There are three fundamental differences between 304 stainless steel and carbon steel

First, 304 stainless steel has work hardening during cold working. For example, it has anisotropy during bending, that is, the transverse and longitudinal properties are different. The strength increased by cold working can be used, but if the bending area is small compared with the total area and this increase is ignored, the increased strength can improve the safety factor to a certain extent.

Second, the shape of stress / strain curve is different. The elastic limit of 304 stainless steel is about 50% of the yield stress. In terms of the minimum value specified in the standard, the yield stress value is lower than that of medium carbon steel.

Third, 304 stainless steel has no yield point, which is usually represented by ó 0.2. The yield stress is considered as the equivalent value.

304 stainless steel pipe is a stainless steel with austenitic structure at room temperature. When the steel contains about 18% Cr, 8% ~ 10% Ni and 0.1% C, it has stable austenite structure. Austenitic chromium nickel stainless steel includes famous 18Cr-8Ni steel and high Cr Ni series steel developed by increasing Cr and Ni content and adding Mo, Cu, Si, Nb, Ti and other elements.

304 austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low. It can not be strengthened by phase transformation, but only by cold working. If s, CA, Se, TE and other elements are added, it has good free cutting performance. In addition to being resistant to oxidizing acid medium corrosion, this kind of steel can also be resistant to sulfuric acid, phosphoric acid, formic acid, acetic acid, urea, etc. if it contains Mo, Cu and other elements