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Here are the typical chemical compositions of P11, P22, and P91 materials—commonly used in high-temperature and pressure service applications, especially in power plants and petrochemical industries. These materials are specified under ASTM A335 (for seamless ferritic alloy-steel pipe) and ASTM A213 (for boiler and heat exchanger tubes).
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1. P11 (Grade 11) – ASTM A335 / A213
Material type: 1.25Cr-0.5Mo steel
|
Element |
Composition (%) |
|
Carbon (C) |
0.05–0.15 |
|
Manganese (Mn) |
0.30–0.60 |
|
Phosphorus (P) |
≤ 0.025 |
|
Sulfur (S) |
≤ 0.025 |
|
Silicon (Si) |
0.50–1.00 |
|
Chromium (Cr) |
1.00–1.50 |
|
Molybdenum (Mo) |
0.44–0.65 |
2. P22 (Grade 22) – ASTM A335 / A213
Material type: 2.25Cr-1Mo steel
|
Element |
Composition (%) |
|
Carbon (C) |
0.05–0.15 |
|
Manganese (Mn) |
0.30–0.60 |
|
Phosphorus (P) |
≤ 0.025 |
|
Sulfur (S) |
≤ 0.025 |
|
Silicon (Si) |
0.50–1.00 |
|
Chromium (Cr) |
1.90–2.60 |
|
Molybdenum (Mo) |
0.87–1.13 |
3. P91 (Grade 91) – ASTM A335 / A213
Material type: 9Cr-1Mo-V-Nb (Modified)
|
Element |
Composition (%) |
|
Carbon (C) |
0.08–0.12 |
|
Manganese (Mn) |
0.30–0.60 |
|
Phosphorus (P) |
≤ 0.020 |
|
Sulfur (S) |
≤ 0.010 |
|
Silicon (Si) |
0.20–0.50 |
|
Chromium (Cr) |
8.00–9.50 |
|
Molybdenum (Mo) |
0.85–1.05 |
|
Vanadium (V) |
0.18–0.25 |
|
Niobium (Nb) |
0.06–0.10 |
|
Nitrogen (N) |
0.03–0.07 |
|
Aluminum (Al) |
≤ 0.04 |
Notes:
P91 offers superior creep strength and oxidation resistance at high temperatures compared to P11 and P22.
All compositions are typically controlled within tight ranges depending on standards and manufacturing practices.
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