
| Feature | Specification Details |
| Material Grade | ASTM A335 Grade P91 / ASME SA335 P91 |
| Common Name | 9 Chrome 1 Moly Modified (9Cr-1Mo-V) |
| Standard | ASTM A335, ASTM A182, EN 10216-2 |
| Diameter | 10mm to 500mm |
| Length | 3 to 6 Meters or Cut-to-Size |
| Finish | Bright, Black, Polished, or Ground |
| Heat Treatment | Normalizing ($1040\text{C} - 1080\text{C}$) & Tempering ($730\text{C} - 800\text{C}$) |
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ASTM A335 Grade P91 Alloy Steel Round Bars are high-temperature martensitic alloy steels widely utilized in the power generation and petrochemical industries. P91 steel is specifically designed to provide exceptional creep strength, oxidation resistance, and high-temperature durability. By incorporating Vanadium and Niobium, this grade offers significantly higher allowable stresses than standard Grade 9 steels.
Key Performance Features:
Enhanced Creep Resistance: Maintains structural stability under high stress at temperatures up to 600C.
High Thermal Conductivity: Better heat transfer compared to austenitic stainless steels.
Oxidation Resistance: High Chromium content ($9\%$) provides excellent protection against scaling.
Cost Efficiency: Higher strength allows for thinner walls and lighter weight in high-pressure piping systems.
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