Nickel Alloy
Fasteners Manufacturer
Mumbai · India
What Are Nickel Alloy Fasteners
Stainless and duplex steels are, at their core, iron-based alloys with chromium, nickel, and molybdenum added to improve corrosion resistance. Nickel alloys flip that relationship — nickel is the base, not the addition — and that difference matters. Nickel can hold far higher levels of chromium and molybdenum in solid solution than iron can, which is precisely why nickel-base alloys can survive environments that would rapidly consume even the most resistant iron-based stainless steels: strongly reducing acids, sour gas with high H2S content, chlorides at elevated temperature, and sustained service well above 500°C.
There isn’t one “nickel alloy” — there are four distinct families, each built around a different base chemistry and a different problem: Inconel (nickel-chromium, for high-temperature strength and oxidation resistance), Incoloy (nickel-iron-chromium, a cost-effective step up from stainless for sour service and heat), Monel (nickel-copper, for seawater and hydrofluoric acid), and Hastelloy (nickel-molybdenum-chromium, for the most severe acid environments, whether reducing, oxidizing, or both).
Akbar Fasteners Pvt. Ltd. exports to over 50 countries, and our nickel alloy range — including our established Hastelloy B-3 stud bolt line — is manufactured with the same ISO 9001:2015 quality system and full mill test documentation as our stainless and duplex range.
Where Nickel Alloys Genuinely Earn Their Cost
Corrosion Resistance Beyond Stainless
Nickel’s higher solubility for chromium and molybdenum enables resistance in reducing acids, chlorides, and sour environments that consume even 316 or super duplex steel over time.
High-Temperature Strength Retention
Families like Inconel retain useful mechanical strength at temperatures where stainless steel has already lost much of its load-bearing capability.
Sour Service Familiarity
NACE MR0175/ISO 15156 material selection considerations for onshore and offshore oil & gas fastening in H2S-containing environments.
A Family for Every Chemistry
Rather than one compromise alloy, four distinct families let you match the fastener to the actual acid, temperature, or chloride environment in question.
Inconel vs Incoloy vs Monel vs Hastelloy
“Nickel alloy” is a category, not a specification — and treating it as one is how the wrong material ends up in the wrong environment. Each family was developed to solve a different corrosion or high-temperature problem, and the right choice depends entirely on what the fastener will actually be exposed to. The comparison below is the one we walk through with buyers before quoting, so the family selection matches the real service condition.
| Property | Inconel | Incoloy | Monel | Hastelloy |
|---|---|---|---|---|
| Primary Base Chemistry | Nickel-Chromium | Nickel-Iron-Chromium | Nickel-Copper | Nickel-Molybdenum-Chromium |
| Best Suited For | High-temperature strength & oxidation resistance | Cost-effective sour service & heat | Seawater & hydrofluoric acid | Most severe reducing/oxidizing acids |
| Typical Max Service Temp | Very high (1000°C+ short-term) | High (~800–1100°C for some grades) | Moderate | Moderate-High, chemistry dependent |
| Representative Grades | 625, 718, 600 | 825, 800/800H/800HT | 400, K-500 | B-3, C-276, C-22 |
| Typical Application | Aerospace, gas turbines, high-temp fastening | Heat exchangers, sour gas piping | Marine hardware, HF alkylation units | Chemical processing, reducing acid service |
| Relative Material Cost | High | Moderate | Moderate-High | Highest |
Nickel Alloy Fastener Range
Inconel Fasteners
Grades 625, 718, 600 — high-temperature strength and oxidation resistance for aerospace and gas turbine service.
Nickel-Iron-ChromiumIncoloy Fasteners
Grades 825, 800/800H/800HT — cost-effective sour service and elevated-temperature fastening.
Nickel-CopperMonel Fasteners
Grades 400, K-500 — seawater and hydrofluoric acid resistant marine and chemical hardware.
Nickel-Molybdenum-ChromiumHastelloy Fasteners
Grade B-3 (UNS N10675) — reducing acid and severe chemical processing service.
Nickel Alloy Technical Overview
Typical Alloying Elements by Family
- Inconel Ni-Cr, +Mo/Nb in some grades
- Incoloy Ni-Fe-Cr, ~30-46% Ni
- Monel ~63-70% Ni, ~28-34% Cu
- Hastelloy Ni-Mo-Cr, high Mo content
- Exact composition Grade-specific — see grade page
Property Ranges (family dependent)
- Tensile Strength 485–1000+ MPa
- Yield Strength 170–850+ MPa
- Elongation 25–50%, grade dependent
- Age-Hardenable Grades Available (e.g. K-500, 718)
- Testing MTC / NABL on request
Available Dimensions
- Metric Diameter M6 – M64
- Imperial Diameter 1/4″ – 4″
- Stud Length Custom to drawing
- Thread Type UNC / UNF / Metric
- Finish As-machined / Passivated
Application Areas
Wherever standard stainless or duplex steel reaches its limit.
Oil & Gas Sour Service
flange and process fastening
Chemical Processing
equipment fastening
Marine & Seawater Equipment
for sustained saltwater exposure
Aerospace & Gas Turbines
high-temperature fastening
Power Generation
process equipment fastening
Pulp & Paper Processing
equipment fastening
Pharmaceutical & Specialty Chemical
fastening applications
Desalination
fastening for RO/MSF plants
Standard Export Documentation
Prepared as standard practice for every nickel alloy shipment.
Mill Test Certificate (MTC)
Heat number, chemical composition, and mechanical property verification for every lot.
Certificate of Conformance
Confirms the shipment matches the purchase order specification and grade in full.
Certificate of Origin (COO)
Confirms India as country of manufacture for destination customs purposes.
Commercial Invoice & Packing List
Itemized value, Incoterm, and detailed carton/weight breakdown for customs clearance.
NABL Accredited Test Reports
Independent mechanical and chemical testing available on request for critical applications.
Bill of Lading
Ocean or air freight shipping document confirming carrier, mode, and consignee details.
Internationally Recognised Standards Coverage
Related Fastener Grades & Materials
Hastelloy B-3 Stud Bolts
Our established nickel-molybdenum alloy fastening line for reducing acid and severe corrosion service.
View Hastelloy B-3 →Super Duplex Fasteners
High strength and severe chloride resistance where nickel alloy properties aren’t strictly required.
View Super Duplex →Stainless Steel 316 Fasteners
The economical corrosion-resistant starting point before stepping up to a nickel alloy.
View SS 316 →ASTM A193 Grade B8T Fasteners
Titanium-stabilized stainless for high-temperature service where full nickel alloy isn’t needed.
View Grade B8T →Not Sure Which
Nickel Alloy You Need?
Tell us the environment — acid type, temperature, chlorides, or sour gas — and we’ll help you select the right family and grade. Akbar Fasteners Pvt. Ltd. responds within 24 hours.
Sales: +91 724 0000 733 · Support: +91 800 9315 333 · sales@akbarfasteners.in