Alloy Steel F91 Round Bars and Rods
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Get a QuoteAlloy Steel Grade F91 Explained
Alloy Steel Grade F91 is a high-strength martensitic chromium-molybdenum-vanadium alloy steel. To begin with, it is specifically developed for advanced high-temperature applications where superior creep resistance and fatigue strength are essential. Furthermore, it delivers outstanding oxidation resistance at elevated temperatures — making it a top-tier choice for modern thermal and combined-cycle power plants.
Why do power generation engineers choose Grade F91 for critical high-temperature components? First and foremost, its advanced alloy composition provides exceptional creep resistance, ensuring long-term structural stability under continuous heat exposure. In addition, its high fatigue strength makes it ideal for thick-wall piping and components subjected to cyclic thermal and pressure loads. Moreover, its excellent oxidation resistance reduces the risk of surface degradation, extending service life and minimizing maintenance.
Consequently, Grade F91 is widely used in modern thermal and combined-cycle power plants. Furthermore, it is also trusted for thick-wall piping, headers, and critical pressure components requiring long-term reliability. Equally important, its combination of creep resistance, fatigue strength, and oxidation protection makes it the preferred choice for advanced power generation applications where performance, safety, and longevity are non-negotiable.
Need premium Alloy Steel Grade F91 round bars for your advanced power generation project? Contact our technical team today — we’ll help you select the right size and specifications for your requirements, and provide a competitive quote tailored to your needs.
Other Types of Alloy Steel F91 Bars
- Square bars engineered for extreme temperature and pressure service
- Grade: Alloy Steel F91 / UNS K90901
- Manufactured according to ASTM A182 specifications
- Used in supercritical and ultra-supercritical power plants
- Hexagonal alloy steel bars ideal for high-strength fasteners
- ASTM A182 Alloy Steel F91 grade material
- Available in hot rolled, bright drawn, and polished conditions
- Commonly used in high-pressure steam piping systems
- Rectangular bars for fabrication of critical pressure components
- Material standard: ASTM A182 Alloy Steel F91
- Equivalent DIN material: 1.4903
- Used in power generation and advanced energy systems
- Flat alloy steel bars with outstanding creep resistance
- Produced in accordance with ASTM A182 F91
- Supplied in hot rolled and machined finishes
- Suitable for headers, supports, and pressure-retaining parts
- Bright finished bars with tight dimensional tolerance
- Ideal for CNC machining and precision components
- Manufactured as per ASTM A182 Alloy Steel F91
- Used in valves, studs, and turbine-related assemblies
- Forged alloy steel bars for extreme pressure and temperature duty
- Grade: Alloy Steel F91 as per ASTM A182
- Excellent creep strength and long-term structural stability
- Used in power plants, refineries, and heavy engineering
ALLOY STEEL F91 ROUND BAR EQUIVALENT GRADES
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F91 | K90901 | 1.4903 |
SPECIFICATION OF ALLOY STEEL F91 ROUND BAR
| Product Standard | ASTM A182 / ASME SA182 |
|---|---|
| Dimension Standard | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Size | 14 mm – 300 mm |
| Length | 1 to 6 meters, Custom Cut Length |
| Form | Round, Square, Hex (AF), Rectangle, Billet, Ingot, Forging |
CHEMICAL COMPOSITION OF ALLOY STEEL F91 ROUND BAR
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo | Cb | N |
|---|---|---|---|---|---|---|---|---|---|---|
| F91 | 0.08 – 0.12 | 0.30 – 0.60 | 0.020 max | 0.010 max | 0.20 – 0.50 | 0.40 max | 8.0 – 9.5 | 0.85 – 1.05 | 0.06 – 0.10 | 0.03 – 0.07 |
MECHANICAL PROPERTIES OF ALLOY STEEL F91 ROUND BAR
| Grade | Tensile Strength (MPa) min | 0.2% Yield Strength (MPa) min | Elongation (% in 50mm) min | Rockwell B (HRB) max | Brinell (HB) max |
|---|---|---|---|---|---|
| F91 | 585 | 415 | 20 | — | 248 max |
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Looking for high-quality Alloy Steel F91 Round Bars & Rods? Our products are manufactured in compliance with ASTM A182 and ASME SA182 standards. Get in touch with us today.
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