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 000A0.2 / U 0.9 for SI units, and
e = 1940A0.2 / 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].