1. steel pipe factory 2. ISO9001 standards 3. min order 1 ton ... .Q235 material etc 5. used for cylinder etc 304 erw steel pipes A: Round pipe diameter: 20-185MM, thickness: 1.5-15MM ... to customer requirementsD: Steel grade: 20#, 45#, Q195, Q235, 45MN,65MNE: Conforms to international standards, like: ASTM A53, ASTM A500, ASTM A513, ASTM A312, BS1387 ...