Standard:API 5L, API 5CT, ASTM A106/A53, ASTM A519, JIS G 3441, JIS G3444, JIS G3445 DIN ... SRL, DRL Steel Grade: API 5L: GR B, X42, X46, X56, X60, X65, X70 ASTM A53/A106: GR A, GR B, GR C ... ASME SA106: GR.A, GR.B, GR.C ASME SA192: ... , economizer, super heater, boiler and heat exchanger with seamless steel tubes, and to transport liquid, gas, oil etc.