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How to Distinguish 304 Stainless Steel Pipe is Cold or Hot Rolled

Nowadays, the types of stainless steel pipes on the market can be described as dazzling. How can we distinguish whether 304 stainless steel welded pipes are cold-rolled or hot-rolled? What is the difference in performance?
The cold rolling and hot rolling of 304 stainless steel will affect the microstructure and properties of the steel. The rolling of steel is mainly based on hot rolling, and the cold rolling is only used to produce small steel and thin plates.
The difference is as follows:
1. Cold-formed 304 stainless steel allows local buckling of the cross-section so that the post-buckling bearing capacity can be fully utilized; hot-rolled steel does not allow local buckling of the cross-section.
2. The causes of residual stress in hot-rolled steel and cold-rolled 304 stainless steel are different, so the distribution on the cross-section is also very different. The residual stress distribution on the cold-formed thin-wall steel section is curved, while the residual stress distribution on the hot-section steel or welded 304 stainless steel section is thin-film type.
3. The free torsional stiffness of hot-rolled 304 stainless steel is higher than that of cold-rolled 304 stainless steel. Therefore, the hot-rolled 304 stainless steel pipe has better torsional performance than the cold-rolled 304 stainless steel pipe.
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