Precautions for stainless steel materials

　　Now, we often see the import of stainless steel standard ASME standard SA240, ASTM standard A240 and Japan JIS standard SUS; often used for grades 304,304 L, 316L and so on. The following is a 304 example to illustrate their representation: JIS standard material, that is relatively simple, that is, SUS304 this expression; ASME and ASTM that there are several: SA240-304, SA240TP304, A240-304, A240TP304, in fact, Middle plus - plus the same meaning as TP. We mentioned that there are 304L in front of the material,24 inch large stainless steel pipe end cap which L is the suffix, that low carbon content; often can see H, that the higher carbon content, mainly in the high temperature of the occasion; There is N, that increase the element N, to improve the intensity. In some cases, we can see later: 2B, No. 1 and other suffixes, these suffixes indicate the surface state of the material; 2B means hot rolled and cold rolled, the surface is better, to meet the requirements of the steel plate; 2D said Hot rolled and cold rolled, the surface of the general steel; No. 1 that hot-rolled surface.