Shaanxi Shangyou Stainless Steel Co., Ltd. supplies Nickel Alloy 625, also known as Inconel 625, identified as UNS N06625 and Werkstoff 2.4856, in round bar and rod form according to ASTM B446 / ASME SB-446 and AMS 5666.

Nickel Alloy 625 is a nickel-chromium-molybdenum alloy with an addition of niobium (3.15-4.15%) that provides high strength without the need for a strengthening heat treatment. The alloy offers high strength, excellent corrosion resistance, good fatigue strength, and oxidation resistance up to 1,093°C (2,000°F). It is non-magnetic, exhibits excellent weldability, and maintains its properties across a wide temperature range from cryogenic to elevated temperatures. Typical applications include aerospace components, chemical processing equipment, marine engineering, and oil and gas hardware.

ASTM B446 specifies three grades of Alloy 625 round bar based on heat treatment:

Grade 1 (Annealed)

Material is normally employed in service temperatures up to 593°C (1,100°F). Provides excellent corrosion resistance and ductility while maintaining high strength.

Grade 2 (Solution Annealed)

Material is normally employed in service temperatures above 593°C (1,100°F) when resistance to creep and rupture is required. Solution annealing provides improved high-temperature performance.

Grade 3 (Solution Annealed and Cold Worked)

Material is normally employed in services where higher strengths are needed. Cold working after solution annealing increases mechanical properties.

Caution: Hot-working or reannealing may change properties significantly, depending on working history and temperatures.

Alloy 625 round bar offers outstanding resistance to a wide range of corrosive environments.

Key Corrosion Characteristics:

• Excellent resistance to pitting, crevice corrosion, and chloride stress-corrosion cracking
• Outstanding resistance to seawater, salt water, and marine environments
• Good oxidation resistance up to 1,093°C (2,000°F)
• Resistance to mineral acids (phosphoric, sulfuric, hydrochloric) and mixtures
• Resistance to alkalis, organic acids, and neutral salts
• Excellent fatigue strength and weldability
• Non-magnetic austenitic structure
• NACE MR0175 / ISO 15156 compliant for sour-service applications when properly processed

Selection Considerations:

• For applications above 593°C, Grade 2 (solution annealed) is recommended
• For maximum strength, Grade 3 (solution annealed + cold worked) should be considered
• The alloy maintains uniform performance from cryogenic to over 1,000°C
• Final selection must consider the specific medium, concentration, temperature, and exposure conditions

• Aerospace: Jet engine components, turbine blades, exhaust systems, engine thrust-reverser systems
• Chemical Processing: Chemical plant equipment, heat exchangers, reactor vessels
• Marine Engineering: Specialized seawater equipment, subsea cable connectors, submarine propulsion motors
• Oil and Gas: Downhole tooling, wellhead equipment, subsea production systems, manifolds
• Power Generation: High-temperature components, turbine hardware
• Industrial: Valves, fasteners, pump shafts

Available quality-control services include:

• Heat-number traceability
• Chemical composition verification
• Tensile, yield and elongation testing
• Hardness inspection
• Dimensional and surface inspection
• Positive Material Identification (PMI)
• Ultrasonic testing
• Dye penetrant inspection
• Heat-treatment records
• EN 10204 3.1 material certificate

For an accurate quotation, please provide:

Alloy Grade · Standard · Product Form · Diameter · Length · Grade (1, 2, or 3) · Quantity · Surface Finish · Inspection Requirement · Application · Working Temperature · Destination Port

For corrosive or high-temperature environments, also provide:

Chemical Medium · Concentration · Temperature · Pressure · Oxidizing or Reducing Conditions

• Request ASTM B446 Alloy 625 Bar Quote
• Upload Drawing or MTO
• Check Available Stock
• Ask for Alloy Selection Support

ASTM B446 Alloy 625 round bar (UNS N06625) is a nickel-chromium-molybdenum-niobium alloy bar with high strength, excellent corrosion resistance, good fatigue strength, and oxidation resistance up to 1,093°C.

The UNS designation is N06625; the European Werkstoff number is 2.4856; the EN material symbol is NiCr22Mo9Nb.

ASTM B446 specifies three grades: Grade 1 (Annealed) for service up to 593°C; Grade 2 (Solution Annealed) for service above 593°C with creep resistance; Grade 3 (Solution Annealed + Cold Worked) for higher strength requirements.

Stock sizes range from approximately 12.50 mm (0.492") to 254 mm (10.0") diameter, with larger sizes available on request.

No. Alloy 625 is not age-hardenable. High strength is achieved through solid solution strengthening from molybdenum and niobium additions.

It resists pitting, crevice corrosion, chloride stress corrosion cracking, seawater, mineral acids (phosphoric, sulfuric, hydrochloric), alkalis, organic acids, and oxidation up to 1,093°C.

Alloy 625 is essentially non-magnetic with a magnetic permeability of approximately 1.0006.

Yes. Alloy 625 is approved for sour-service applications per NACE MR0175 / ISO 15156 when properly processed and certified.

Yes. Alloy 625 exhibits excellent weldability and can be welded using common techniques.

Please provide the standard (ASTM B446), product form (round bar), diameter, Grade (1, 2, or 3), quantity, inspection requirements, application, working temperature and destination port. For corrosive service, also specify the chemical medium and concentration.