... oil piling, chemicals, water supply , transporting natural gas, petrol , piling, building bridge, steel structures,Technical standard:1) ASTM A532) ASTM A1063) API 5L4)API ... 1629 ST45,DIN1626 ST37,5>10#,20#,37Mn5,36Mn2VOther steel grade is available as per clients requirements.Ordinary Sizes: ... Date:2010-2-21 2:47:44 steel line pipe,API Spec 5L , API Spec 5CT, API Spec 5B, EN10217, GB/T9711.1 and ...