... seamless steel pipe 2) Standard:GB,ASTM, DIN,JIS, 3) Material:10# ,20# ,35#, 15CrMo,13CrMo44,and so on. Our company is ... specialized in the production of steel pipes that our products are widely used ... !Contact Details:ShangHai hanqi metallic material Co.,LtdADD:Tianjin office 2020 room,sunny zone,central north road,Tanggu Tianjin China seamless steel pipe