» Pipe & Tube » ASTM A192/ ASME SA-192 Boiler Tubes

ASTM A192/ ASME SA-192 Boiler Tubes

August 7, 2020

Standard, Size & Wall Thickness

A superheater made of ASTM A192 tubes

A superheater made of ASTM A192 carbon steel seamless tubes, at a job site of a chemical plant in Lithuania.

ASTM A192, identical with ASME SA-192, is the standard specification covering minimum-wall-thickness seamless carbon steel boiler and superheater tubes for high pressure service. The tubing sizes and thicknesses usually furnished to ASTM A192 are 1/2″ to 7″ [12.7 mm to 177.8 mm] outside diameter and 0.085″ to 1.000″ [2.2 mm 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.

Manufacture & Heat Treatment

Seamless tube hot-rolling line

A glance at the hot-rolling line of Baotou Steel, one of China’s prominent state-owned pipe mills. A Φ50.8 mm tube made of ASTM A192 steel is fed through the triple-roller rolling facility.

The ASTM A192 boiler tubes/ superheater tubes shall be made by the seamless process and shall be either hot-finished or cold-finished. Hot-finished tubes need not be heat treated. Cold-finished tube shall be heat treated after the final cold-finishing at a temperature of 1200°F [650°C] or higher.

Chemical Composition Requirements

ElementContent, %
*All values shall be based on heat analysis.

Mechanical Properties

Mechanical Property Requirements
T.S. min
ksi [MPa]
47 [325]
Y.S. min
ksi [MPa]
26 [180]
El. in 2"
min, %
Brinell Hardness
max. HBW
Rockwell Hardness,
max. HRBW
*T.S.: tensile strength; *Y.S.: yield strength; *El.: elongation.
*The Brinell Hardness number applies to ASTM A192 tubes 0.200″ [5.1 mm] and over in wall thickness.
*The Rockwell Hardness number applies to ASTM A192 tubes less than 0.200″ [5.1 mm] in wall thickness.
*Mechanical properties don’t apply to tubing smaller than 1/8″ [3.2 mm] inside diameter or 0.015″ [0.4 mm] thickness.

Mechanical Tests Required

Flattening test, flaring test, hardness test, hydrostatic test, and tension test.

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