Nickel Alloy Inconel 625 (UNS N06625) Shaft
- Solid-solution strengthened Inconel 625 solid shaft, UNS N06625, EN 2.4856, fully compliant with ASTM B446 bar standard
- Mo & Nb composite solid-solution hardening delivers high strength without aging heat treatment
- Certified to NACE MR0175 standard, outstanding anti-SCC performance for sour oil & gas service
- Stable mechanical & oxidation performance from cryogenic -196℃ up to 980℃ continuous operation
- Excellent resistance to chloride pitting, crevice corrosion, mixed acid & seawater erosion
- Homogeneous single-phase austenite matrix, no carbide precipitation after welding or thermal cycles
- Hot rolled / cold drawn stock, custom diameter & full CNC turning, grooving, threading per CAD drawings
- Premium shaft blank for aerospace, subsea, nuclear power and heavy chemical rotating equipment
This series of Inconel 625 solid shafts are manufactured via hot rolling + cold drawing forming processes. Two standard heat treatment grades are available: Grade 1 Low-Temp Solution Annealed for general corrosion service; Grade 2 High-Temp Solution Annealed for high-temperature creep resistant working conditions.
Inconel 625 is classic solid-solution nickel superalloy strengthened by molybdenum and niobium elements. It combines ultra-high mechanical strength and full-spectrum corrosion resistance, outperforming duplex and austenitic stainless steel in harsh high-temperature & chloride media. Solid shaft blanks eliminate complex forging pre-processing, directly machined into pump shafts, valve stems, subsea rotating spindles, aerospace turbine shafts and nuclear equipment transmission shafts for aerospace, offshore oil & gas, nuclear power, chemical and desalination industries.
- Ni-Cr-Mo-Nb single-phase solid-solution alloy, strength obtained without precipitation aging
- High molybdenum & niobium content greatly improves pitting resistance in brine and sour gas
- Dense chromium oxide film maintains oxidation resistance under long-term high-temperature circulation
- Retains full ductility and impact toughness at ultra-low cryogenic temperatures
- No intergranular sensitization after welding; no mandatory post-weld heat treatment required
- Good hot rolling, cold drawing and CNC machinability for all kinds of rotary shaft parts
| Grade | EN No. | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni Min | Mo | Nb+Ta | Fe ≤ |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Inconel 625 | 2.4856 | 0.10 | 0.50 | 0.50 | 0.015 | 0.015 | 20.0–23.0 | 58.0 | 8.0–10.0 | 3.15–4.15 | 5.0 |
| Property | Grade 1 (Low Temp Solution Annealed) | Grade 2 (High Temp Solution Annealed) |
|---|---|---|
| Delivery Condition | Hot Rolled / Cold Drawn, Solution Annealed, Stress‑Relieved, Pickled / Bright Annealed Optional | |
| Minimum Tensile Strength | ≥827 MPa (120 ksi) | ≥965 MPa (140 ksi) |
| Minimum 0.2% Yield Strength | ≥414 MPa (60 ksi) | ≥552 MPa (80 ksi) |
| Minimum Elongation (50mm gauge) | ≥30 % | ≥25 % |
| Max Brinell Hardness | ≤240 HB | ≤230 HB |
- Inconel Series: 600, 601, 625, 690, 718, X-750, HX
- Incoloy Series: 800, 800H, 800HT, 825, 925, G-3
- Hastelloy Series: C4, C22, C276, C2000, B2, B3, G35
- Monel & Pure Nickel: Monel 400/K500, Nickel 200 / 201
- Duplex Stainless Steel: 2205, 2507, S32750, F51
- Austenitic Stainless Steel: 304, 316L, 904L, 254SMo
- Martensitic Stainless Steel: 410, 420, 431, 440C
- Alloy Steel: 4140, 4340, F22, F91, A105
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1 Solid-Solution High Strength Without Aging
Mo-Nb elements deliver inherent high strength after solution annealing, skip extra aging heat treatment, simplify shaft processing workflow.
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2 NACE Compliant Sour Gas Resistance
Excellent sulfide stress cracking resistance, safe for subsea and H₂S-containing oil & gas rotating shafts.
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3 Ultra-Wide Temperature Stability
Maintain consistent strength, toughness & anti-oxidation performance from cryogenic to high-temperature furnace service.
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4 Full-Spectrum Corrosion Protection
Resist seawater, brine, mixed mineral acids & hot alkali, replace multiple stainless steel grades in one material.
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5 Stable Welded Metallurgy
No harmful carbide segregation during welding; welded shaft assemblies retain full corrosion resistance.
- Aerospace jet engine turbine shafts, exhaust rotating spindle blanks
- Offshore subsea pump shafts, wellhead valve stems & rotary sealing spindles
- Sour oil & gas downhole transmission shafts, high-pressure valve rods
- Nuclear power reactor control shafts, heat exchanger rotating components
- Chemical high-temperature reactor agitator shafts, acid pump spindles
- Seawater desalination circulating pump main shafts
- Industrial high-temperature furnace roller shafts
We provide integrated hot rolling & cold drawing production, full CNC precision turning service per customer CAD/PDF drawings:
- Custom fixed-length cutting, facing, centering, external turning & chamfering
- Precision grooving, threading, spline machining, surface grinding & polishing
- Grade1 / Grade2 custom solution annealing heat treatment
- Pickling, bright annealing, passivation surface finishing
We supply Inconel 625 solid shaft blanks & finished machined shafts for aerospace, offshore, nuclear and chemical global industrial clients.
- 100% UT ultrasonic inspection to detect internal rolling defects & segregation
- Full batch tensile, yield & hardness mechanical testing per heat lot
- High-precision micrometer to control diameter straightness tolerance
- Spectrometer full spectrum chemical composition verification
- Metallographic single-phase austenite microstructure inspection
Mill Test Certificate EN 10204 3.1 can be issued and delivered together with shipment documents before delivery.
- Inner: Individual plastic sleeve wrap + waterproof anti-rust film for surface protection
- Outer: Reinforced fumigated wooden pallet with separation blocks to avoid scratch & bending
- Custom heavy-duty export packaging for large-diameter shafts available upon request
Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on shaft diameter, length, order quantity and custom machining demands.
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