... JIS ASTM 3.thickness:2-60mm 4.OD:20-667mm 5.material:15-45#,etc. we can supply seamless steel ... 2~60mm(4) Standard ; a.ASTM A106 GR B , ASTM A53 GR B, ASTM A178 GR C, , J55 b.SAE1020,SAE1045 c.JIS ... -8, DIN ST 42-2, st 45-4, st52.4 (5) Usage: boiler use, water transport, building, machinery, traffic, aviation, ... will be lower.(10) Tolerate: OD +/-1%Thickness +12.5% / -10% length +/-2 cm ASTM A53/API-5L ...