Table of Contents
- Hastelloy B2 / B3 Round Bars Overview
- Technical Specifications
- Mechanical Properties & Chemical Composition
- Types of Hastelloy B2 / B3 Round Bars
- Key Advantages of UNS N10665 / UNS N10675 Round Bars
- Key Applications of Hastelloy B2 / B3 Round Bars
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Hastelloy B2 / B3 Round Bars Supplier & Exporter
Aurum Overseas supplies high-performance Hastelloy B2 / B3 Round Bars engineered to eliminate severe corrosion in pure reducing acid environments like hydrochloric and sulfuric acids. Alloyed with high nickel and molybdenum, our B2 and B3 bar stock delivers maximum acid protection to extend equipment service life.
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As a premier Hastelloy B2 Round Bars Supplier and Hastelloy B3 Round Bars Exporter, we stock certified ASTM B335 UNS N10665 and UNS N10675 Round Bars with EN 10204 3.1 MTCs. We offer centerless ground bright finishes, heavy forged bars, and custom cut lengths for rapid dispatch.
We export these specialized high-molybdenum nickel bars 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
| Technical Parameter | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Material Designation | Hastelloy B2 / Alloy B2 | Hastelloy B3 / Alloy B3 |
| UNS Number | UNS N10665 | UNS N10675 |
| Werkstoff Number | 2.4617 | 2.4600 |
| Manufacturing Standards | ASTM B335, ASME SB335, DIN 17752 | ASTM B335, ASME SB335, DIN 17752 |
| Diameter Capability | 3 mm to 500 mm (1/8" to 20" NB) | 3 mm to 500 mm (1/8" to 20" NB) |
| Length Specifications | 3 Meters, 6 Meters, Cut-to-Length | 3 Meters, 6 Meters, Cut-to-Length |
| Dimensional Tolerances | ISO h8, h9, h10, h11, DIN 1013 | ISO h8, h9, h10, h11, DIN 1013 |
| Delivery Conditions | Solution Annealed & Rapid Quenched | Solution Annealed & Rapid Quenched |
Mechanical Properties & Chemical Composition
Equivalent Grades of Hastelloy B2 / B3 Bars
| Grade | UNS | DIN |
|---|---|---|
| Hastelloy B2 | N10665 | 2.4617 |
| Hastelloy B3 | N10675 | 2.4600 |
Chemical Composition of Hastelloy B2 / B3 Round Bars
| Chemical Element | Hastelloy B2 Composition (%) | Hastelloy B3 Composition (%) |
|---|---|---|
| Nickel (Ni) | Balance | 65.0 min |
| Molybdenum (Mo) | 26.0 – 30.0 | 28.5 nominal |
| Iron (Fe) | 2.0 max | 1.5 nominal |
| Chromium (Cr) | 1.0 max | 1.5 nominal |
| 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 |
| Tungsten (W) | — | 3.0 max |
| Titanium (Ti) | — | 0.2 max |
| Aluminum (Al) | — | 0.50 max |
| Copper (Cu) | — | 0.20 max |
| Phosphorus (P) | 0.040 max | — |
| Sulfur (S) | 0.030 max | — |
Mechanical Properties
| Property | Hastelloy B2 (UNS N10665) | Hastelloy B3 (UNS N10675) |
|---|---|---|
| Tensile Strength | 760 MPa (110,000 psi) min | 1000 – 2000 MPa |
| Yield Strength (0.2% Offset) | 350 MPa (51,000 psi) min | — |
| Elongation (%) | 40% min | 40% min |
| Density | 9.20 g/cm³ | 9.22 g/cm³ |
| Melting Point | 1370°C (2500°F) | 1418°C |
| Modulus of Elasticity | — | 216 GPa |
Types of Hastelloy B2 / B3 Round Bars
Aurum Overseas supplies ASTM B335 Hastelloy B2 / B3 Round Bars in precision bright and heavy forged conditions for pure reducing acid service.
Hastelloy B2 / B3 Bright Bars
Hastelloy B2 / B3 Forged Bars
Key Advantages of UNS N10665 / UNS N10675 Round Bars
Extreme Acid Defense
High molybdenum content (26–30%) provides complete protection against all concentrations of pure hydrochloric acid at all temperatures, preventing catastrophic equipment failure.
Weld-Zone Reliability
Ultra-low carbon and silicon levels prevent grain-boundary carbide precipitation during welding, maintaining full corrosion protection in heat-affected zones.
Superior Thermal Stability (B3)
Alloy B3 features micro-structural chemistry improvements that prevent embrittlement during fabrication and intermediate heat exposures compared to standard B2.
Stress Cracking Defense
High nickel balance prevents chloride-induced stress corrosion cracking and hydrogen embrittlement in pure reducing process streams.
Key Applications of Hastelloy B2 / B3 Round Bars
| Industry Sector | Typical Components | Operating Conditions |
|---|---|---|
| Acetic Acid Synthesis | Catalyst injection pump shafts, reactor agitators | Hot concentrated acetic acid, carbon monoxide, and iodide catalysts |
| Hydrochloric Acid Production | Reboiler shafts, gas scrubbers, valve internals | Pure HCl acid environments across all concentrations and boiling temperatures |
| Alkylation Units | Sulfuric acid pump shafts and control valve trim | Concentrated H2SO4 process fluids and active acid recovery systems |
| Styrene Manufacturing | Distillation column tie rods, heat exchanger fittings | Organic chemical synthesis at elevated operating temperatures |
| Fine Chemical Processing | Metering pump rotors, specialized mixing shafts | Aggressive reducing reagents, anhydrous hydrogen chloride gas |
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Quality Testing & Inspection
Every batch supplied by a trusted Hastelloy B2 Round Bars Exporter and Hastelloy B3 Round Bars Exporter undergoes rigorous testing:
- Positive Material Identification (PMI): XRF analysis verifies exact concentrations of nickel, molybdenum, and iron.
- Intergranular Corrosion Resistance: ASTM G28 testing confirms complete immunity to grain boundary attack in aggressive acidic conditions.
- Ultrasonic Inspection: Volumetric NDT per ASTM A388 ensures internal structural integrity free of micro-cracks or forging bursts.
- Dimensional Inspection: Laser micrometers verify strict compliance with ISO h8 to h11 limits for rapid machining.
Global Export Markets
As an established Hastelloy B2 / B3 Round Bars Exporter, Aurum Overseas supplies fully certified UNS N10665 and UNS N10675 Round Bars to global energy and chemical engineering 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 provides identical corrosion resistance to B2 in hydrochloric acid but possesses significantly greater thermal stability and resistance to thermal embrittlement during fabrication and welding.
No. Hastelloy B2 and B3 contain minimal chromium and are specifically designed for reducing media. Oxidizing contaminants like ferric or cupric ions can cause rapid corrosion attack.
Yes. Both grades have ultra-low carbon content (0.01-0.02% max), allowing them to be welded without grain-boundary carbide precipitation in as-welded conditions.
We stock forged bar sizes from 50 mm up to 500 mm in diameter, custom cut to exact engineering lengths with full solution annealing.
All shipments include full EN 10204 3.1 Mill Test Certificates detailing heat chemistry, mechanical property testing, NDT inspection, and heat treatment records.
Contact Aurum Overseas
Aurum Overseas provides fully certified Hastelloy B2 and Hastelloy B3 Round Bars tailored to critical process specifications.
Contact our sales engineering team for stock availability, custom cut lengths, or immediate price quotes: