Table of Contents
- Hastelloy Fasteners Overview
- Hastelloy Fasteners Specifications
- What are Hastelloy B2 / B3 Nuts?
- Hastelloy Fasteners Technical Properties & Composition
- Why Industries Prefer Hastelloy B2 / B3 Nuts
- Types of Hastelloy B2 / B3 Nuts
- Key Advantages of Hastelloy B2 / B3 Nuts
- Key Applications of Hastelloy B2 / B3 Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Hastelloy B2 / B3 Nuts Suppliers & Exporters
Aurum Overseas is a premier Hastelloy B2 / B3 Nuts Supplier and Hastelloy B2 / B3 Nuts Exporter, supplying nickel-molybdenum fasteners engineered specifically for pure, highly reducing chemical environments.
Manufactured to meet ASTM B572 UNS N10665 Nuts and ASTM B572 UNS N10675 Nuts specifications, these specialized high-nickel components deliver exceptional resistance against pure hydrochloric acid, hydrobromic acid, aluminum chloride catalysts, and concentrated sulfuric acid across all temperature ranges.
As a worldwide Hastelloy B2 / B3 Nuts Exporter, Aurum Overseas distributes fully tested and traceable bolting materials across North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy, Netherlands, Norway), the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman), and Asia-Pacific (Singapore, Malaysia, Australia).
Hastelloy Fasteners Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grade | Hastelloy B2 / Hastelloy B3 / Alloy B2 / Alloy B3 |
| UNS Number | UNS N10665 (B2) / UNS N10675 (B3) |
| Werkstoff Number | 2.4617 (B2) / 2.4600 (B3) |
| Common Trade Names | Hastelloy B-2 / Hastelloy B-3 / N10665 / N10675 |
| Manufacturing Standards | ASTM B572, ASME SB572, DIN 934, ISO 4032, ANSI B18.2.2 |
| Size Range | M3 to M100 | 3/16" to 4" | Custom Dimensions |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF, 8UN) & B1.13M Metric |
| Nut Formats | Hex Head, Heavy Hex, Square, Lock, Slotted, Coupling, Flange Nuts |
| Testing Standards | ASTM E8, SAE J411, EN 14399, ASME B1.2, ISO 7090, DIN 125 |
What are Hastelloy B2 / B3 Nuts?
UNS N10665 / N10675 Nuts are solid-solution nickel-molybdenum alloy fasteners designed for pure reducing acid service where chromium-containing alloys fail.
While ASTM B572 UNS N10665 Nuts feature a high molybdenum chemistry (26.0% to 30.0%) for resistance against pure hydrochloric gas and liquid streams, ASTM B572 UNS N10675 Nuts are refined with controlled iron and chromium additions to improve thermal stability, eliminating the micro-structural embrittlement and stress cracking issues seen during post-weld fabrication of earlier B-type alloys.
Hastelloy Fasteners Technical Properties & Composition
Chemical Composition of Hastelloy B2 / B3 Nuts (%)
| Element | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Nickel (Ni) | 65.0 min (Balance) | 65.0 min (Balance) |
| Molybdenum (Mo) | 26.0 – 30.0 | 28.5 avg |
| Iron (Fe) | 2.0 max | 1.5 max |
| Chromium (Cr) | 1.0 max | 1.5 max |
| Cobalt (Co) | 1.0 max | 3.0 max |
| Manganese (Mn) | 1.0 max | 3.0 max |
| Carbon (C) | 0.02 max | 0.01 max |
| Silicon (Si) | 0.10 max | 0.10 max |
| Aluminum (Al) | — | 0.50 max |
| Titanium (Ti) | — | 0.20 max |
Physical & Thermal Properties of Hastelloy B2 / B3
| Property / Parameter | Hastelloy B2 (N10665) | Hastelloy B3 (N10675) |
|---|---|---|
| Density (g/cm³) | 9.22 | 9.22 |
| Melting Range (°C / °F) | 1325 – 1375 / 2417 – 2507 | 1418 / 2585 |
| Tensile Strength (MPa / ksi) | 760 – 895 / 110 – 130 | 1000 – 2000 / 145 – 290 |
| Yield Strength (0.2% Offset, MPa / ksi) | 345 – 400 / 50 – 58 | 425 – 1260 / 62 – 183 |
| Elongation (%) | 40 min | 57 |
| Hardness (HRB) | 88 – 96 | 95 avg |
Equivalent Grade Standards
| Grade | Standard | Werkstoff Nr. | UNS | EN / ISO | JIS |
|---|---|---|---|---|---|
| Hastelloy B2 | ASTM B572 | 2.4617 | N10665 | NiMo28 | NW 0665 |
| Hastelloy B3 | ASTM B572 | 2.4600 | N10675 | NiMo29Cr | NW 0675 |
Why Industries Prefer Hastelloy B2 / B3 Nuts
Chemical engineers select Hastelloy B2 / B3 Nuts for operations using non-oxidizing acids, where chromium-bearing materials suffer severe uniform attack.
As an expert Hastelloy B2 / B3 Nuts Supplier, Aurum Overseas guides customers toward the right selection: B2 is a proven standard for static, non-welded or as-annealed assemblies, while B3 offers improved structural ductility during hot-forming, welding, and thermal cycling.
Types of Hastelloy B2 / B3 Nuts
Aurum Overseas supplies a comprehensive range of Hastelloy B2 / B3 nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
Hastelloy B2 / B3 Hex Head Nuts
Hastelloy B2 / B3 Square Nuts
Hastelloy B2 / B3 Lock Nuts
Hastelloy B2 / B3 Eye Nuts
Hastelloy B2 / B3 Wing Nuts
Hastelloy B2 / B3 T Nuts
Hastelloy B2 / B3 Panel Nuts
Hastelloy B2 / B3 Coupling Nuts
Hastelloy B2 / B3 Dome Nuts
Key Advantages of Hastelloy B2 / B3 Nuts
Resistance to Pure Hydrochloric Acid
Handles full concentrations of non-oxidizing hydrochloric acid at high temperatures.
Thermal Stability in Grade B3
Improved chemistry prevents harmful intermetallic precipitate phases during heat treatment.
Pitting Resistance in Pure Acid Solutions
Ultra-high molybdenum content safeguards fastener body from localized acid attack.
Ductility under Mechanical Strain
High percentage elongation maintains joint integrity under severe vibration and piping stress.
Low Carbon Content
Ultra-low carbon prevents intergranular grain boundary sensitization during thermal exposure.
Key Applications of Hastelloy B2 / B3 Nuts
| Industry Sector | Primary Fastener Application | Key Service Environment |
|---|---|---|
| Acid Synthesis Plants | Reboiler flanges, vaporizer tower piping | Hot pure hydrochloric acid vapor and concentrated acid solutions |
| Petrochemical Refining | Isomerization unit reactor bolting | Strong acid catalyst systems containing liquid hydrogen chloride |
| Fine Chemicals | Specialty synthesis vessels, acid recovery lines | Highly reducing organic acids, formic acid, and acetic acid distillation |
| Agrochemical Manufacturing | Fertilizer synthesis equipment, pickling tanks | Hydrobromic acid condensation zones and pure halogenated liquid streams |
Quality Testing & Inspection
Aurum Overseas maintains strict testing for all fasteners provided as a global Hastelloy B2 / B3 Nuts Supplier and Hastelloy B2 / B3 Nuts Exporter.
- Chemical & Alloy Verification: PMI and XRF analysis to verify high molybdenum and nickel thresholds.
- Mechanical Strength Testing: Tensile, yield, proof load, and elongation tests run per ASTM E8 standards.
- Dimensional Precision: Thread fit verification per ASME B1.2, ANSI B18.2.2, and metric ISO guidelines.
- Traceable Documentation: Full EN 10204 3.1 material test certificates issued with every batch shipped.
Global Export Markets
As an international Hastelloy B2 / B3 Nuts Exporter, Aurum Overseas delivers high-nickel specialty bolting across key industrial markets globally.
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
Hastelloy B2 (UNS N10665) excels in pure non-oxidizing acid service. Hastelloy B3 (UNS N10675) features a modified chemistry that prevents intermetallic precipitation during heating, providing superior ductility and ease of fabrication.
UNS N10665 / N10675 Nuts are manufactured under ASTM B572 UNS N10665 Nuts and ASTM B572 UNS N10675 Nuts rod and bar manufacturing standards.
No, B-series alloys contain very low chromium and should not be used in oxidizing environments, such as those containing nitric acid, ferric salts, or cupric ions.
Yes, the nickel-molybdenum matrix of Hastelloy B3 offers excellent resistance to stress corrosion cracking induced by chloride-bearing reducing chemicals.
Yes, as a reliable Hastelloy B2 / B3 Nuts Exporter, Aurum Overseas supplies fully certified fasteners worldwide with international dispatch support.
We manufacture metric threads (M3 to M100) and Unified imperial series (UNC, UNF, 8UN) matching ASME, DIN, and ISO requirements.
Contact Aurum Overseas
Aurum Overseas supplies precision-engineered Hastelloy B2 / B3 Nuts designed for severe reducing environments, available with complete quality assurance and rapid dispatch.
Contact our sales engineering desk today for technical assistance and commercial price quotes.