Detailed Product Description Black Seamless Steel Pipes and tubes,ASTM A106.A53.API 5L Gr.B1.seamless steel pipe ASTM A53 GR.B,Size ... "-36"2.High-temperature operation samless steel pipe ASTM A106 GR.B,Size:1/4"-36"3.Linepipe API 5L,Grade ... ,X52,Size:1/4-284.ASTM A106/A53/API 5L GR.B, B,1/4-28,13.7-711.2mm5.ASTM ... A179,3/416.-40°-101°ASTM A333,:GR.A,GR.1,GR.6,GR.7,GR.3,:1/4-28,13.7-711.2mm7 ...