Nickel Alloys Alloy 625 Fasteners Overview
Zeon Exports supplies Nickel Alloy 625 (Inconel, UNS N06625) fasteners – bolts, nuts and studs – a nickel-chromium-molybdenum superalloy with excellent corrosion and oxidation resistance from cryogenic temperatures up to 980°C, for oil & gas bolted joints.
Nickel Alloy 625 (Inconel) Fasteners secure bolted connections in sour-gas, high-temperature and highly corrosive process piping and equipment. Its nickel-chromium-molybdenum-niobium composition delivers excellent strength and resistance to pitting, crevice corrosion and oxidation across a very wide temperature range, making it a go-to choice where duplex and standard stainless grades fall short.
- Excellent strength and corrosion resistance from cryogenic to 980°C
- Tensile ≥827 MPa, yield ≥414 MPa in the annealed condition
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Nickel Alloys Alloy 625 Fasteners
Nickel Alloy 625 (Inconel) Fasteners are produced to internationally recognized bolting specifications.
| Field | Detail |
|---|---|
| Material/Grade | Nickel Alloy 625 (Inconel) |
| UNS | N06625 |
| DIN/Werkstoff Number | 2.4856 |
| Standards | ASTM B446 |
| Form | Bolts, Nuts, Studs |
| Finish | As specified (confirm on order) |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of Alloy 625
Alloy 625 (Inconel 625) is recognized under several international designations below.
| UNS | DIN/Werkstoff Number | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|
| N06625 | 2.4856 | Inconel 625 | ASTM B446 |
Chemical Composition of Alloy 625
Composition per ASTM B446 for UNS N06625; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Nickel (Ni), min | 58.0 |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Niobium + Tantalum (Nb+Ta) | 3.15 – 4.15 |
| Iron (Fe), max | 5.0 |
| Cobalt (Co), max | 1.0 |
| Manganese (Mn), max | 0.50 |
| Silicon (Si), max | 0.50 |
| Aluminum (Al), max | 0.40 |
| Titanium (Ti), max | 0.40 |
| Carbon (C), max | 0.10 |
Physical Properties of Nickel Alloy 625 (Inconel)
Physical properties for Inconel 625, confirmed against manufacturer data.
| Property | Value |
|---|---|
| Density | 8.4 g/cm3 |
| Melting Range | 1290 – 1350°C |
| Magnetic Behaviour | Essentially non-magnetic |
Mechanical Properties of Nickel Alloys Alloy 625 Fasteners
Minimum mechanical properties for annealed UNS N06625 per ASTM B446.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 827 MPa (120 ksi) |
| Yield Strength (0.2% offset) | 414 MPa (60 ksi) |
| Elongation | 30% |
| Hardness | 240 HB max (typical) |
| Condition | Annealed |
Corrosion Resistance of Nickel Alloy 625 (Inconel)
- Nickel Alloy 625 Fasteners resist both localized corrosion and high-temperature oxidation, a combination few alloys match.
- Pitting and crevice resistance: molybdenum and chromium give excellent resistance to chloride pitting and crevice attack.
- Oxidation resistance: forms a stable protective oxide layer for service up to 980°C.
- Sour-service resistance: resists stress corrosion cracking in hydrogen sulfide environments above 150°C.
Heat Resistance of Nickel Alloy 625 (Inconel)
Nickel Alloy 625 fasteners retain useful strength and oxidation resistance up to roughly 980°C (1,800°F), with the annealed (Grade 1) condition rated for structural use up to about 593°C and the higher-temperature solution-annealed (Grade 2) condition suited to superior creep resistance. Confirm the correct grade and exact limits against the governing standard.
Key Properties of Nickel Alloys Alloy 625 Fasteners
Beyond corrosion and heat performance, Inconel 625 fasteners offer these additional properties.
- Good weldability with matching filler metal, minimal post-weld treatment needed
- High fatigue and creep strength at elevated temperatures
- Good machinability using appropriate tooling for nickel alloys
- Excellent toughness maintained at cryogenic temperatures
Benefits of Nickel Alloys Alloy 625 Fasteners
Choosing Inconel 625 fasteners from Zeon Exports delivers measurable advantages for your project.
- Broadest temperature and corrosion-resistance range in the nickel alloy family
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple sizes, threads and finishes to match exact project specs
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
Related Products
Explore related Nickel Alloy products from Zeon Exports.
Request a Quote for Nickel Alloys Alloy 625 Fasteners
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Call: +91 98205 33105
Email: info@zeonexports.com
Website: www.zeonexports.com
Address: A-7/9, Saboo Building, Ardeshir Dady Cross Lane, Cawasji Patel Tank Road, Mumbai – 400004
Frequently Asked Questions About Nickel Alloys Alloy 625 Fasteners
Common questions about Nickel Alloy 625 (Inconel) Fasteners, answered below.
Q1: What is Nickel Alloy 625 (Inconel)?
Ans. Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum superalloy with a minimum 58% nickel content.
Q2: Which fastener types are available in Inconel 625?
Ans. We supply bolts, nuts and studs manufactured to ASTM B446 across standard thread sizes and lengths.
Q3: What standards do Inconel 625 fasteners meet?
Ans. Fasteners are manufactured to ASTM B446, certified to EN 10204 3.1 mill test certificates.
Q4: What is the maximum service temperature?
Ans. Inconel 625 retains useful oxidation resistance up to roughly 980°C; confirm the correct grade against your design code.
Q5: Is Inconel 625 magnetic?
Ans. Inconel 625 is essentially non-magnetic, being an austenitic nickel-based alloy.
Q6: Is Inconel 625 suitable for sour-gas service?
Ans. Yes, Inconel 625 resists stress corrosion cracking in hydrogen sulfide environments above 150°C.
Q7: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q8: Does Zeon Exports supply custom sizes?
Ans. Yes, fasteners are available in custom thread sizes and lengths on request for bulk industrial orders.
