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Location: HOME > PRODUCTS > High-quality alloy > High temperature Alloy > Inconel 625 (UNS N06625) Ni-Cr-Mo-Nb High-Temperature Corrosion-Resistant Alloy

Inconel 625 (UNS N06625) Ni-Cr-Mo-Nb High-Temperature Corrosion-Resistant Alloy

Inconel 625 (UNS N06625) is a Ni-Cr-Mo-Nb solid solution strengthened high-temperature corrosion-resistant alloy. With high molybdenum and high niobium as the core strengthening elements, it has ultra-high strength and excellent resistance to pitting corrosion, crevice corrosion, and stress corrosion. It can be used stably for a long time in the range of -196℃ to 980℃. It can achieve high strength without precipitation hardening heat treatment, making it an all-round material for chemical, marine, nuclear power, and aerospace fields.

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Name	High-temperature resistant alloy
Thickness	Common thickness	0.5–6 mm (for stamping, bending, household appliances / automotive parts)
	Medium-thick specification	6–20 mm (for steel structures, mechanical bases)
	Thick specification	20–100 mm (for heavy-duty frames, pressure vessels)
Tolerance	±0.02–±0.10 mm (varies with thickness)
Width	1000、1219、1250、1500、1800、2000
Length	plate/sheet:2000、2500、3000、6000、12000mm	Coil:Single roll weight: 8 to 25 tons
Material Standards	AISI, ASTM, ASME, DIN, BS, EN, ISO, JIS, SAE, etc.
Delivery Condition	AR / As Rolled ，TMCP / Thermo-Mechanical Controlled Process ，N / Normalized，NR / Normalized Rolled ，CR / Controlled Rolling
Surface treatment	Pickling and passivation, sandblasting, polishing (including mechanical polishing and chemical polishing, achieving a surface finish of Ra≤0.8μm), annealing.
Delivery status	Solution-treated and aged (ST) state, cold-rolled/hot-rolled state
Delivery Time	within 5-10 days(Special specifications will take 15 to 20 days)

Inconel 625 (UNS N06625) is a Ni-Cr-Mo-Nb solid solution strengthened high-temperature corrosion-resistant alloy. With high molybdenum and high niobium as core strengthening elements, it possesses ultra-high strength and excellent resistance to pitting/crevice corrosion and stress corrosion. It can operate stably for extended periods at temperatures ranging from -196℃ to 980℃, achieving high strength without precipitation hardening heat treatment. It is a versatile material for chemical, marine, nuclear power, and aerospace applications.

Common Applications (Main Export Scenarios):

Marine Engineering: Seawater desalination equipment, subsea production trees, offshore platform pipelines, propeller shafts, deep-sea pressure vessels

Chemical/Petrochemical: Acid-resistant reactors, mixed acid (nitric acid/sulfuric acid/hydrochloric acid) heat exchangers, flue gas desulfurization absorption towers, phosphoric acid production equipment

Energy & Power: Nuclear power steam generator heat transfer tubes, gas turbine components, desulfurization and denitrification devices, nuclear waste treatment equipment

Aerospace: Engine combustion chambers, exhaust systems, rocket thrust chambers, high-temperature structural components, aerospace fasteners

Environmental/Pharmaceutical: Waste incinerator components, pharmaceutical reaction vessels, bleaching equipment, valves and flanges for highly corrosive conditions

Others: Shipbuilding, medical implants, high-temperature heat treatment tooling, chloride ion corrosion-resistant components

United States UNS/ASTM	China /GB	Germany W.Nr./DIN	United Kingdom /BS	France AFNOR	Japan /JIS
N06625	NS336	2.4856	NA21	NC22DNb	NCF 625
Inconel 625	GH3625 (GH625)	NiCr22Mo9Nb	NA21	NC22DNb	NCF 625

Chemical composition (mass fraction, %)

Element

Nb+Ta

Content

≥58.0

20.0~23.0

8.0~10.0

3.15~4.15

≤5.0

≤0.10

≤0.50

≤0.40

≤0.015

Mechanical properties (inspection standards)

Tensile strength Rm	Proportional limit Rp0.2	Strain at break A5	Hardness HB	Density	Melting point range
≥827 MPa	≥414 MPa	≥30%	≤220	8.44 g/cm³	1290-1350℃

Application Areas

Core Advantages

Top-tier corrosion resistance: Resistant to chloride pitting, crevice corrosion, and stress corrosion cracking (SCC); resistant to seawater, mixed acids, hydrogen sulfide, and high-temperature flue gas.

Extremely high strength: Solution-solution strength far exceeds that of 316L and Inconel 600; excellent creep and fatigue resistance at medium and high temperatures.

Wide temperature adaptability: Good toughness at low temperatures (-196℃); stable oxidation and carburization resistance at high temperatures (980℃).

Excellent machinability and weldability: Easy to cold and hot form; no tendency for hot cracking during welding; no need for post-weld heat treatment.

Strong compatibility with various operating conditions: Dual corrosion resistance in oxidizing and reducing environments; NACE highest level certification for acidic gases.

Main Disadvantages

High price: High nickel, molybdenum, and niobium content; raw material and production costs are far higher than stainless steel.

Significant work hardening: Easily hardens during cutting; tool wear is rapid; requires specialized processes and tools.

Long-term aging embrittlement: Long-term service at 550~700℃ will cause intermetallic phase precipitation, slightly reducing plasticity.

Limited high-temperature strength: Strength above 980℃ is lower than Inconel 718. Isoprecipitation-strengthened alloys

Hot-selling products/Standards

Plate/Strip: ASTM B443, ASME SB443, AMS 5599

Seamless Tube: ASTM B444, ASME SB444, AMS 5581

Bar/Wire: ASTM B446, ASME SB446, AMS 5666

Forgings/Flanges: ASTM B564, ASME SB564

European Standards: EN 10216-5, DIN 17752

Documentation and Certification

Material Certificate: Mill Test Certificate (MTC), conforming to GB/ASTM/EN standards

Test Report: Chemical composition, mechanical properties, non-destructive testing (UT/MT/PT)

Packaging and Transportation

Rust Prevention: Passivation / Pickling / Rust-preventive oil + moisture-proof paper

Crater: Solid wood pallet / iron box, moisture-proof, impact-resistant

Transportation: Suitable for sea/air freight, marked with moisture-proof, shock-proof, high-end alloy

Payment Methods

Flexible payment terms available: T/T and L/C. For new clients, 30% advance payment for production, balance against copy of B/L. L/C is acceptable for large & regular orders to secure both parties.

Previous:Inconel 718（UNS N07718）Ni-Cr-Fe-Mo-Nb High-temperature Alloy

Next:Inconel 600 (UNS N06600) Ni-Cr-Fe Based Superalloy

Warehousing Management

Before each batch of steel leaves the factory, a complete process inspection is strictly carried out. From chemical composition, mechanical properties to dimensional tolerance and surface quality, each item is carefully checked to ensure compliance with national standards and export regulations. At the same time, the quantity, packaging and rust prevention treatment are also verified. An original factory warranty certificate is attached, guaranteeing the quality. Before shipment, inspection photos are provided. Any non-compliant items will not be released, and the quality is fully controllable throughout the process. This ensures your overseas purchasing is safe and worry-free.

All items are visually inspected before delivery. No cracks, deformation, rust, scratches or cutting marks are allowed; edges must be smooth. Only visually sound products will be shipped.

Thickness, width, length, wall thickness, outer diameter have been measured. Straightness, curvature, torsion, diagonal tolerance all meet the corresponding tolerance requirements.

Quality inspection includes: mechanical property tests (yield strength, tensile strength), elongation rate, impact energy, hardness testing, chemical composition testing, process performance testing, etc.

Inspection according to packaging requirements: secure binding, moisture-proof film, rust-proof paper, export fumigation/fumigation-free wooden crates, shipping marks, gross weight, net weight, etc.

We will provide full reception services to support the customers' on-site inspection of the goods.

Hot Rolling Production Line

Cold rolling precision processing

Cold drawing/cold rolling line

Hot Rolling Production Line

Hot rolling production line (producing hot-rolled coils/medium-thick plates, thickness 2–60mm)

Cold rolling precision processing

(Producing ultra-thin / high-precision / shiny panels, with thickness ranging from 0.1 to 3mm, for high-end products)
Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

Cold drawing/cold rolling line

(High-precision cold-drawn round steel, square steel, hexagonal steel, and special-shaped bars)

Warehousing Management

A ten-thousand-ton standardized warehouse with grid-based zoning and system positioning enables rapid material retrieval and reduces the time spent searching for materials.

Inbound inspection: Verify the physical items against the inbound form, inspect the appearance, dimensions, and labels. Once confirmed to be correct, the materials are entered into the ERP system and processed for storage.

Logistics and Global Delivery: Self-operated fleet + contracted logistics partners; expedited service available for urgent orders.

International Shipping: Supports FOB, CIF, DDP, and other trade terms, covering 100+ countries and regions.

Process: Booking → Trucking → Customs Declaration → Loading onto Ship/Aircraft → Bill of Lading Issuance → Document Delivery → Destination Port Customs Clearance (Optional) → Last-Mile Delivery.

Provides door-to-door one-stop logistics with full tracking to ensure safe and timely arrival of goods.

After-Sales Service and Traceability: Delivery receipts, logistics information, and quality inspection documents are sent to customers within 24 hours of shipment.

Established a full product lifecycle traceability system, allowing tracking of production, quality inspection, warehousing, and transportation records.

Follow-up inspection within 72 hours of arrival; rapid response and handling of quality issues; assistance in resolving customs clearance issues for foreign trade orders.

Packaging Method