ASTM A106 – Seamless Carbon Steel Pipe for High-Temperature Service

 Chemical Compositions (max%)


1) For each reduction of 0.01 % below the specified C maximum, an increase of 0.06 % Mn above the specified maximum will be permitted up to a maximum of 1.35 %.
2) The sum of Cu, Ni, Cr, Mo and V shall not exceed 1.00%.

Tensile Requirements

Tensile RequirementsGrade AGrade BGrade C
Tensile strength, min, psi [MPa]48 000 [330]60 000 [415]70 000 [485]
Yield strength, min, psi [MPa]30 000 [205]35 000 [240]40 000 [275]
Elongation in 2 in. [50 mm], min, %:
Basic minimum elongation transverse strip tests, and for all small sizes tested in full section35253016.53016.5
When standard round 2-in. [50-mm] gage length test specimen is used282022122012
For longitudinal strip testsAAA
For transverse strip tests, a deduction for each 1.32-in. [0.8-mm] decrease in wall thickness below 5⁄16 in. [7.9 mm] from the basic minimum elongation of the following percentage shall be made1.251.001.00


The minimum elongation in 2 in. [50 mm] shall be determined by the following equation:

e = 625 000A0.2 / U 0.9 for SI units, and
e = 1940A0.2 / U 0.9 for inch-pound units,


e = minimum elongation in 2 in. [50 mm], %, rounded to the nearest 0.5 %,
A = cross-sectional area of the tension test specimen, in.2 [mm2], based upon specified outside diameter or nominal specimen width and
specified wall thickness,rounded to the nearest 0.01 in.2 [1 mm2]. (If the area thus calculated is equal to or greater than 0.75 in.2 [500 mm2], then the value 0.75 in.2 [500 mm2] shall be used.), and
U = specified tensile strength, psi [MPa].