ASTM A53 Seamless Steel tube Grade:ASTM A53 Gr.A/B WT:2-60mm OD:33.4-508mm Length:3-12 ... .Price advantage:As we buy more than 30000 tons from mill as agent,we get a lowest price on the market. 2 ... pipe is qualified with ASTM A53/A106/API 5L Gr.B or any steel grade you need.No false or defect ... : 2mm-60mm 3. Steel Grade:A53 (A,B),A106(A,B),API 5L Gr.B,X42,X52,X60,st42,st37,st52,SS400,SS490 ...