Table of Contents
- Hastelloy B2 / B3 Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- Types of Hastelloy B2 / B3 Hex Bars
- Key Advantages of Hastelloy B2 / B3 Hex Bars
- Key Applications of Hastelloy B2 / B3 Hex Bars
- Quality Assurance & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Hastelloy B2 / B3 Overview
Featuring a high 28.5% molybdenum nickel matrix, Hastelloy B2 / B3 Hex Bars provide unmatched structural performance in pure reducing environments like boiling hydrochloric acid. Aurum Overseas is a premier Hastelloy B2 Hex Bars Supplier and Hastelloy B3 Hex Bars Supplier, stocking solution-annealed solid hexagon stock engineered for severe chemical synthesis equipment.
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As an established Hastelloy B2 and B3 Hex Bars Exporter, we supply cold-drawn Hastelloy B2 / B3 Bright Hex Bars for CNC fittings alongside heavy Hastelloy B2 / B3 Forged Hex Bars for pressure valves. While B2 excels in pure acid lines, B3 offers enhanced thermal stability to prevent embrittlement during fabrication.
We export certified nickel-molybdenum hex stock compliant with ASTM B335 and ASME SB335 standards directly to acetic acid synthesis units, alkylation systems, and chemical processing facilities across the USA, UK, Germany, UAE, Saudi Arabia, and global markets.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B335, ASME SB335, DIN 17752, EN 10088-3 |
| UNS Designation | UNS N10665 (Alloy B2) / UNS N10675 (Alloy B3) |
| Across-Flats (AF) Size Range | 6.0 mm to 100.0 mm (1/4" to 4" Hexagon) |
| Length Options | 1,000 mm to 6,000 mm, Precision Sawing Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Bright Annealed, Hot Forged, Rough Machined |
| Heat Treatment Condition | Solution Annealed (1060 °C to 1150 °C, Water Quenched) |
| Dimensional Tolerances | ASTM B335 / ISO 286-2 (h9, h10, h11 hex profile tolerances) |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Standard / Grade | Werkstoff Nr. | UNS Designation | Common Name |
|---|---|---|---|
| Hastelloy B2 | 2.4617 | N10665 | Alloy B-2 |
| Hastelloy B3 | 2.4600 | N10675 | Alloy B-3 |
Chemical Composition (%)
| Element | Specification Range (UNS N10665 - B2) | Specification Range (UNS N10675 - B3) |
|---|---|---|
| Molybdenum (Mo) | 26.0 – 30.0 | 28.5 (27.0 – 32.0) |
| Chromium (Cr) | 1.0 max | 1.5 max |
| Iron (Fe) | 2.0 max | 1.5 max |
| Carbon (C) | 0.02 max | 0.01 max |
| Silicon (Si) | 0.10 max | 0.10 max |
| Manganese (Mn) | 1.0 max | 3.0 max |
| Tungsten (W) | — | 3.0 max |
| Aluminum (Al) | — | 0.50 max |
| Titanium (Ti) | — | 0.20 max |
| Nickel (Ni) | Balance | Balance (65.0 min) |
Mechanical & Physical Properties
| Property Parameter | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Density | 9.22 g/cm³ (0.333 lb/in³) | 9.22 g/cm³ (0.333 lb/in³) |
| Melting Point | 1370 °C (2550 °F) | 1370 °C (2550 °F) |
| Tensile Strength (Min) | 760 MPa (115,000 Psi) | 760 MPa (115,000 Psi) |
| Yield Strength (0.2% Offset, Min) | 350 MPa (52,000 Psi) | 350 MPa (52,000 Psi) |
| Elongation (Min) | 40 % | 40 % |
Types of Hastelloy B2 / B3 Hex Bars
Aurum Overseas supplies Hastelloy B2 and B3 hex bars in precision bright and heavy forged conditions for pure reducing acid service.
Hastelloy B2 / B3 Bright Hex Bars
Hastelloy B2 / B3 Forged Hex Bars
Key Advantages of Hastelloy B2 / B3 Hex Bars
Unmatched Hydrochloric Acid Resistance
High nickel-molybdenum matrix provides complete resistance to pure hydrochloric acid at all concentrations and boiling temperatures.
Enhanced Thermal Stability (B3 Grade)
Alloy B3 chemistry resists the formation of embrittling intermetallic phases during thermal exposure and welding operations.
Resists Stress Corrosion Cracking
Nickel base prevents chloride-induced stress corrosion cracking in aggressive reducing chemical lines.
Pitting Protection in Pure Acids
Low carbon content minimizes carbide precipitation in welded heat-affected zones, preserving full corrosion resistance.
Key Applications of Hastelloy B2 / B3 Hex Bars
| Industry | Applications | Operational Benefit |
|---|---|---|
| Acetic Acid Processing | Reactor tie rods, pump shafts, agitator bolts | Exceptional structural stability and long-term service life in aggressive organic acid media. |
| Chemical Synthesis | Hydrochloric acid valves, reboiler hex plugs, mixer shafts | Complete resistance to boiling acid streams under severe process conditions. |
| Petrochemical Alkylation | Catalyst recovery valve stems, acid line fittings | High mechanical strength and zero degradation in strong reducing catalysts. |
| Pharmaceutical Equipment | Reaction vessel fasteners, sanitization valve seats, hex caps | Prevents batch contamination during aggressive acid cleaning and sterilization cycles. |
Quality Assurance & Inspection
As a trusted Hastelloy B2 Hex Bars Exporter and Hastelloy B3 Hex Bars Exporter, Aurum Overseas conducts rigorous testing on every shipment:
- Spectro Chemical PMI: 100% XRF chemical testing to verify precise molybdenum, nickel, and ultra-low carbon limits.
- Microstructure & Grain Size Inspection: Evaluated to ensure complete absence of intermetallic phase precipitation.
- Mechanical Testing: Full tensile, yield, elongation, and hardness testing per ASTM B335 standards.
- Ultrasonic Inspection (NDT): Volumetric testing per ASTM E213 to ensure total internal structural soundness.
Global Export Markets
As an established Hastelloy B2 / B3 Hex Bars Exporter, Aurum Overseas supplies fully certified UNS N10665 and UNS N10675 Hex Bars to global acetic acid, chemical synthesis, and pharmaceutical 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 features enhanced thermal stability over B2, preventing the formation of embrittling microstructural phases during fabrication, heating, and welding.
Hastelloy B2 (UNS N10665) and B3 (UNS N10675) hex bars are produced in full compliance with ASTM B335 and ASME SB335 standards.
No, B-series alloys are specifically designed for reducing environments and should not be used in the presence of ferric or cupric salts, which cause rapid corrosion.
Hexagonal profiles provide pre-formed parallel flat faces, eliminating extra milling steps when machining high-torque bolts, valve stems, and plugs.
All orders from Aurum Overseas include certified EN 10204 3.1 Mill Test Certificates detailing heat chemistry, mechanical values, and compliance reports.
Contact Aurum Overseas
Partner with a trusted Hastelloy B2 Hex Bars Supplier and global Hastelloy B3 Hex Bars Exporter for certified alloy stock, custom cut-to-length sawing, and rapid international delivery.