In the air or chemical corrosion medium can resist a high-alloy steel 316l stainless steel pipe corrosion, in order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% of chromium. 304 stainless steel chemical composition: Specifications C Si Mn PS Cr Ni (nickel) Mo SUS304 ≤0.08 ≤1.00 ≤2.00 ≤0.05 ≤0.03 18.00-20.00 8.25 ~ 10.50. 4-1 of Classification: ① national standard GB ② industry standard YB ③ ④ local standards enterprise standard Q / CB 4-2 Category: ① ② product standard packaging standards ③ ④ standard method based on the standard 4-3 standard level (three points) : Y class: the international advanced level class I: Class H common international level: the advanced level 4-4 GB GB1220-84 stainless steel rods (Class I) GB4241-84 stainless steel plate welded Park (H level) GB4356-84 not Rust Pad Park (I-level) GB1270-80 stainless steel tubing (I Class) GB12771-91 stainless steel pipe (Y class) GB3280-84 stainless steel cold plate (I grade) GB4237-84 stainless steel hot plate (I grade) GB4239-91 stainless steel cold strip (Class I) stainless steel pipe fittings, stainless steel pipe, Billion-commerce provided by Tianjin Bao Bao Jie Shengda Trading Company. Bao Jie Tianjin Shengda Trading Company (www.sdbjsm.com) strong, credible, in Tianjin's daily hardware industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shengda treasure-commerce and you hand into the brilliant, for a better future!