250NB SCH10 ASTM A 53 GR B Black Carbon Steel ERW Pipe, 600NB SCH10 ASTM A 53 GR. B Black Carbon Steel Welded Pipe, 800NB SCH10 ASTM A 53 GR. B Black Carbon Steel Welded Pipe, 300NB SCH10 ASTM A 53 GR. B Black Carbon Steel Welded Pipe, 600NB SCH10 ASTM A 53 GR B Black Carbon Steel Welded Pipe