1. Product Properties
Inconel 625 (UNS N06625 / W.Nr. 2.4856) is a solid-solution strengthened nickel-chromium-molybdenum superalloy forging bar engineered for high-strength applications across extreme temperature ranges — from cryogenic conditions up to 2000°F (1093°C). Strengthened by molybdenum and niobium additions, this alloy achieves exceptional mechanical properties without requiring precipitation-hardening treatment, simplifying fabrication while maintaining outstanding performance in aggressive environments.
| Product Name |
Inconel 625 Nickel Alloy Forging Bar |
| UNS Number |
N06625 |
| Werkstoff Number |
2.4856 |
| Alloy Type |
Nickel-Chromium-Molybdenum, Solid-Solution Strengthened |
| Applicable Standards |
ASTM B446, ASME SB-446, AMS 5666 |
| Available Forms |
Round Bar, Flat Bar, Square Bar, Hexagonal Bar |
| Diameter Range |
φ6 mm – φ500 mm (Custom Sizes Available) |
| Length |
500 mm – 6000 mm (Cut-to-Length Available) |
| Surface Finish |
Black, Peeled, Polished, Machined |
| Brand |
DINGSCO |
2. Material Overview
Inconel 625 is a high-performance nickel-based superalloy that derives its strength from solid-solution hardening by molybdenum (8.0–10.0%) and niobium (3.15–4.15%). Unlike precipitation-hardenable grades such as Inconel 718, Inconel 625 requires no aging heat treatment, which significantly simplifies fabrication, welding, and post-processing while delivering exceptional mechanical properties across a remarkably wide temperature spectrum.
A defining characteristic of Inconel 625 is its virtual immunity to chloride-induced stress corrosion cracking and outstanding resistance to pitting and crevice corrosion — driven by its high PREN (Pitting Resistance Equivalent Number) of 48–52. The alloy is non-magnetic, exhibits excellent fatigue strength, and retains high ductility and impact toughness at cryogenic temperatures down to -196°C (-320°F). Its excellent weldability via TIG, MIG, and SMAW processes using ERNiCrMo-3 filler further extends its versatility across demanding applications.
Key Advantage: Inconel 625 delivers a unique combination of high-temperature strength, broad-spectrum corrosion resistance, and fabrication simplicity — eliminating the need for post-weld heat treatment in most applications while maintaining integrity from cryogenic to 1093°C (2000°F).
3. Chemical Composition
| Element |
Ni |
Cr |
Mo |
Nb+Ta |
Fe |
Mn |
Si |
C |
Ti |
Al |
P |
S |
| Content (%) |
58.0 min |
20.0–23.0 |
8.0–10.0 |
3.15–4.15 |
5.0 max |
0.50 max |
0.50 max |
0.10 max |
0.40 max |
0.40 max |
0.015 max |
0.015 max |
4. Physical Properties
| Density |
8.44 g/cm³ (0.305 lb/in³) |
| Melting Range |
1290 – 1350°C (2350 – 2460°F) |
| Specific Heat (20°C) |
410 J/kg·K |
| Thermal Conductivity (20°C) |
9.8 W/m·K |
| Electrical Resistivity (20°C) |
1.29 µΩ·m |
| Modulus of Elasticity (20°C) |
207 GPa (30.0 * 10³ ksi) |
| Poisson's Ratio |
0.31 |
| Magnetic Permeability (RT) |
≤ 1.001 (Non-Magnetic) |
5. Mechanical Properties
| Condition |
Tensile Strength |
Yield Strength (0.2%) |
Elongation % |
Hardness |
| Annealed (ASTM B446) |
≥ 827 MPa (120 ksi) |
≥ 414 MPa (60 ksi) |
≥ 30 |
≤ 287 HB |
| Solution Annealed |
830–1030 MPa |
415–655 MPa |
35–60 |
175–240 HB |
| At 540°C (1000°F) |
~690 MPa (100 ksi) |
~290 MPa (42 ksi) |
~40 |
— |
| At 650°C (1200°F) |
~550 MPa (80 ksi) |
~275 MPa (40 ksi) |
~45 |
— |
| At 870°C (1600°F) |
~310 MPa (45 ksi) |
~180 MPa (26 ksi) |
~60 |
— |
6. Corrosion Resistance — CPT / CCT Comparison
Inconel 625 demonstrates exceptional resistance to localized corrosion in chloride-bearing environments. The Critical Pitting Temperature (CPT) and Critical Crevice Temperature (CCT) values per ASTM G48 are compared below against common stainless steels and nickel alloys:
| Alloy |
UNS |
PREN |
CPT (°C) |
CCT (°C) |
Test Method |
| 316L SS |
S31603 |
24–28 |
15–20 |
< 0 |
ASTM G48 A/B |
| 904L SS |
N08904 |
34–38 |
40–50 |
20–25 |
ASTM G48 A/B |
| 254 SMO |
S31254 |
42–44 |
70–75 |
32–38 |
ASTM G48 A/B |
| Inconel 625 |
N06625 |
48–52 |
≥ 85 |
40–50 |
ASTM G48 A/B |
| Alloy C-276 |
N10276 |
65–70 |
> 100 |
50–60 |
ASTM G48 A/B |
The high PREN of Inconel 625, driven primarily by its elevated molybdenum (8.0–10.0%) and chromium (20.0–23.0%) content, ensures superior resistance to pitting and crevice corrosion in seawater, brine, and acidic chloride solutions. The alloy is virtually immune to chloride stress corrosion cracking (SCC) and intergranular attack, making it a premier choice for offshore, chemical processing, and flue gas desulfurization applications.
7. Material Characteristics
Broad Temperature Range: Maintains mechanical integrity from cryogenic -196°C (-320°F) to 1093°C (2000°F) with excellent creep and rupture resistance at elevated temperatures.
Superior Corrosion Resistance: Outstanding resistance to pitting, crevice corrosion, intergranular attack, and chloride SCC in oxidizing and reducing environments.
Non-Magnetic: Magnetic permeability ≤ 1.001, ideal for sensitive electronic instrumentation and applications where magnetic interference must be eliminated.
Excellent Weldability: Readily weldable via GTAW, GMAW, and SMAW processes — no post-weld heat treatment required in most cases. ERNiCrMo-3 filler recommended.
High Fatigue Strength: Superior fatigue resistance for dynamically loaded components in aerospace, marine, and industrial applications.
No Age Hardening Required: Solid-solution strengthened alloy eliminates the need for precipitation-hardening heat treatment, reducing fabrication time and cost.
Acid Resistance: Resists oxidizing and reducing acids including nitric, phosphoric, sulfuric, and hydrochloric acids across a wide concentration and temperature range.
Cryogenic Toughness: Retains excellent ductility and Charpy impact toughness at temperatures as low as -196°C (-320°F).
8. Product Image Gallery
9. Available Forms
| Form |
Size Range |
Surface Finish |
Standard |
| Round Bar |
φ6 – φ500 mm |
Black / Peeled / Polished |
ASTM B446 |
| Flat Bar |
Thickness 5–100 mm, Width 20–300 mm |
Machined / Peeled |
ASTM B446 |
| Square Bar |
10 * 10 – 200 * 200 mm |
Peeled / Polished |
ASTM B446 |
| Hexagonal Bar |
6 – 100 mm (Across Flats) |
Peeled / Polished |
ASTM B446 |
| Forged Block |
Custom Dimensions |
As-Forged / Machined |
Per Customer Spec |
10. Typical Applications
| Aerospace |
Jet engine ducting, exhaust systems, thrust reverser components, turbine shroud rings, honeycomb seals, and spray bars |
| Marine & Subsea |
Valve stems, fasteners, pump shafts, mooring cables, subsea manifold components, and seawater piping |
| Chemical Processing |
Heat exchangers, reaction vessels, distillation columns, acid-handling piping, and flue gas desulfurization scrubbers |
| Oil & Gas |
Downhole tubing, wellhead components, flare booms, sour gas processing equipment, and subsea tree hardware |
| Nuclear |
Reactor core components, control rod drive mechanisms, waste vitrification systems, and spent fuel handling |
| Power Generation |
Gas turbine hot-section components, boiler tubes, superheater tubing, and waste-to-energy plant components |
11. DINGSCO — Professional Nickel Alloy Manufacturer
DINGSCO — Your Trusted Nickel Alloy Partner
DINGSCO is a premier manufacturer and supplier of high-performance nickel alloy forging products, serving global customers across aerospace, marine, chemical processing, oil & gas, nuclear, and power generation industries. With decades of metallurgical expertise, we deliver consistently superior nickel alloy bars, forgings, and customized components.
QUALITY ASSURANCE:
Our mission is to provide our customers only with the best quality products. As an ISO 9001:2015, PED 2014/68/EC, and API 6A certified manufacturer, we enforce strict quality control at every production stage — from raw material inspection and in-process monitoring to final ultrasonic testing and dimensional verification. Every shipment is accompanied by full Mill Test Reports (MTR) and material certifications per ASTM B446 / AMS 5666.
ISO 9001:2015 PED 2014/68/EC API 6A
SCIENCE AND TECHNOLOGY INNOVATION STRATEGY:
We pay close attention to customer needs, implement product innovation, and further leverage our company's full range of product types and material grades to provide customers with one-stop service. We pursue continuous improvement through material research, process optimization, and equipment upgrades.
COOPERATION:
We are pleased to help others and glad to acquire the hand of others. We actively participate in team meetings and support decision-making. We share our experience with each other and excel at cooperating with different types of colleagues across global markets.
12. Material Selection — Other Nickel Alloys Available
DINGSCO maintains a comprehensive inventory of nickel alloy grades to meet diverse application requirements. In addition to Inconel 625, we supply:
Inconel 600UNS N06600
High-temp oxidation resistance
Furnace & heat treat components
Inconel 601UNS N06601
Excellent carburization resistance
Thermal processing equipment
Inconel 718UNS N07718
Age-hardenable, highest strength
Aerospace gas turbine components
Incoloy 825UNS N08825
General corrosion resistance
Chemical & acid processing
DingscoK-500UNS N05500
High strength, seawater resistant
Marine fasteners & pump shafts
Hastelloy C-276UNS N10276
Extreme wet corrosion resistance
Severe chemical environments
Alloy 400UNS N04400
Seawater & HF acid resistant
Marine & chemical piping
Incoloy 925UNS N09925
Age-hardenable, H2S resistant
Sour gas wellhead equipment
Nimonic 80AUNS N07080
Creep resistant up to 815°C
Gas turbine blades & bolts
13. Customized Products
DINGSCO offers comprehensive customization services to meet your exact specifications:
- Custom Dimensions: Non-standard diameters, lengths, and cross-sectional profiles machined to your drawings
- Precision Machining: CNC turning, milling, grinding, and drilling of forged bar stock for ready-to-assemble components
- Cut-to-Length Service: Precision saw cutting with ±0.5 mm tolerance
- Special Surface Finishes: Centerless grinding, bright polishing, and peel turning available
- Non-Destructive Testing: Ultrasonic testing (UT) per AMS 5666, liquid penetrant inspection (LPI), and positive material identification (PMI) per customer requirements
- Custom Packaging: Bar-end protection, rust-preventive coating, and export-grade crating tailored to destination and handling requirements
- Expedited Delivery: Priority production scheduling for urgent project timelines
Contact DINGSCO today for a competitive quote on Inconel 625 forging bar — we respond to all inquiries within 24 hours.
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