seamless carbon steel pipe 1)standard:GB,ASTM ,DIN, 2)grade:10#,20#,45#,16Mn 3)od :2-316mm ... thickness:1.2-12mm SPECIFICATIONS1)spiral wels steel pipe as per ... 10#20#,45#,16Mn 2)Standard & material :GB,ASTM ... Alibaba id : cn220117360 Hotmail id: lctrgg_exporting ERW 20# SCH30 seamless carbon steel pipe