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Hastelloy B2 / B3 Threaded Bars Overview
Aurum Overseas is a trusted Hastelloy B2 and Hastelloy B3 Threaded Bars Supplier & Exporter, stocking high-molybdenum nickel fasteners made to ASTM B335 specifications. Engineered for severe chemical service, these studs deliver exceptional resistance to pure hydrochloric, sulfuric, and acetic acids.
Our inventory includes high-purity UNS N10665 Threaded Rods containing 26–30% Molybdenum for maximum corrosion protection in reducing acid solutions. For enhanced thermal stability, our UNS N10675 Threaded Rods prevent structural embrittlement during welding and heat treatment.
Built for alkylation units, acetic acid reactors, and chemical distillation towers, our full-thread studs maintain leak-free joint seals. Contact Aurum Overseas for factory quotes, custom length sawing, and fast global shipping.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B335, ASME SB335, EN 10204 3.1 |
| UNS Designations | UNS N10665 (Hastelloy B2) / UNS N10675 (Hastelloy B3) |
| Thread Size Range | M6 to M100 (1/4" to 4.0" Nominal Diameter) |
| Thread Profiles | UNC, UNF, UNEF, Metric Coarse, Metric Fine, Acme Threads |
| Length Options | 1,000 mm, 2,000 mm, 3,000 mm, Custom Cut-to-Length All-Thread Studs |
| Thread Class / Fit | Class 2A / 3A (Imperial) & 6g / 6h (Metric Profile Tolerances) |
| HSN Code | 75089090 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | Standard | W.Nr. | UNS |
|---|---|---|---|
| Hastelloy B2 | ASTM B335 | 2.4617 | N10665 |
| Hastelloy B3 | ASTM B335 | 2.4600 | N10675 |
Chemical Composition (%)
| Chemical Element | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Nickel (Ni) | Balance | 65.0 min |
| Molybdenum (Mo) | 26.00 – 30.00 | 28.5 typ |
| Chromium (Cr) | 1.00 max | 1.50 max |
| Iron (Fe) | 2.00 max | — |
| Manganese (Mn) | 1.00 max | 3.00 max |
| Silicon (Si) | 0.10 max | 0.10 max |
| Cobalt (Co) | 1.00 max | — |
| Carbon (C) | 0.020 max | 0.010 max |
| Phosphorus (P) | 0.040 max | — |
| Sulfur (S) | 0.030 max | — |
Mechanical & Physical Properties
| Property Parameter | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Density | 9.20 g/cm³ | 9.22 g/cm³ |
| Melting Point | 1370 °C (2500 °F) | 1418 °C |
| Tensile Strength (Min) | 760 MPa (110,000 Psi) | 1000 – 2000 MPa |
| Yield Strength (0.2% Offset, Min) | 350 MPa (51,000 Psi) | — |
| Elongation (Min) | 40 % | — |
| Modulus of Elasticity | — | 216 GPa |
Key Advantages of Hastelloy B2 / B3 Threaded Rods
Exceptional Hydrochloric Acid Resistance
High Molybdenum alloy matrix delivers outstanding protection against pure hydrochloric acid across all concentrations and temperatures.
Superior Thermal Stability
Alloy B3 offers improved structural stability, resisting intermetallic phase precipitation during welding and stress-relieving cycles.
Resists Pitting & Stress Corrosion Cracking
High Nickel content prevents stress-corrosion cracking and localized pitting in non-oxidizing acid services.
Smooth & Secure Threading
Precision roll-threaded construction prevents thread stripping and jamming under high torque assembly.
Quality Testing & Inspection
Aurum Overseas subjects every order to strict quality control processes to ensure compliance with international fastener standards and client specifications:
- Chemical Heat Verification (PMI): Spectro / XRF material analysis verifying exact elemental chemistry against ASTM standards.
- Thread Pitch & Gage Inspection: Go/No-Go thread gage and optical comparator testing ensuring class 2A/3A and 6g pitch tolerances.
- Mechanical Property Certification: Factory batch verification of tensile, yield strength, and elongation supported by EN 10204 3.1 MTRs.
- Optional Third-Party Testing: Intergranular corrosion testing (ASTM G28), Proof Load testing, or Ultrasonic NDT provided upon request.
Global Export Markets
As an established Hastelloy B2 & B3 Threaded Bars Exporter, Aurum Overseas supplies fully certified ASTM B335 UNS N10665 / N10675 threaded rods to global chemical processing, petrochemical, and high-corrosion industrial facilities:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
Hastelloy B3 (UNS N10675) offers superior thermal stability over B2 (UNS N10665), preventing embrittlement and maintaining ductility after welding.
No. Because B-series alloys contain minimal Chromium (1.0–1.5% max), they are strictly designed for reducing acids and will corrode in oxidizing media or ferric salts.
They are primarily used in chemical plants handling pure hydrochloric acid, acetic acid synthesis, formic acid, and catalyst recovery units.
Yes. We regularly export to the UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain for use in regional petrochemical and acid production facilities.
Yes. Facilities across the USA, Canada, Germany, the UK, and the Netherlands rely on our B2/B3 studs for high-temperature acid processing.
Contact Aurum Overseas
Contact Aurum Overseas, a trusted Hastelloy B2 & B3 Threaded Bars Supplier & Exporter, for certified high-nickel alloy threaded rods, custom length sawing, and fast international delivery.