56 Inch OD High Pressure Boiler Tube , Alloy Steel Pipe P91
Material Long Lifespan
It shall be noted that, ASTM A335 Grade P91 is a good grade applied
for high pressure boiler. And P91 pipe is ideal when it comes to
bending, flanging or when it is used in similar operations such as
welding. The material of steel should stick to the composition of
chemicals, tensile property and the requirements of hardness.
ASTM A335 P91 alloy steel pipe and high pressure boiler pipes are
the two variants available and the range is dependent based on the
size, which is solely based on the usage. The length of the pipe
will be subject to hydrostatic test and there will also be a
non-destructive examination based on the specifications.
As a result, The chrome moly pipe finds high usage in power
generation industry and petrochemical industry owing to its
resistance to corrosion, tensile strength, strength for high
temperature owing to its cost-effectiveness.
1. Standards
ASTM A106 ——Standard Specification for Seamless Carbon Steel Pipe
for High-Temperature Service
ASTM A335 ——Standard Specification for Seamless Ferritic
Alloy-Steel Pipe for High-Temperature Service
2. Application
For the high-pressure boiler and steam pipes, and the petrochemical
industry pipes;
Power plant; Chemical Fertilizer; Petrochemicals; Offshore Oils;
Gas Productions; Refineries and etc.
3. Steel pipes No. of main production:
ASTM A335 Grade P5, P9, P11, P12, P22, P91, P92
ASTM A106 Grade B, C
4. Dimensional Tolerance
| Pipe types | OD (mm) | Tolerance | WT (mm) | Tolerance |
| High Pressure Boiler Tube | 219~457 | ±1.0％ | ≤20 | -10% ~ +12.5% |
| 20~40 | -10% +10% |
| 457~1422 | ±0.9％ | ＞40~70 | -7％, +9％ |
| ＞70~20 | -6％, +8％ |
5. Chemical Composition:
| High Pressure Boiler Tube Chemical Requirements |
| Standard | Grade | UNS Designation | Composition, % |
| C | Mn | P | S | Si | Cr | Mo | Ni | V | Others |
| ASTM A335 | P5 | K41545 | 0.15max | 0.30-0.60 | 0.025 | 0.025 | 0.50max | 4.00-6.00 | 0.45-0.65 | | | ... |
| P9 | S50400 | 0.15max | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 | | | ... |
| P11 | K11597 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | | | ... |
| P12 | K11562 | 0.05-0.15 | 0.30-0.61 | 0.025 | 0.025 | 0.50 max | 0.80-1.25 | 0.44-0.65 | | | ... |
| P22 | K21590 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 max | 1.90-2.60 | 0.87-1.13 | | | ... |
| P91 | K91560 | 0.08-0.12 | 0.30-0.60 | 0.02 | 0.01 | 0.20-0.50 | 8.00-9.50 | 0.85-1.05 | 0.4 | 0.18-0.25 | N 0.030-0.070 |
| Al 0.02max |
| Cb 0.06-0.10 |
| Ti 0.01 max |
| Zr 0.01max |
| P92 | K92460 | 0.07-0.13 | 0.30-0.60 | 0.02 | 0.01 | 0.50 max | 8.50-9.50 | 0.30-0.60 | 0.4 | 0.15-0.25 | N 0.03-0.07 |
| Al 0.02 max |
| Cb 0.04-0.09 |
| W 1.5-2.00 |
| B 0.001-0.006 |
| Ti 0.01 max |
| Zr 0.01 max |
| ASTM A106 | Grade B | | 0.3 | 0.29–1.06 | 0.035 | 0.035 | 0.1 | 0.4 | 0.15 | 0.4 | 0.08 | |
| Grade C | | 0.35 | 0.29–1.06 | 0.035 | 0.035 | 0.1 | 0.4 | 0.15 | 0.4 | 0.08 | |
6. Mechanical Properties
| Standards | Steel pipes No. | Tensile strength | Yield strength | Elongation | Impact energy | Hardness |
| (Mpa) | (Mpa) | (%) | (J) |
| ASTM A335 | P5 | ≥415 | ≥205 | ≥22 | ≥35 | ≤187HB |
| P9 | ≥415 | ≥205 | ≥22 | ≥35 | |
| P11 | ≥415 | ≥205 | ≥22 | ≥35 | ≤163HB |
| P12 | ≥415 | ≥220 | ≥22 | ≥35 | ≤163HB |
| P22 | ≥415 | ≥205 | ≥22 | ≥35 | ≤163HB |
| P91 | 585～760 | ≥415 | ≥20 | ≥35 | ≤250HB |
| P92 | ≥620 | ≥440 | ≥20 | ≥35 | ≤250HB |
| ASTM A106 | Grade B | ≥415 | ≥240 | ≥22 | ≥35 | / |
| Grade C | ≥485 | ≥275 | ≥20 | ≥35 | / |
7. Available Size Range:
| OD | Thickness |
| mm | inch | mm | SCH |
| 88.9~1422 | 3''~ 56'' | 2.11~140 | ≥SCH10 |
| *If the steel grades and size you are looking for are not listed
above, please contact us for further information. |
