alloy steel pipe: 1.ISO9001 and API certificates 2.OD:10-480MM,WT:1-25MM 3.High quality,Competitive price 4.ISO9001:2000 alloy steel pipe: 1.ISO9001 and API certificates 2.Variety sizes, large stocks3.High quality 4.Competitive price SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purpose GB/T8162-199910, 20, 35, 45, 40Mn2, 45Mn2, 27SiMn, 20Cr, 40Cr, ...