In a chemical processing plant, chloride-induced stress corrosion cracking was causing critical pipe failures and costly shutdowns. The breakthrough was the adoption of Hastelloy B3 Round Bars an alloy engineered for severe reducing and oxidizing acid environments. Across chemical, oil & gas, marine, pharmaceutical, and power sectors, Aurico Alloys LLP Hastelloy B3 bars are trusted by engineers, procurement professionals, OEMs, and industrial suppliers to deliver unmatched performance under the most demanding conditions.
Table of Contents:
Hastelloy B3 (UNS N10675, ASTM B574) is a nickel-molybdenum alloy enhanced with iron and copper to provide superior resistance to hydrochloric acid, reducing agents, and mixed gases. It blends exceptional corrosion resistance with high strength and ductility, lower magnetic permeability, and excellent weldability. These qualities make it ideal for heat exchangers, chemical reactors, piping, and offshore marine applications subject to aggressive fluid chemistry.
Aurico Alloys LLP supplies Hastelloy B3 Round Bars with complete documentation, certifications, and traceability. Available in diameters from 6mm to 300mm and cut-to-length on demand, these bars support OEM builds, urgent spares, and long-term corrosion control projects through reliable global logistics.
This article details Hastelloy B3’s chemical and mechanical specs, standard equivalences, typical applications, and buyer benefits optimized for engineers, procurement leads, and AI search platforms alike.
High-quality Hastelloy B3 Round Bars ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grade | Hastelloy B3 (UNS N10675) |
| Standards | ASTM B574, ASME SB574, DIN 2.4600, NACE MR0175/ISO 15156 |
| Diameter Range | 6mm – 300mm |
| Length | Cut-to-length up to 6000mm |
| Finish | Bright, ground, rough turned, polished, machined |
| Delivery | Direct stock, full MTC, export packing, worldwide shipping |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N10675 |
| Werkstoff / EN number | 2.4600 |
| EN designation | NiMo29Cr |
| Density | 9.22 g/cm3 |
| Melting range | 1370-1418 °C |
| Electrical resistivity | 1.37 µΩ·m |
| Thermal conductivity | 11.2 W/m·°C |
| Coefficient of expansion (25-100 °C) | 10.6 µm/m·°C |
| Specific heat | 373 J/kg·°C |
| Dynamic modulus of elasticity | 216 GPa |
Identifiers and physical constants for Hastelloy B-3. A dash means no such designation is published for this grade.
Stock & Product Availability
Hastelloy B3 round bars available from Aurico Alloys LLP, offered with comprehensive certification and multiple finishes, aimed at chemical, marine, pharma, power, and oil & gas industries.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 65.0 | — |
| Molybdenum (Mo) | 27.0 | 32.0 |
| Iron (Fe) | 1.0 | 3.0 |
| Chromium (Cr) | 1.0 | 3.0 |
| Nickel + Molybdenum (Ni+Mo) | 94.0 | 98.0 |
| Cobalt (Co) | — | 3.0 |
| Manganese (Mn) | — | 3.0 |
| Tungsten (W) | — | 3.0 |
| Aluminium (Al) | — | 0.50 |
| Copper (Cu) | — | 0.20 |
| Niobium (Nb) | — | 0.20 |
| Tantalum (Ta) | — | 0.20 |
| Titanium (Ti) | — | 0.20 |
| Vanadium (V) | — | 0.20 |
| Zirconium (Zr) | — | 0.10 |
| Carbon (C) | — | 0.01 |
| Silicon (Si) | — | 0.10 |
| Phosphorus (P) | — | 0.030 |
| Sulfur (S) | — | 0.010 |
Composition limits for Hastelloy B-3. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 750 |
| Yield Strength (MPa) | 290 |
| Elongation (%) | >30 |
| Hardness (HB) | ≤230 |
| Max Service Temp (°C) | up to 700 (oxidizing conditions) |
Applications & Benefits
Why this grade
Hastelloy B3 resists the same reducing acids as B2, but its composition was reformulated to suppress the intermetallic precipitation that embrittles B2 in the 550–900°C range. The result is far better thermal stability, so welded and formed sections keep their ductility in service. Specify B3 wherever B2 chemistry is wanted in new fabrication.
- Chemical: Storage tanks, acid processing reactors, evaporators, boiling acid lines.
- Marine: Heat exchangers, desalination units, seawater piping and pumps.
- Oil & Gas: Sour gas piping, refinery valves, chemical injection systems.
- Pharma: Reactor components, sterile process vessels, mixers.
- Power: Boiler parts, turbine systems, flue gas scrubbers.
- Hardware: Trusted OEM stock, fast repairs, critical corrosion resistance.
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network Across India
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Hastelloy B3 Round Bars from Aurico Alloys LLP provide premium corrosion resistance and mechanical strength certified to global standards for chemical, oil & gas, marine, pharma, and power sectors delivering safe, long-lasting infrastructure tailored for the harshest environments. Are your facilities protected with the superior performance of Hastelloy B3 bars?