state only require simple aging by the factory (CH system), which is generally applicable to elastic components. Whether it is cold treatment or aging treatment, it can be repeated 1-2 times according to the actual situation, and the repeated aging temperature cannot be lower than the initial aging temperature. This steel can be welded by arc welding and resistance welding, using gas shielded welding. Welding is usually carried out in a solid solution state, and full heat treatment is recommended after welding. The welding efficiency can reach over 90%. If welding is carried out in the final heat treatment state without re heat treatment after welding, the tensile strength of the welded joint will decrease significantly. The performance of spot welding, roll welding, and argon arc welding is shown in Tables 1 to 3. Table 1 Spot Welding Performance of 0Cr15Ni7Mo2Al

pour：Pre weld heat treatment is1050℃Air cooling+950℃空冷+(–70℃)2h+450℃1hAir cooling，welding。 The post weld heat treatment is 1050 ℃ air cooling, followed by 950 ℃ air cooling+(-70 ℃) 2h+450 ℃ 1h air cooling after welding. The material thickness is 1.3mm. Table 2 Roll welding performance of 0Cr15Ni7Mo2Al

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