1. The phase proportion needs to be controlled. The appropriate proportion is half of the ferrite phase and half of the martensite phase. The proportion of a certain phase cannot exceed 65%, so as to ensure an ideal sorting effect. . If the proportion of the two phases is unbalanced, for example, the total number of ferrite phases is too much, it is easy to form single-phase electric ferrite in the welding HAZ, which is more sensitive to intergranular corrosion cracking in some materials.

2. It is necessary to understand the distribution change standard. The prime DIN1.4301 stainless steel round bar diameter specification table understands the TTT and CCT change curves of each steel grade. This is also a suitable guide for formulating the heat treatment process of duplex steel, heat setting and other processing processes. important.

3. The continuous use temperature range of 431 stainless steel rods is -50~250℃. The lower value lies in the brittleness change temperature of steel. The limit is limited by the brittleness of 475℃, and the limit temperature cannot exceed 300℃.

4. Rapid cooling is required after aging treatment. Slow cooling will cause the separation of the brittle phase, which will subsequently reduce the ductility of the steel and reduce the corrosion resistance of the part.

5. The lower temperature of heat treatment and hot forming of high chromium molybdenum stainless steel plates cannot be less than 950°C to prevent surface cracks caused by the separation of brittle phases during the production process.

6. Do not use the 650-800°C stress reduction treatment commonly used in 1cr17 stainless steel rods, and generally use heat treatment, tempering and annealing. Regarding the need for overall 600-650°C response treatment after spray welding on the surface of high-alloy steel, the ductility and corrosion resistance provided by the separation of brittle phases and the reduction of partial corrosion resistance must be taken into consideration. Minimize heating time within this temperature range. The heat treatment process issues of high alloy steel and two-phase stainless steel composite plates also need to be taken into consideration.

7. It is necessary to understand the welding standard of prime DIN1.4301 stainless steel round bar. It is not allowed to use stainless steel plate for welding. The failure of some equipment is often related to welding. The focus is on the control of linear kinetic energy and solid layer temperature. Proper selection of welding materials is also important.