HIGH NICKEL • CORROSION RESISTANT • INDUSTRIAL FASTENERS
Hastelloy C276 Threaded Fasteners
ASTM B574 Material Basis | UNS N10276 | W.Nr. 2.4819
Hastelloy C276 threaded fasteners for severe corrosive environments, including chemical processing, pollution control, petrochemical and sour oilfield service. Aanuraj supplies hex bolts, full threaded studs, hex nuts and washers in metric and inch sizes, with custom dimensions and material traceability.
Nickel-Molybdenum-Chromium Alloy
Excellent Pitting Resistance
Crevice Corrosion Resistance
SCC / SSC Resistance
MTC Available
Hastelloy C276 Nomenclature & Identification
HASTELLOY C-276Commercial alloy designation; HASTELLOY is a Haynes International trademark.
UNS N10276Unified Numbering System identification for C-276.
W.Nr. 2.4819Werkstoff number commonly associated with C-276.
NiMo16Cr15WDIN 17744 designation listed for the alloy.
ASTM B574 is a material specification for low-carbon nickel-chromium-molybdenum alloy rod/bar, including UNS N10276. Finished fastener geometry and dimensional tolerances are specified separately by the applicable fastener standard, drawing or customer specification.
Material Key Features
Broad Corrosion ResistanceHigh chromium and molybdenum support resistance in oxidizing and non-oxidizing chemical environments.
Localized CorrosionStrong resistance to pitting and crevice attack, especially in chloride-bearing service.
SCC / Sour ServiceHigh resistance to stress corrosion cracking and sulfide stress cracking in demanding environments.
Low C & SiVery low carbon and silicon contents support weldability and corrosion performance.
Chemical Composition — UNS N10276
| Element | Requirement, wt.% | Element | Requirement, wt.% |
|---|---|---|---|
| Nickel | Balance | Chromium | 14.5 - 16.5 |
| Molybdenum | 15.0 - 17.0 | Tungsten | 3.0 - 4.5 |
| Iron | 4.0 - 7.0 | Cobalt | 2.5 max. |
| Carbon | 0.01 max. | Silicon | 0.08 max. |
| Manganese | 1.0 max. | Vanadium | 0.35 max. |
| Copper | 0.5 max. | Phosphorus / Sulfur | 0.04 / 0.03 max. |
Composition limits above are based on ASTM B574-23 for UNS N10276. Always verify the applicable purchase specification and MTC for the supplied fastener.
Mechanical & Physical Reference Data
| Property | Reference Value | Basis |
|---|---|---|
| Tensile strength, minimum | 690 MPa (100 ksi) | ASTM B574, solution-annealed rod/bar |
| Yield strength, 0.2% offset, minimum | 283 MPa (41 ksi) | ASTM B574, solution-annealed rod/bar |
| Elongation, minimum | 40% | ASTM B574, solution-annealed rod/bar |
| Density, typical | 8.89 g/cm3 | Typical alloy reference |
| Elastic modulus, typical | 205 GPa | Typical alloy reference |
| Thermal conductivity, typical | 9.8 W/m·K | Typical alloy reference |
Solution Annealing & Quenching
Anneal2050 °F / 1121 °C, with ±25 °F / 14 °C guidance.
HoldTypically 10-30 minutes after the full section reaches annealing temperature, depending on thickness.
QuenchWater quench preferred; rapid air cooling can be feasible for sections below 10 mm / 0.375 in.
Re-AnnealRecommended after hot forming and after cold forming producing outer-fiber elongation of 7% or more.
Fastener Dimensions & Standards — Metric & Inch
| Product | Metric dimensional reference | Inch dimensional reference | Typical range shown for catalogue planning |
|---|---|---|---|
| Hex Bolts / Hex Screws | ISO 4014 / ISO 4017; DIN 931 / DIN 933 | ASME B18.2.1 | Metric M8-M64; inch 1/4"-2.5" by drawing/availability |
| Full Threaded Studs | DIN 938 / DIN 939; ASME B18.31.2 where applicable | ASME B18.31.2 / customer drawing | Metric M8-M48; inch 3/8"-2.5" by requirement |
| Hex Nuts | ISO 4032 / DIN 934 | ASME B18.2.2 | Metric M8-M48; inch 1/4"-3" by requirement |
| Plain Washers | ISO 7089 / DIN 125 | ASME B18.21.1 | Metric M8-M48; inch 1/4"-3" by requirement |
Metric Thread Pitch Reference
| Size | Coarse pitch, mm | Size | Coarse pitch, mm | Size | Coarse pitch, mm |
|---|---|---|---|---|---|
| M8 | 1.25 | M10 | 1.50 | M12 | 1.75 |
| M14 | 2.00 | M16 | 2.00 | M18 | 2.50 |
| M20 | 2.50 | M22 | 2.50 | M24 | 3.00 |
| M27 | 3.00 | M30 | 3.50 | M36 | 4.00 |
| M42 | 4.50 | M48 | 5.00 | M64 | 6.00 |
Inch Thread Reference
| Nominal | Common UNC | Common UNF | Typical use |
|---|---|---|---|
| 1/4" | 20 TPI | 28 TPI | Bolts / studs / nuts |
| 5/16" | 18 TPI | 24 TPI | Bolts / studs / nuts |
| 3/8" | 16 TPI | 24 TPI | Bolts / studs / nuts |
| 1/2" | 13 TPI | 20 TPI | Bolts / studs / nuts |
| 5/8" | 11 TPI | 18 TPI | Bolts / studs / nuts |
| 3/4" | 10 TPI | 16 TPI | Bolts / studs / nuts |
| 1" | 8 TPI | 12 TPI | Bolts / studs / nuts |
| 1-1/4" | 7 TPI | 12 TPI | Heavy industrial fastening |
| 1-1/2" | 6 TPI | 12 TPI | Heavy industrial fastening |
| 2" | 4-1/2 TPI | 8 TPI | Heavy industrial fastening |
Dimensions and thread series are reference standards for product design. Exact head, nut, washer and thread dimensions depend on the selected standard, size, thread form, length and drawing. ASTM B574 itself is a material specification for C276 rod/bar, not a universal finished-fastener dimensional standard.
Applications & Industries
Chemical ProcessingReactors, columns, heat exchangers, piping and aggressive chemical service.
Oil & GasSour environments, chloride-bearing service and critical bolted joints.
Pollution ControlFlue-gas, scrubber and waste-treatment equipment requiring corrosion resistance.
Marine / Process EquipmentChloride-rich environments, pumps, valves, flanges and equipment assemblies.
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Why Aanuraj Fasteners
Material ExpertiseExperience with stainless steel, duplex, super duplex and high-nickel fastener grades.
Custom ManufacturingCustom diameters, lengths, thread forms and configurations to drawing or specification.
TraceabilityMTC and inspection documentation available as required by the project.
Technical SupportApplication-focused support for material selection, dimensions and critical bolting requirements.
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Technical Enquiry
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