ASTM A106

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

 Chemical Compositions (max%)

Grade	C	Mn	P	S	Si	Cr	Cu	Mo	Ni	V
A	0.25	0.27-0.93	0.035	0.035	≥0.10	0.40	0.40	0.15	0.40	0.08
B	0.30	0.29-1.06	0.035	0.035	≥0.10	0.40	0.40	0.15	0.40	0.08
C	0.35	0.29-1.06	0.035	0.035	≥0.10	0.40	0.40	0.15	0.40	0.08

Notes:
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 Requirements	Grade A		Grade B		Grade 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]
	Longitudinal	Transverse	Longitudinal	Transverse	Longitudinal	Transverse
Elongation in 2 in. [50 mm], min, %:
Basic minimum elongation transverse strip tests, and for all small sizes tested in full section	35	25	30	16.5	30	16.5
When standard round 2-in. [50-mm] gage length test specimen is used	28	20	22	12	20	12
For longitudinal strip tests	A		A		A
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 made		1.25		1.00		1.00

Note:

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

e = 625 000A^0.2 / U ^0.9 for SI units, and
e = 1940A^0.2 / U ^0.9 for inch-pound units,

where:

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].