ASTM A192 / A192M is the standard applicable to seamless carbon steel boiler tubes for high-pressure service ASTM A192 Seamless steel tubes sizes and thicknesses usually furnished to this specification are 1⁄2 in. to 7 in. [12.7 to 177.8 mm] outside diameter and 0.085 to 1.000 in. [2.2 to 25.4 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification. ASTM A192 Seamless steel tubes mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] inside diameter or 0.015 in. [0.4 mm] thickness. ASTM A192 Referenced Documents: ASTM A450 / A450M Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes Standard: ASTM A192 / ASME SA 192 Description Name: ASME SA 192 / ASTM A192 boiler pipes; A192 pipes; A192 carbon steel tube; ASTM A192 seamless tubing; ASTM A192 carbon steel pipe; SA192 SEAMLESS PIPE; ...