About material
✓ Available from European Stock
Looking for ASTM A182 F91, ASME SA-182 F91, Grade 91 or 9Cr-1Mo-V-Nb alloy steel round bars?
WTE PowerSteel is a European supplier and stockholder of ASTM A182 F91 chromium-molybdenum-vanadium-niobium alloy steel for demanding high-temperature and high-pressure applications.
We supply certified F91 round bars and cut-to-length pieces with full material traceability, EN 10204 3.1 certification and fast delivery throughout Europe and worldwide.
ASTM A182 F91 is a modified 9% chromium and 1% molybdenum creep-resistant alloy steel additionally strengthened with vanadium, niobium and controlled nitrogen content.
The material has been developed for components exposed to high pressure, elevated temperatures, thermal cycling and long-term mechanical loading. Its tempered martensitic structure provides excellent creep strength, high tensile and yield strength and good resistance to oxidation at elevated temperatures.
F91 is widely used for forged pressure-containing components in power plants, steam systems, petrochemical facilities, refineries, chemical processing equipment and other demanding energy applications.
We supply both full-length bars and accurately cut pieces according to customer requirements.
ASTM A182 F91 provides significantly higher creep strength and elevated-temperature performance than conventional chromium-molybdenum steels such as F11 and F22.
Its carefully controlled chromium, molybdenum, vanadium, niobium and nitrogen content provides excellent long-term mechanical stability under high-temperature and high-pressure operating conditions.
ASTM A182 F91 is widely used for critical components exposed to elevated temperatures, high pressure and long-term creep loading.
Typical applications include:
Our customers use ASTM A182 F91 in:
We supply:
Available diameters, lengths and heat-treatment conditions upon request.
ASTM A182 F91 material is supplied in accordance with:
ASTM A182 covers forged or rolled alloy-steel and stainless-steel components intended primarily for high-temperature pressure systems, including flanges, forged fittings, valves and similar pressure-containing parts.
When round bars are supplied for the manufacture of finished ASTM A182 components, the required manufacturing route, reduction ratio, heat treatment, testing, inspection and certification must be specified according to the applicable standard and customer requirements.
ASTM A182 F91 is a modified chromium-molybdenum creep-resistant steel containing nominally:
The exact chemical composition must comply with the applicable edition of ASTM A182 or ASME SA-182 and must be confirmed by the individual material inspection certificate.
ASTM A182 F91 combines high room-temperature strength with excellent long-term creep resistance at elevated temperatures.
Typical minimum room-temperature mechanical requirements include:
The exact required mechanical properties depend on the applicable standard edition, product dimensions, section thickness, heat-treatment condition, testing orientation and customer-specific requirements.
All mechanical values must be verified against the applicable ASTM or ASME specification and the individual inspection certificate.
Correct heat treatment is essential for ASTM A182 F91 because the required mechanical properties depend on the formation of a controlled tempered martensitic microstructure.
The material is normally supplied in a normalized and tempered condition.
The heat-treatment process generally includes:
Incorrect heat treatment can significantly reduce toughness, creep strength and long-term service performance. Heat-treatment records should therefore be reviewed as part of the material certification.
ASTM A182 F91 can be welded, but it requires strictly controlled welding procedures.
Typical welding requirements may include:
Improper welding or post-weld heat treatment can produce excessive hardness, reduced toughness or insufficient creep strength. Welding procedures must therefore be developed according to the applicable construction code and component dimensions.
Material can be supplied with:
All additional testing and documentation requirements must be specified at the enquiry or order stage.
This material is also known as:
ASTM A182 F91 is frequently compared with the European creep-resistant steel:
ASTM A182 F91 and EN 1.4903 / X10CrMoVNb9-1 belong to the same modified 9Cr-1Mo-V-Nb alloy family.
However, they must not automatically be considered fully interchangeable. The applicable product standard, chemical limits, mechanical properties, heat treatment, product form, testing and certification requirements must be reviewed before substitution.
ASTM A182 F91 provides substantially higher creep strength and improved oxidation resistance compared with ASTM A182 F22.
F91 contains approximately 9% chromium, while F22 contains approximately 2.25% chromium. The higher chromium content improves oxidation resistance, while vanadium, niobium and nitrogen additions provide precipitation strengthening and improved long-term creep performance.
F91 is therefore commonly selected for higher-temperature and higher-efficiency steam systems where conventional F22 material may not provide sufficient long-term performance.
WTE PowerSteel specializes in supplying creep-resistant steels, alloy steels and special materials for demanding high-temperature and high-pressure applications.
Our advantages include:
Whether you require a single cut piece, a complete bar or material for serial production, our team will help you select the correct dimensions, heat-treatment condition and inspection requirements.
ASTM A182 F91 is a modified 9Cr-1Mo creep-resistant alloy steel containing controlled additions of vanadium, niobium and nitrogen.
It is designed for forged and rolled pressure-containing components operating under high pressure and elevated temperatures.
F91 identifies Grade 91 alloy steel supplied according to ASTM A182 or ASME SA-182.
The letter “F” indicates a material grade intended for forged products such as flanges, fittings, valves and pressure-containing components.
ASTM A182 F91 and EN 1.4903 / X10CrMoVNb9-1 belong to the same modified 9Cr-1Mo-V-Nb material family and are frequently presented as comparable grades.
They are not automatically interchangeable because the product standards, chemical limits, mechanical requirements, heat treatment and inspection requirements may differ.
F91 contains approximately 9% chromium and additional vanadium, niobium and nitrogen, while F22 is a conventional 2.25Cr-1Mo alloy steel.
F91 generally provides higher creep strength, improved oxidation resistance and better performance in demanding high-temperature steam applications.
Yes. ASTM A182 F91 is specifically designed for elevated-temperature and creep-resistant service.
The maximum permissible operating temperature depends on the component design, stress level, wall thickness, applicable design code, heat treatment and required service life.
Yes. F91 is widely used for high-pressure flanges, valves, fittings, steam-system components and other pressure-containing parts.
Suitability for a specific application must be evaluated according to the applicable pressure-equipment and design code.
Yes. F91 can be welded using qualified and carefully controlled welding procedures.
Preheating, controlled interpass temperature, suitable filler material and post-weld heat treatment are normally required.
Post-weld heat treatment reduces residual stresses, tempers the hardened weld and heat-affected zone and helps restore the required toughness and creep-resistant microstructure.
Incorrect post-weld heat treatment may result in excessive hardness, low toughness or reduced long-term creep performance.
Yes. ASTM A182 F91 can be machined using suitable cutting tools, rigid machining conditions and parameters selected for its heat-treated strength.
Sawing, turning, milling, drilling, boring and threading are commonly performed on this material.
WTE PowerSteel supplies selected dimensions of ASTM A182 F91 round bars and cut-to-length pieces from European and international sources.
Please contact us for current stock availability, diameters, lengths, heat-treatment conditions and certification details.
Yes. We supply complete bars as well as accurately cut pieces according to customer requirements.
Additional machining, testing and inspection can be arranged upon request.
Yes. Material can be supplied with an EN 10204 3.1 inspection certificate showing the heat number, chemical composition, heat treatment, mechanical test results and other applicable inspection information.
Yes. Ultrasonic testing can be arranged according to the applicable ASTM, EN or customer-specific testing and acceptance standard.
The required method, acceptance level and reporting requirements should be specified in the enquiry.
For an accurate quotation, please specify:
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