Inconel 625
Certification: ISO9001:2015
Alloy category: Corrosion-resistant alloy
Substrate shape: Axis wire/Strip/Straight bar
Alloy series: Nickel-chromium-iron alloy
Implementation standard: ASTM
Application areas: Automobile, petrochemical, industrial, aerospace, energy
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
- Send E-mail: ss@gneesteel.com
Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of inconel 625 in China. If you're going to wholesale high quality inconel 625 made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
Inconel 625 introduce
Gnee Alloy Inconel 625 introduce
Inconel 625 is a highly corrosion- and heat-resistant nickel-chromium-molybdenum superalloy; it derives its excellent mechanical properties primarily from solid-solution strengthening rather than heat treatment, thereby offering resistance to post-weld cracking.
Its operating temperature range extends from cryogenic levels up to 1093°C (2000°F), maintaining excellent strength and toughness throughout. Regarding corrosion resistance, it is highly resistant to pitting, crevice corrosion, and oxidation, and is virtually immune to chloride-ion stress corrosion cracking.
As a professional Inconel 625 supplier, GNEE STEEL covers all common product forms. Click below to check detailed parameters of Inconel 625 pipes, plates, pipe fittings and bars.
Inconel 625 Available Shape
Inconel 625 Seamless Pipe
Inconel 625 Plate
Inconel 625 Pipe Fitting
Inconel 625 Bar
Inconel 625 ASTM Standard
ASTM (American Society for Testing and Materials) for various products made out of Inconel 625 are as follows：
| Bar | ASTM B 446, ASME SB 466, AMS 5666, ISO 9723, VdTUV 499, BS 3076 NA21, EN 10095, DIN 17752, ASME Code Case 1935 |
| Rod | ASTM B 446, ASME SB 466, ISO 9723, VdTUV 499, BS 3076 NA21, EN 10095, DIN 17752, SME Code Case 1935 |
| Forging Stock | ASTM B 564, ASME SB 564, AMS 5666, ISO 9725, SME Code Case 1935, DIN 17754 |
| Plate | ASTM B 443, ASME SB 443, AMS 5599, AMS 5869, MAM 5599, ISO 6208, VdTUV 499, BS 3072 NA21, EN 10095, DIN 17750, ASME Code Case 1935 |
| Sheet | ASTM B 443, ASME SB 443, AMS 5599, AMS 5869, MAM 5599, ISO 6208, VdTUV 499, BS 3072 NA21, EN 10095, DIN 17750, ASME Code Case 1935 |
| Pipe Seamless | ASTM B444, ASTM B829, ASME SB 444, ASME SB 829, BS3074 NA21 |
| Pipe Welded | ASTM B705, ASTM B775, ASME SB 705, ASME SB 775 |
| Tube Seamless | ASTM B444, ASTM B829, ASME SB 444, ASME SB 829, AMS 5581, BS3074 NA21, AMS 5581 Type 1 |
| Tube Welded | ASTM B704, ASTM B751, ASME SB 704, ASME SB 704, AMS 5581, AMS 5581 Type 2 |
| Tube | VdTUV 499, ISO 6207, DIN 17751, ASME Code Case 1935 |
| Fittings | ASTM B 366, ASME SB 366 |
| Other | UNS N06625, W. Nr 2.4856, ISO NW6625, NACE MR-01-75, INCONEL 625 (trademark), MSRR 7264 |
Inconel 625 Specification
Inconel 625 Chemical Composition Restrictions |
|||||||||||||
| Weight % | Ni | Cr | Mo | Nb + Ta | Fe | Ti | C | Mn | Si | S | P | Al | Co |
| Alloy 625 | 58.0 min | 20 - 23 | 8 -10 | 3.15 -4.15 | 5.0 max | 0.40 max | 0.10 max | 0.50 max | 0.50 max | 0.15 max | 0.15 max | 0.40 max | 1.0 max |
Typical mechanical properties of Inconel 625
| Material | Form and Condition | Tensile Strength MPa | Yield Strength (0.2% Offset) MPa | Elongation 4D(%) | Hardness HB | ||
| Ksi | MPa | Ksi | MPa | ||||
| Alloy 625 Bar | Annealed | 120 | 827 | 60 | 414 | 30 | ≤ 287 HB |
| Alloy 625 Sheet | Annealed | 120 | 827 | 60 | 414 | 30 | 145-240 |
| Alloy 625 Tube Seamless and Welded |
Annealed | 120 | 827 | 60 | 414 | 35 | - |
Inconel 625 corrosion resistance
| Environment | Quantitative Performance Index | Technical Notes |
|---|---|---|
| Oxidizing Acids (HNO₃) | Corrosion rate ≤0.05 mm/year in boiling 65% HNO₃ | Dense Cr₂O₃ passive film suppresses oxidizing acid dissolution |
| Reducing Acids (H₂SO₄, HCl) | Corrosion rate ≤0.15 mm/year at 80°C 10% H₂SO₄ | 8–10 wt.% Mo inhibits localized corrosion in reducing media |
| Chloride Pitting | Critical Pitting Temperature (CPT) = 85°C (ASTM G48, 6% FeCl₃) | PREN ≥53, resists pitting in 35,000 ppm Cl⁻ seawater |
| Crevice Corrosion | Critical Crevice Temperature (CCT) = 62°C (ASTM G48, 6% FeCl₃) | No crevice attack after 18-month full immersion in natural seawater |
| Chloride Stress Corrosion Cracking | Immune to SCC under 150°C saturated chloride medium | High Ni matrix eliminates chloride-induced cracking risk |
| Seawater | Uniform corrosion rate ≈0.01 mm/year in ambient flowing seawater | Stable passivation layer in stagnant & tidal marine environments |
| High-Temperature Oxidation | Continuous oxidation service limit: 980°C | Adherent duplex Cr₂O₃ spinel scale slows oxygen diffusion |
| Sour Gas (H₂S/CO₂) | Compliant with NACE MR0175 / ISO 15156-3, max service temp 232°C | Hardness controlled ≤35 HRC to avoid sulfide stress cracking |
Inconel 625 Corrosion Resistance Rating (1-5, 5 = best)
| Environment | Inconel 625 |
|---|---|
| Sulfuric Acid | 5 |
| Hydrochloric Acid | 5 |
| Seawater | 5 |
| Chloride SCC | 5 |
| High-Temp Oxidation (980°C) | 5 |
Inconel 625 Product Dimensions and Specifications
Bar Products
| Diameter (mm) | Length (mm) | Tolerance | Surface |
|---|---|---|---|
| 6 – 25 | 2000 – 6000 | h6 – h8 | Ground / Bright |
| 25 – 50 | 2000 – 6000 | h6 – h8 | Ground / Bright |
| 50 – 100 | 2000 – 4000 | h7 – h9 | Black / Rough Turned |
| 100 – 200 | 1000 – 3000 | h8 – h10 | Black / Rough Turned |
Tube Products
| OD (mm) | Wall Thickness (mm) | Tolerance | Surface |
|---|---|---|---|
| 6 – 30 | 0.5 – 3.0 | ±0.05 – ±0.10 mm | BA / AP |
| 30 – 50 | 1.0 – 5.0 | ±0.10 – ±0.15 mm | BA / AP |
| 50 – 100 | 2.0 – 8.0 | ±0.15 – ±0.30 mm | BA / AP |
Plate Products
| Thickness (mm) | Width (mm) | Length (mm) | Tolerance |
|---|---|---|---|
| 0.5 – 4.0 | 500 – 1200 | 1000 – 3000 | ±5% – ±10% |
| 4.0 – 10.0 | 500 – 1500 | 1000 – 4000 | ±5% – ±10% |
| 10.0 – 25.0 | 500 – 1500 | 1000 – 4000 | ±5% – ±10% |
Applications of inconel 625 Alloy
| Industry | Application | Operating Temperature |
|---|---|---|
| Chemical Processing | Reactors, columns, heat exchangers, piping | 400 – 600°C |
| Marine Engineering | Seawater cooling systems, pumps, valves | Ambient – 300°C |
| Aerospace | Exhaust systems, hydraulic lines, fuel systems | 400 – 600°C |
| Oil & Gas | Sour gas piping, chemical injection systems | Ambient – 400°C |
| Power Generation | FGD scrubbers, stack liners | 100 – 300°C |
| Nuclear | Reactor components | 300 – 500°C |
Nickel Based Alloy 625 Packaging
GNEE Group Alloy 625 Product Packaging
inconel Alloy 625 Testing
GNEE Group Nickel Alloy 625 Testing
About Gnee Alloy
Submit the following key details to receive an NACE-compliant export quote and technical compliance report for Inconel 625 within one hour:
Product Category: Seamless/welded pipe, cold-rolled sheet/plate, round/hex bar + exact dimensions, wall thickness, and surface finish (BA/AP/polished)
Application Industry & Extreme Conditions: Offshore sour gas fields / Aerospace exhaust systems / Chemical chloride reactors / Nuclear radiation circuits; continuous operating temperature and corrosive media type (seawater/H₂S/acid/radioactive water)
Smelting Grade Requirements: VIM (single vacuum) industrial grade / VIM+VAR (double vacuum) premium offshore/nuclear grade
Order Nature: Small corrosion test samples / Annual bulk framework orders / Urgent MRO (Maintenance, Repair, and Operations) replenishment
Special Certification Needs: ASTM/AMS/NACE 3.2 witness reports, Kazakhstan/EU certificates of conformity, nuclear dual-use export permits
Free small corrosion test samples available (buyer covers international shipping costs only)
Full NACE technical data sheets for Inconel 625 pipes, sheets/plates, and bars sent immediately upon inquiry submission
Customization Services: U-bend pipe forming, laser cutting for sheets/plates, and precision machining of bars to specific lengths
Gnee Alloy inconel 625 certificate
FAQ
Q1 What is the unified international grade of Inconel 625, and what standards apply to different products?
A Unified UNS code UNS N06625, European W.Nr 2.4856, Chinese GH3625. Bar follows ASTM B446/AMS5666; seamless tube ASTM B444; plate ASTM B443/AMS5599; offshore sour gas projects add mandatory NACE MR0175 certification, all standards mutually recognized by global offshore, aerospace and nuclear tender projects.
Q2 What is the maximum long-term safe service temperature of Inconel 625 alloy?
A Long-term stable continuous service ≤980℃; excellent creep & fatigue performance at 650℃ high temperature; outstanding chloride corrosion resistance under normal temperature seawater environment, the only alloy suitable for simultaneous high temperature + deep sea sour gas composite extreme working conditions.
Q3 Does Inconel 625 tube/sheet/bar require aging heat treatment after processing?
A No aging required, it belongs to molybdenum-niobium solid solution strengthened nickel alloy. Only single 1093~1150℃ air cooling solution annealing can maximize chloride corrosion resistance, creep strength and cold forming ductility; aging treatment will reduce anti-SCC performance and is prohibited for all offshore & nuclear export finished products.
Q4 What melting grade must be selected for deep sea offshore oil subsea pipeline export orders to Middle East & Europe?
Mandatory VIM+VAR dual vacuum remelting premium grade, must provide full UT+ET triple NDT inspection record, matched NACE MR0175 corrosion certificate, complete batch PMI traceability archive to pass offshore EPC supplier audit and cross-border customs clearance.
Q5 What surface finish is the mainstream choice for global offshore subsea seamless tube bulk orders?
BA bright annealed inner & outer wall surface, zero oxide scale, avoid seawater medium scaling and radioactive residue accumulation, meet offshore pipeline ultra-clean long-cycle operation standards, accounts for 85% of global subsea tube export bulk orders.
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