Table of Contents
- Hastelloy B2 / B3 Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- Types of UNS N10665 / UNS N10675 Square Bars
- Hastelloy B2 vs. Hastelloy B3 Comparison
- Key Advantages of Hastelloy B2 / B3 Square Bar
- Key Applications of Hastelloy B2 / B3 Square Bar
- Quality Assurance & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Hastelloy B2 / B3 Overview
Aurum Overseas is a leading Hastelloy B2 Square Bars Supplier and Hastelloy B3 Square Bars Supplier providing premium nickel-molybdenum alloy bars for extreme acid environments. Our UNS N10665 Square Bars and UNS N10675 Square Bars resist pure hydrochloric acid across all concentrations and boiling temperatures.
As a trusted Hastelloy B2 and Hastelloy B3 Square Bars Exporter, we supply precision UNS N10665 / UNS N10675 Bright Square Bars for machining and heavy UNS N10665 / UNS N10675 Forged Square Bars for structural support. All orders include EN 10204 3.1 mill test certificates, heat traceability, and custom cut-to-length sizing.
We supply certified nickel-molybdenum square bar stock to acetic acid plants, alkylation units, herbicide processing facilities, and chemical synthesis plants across the USA, Germany, UK, UAE, Saudi Arabia, and international markets.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM B335, ASME SB335, DIN 17752, ISO 9723 |
| UNS Designation | UNS N10665 (B2) / UNS N10675 (B3) |
| Size Range (Square) | 6.0 mm x 6.0 mm to 200 mm x 200 mm (1/4" to 8" square) |
| Length Options | 1,000 mm to 6,000 mm, Custom Precision Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Bright Annealed, Hot Forged, Rough Turned |
| Condition | Solution Annealed (1065 °C to 1120 °C followed by rapid quench) |
| Dimensional Tolerances | ASTM B335 h9, h10, h11 square profile tolerances |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | Standard | Werkstoff Nr. | UNS Designation |
|---|---|---|---|
| Hastelloy B2 | ASTM B335 / ASME SB335 | 2.4617 | N10665 |
| Hastelloy B3 | ASTM B335 / ASME SB335 | 2.4600 | N10675 |
Chemical Composition (%)
| Element | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Nickel (Ni) | Balance (Bal) | 65.0 min |
| Molybdenum (Mo) | 26.0 – 30.0 | 28.5 |
| Chromium (Cr) | 1.0 max | 1.5 |
| Iron (Fe) | - | 1.5 |
| Tungsten (W) | - | 3.0 max |
| Manganese (Mn) | 0.1 max | 3.0 max |
| Carbon (C) | 0.02 max | 0.01 max |
| Silicon (Si) | 0.1 max | 0.10 max |
| Aluminum (Al) | - | 0.50 max |
| Titanium (Ti) | - | 0.2 max |
| Phosphorus (P) | 0.04 max | - |
| Sulfur (S) | 0.03 max | - |
Mechanical & Physical Properties
| Property Parameter | Hastelloy B2 Metric (Imperial) | Hastelloy B3 Metric (Imperial) |
|---|---|---|
| Density | 9.2 g/cm³ (0.332 lb/in³) | 9.2 g/cm³ (0.332 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 UNS N10665 / UNS N10675 Square Bars
Aurum Overseas supplies Hastelloy B2 and B3 square bars in precision bright and heavy forged conditions for pure reducing acid applications.
Hastelloy B2 / B3 Bright Square Bars
Hastelloy B2 / B3 Forged Square Bars
Hastelloy B2 vs. Hastelloy B3 Comparison
| Comparison Parameter | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Thermal Stability | Susceptible to microstructural embrittlement between 600°C–850°C | Enhanced (Resists intermetallic phase precipitation during heat exposure) |
| Fabrication & Formability | Requires strict heat management during hot forming to avoid cracking | Superior (Greater ductility during thermal cycles and forming) |
| Oxidizing Media Sensitivity | Unsuitable for ferric or cupric salts | Unsuitable for oxidizing contaminants |
| Selection Preference | Legacy engineering specifications | Modern standard for complex fabricated vessels and structural bars |
Key Advantages of Hastelloy B2 / B3 Square Bar
Unmatched Hydrochloric Acid Immunity
Resists pure hydrochloric acid across all concentrations and operational temperatures up to boiling point.
Resists Sulfuric & Phosphoric Acids
Performs exceptionally well in pure reducing acids and dry hydrogen chloride gas streams.
Low Carbon & Silicon Levels
Minimizes intergranular precipitation in heat-affected zones during welding operations.
High Stress Corrosion Resistance
Protects components against chloride-induced stress corrosion cracking in severe reducing media.
Key Applications of Hastelloy B2 / B3 Square Bar
| Industry | Applications | Key Benefit |
|---|---|---|
| Acetic Acid Production | Catalyst support bars, reactor agitator shafts | Prevents rapid metal consumption in hot, pure acetic acid processes. |
| Hydrochloric Acid Processing | Acid reboiler supports, pump shafts, valving | Maintains dimensional stability and structural mass in aggressive HCl. |
| Alkylation Units | Catalyst recovery shafting, mixing blades | Withstands concentrated sulfuric and hydrofluoric acid catalysis. |
| Pharmaceutical Synthesis | Batch reaction vessel structural supports | Ensures zero product contamination from metallic degradation. |
Quality Assurance & Inspection
Every shipment managed by an established Hastelloy B2 Square Bars Exporter and Hastelloy B3 Square Bars Exporter undergoes rigorous testing protocols:
- Chemical Verification: Optical emission spectroscopy and PMI testing to verify strict chemistry limits.
- Mechanical Testing: Tensile, yield, and elongation testing to verify compliance with ASTM B335 standards.
- Microstructural Evaluation: Grain size and intermetallic phase checking to verify thermal stability.
Global Export Markets
As an established Hastelloy B2 / B3 Square Bars Exporter, Aurum Overseas supplies fully certified UNS N10665 and UNS N10675 Square Bars to global chemical processing centers:
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
Hastelloy B3 offers enhanced thermal stability and ductility, resisting intermetallic phase cracking during thermal processing while matching B2's acid resistance.
Bright bars deliver tight tolerances for automatic lathe machining, whereas forged bars provide dense grain structures suited for load-bearing structures.
No, both grades are strictly formulated for pure reducing media and suffer rapid corrosion if ferric or cupric oxidizing salts are present.
No, UNS N10675 resists intergranular precipitation during welding, allowing components to enter service in as-welded condition.
All orders dispatched by Aurum Overseas include full EN 10204 3.1 Mill Test Certificates covering chemical breakdown, heat numbers, and mechanical properties.
Contact Aurum Overseas
Partner with a trusted Hastelloy B2 and B3 Square Bars Supplier for certified stock, custom sawing, and fast international dispatch.