The so-called difference between stainless steel seamless pipe and seamless carbon steel pipe mainly refers to the difference in design rules between stainless steel and carbon steel, which means that the design rules of these two types of stainless steel pipes cannot be universal. These differences are summarized as follows:
The design rules for stainless steel cannot be used for carbon steel because there are three fundamental differences between stainless steel and carbon steel.
1. Stainless steel undergoes work hardening during cold working, for example, it has anisotropy during bending, that is, the transverse and longitudinal properties are different.
The increased strength by cold working can be used, but if the bending area is small compared to the total area and the increase is neglected, the increased strength can improve the safety factor to a certain extent.
2. The shape of the stress/strain curve is different. The elastic limit of stainless steel is about 50% of the yield stress. As far as the minimum value specified in the standard is concerned, the yield stress value is lower than that of medium carbon steel.
3. Stainless steel has no yield point, usually expressed as ó0.2, the yield stress is considered to be an equivalent value.