ASTM A106 is the standard specification for seamless carbon steel pipe applied for high temperature and high-pressure services. ASTM A106 Grade C Pipe features higher tensile strength and yield strength compared to Grade B, making it ideal for rigorous industrial scenarios. It is widely used in power plants, industrial boilers, petrochemical plants, oil and gas refineries, marine engineering and high-pressure process piping systems for transporting hot and cold liquids and gases under extreme temperature and pressure conditions.
ASTM A106 Grade C Chemical Composition
| Element |
C (max) |
Mn |
P (max) |
S (max) |
Si (min) |
Cr (max) |
Cu (max) |
Mo (max) |
Ni (max) |
V (max) |
| ASTM A106 Grade C |
0.35 |
0.29-1.06 |
0.035 |
0.035 |
0.1 |
0.4 |
0.4 |
0.15 |
0.4 |
0.08 |
ASTM A106 Grade C Testing Requirements
| Test |
NPS |
On One Length from Each Lot of |
| Tensile Test |
5 and smaller |
<= 400 |
| Tensile Test |
6 and larger |
<= 200 |
| Bending Test |
2 and smaller |
<= 400 |
| Flattening Test |
2 through 5 |
<= 400 |
| Flattening Test |
6 and over |
<= 200 |
Hydrostatic Testing Requirements
Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum pressures are not to exceed 2,500 psi for NPS 3 and under, and 2,800 psi for the larger sizes. Pressure is maintained for no less than 5 seconds. All A106 Grade C seamless pipes strictly comply with this standard to ensure stable performance in high-pressure and high-temperature working conditions.
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