SEAMLESS STEEL PIPE Size: Outer Diameter: 21.3 - 762mm Wall Thickness: 1.25 - 63.5mm Length: Random Length, Fixed Length, SRL, DRL Usage: Applicable to the general structure, mechanical structure, water wall panel, economizer, super heater, boiler and heat exchanger with seamless steel tubes, and to transport liquid, gas, oil etc. Quality Standard: ASTM A106: Standard Specification for Seamless ...