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Product Overview
Introduction To Hastelloy B-3 / Alloy B-3 / UNS N10675
MOKSH TUBES & FITTINGS LLP LLP is a reputed manufacturer, exporter, importer, and stockist of high-quality HASTELLOY B-3 (UNS N10675) products. We supply an extensive range of B-3 alloy materials such as Pipes & Tubes, Pipe Fittings, Flanges, Fasteners, Sheets, Plates, Coils, Bars, Welding Rods, Wire Mesh, and precision-engineered custom components. Built to withstand extreme corrosion, HASTELLOY B3 is the enhanced version of Hastelloy B-2, offering improved thermal stability and fabrication properties.
HASTELLOY B3 is a nickel-molybdenum alloy designed to handle strong reducing agents, including hydrochloric, hydrobromic, sulfuric, and phosphoric acids. Compared to B-2, it provides better resistance to pitting, stress corrosion cracking, and knife-line/heat-affected zone (HAZ) attack after welding. Its superior formability and weldability make it ideal for modern chemical processing and pickling systems.
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Hastelloy B-3 – Specifications (UNS N10675)
| Category | Details |
|---|---|
| Grade | Hastelloy B-3 / Alloy B-3 / UNS N10675 |
| Material Type | Nickel–Molybdenum Alloy |
| Key Features | Exceptional resistance to reducing acids (HCl, HBr), improved weldability, high thermal stability |
| Chemical Summary | Ni ~65%, Mo 27–32%, Fe 1–3%, Cr ~1.5% |
| Available Conditions | Annealed, Solution Annealed, Hot Rolled, Cold Worked |
| Heat Treatment | Solution Anneal at 1065–1120°C with rapid cooling |
| Weldability | Excellent — no knife-line attack, low HAZ sensitivity |
| Testing Offered | PMI, Chemical Test, Tensile, Hardness, UT, NDT |
| Certification | EN 10204 3.1 / 3.2 |
| Standards | ASTM B333, B622, B619, B626 |
| Industries Served | Chemical, Metal Pickling, Pharmaceuticals, Electronics, Fertilizers |
Chemical Composition of Hastelloy B-3
| Element | Composition (% by Weight) |
|---|---|
| Nickel (Ni) | Balance (~65%) |
| Molybdenum (Mo) | 27.0 – 32.0 |
| Iron (Fe) | 1.0 – 3.0 |
| Chromium (Cr) | 1.5 |
| Cobalt (Co) | 3.0 |
| Manganese (Mn) | 1.5 |
| Silicon (Si) | 0.10 |
| Carbon (C) | 0.01 |
| Phosphorus (P) | 0.02 |
| Sulfur (S) | 0.01 |
Hastelloy B-3 offers improved microstructural stability and corrosion resistance compared to B-2.
Technical Composition Properties of Hastelloy B-3
Physical Properties of Hastelloy B-3
| Property | Value |
|---|---|
| Density | 9.22 g/cm³ |
| Melting Point | 1370 °C (2500 °F) |
| Tensile Strength | 760 MPa / 110,000 psi |
| Yield Strength (0.2%) | 355 MPa / 52,000 psi |
| Elongation | 40% |
Heat Treatment of Hastelloy B-3
| Process | Temperature Range | Cooling Method |
|---|---|---|
| Solution Annealing | 1065 – 1120 °C | Rapid water or air quench |
| Stress Relieving | 870 – 900 °C | Air cool after 1–2 hours |
| Hot Working | 900 – 1200 °C | Finish above 950 °C, quench immediately |
| Cold Working | — | Annealing recommended after heavy deformation |
| Post-Weld Heat Treatment | Optional | Restores corrosion resistance |
⚠ Rapid cooling is critical to prevent grain growth and maintain corrosion resistance.
Mechanical Properties of Hastelloy B-3
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 760 MPa | 110,000 psi |
| Yield Strength (0.2%) | 355 MPa | 52,000 psi |
| Elastic Modulus (RT) | 210 GPa | 30,000 ksi |
| Elongation (50.8 mm) | 40% | 40% |
| Hardness (Rockwell B) | 88 | 88 |
Hastelloy B-3 eliminates knife-line attack, a major improvement over Hastelloy B-2.
International Standards & Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | N10675 |
| W.Nr | 2.4600 |
| ASTM | B333, B622, B619, B626 |
| ASME | SB333, SB622, SB619, SB626 |
Products in Hastelloy B3
MOKSH TUBES & FITTINGS LLP, we offer Hastelloy B-3 in a full range of product forms:
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Seamless Pipes
✔
Welded Pipes (ERW & EFW)
✔
Tubes (Capillary, U-Bend)
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Sheets & Plates
✔
Coils & Strips
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Round Bars, Flat Bars, Hex Bars, Square Bars
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Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
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Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
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Fasteners (Bolts, Nuts, Screws, Washers, Studs)
✔
Custom Fabricated Components
We offer Hastelloy B3 in a wide range of product forms, including:
Uses and Advantages
Outstanding resistance to hydrochloric acid and other reducing media
Superior performance after welding – no knife-line attack or HAZ corrosion
Excellent mechanical strength in high-temperature, high-acidity environments
Improved formability, weldability, and fabrication compared to B-2
Long service life in aggressive chemical settings
Applications of Hastelloy B3
HASTELLOY B-3 is a nickel-molybdenum alloy designed for exceptional resistance to hydrochloric acid and other strongly reducing chemicals. Known for its improved thermal stability and resistance to stress corrosion cracking over earlier B-series alloys, B-3 is ideal for highly corrosive environments where reliability is critical.
Chemical Processing Industry
Extensively used in reactors, heat exchangers, evaporators, and storage tanks handling hydrochloric acid, hydrobromic acid, sulfuric acid (under reducing conditions), and other aggressive chemical mixtures.
Pharmaceutical and Fine Chemical Manufacturing
Preferred for process vessels and piping where ultra-pure environments and resistance to reducing agents (including cleaning chemicals) are necessary.
Metal Pickling and Acid Regeneration Systems
Ideal for components exposed to highly concentrated hydrochloric acid during metal pickling or acid recovery processes
Electronics and Semiconductor Industry
Used in equipment exposed to highly corrosive chemical baths and etchants that require material purity and resistance to acid attack.
Agrochemical and Fertilizer Production
Deployed in reaction vessels and acid transfer lines where strong reducing media are present in the production of specialty chemicals and fertilizers.
Pulp and Paper Industry
Utilized in specific stages of chemical pulping and bleaching where resistance to reducing agents is required.
HASTELLOY B-3's with its outstanding corrosion resistance, particularly to hydrochloric acid, and improved fabricability, HASTELLOY B-3 is a reliable choice for mission-critical equipment exposed to some of the harshest reducing environments.
WHY CHOOSE US?
Hastelloy B-3 Price in India
Typical Range: ₹2,900 – ₹5,800 per kg
(Price varies by OD, wall thickness, form, and finish)
Contact us for exact quotation based on size and quantity.
FAQ's
What is Hastelloy B-3 used for?
Hastelloy B-3 is ideal for chemical processing, pharmaceutical, metal pickling, and semiconductor industries where strong reducing acids like hydrochloric acid are used.
How is Hastelloy B-3 different from Hastelloy B-2?
B-3 has better resistance to stress corrosion cracking, pitting, and knife-line attacks after welding, along with superior thermal stability and formability.
Which products are available in Hastelloy B-3?
We offer pipes, tubes, sheets, plates, bars, flanges, fittings, fasteners, wire mesh, welding rods, and custom components.
What are the benefits of using Hastelloy B-3?
Hastelloy B-3 provides outstanding acid resistance, excellent weldability, high mechanical strength, and long lasting performance in harsh chemical environments.
Why choose MOKSH TUBES & FITTINGS LLP for Hastelloy B-3 products?
We provide decades of alloy expertise, certified quality, custom fabrication, traceable documentation, and fast international delivery for critical industrial applications.
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