Hastelloy Fasteners Manufacturer & Global Exporter in India
Neelkamal Alloys LLP is a premier manufacturer, stockist, and global exporter of high-grade Hastelloy Fasteners based in Mumbai, India. We produce precision-engineered Hastelloy C276, Hastelloy C22, Hastelloy B2, and Hastelloy B3 bolts, stud bolts, heavy hex nuts, screws, and washers in compliance with international ASTM, ASME, DIN, and ISO standards. Designed specifically for hostile operating conditions, our Hastelloy fasteners deliver exceptional resistance to localized pitting, stress-corrosion cracking, and aggressive oxidizing/reducing acids.
Why EPC Contractors & Global Buyers Trust Our Hastelloy Fasteners
Industrial process plants operating under high temperatures and handling concentrated mineral acids (hydrochloric, sulfuric, phosphoric) require severe-duty bolting solutions. Standard stainless steel and duplex alloys suffer rapid corrosion or catastrophic failure in such environments. Our Hastelloy fasteners provide verified chemical stability, heat resistance up to 1040°C (1900°F), and 100% heat-number material traceability certified under EN 10204 3.1.
Key Hastelloy Alloys & Equivalent Material Grades
We manufacture custom drawing-based parts as well as standard dimension fasteners in the following Hastelloy grade matrix:
| Grade / Trade Name | UNS Number | EN / W.Nr. | Key Metallurgical Characteristic |
|---|---|---|---|
| Hastelloy C276 | UNS N10276 | 2.4819 | Versatile Ni-Cr-Mo alloy with supreme resistance to wet chlorine gas, ferric/cupric chlorides, and strong oxidizers. |
| Hastelloy C22 | UNS N06022 | 2.4602 | Superior pitting and crevice corrosion resistance in mixed chemical streams compared to C276. |
| Hastelloy B2 | UNS N10665 | 2.4617 | Nickel-molybdenum alloy tailored for extreme resistance to pure hydrochloric acid at all concentrations and temperatures. |
| Hastelloy B3 | UNS N10675 | 2.4600 | Enhanced thermal stability over B2 with outstanding resistance to pitting and stress-corrosion cracking. |
| Hastelloy C2000 | UNS N06200 | 2.4675 | Copper-added Ni-Cr-Mo alloy offering dual resistance to both oxidizing and reducing media. |
Hastelloy Fasteners Chemical Composition (% Weight)
The addition of high molybdenum, chromium, and tungsten content renders Hastelloy resistant to aggressive chemical environments:
| Alloy | Ni | Cr | Mo | Fe | W | Co | Mn | C (max) |
|---|---|---|---|---|---|---|---|---|
| C-276 | Balance | 14.5–16.5 | 15.0–17.0 | 4.0–7.0 | 3.0–4.5 | 2.5 max | 1.0 max | 0.010 |
| C-22 | Balance | 20.0–22.5 | 12.5–14.5 | 2.0–6.0 | 2.5–3.5 | 2.5 max | 0.5 max | 0.010 |
| B-2 | 65.0 min | 1.0 max | 26.0–30.0 | 2.0 max | — | 1.0 max | 1.0 max | 0.010 |
| B-3 | 65.0 min | 1.0–3.0 | 27.0–32.0 | 1.0–3.0 | 3.0 max | 3.0 max | 3.0 max | 0.010 |
Manufacturing Standards & Dimension Specifications
Our Hastelloy bolting components are crafted using CNC machining and hot/cold forging facilities under rigid quality tolerances:
| Product Category | Dimensional Standards | Size Range |
|---|---|---|
| Hastelloy Hex Bolts & Heavy Hex Bolts | ASME B18.2.1, DIN 931, DIN 933, ISO 4014, ISO 4017 | M3 – M100 | 1/4" – 4" Dia | Lengths up to 1500 mm |
| Hastelloy Stud Bolts & Threaded Rods | ASME B16.5, ASME B18.31.2, DIN 975, DIN 976 | M6 – M120 | 1/4" – 4.5" Dia | Cut-to-length & Continuous thread |
| Hastelloy Hex Nuts & Heavy Hex Nuts | ASME B18.2.2, DIN 934, ISO 4032, ASME B18.16.6 | M3 – M100 | 1/4" – 4" Dia |
| Hastelloy Washers (Flat, Spring, Lock) | ASME B18.21.1, DIN 125, DIN 127, DIN 9021 | M3 – M100 | 1/4" – 4" Inside Diameter |
| Hastelloy Socket Head Cap Screws | ASME B18.3, DIN 912, ISO 4762 | M2 – M64 | #2 – 2" Dia |
Hastelloy C276 Hex Bolt Dimensional Chart (ASME B18.2.1 / Metric)
| Nominal Size (D) | Width Across Flats (F) Max/Min (mm) | Head Thickness (H) Max/Min (mm) | Body Diameter (D) Max/Min (mm) | Across Corners (C) Min (mm) |
|---|---|---|---|---|
| M12 | 19.00 / 17.73 | 7.76 / 7.24 | 12.00 / 11.73 | 20.03 |
| M16 | 24.00 / 23.67 | 10.32 / 9.68 | 16.00 / 15.73 | 26.75 |
| M20 | 30.00 / 29.16 | 12.88 / 12.12 | 20.00 / 19.67 | 32.95 |
| M24 | 36.00 / 35.00 | 15.44 / 14.56 | 24.00 / 23.67 | 39.55 |
| M30 | 46.00 / 45.00 | 19.48 / 17.92 | 30.00 / 29.67 | 50.85 |
| M36 | 55.00 / 53.80 | 23.38 / 21.63 | 36.00 / 35.61 | 60.79 |
| M48 | 75.00 / 72.60 | 31.07 / 28.93 | 48.00 / 47.38 | 82.76 |
Reference Indicative Price Range for Hastelloy Fasteners
Due to raw material market fluctuations, prices vary depending on order size, special thread forms, and custom coatings (such as PTFE/Xylan). Below is an indicative wholesale buyer reference list:
| Fastener Item Description | Specification / Grade | Reference Price (USD / Piece) |
|---|---|---|
| Hastelloy Hex Head Bolt | Alloy C276 M12 x 50mm | $6.20 |
| Hastelloy Machine Bolt | Alloy C22 M10 x 40mm | $5.40 |
| Hastelloy Socket Head Cap Screw | Alloy C276 M8 x 30mm | $3.20 |
| Hastelloy Hex Nut | Alloy C276 M12 Heavy Hex | $1.30 |
| Hastelloy Allen Bolt | Alloy B2 M10 x 35mm | $5.10 |
Primary Industrial Applications
Our export-grade Hastelloy fasteners are specified by plant engineers across critical process industries:
- Chemical & Petrochemical Processing: Reactor vessels, heat exchangers, pumps, valves, and acid piping systems handling sulfuric, acetic, and formic acids.
- Flue Gas Desulfurization (FGD): Scrubber systems, duct liners, and stack absorbers exposed to aggressive acidic gas vapors.
- Pharmaceutical & Biotechnology: High-purity process vessels and solvent extraction units requiring non-contaminating alloy joints.
- Pulp & Paper Production: Bleach plant equipment, chlorine dioxide digesters, and washer towers.
- Offshore Oil & Marine Engineering: Subsea wellheads, sour gas (H2S) processing units, and high-salinity brine evaporators.
Quality Assurance & Export Testing Protocol
Every production lot at Neelkamal Alloys LLP undergoes exhaustive quality inspection to satisfy international buyer compliance requirements:
- Positive Material Identification (PMI): XRF spectrographic analysis verifying exact elemental composition before machining.
- Dimensional Inspection: Go/No-Go thread gauge testing, micro-caliper checks, and pitch diameter verification.
- Mechanical Testing: Tensile strength, yield proof load, hardness (HRB/HRC), and elongation testing.
- Mill Test Certification: Fully traceable EN 10204 3.1 MTC supplied with every export shipment.
- Third-Party Inspection: Available on buyer request through TUV, Bureau Veritas, SGS, Lloyd's Register, or DNV.
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