1.stainless steel pipe 2.O.D.:6mm~2220mm 3.W.T.:0. ... A192, A213, A333, DIN1629, DIN17175, Russian standard, Franch stan.)2. stainless steel pipe (304, 316, 316L, 304L, 321, 410, 444, 430)3. alloy ... ↓ ---Certificate issued by China chamber of Commerce↓---ISO 9001↓-Equipment and Detector-Process-Application-Other Leading steel pipe---carbon steel pipe↓---Anti-corrosion steel pipe↓ ---welded steel pipe↓