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Hastelloy B2/B3 Washers Suppliers & Exporters
If your hydrochloric acid units, acetic acid columns, or catalyst recovery loops require supreme resistance to pure reducing acids, you've reached the right source. As a premier Hastelloy B2 Washers Supplier and Hastelloy B3 Washers Exporter, Aurum Overseas manufactures precision Plain, Spring, Lock, Square, and Conical fasteners to ASME B18.21.1, DIN 125, and ISO 7089 standards.
Our UNS N10665 Washers and UNS N10675 Washers feature a nickel-molybdenum matrix containing 26–30% Mo engineered to resist aggressive non-oxidizing acids across all concentrations and temperatures. Supplied with full EN 10204 3.1 MTR certifications, our complete range of Hastelloy B2 and B3 fasteners is fully stocked for immediate global dispatch.
We export these washers to key global markets 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).
Technical Specifications
| Parameter | Technical Specification / Standard Range |
|---|---|
| Material Grades | Hastelloy B-2 / Hastelloy B-3 |
| Forging Designation | ASTM B574 / ASME SB574 |
| UNS Designations | UNS N10665 (B2) / UNS N10675 (B3) |
| Manufacturing Standards | ASTM B333, ASME SB333, ASTM B574, ASME SB574 |
| Dimensional Specifications | ASME B18.21.1, DIN 125 A/B, DIN 127, DIN 9021, ISO 7089, ISO 7090 |
| Washer Types | Plain Washers, Spring Washers, Lock Washers, Square Washers, Conical Washers |
| Size Capability | Imperial: #4 to 4" NB | Metric: M3 to M100 |
| Thickness Range | 0.5 mm to 12 mm |
| Hardness Limit | 100 HRB max / 240 HB max |
Technical Properties & Chemical Composition
Equivalent Grades of Hastelloy B2/B3
| STANDARD | WERKSTOFF NR. | UNS | TRADEMARK |
|---|---|---|---|
| Hastelloy B2 | 2.4617 | N10665 | Alloy B-2 |
| Hastelloy B3 | 2.4600 | N10675 | Alloy B-3 |
Chemical Composition of Hastelloy B2/B3 Washers
| Element | Hastelloy B2 (%) | Hastelloy B3 (%) |
|---|---|---|
| Nickel (Ni) | Balance | 65.0 min |
| Molybdenum (Mo) | 26.0 – 30.0 | 28.5 typ |
| Iron (Fe) | 2.0 max | 1.5 typ |
| Chromium (Cr) | 1.0 max | 1.5 typ |
| Cobalt (Co) | 1.0 max | 3.0 max |
| Manganese (Mn) | 1.0 max | 3.0 max |
| Silicon (Si) | 0.10 max | 0.10 max |
| Tungsten (W) | — | 3.0 max |
| Titanium (Ti) | — | 0.20 max |
| Aluminum (Al) | — | 0.50 max |
| Copper (Cu) | — | 0.20 max |
| Carbon (C) | 0.02 max | 0.01 max |
Mechanical Properties of Hastelloy B2/B3 Washers
| Property | Hastelloy B2 (Metric / Imperial) | Hastelloy B3 (Metric / Imperial) |
|---|---|---|
| Ultimate Tensile Strength | 760 MPa min / 110 ksi min | 785 MPa min / 114 ksi min |
| Yield Strength (0.2% Offset) | 350 MPa min / 51 ksi min | 380 MPa min / 55 ksi min |
| Elongation (%) | 40% min | 40% min |
| Hardness (Rockwell B) | 100 HRB max | 100 HRB max |
| Density | 9.20 g/cm³ / 0.332 lb/in³ | 9.22 g/cm³ / 0.333 lb/in³ |
| Melting Point | 1370°C / 2500°F | 1418°C / 2584°F |
Types of Hastelloy B2/B3 Washers
Aurum Overseas supplies a comprehensive range of Hastelloy B2/B3 washer configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
Hastelloy B2/B3 Plain Washers
Hastelloy B2/B3 Spring Washers
Hastelloy B2/B3 Lock Washers
Hastelloy B2/B3 Square Washers
Hastelloy B2/B3 Conical Washers
Key Advantages
Hydrochloric Acid Resistance
High nickel-molybdenum matrix handles pure hydrochloric acid gas and liquid streams at all concentrations and boiling temperatures.
Enhanced Thermal Stability
Alloy B-3 microstructural modifications prevent embrittling intermetallic phase precipitation during fabrication, improving ductility over B-2.
Stress Cracking Defense
Immune to chloride-induced stress corrosion cracking in pure reducing chemical media under continuous dynamic load.
Long-Term Cost Savings
Eliminates catastrophic fastener failures in aggressive acid recovery lines, minimizing unplanned maintenance downtime.
Key Applications of Hastelloy B2/B3 Washers
| Industry Sector | Application | Operating Environment |
|---|---|---|
| Hydrochloric Acid Plants | Acid reboilers, piping flanges, and pump casing bolting | Pure, hot hydrochloric acid concentrations up to boiling temperatures |
| Acetic Acid Synthesis | Catalytic reactor covers, distillation column joints, and valves | Pure reducing organic acids and high-temperature carbonylation streams |
| Petrochemical Alkylation | Catalyst regeneration loops, acid settlers, and heat exchangers | Sulfuric and hydrofluoric acid catalysts in high-yield hydrocarbon processing |
| Fine Chemical Production | Reaction vessel agitator seals, charge hole covers, and piping | Concentrated formic, phosphoric, and hydrobromic acid mixtures |
| Pharmaceutical Synthesis | High-purity acid chlorination reboilers and acid recovery lines | Highly reactive acid halide solutions free of oxidizing contaminants |
Quality Testing & Inspection
As a certified Hastelloy B2 Washers Supplier and Hastelloy B3 Washers Supplier, Aurum Overseas subjects all production batches to strict quality control:
- Positive Material Identification (PMI): Spectrometric verification confirms precise chemical composition including Ni, Mo, Fe, Cr, and W levels.
- Microstructural Stability Testing: Metallographic audits verify solution annealed condition and absence of deleterious intermetallic phase precipitation.
- Mechanical & Hardness Verification: Tensile and hardness testing guarantees compliance with 100 HRB maximum specification limits.
- Dimensional Conformance: Precision optical comparator inspections confirm exact tolerances against DIN, ISO, and ASME standards.
Global Export Markets
Aurum Overseas supplies fully certified Hastelloy B2/B3 Washers to industrial projects across:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
Hastelloy B3 provides superior thermal stability and ease of fabrication over B2, maintaining high ductility during thermal exposure while matching B2's acid resistance.
No. Alloy B-series materials are designed specifically for pure reducing media and should not be exposed to ferric ions, cupric ions, or free chlorine oxidizers.
Yes. Both alloys exhibit outstanding resistance to pure hydrochloric acid solutions across all concentration percentages up to boiling temperatures.
Hastelloy B3 fasteners retain mechanical integrity and corrosion resistance in continuous thermal operating environments up to 815°C (1500°F) in reducing atmospheres.
Every shipment includes comprehensive EN 10204 3.1 Mill Test Reports detailing heat chemistry analysis, tensile and yield strength, hardness limits, and PMI results.
Contact Aurum Overseas
Aurum Overseas provides rapid delivery of certified Hastelloy B2/B3 Washers for high-specification global infrastructure.
Contact our sales engineering team for technical assistance, material certifications, and rapid pricing.