... ,JIS and so onOut Diameter21.3mm—457mm (1/2”-22”)Wall Thickness2mm-70mmGrade10#,20#,45#,16Mn,27SiMn,Q235,ST42,ST52,,A106 ... ,ChinaTechniqueSeamless,welded UsageLow and middle pressure fluid transportation pipeline Casing Tube Boiler Pipe Pertroleunm and natural gas industry Chemistry industry Electric ... contact us. We look forward to working with you big wall seamless steel pipes