Black steel pipe 1,standard:ASTM,DIN,BS,JIS 2,material: ... /2-24 4.Delibery time:7-30days black welded steel pipes/Carbon steel pipe Product Name black welded steel pipesSpecificationOut diameter245-457mmWall thickness4 ... /A53(A,B)TechniqueERW/hot rolled/cold rolledSurface treatmentOiled or black painted or as clients' requirementApplicationOil,gas,water and other liquid ...