... :Oiled or black painted to prevent rust.4)Usage:For conveying gas,water,and oil in both the oil and natrual ... /T 5040 Spiral submerged arc-welded steel pipe piles2>CJ/T 3022 Spiral submerged-arc welded steel pipe for municipal heat supplySteel Grade1>GB ... , Q215, Q235, Q275, Q295, Q345, 08F, 08, 08AL, 08F, 10F, 10, HG5, DF08 SPHC, M82>BS 1387, EN10217, EN 10219 S185 ...