The seamless stainless steel pipes has a solution treatment temperature of 1080-1100 ° C during the operation, and the cooling method is water cooling or air cooling. The intermediate annealing temperature of cold working is mostly at 850-970 ° C, and it is water-cooled after being kept for a certain period of time. After the solution treatment, the microstructure of the steel is an austenite structure, and sometimes a small amount of ferrite is present.
The seamless stainless steel pipes suppresses the precipitation of carbides during welding. It can be welded by using the method. The arc welding during the operation is performed. The 304 stainless steel with a thin section size of 0.04%-0.06% carbon can be used. After welding, there is no tendency to cause intergranular corrosion. For thick section feet, to maintain the intergranular corrosion resistance after welding, post-weld heat treatment is required. If it is not heat treated, it should be changed to 304L stainless steel or stabilized austenitic stainless steel.
Seamless stainless steel pipes is often used for cold forming operations during application. Its cold forming performance is an important technical indicator to measure the smooth formation and yield. The cold forming factors affecting 304 stainless steel are many and complicated. In terms of its metallurgical factors, it is mainly the composition of steel, that is, the ratio of chromium equivalent to nickel equivalent, and the elongation in conventional tensile properties is an important indicator. In order to obtain good cold forming properties, the ratio of chromium equivalent to nickel equivalent in the steel should be controlled to an appropriate range.
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