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Which material is best for power plant piping?
Quick answer
Main steam and hot reheat: P91 Alloy Steel (Modified 9% chromium-1% molybdenum-vanadium) or P22 Alloy Steel (2¼% chromium-1% molybdenum). Cold reheat and feedwater: ASTM A106 Grade B or ASTM A106 Grade C. Auxiliary and cooling systems: ASTM A53 Grade B or SS 316L Stainless Steel.
| Service condition | Recommended materials |
|---|---|
| Main steam and hot reheat | P91 Alloy Steel (Modified 9% chromium-1% molybdenum-vanadium), P22 Alloy Steel (2¼% chromium-1% molybdenum) |
| Cold reheat and feedwater | ASTM A106 Grade B, ASTM A106 Grade C |
| Auxiliary and cooling systems | ASTM A53 Grade B, SS 316L Stainless Steel |
Products
Buying tips
- State IBR requirements
- Match fittings (A234 WP91) and flanges (A182 F91)
- Specify hardness and NDT for P91
- Include bolting grade (B16 for hot joints)
Industries
Frequently asked questions
What is the best material for power plant piping?
It depends on the service condition. Main steam and hot reheat: P91 / T91 / Grade 91 (9Cr-1Mo-V) or P22 / T22 / Grade 22 (2¼Cr-1Mo); Cold reheat and feedwater: ASTM A106 Grade B or ASTM A106 Grade C; Auxiliary and cooling systems: ASTM A53 Grade B or SS 316L.
Which product forms are used for power plant piping?
Pipes, Fittings, Flanges, Bolts.
How should I specify materials for this application?
State IBR requirements. Match fittings (A234 WP91) and flanges (A182 F91). Specify hardness and NDT for P91. Include bolting grade (B16 for hot joints).