Hastelloy B-2 (UNS N10665) – Supplier of Round Bars, Seamless Tubes & Plates | Shanghai Hangbo Alloy Group
Date: 2026年7月13日 Categories: News Views: 286
By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 Certified | Est. 2012 | Shanghai, China
Quick Answer: What Is Hastelloy B-2?
Hastelloy B-2 (UNS N10665 / W.Nr. 2.4617) is a wrought nickel-molybdenum superalloy specifically engineered for its unparalleled resistance to reducing environments, most notably hydrochloric acid across all concentrations and temperatures. Characterized by its high molybdenum content (26-30%) and ultra-low carbon and silicon, it provides significant resistance to stress-corrosion cracking and pitting. Shanghai Hangbo Alloy Group supplies premium Hastelloy B-2 as round bars, seamless tubes, and plates, with full EN 10204 3.1 certification for the world's most demanding chemical processing reactors.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N10665 |
| W.Nr. | 2.4617 |
| Density | 9.22 g/cm³ (0.333 lb/in³) |
| Melting Range | 1330 – 1380 °C (2425 – 2515 °F) |
| Max Service Temp. | 425 °C (800 °F) for structural strength |
| Tensile Strength (RT) | ≥ 760 MPa (110 ksi) |
| Yield Strength (RT) | ≥ 310 MPa (45 ksi) |
| Elongation (RT) | ≥ 40% |
| Thermal Conductivity | 11.1 W/m·K (at 20°C) |
| Key Standards | ASTM B335, ASTM B333, ASTM B622 |
Product Overview
Hastelloy B-2 (UNS N10665), also known as Alloy B2, is a solid-solution strengthened nickel-molybdenum alloy. Its primary differentiator is its extreme resistance to hydrogen chloride gas, and sulfuric, acetic, and phosphoric acids. Because it contains virtually no chromium, it should not be used in oxidizing environments or in the presence of oxidizing salts (such as ferric or cupric chlorides). However, in purely reducing media, it offers a level of stability and performance that few other alloys can match. Its ultra-low carbon (≤0.01%) and silicon (≤0.08%) content ensure high resistance to intergranular corrosion in the heat-affected zone after welding.
Top three properties:
- Unmatched Hydrochloric Acid Resistance: The industry standard for handling HCl at all temperatures.
- Superior Stress-Corrosion Cracking Resistance: High nickel content provides immunity to chloride-induced SCC.
- Excellent Weldability: Low-carbon chemistry allows for use in the as-welded condition.
Shanghai Hangbo Alloy Group Co., Ltd. (est. 2012) is a leading manufacturer and global supplier of Hastelloy B-2. Based in Shanghai, China, we operate an ISO 9001:2015 certified supply chain serving the global chemical processing and pharmaceutical sectors in over 32 countries. We supply Hastelloy B-2 in all primary forms, ensuring zero-defect quality for critical pressure vessels and distillation columns.
Related grades: Hastelloy B-3 · Hastelloy C-276 · Inconel 600 · Monel 400
Executive Standards
| Product Form | ASTM | ASME | EN / W.Nr. | DIN |
|---|---|---|---|---|
| Round Bar / Forging | ASTM B335 / B564 | ASME SB-335 | 2.4617 | DIN 17752 |
| Seamless Tube / Pipe | ASTM B622 | ASME SB-622 | 2.4617 | DIN 17751 |
| Welded Pipe / Tube | ASTM B619 / B626 | ASME SB-619 | 2.4617 | — |
| Sheet / Plate / Strip | ASTM B333 | ASME SB-333 | 2.4617 | DIN 17750 |
Chemical Composition (wt.% per ASTM B335)
100% OES verified on every heat at Shanghai Hangbo Alloy Group.
| Element | Ni | Mo | Fe | Cr | Co | Mn | Si | C | P | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Min | Bal. | 26.0 | — | — | — | — | — | — | — | — |
| Max | — | 30.0 | 2.0 | 1.0 | 1.0 | 1.0 | 0.08 | 0.01 | 0.04 | 0.03 |
Mechanical & Physical Properties
Room-Temperature Properties (Annealed)
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥ 760 MPa (110 ksi) | ASTM B335 |
| Yield Strength (0.2%) | ≥ 310 MPa (45 ksi) | ASTM B335 |
| Elongation | ≥ 40% | ASTM B335 |
| Hardness | ≤ 100 HRB | — |
| Density | 9.22 g/cm³ | — |
| Melting Range | 1330–1380 °C | — |
| Thermal Conductivity | 11.1 W/m·K at 20°C | — |
| Specific Heat | 373 J/kg·K | — |
High-Temperature Strength Retention
| Temp (°C) | Tensile Str. (MPa) | Yield Str. (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 780 | 360 | 50 |
| 100 | 750 | 330 | 52 |
| 200 | 700 | 290 | 55 |
| 400 | 650 | 240 | 60 |
Heat Treatment
Hastelloy B-2 is strictly used in the solution-annealed condition to achieve its maximum metallurgical stability and corrosion performance.
- Solution Annealing Temperature: 1060°C – 1080°C (1940°F – 1975°F).
- Soaking Time: 1 to 2 hours depending on section size.
- Cooling Method: Rapid air cool or water quench. Mandatory: Rapid cooling is essential to prevent the formation of Ni4Mo and Ni3Mo precipitates, which can cause severe embrittlement and reduce corrosion resistance.
- Grain Size Control: Shanghai Hangbo maintains strict thermal cycles to achieve an ASTM grain size of No. 4–6, ensuring optimal mechanical toughness and uniform corrosion response.
- Aging: This alloy is not age-hardenable. It must never be exposed to the 550°C to 850°C range for prolonged periods, as this will lead to a loss of ductility and corrosion resistance.
How Shanghai Hangbo Produces Hastelloy B-2
1. Round Bars & Forgings
- Clean Melting: Vacuum Induction Melting (VIM) followed by Electroslag Remelting (ESR) for ultra-low carbon (≤0.01%) and precise Nickel-Molybdenum control.
- Forging: Precision hot forging in the 1000–1200°C window to refine the dendritic structure.
- Annealing: High-temperature solution anneal at 1070°C followed by immediate high-pressure water quenching.
- Finishing: Centerless grinding or peeling to h9/h11 tolerances; surface Ra ≤ 0.8 µm surface finish.
2. Seamless Tubes & Pipes
- Billet Extrusion: High-purity ESR billets extruded at 1100°C to form mother tubes.
- Cold Processing: Precision multi-pass cold drawing or pilgering to reach final dimensions (OD 6mm–219mm).
- Hydrogen Annealing: Solution annealing in a protective hydrogen atmosphere for a bright, passive surface.
- NDT Verification: 100% Eddy Current and Hydrostatic testing to ensure integrity in high-pressure reactor lines.
3. Plates, Sheets & Strips
- Rolling: Hot rolling of slabs followed by precision cold rolling for smooth finish and tight gauge control.
- Pickling: Solution annealing followed by chemical pickling (White surface) to ensure a clean, oxide-free surface.
- Flatness Control: Levelling to ≤ 3 mm/m flatness per ASTM standards.
- Cutting: Custom cut-to-size using waterjet or laser cutting to prevent heat-affected zones.
Industry Applications
| Industry | Typical Component | Why Hastelloy B-2? |
|---|---|---|
| Chemical Processing | Distillation columns, reactor vessels | Best resistance to hydrochloric acid at all temps. |
| Pharmaceutical | Agitators, centrifuges, high-purity reactors | Excellent resistance to mixed reducing acids. |
| Oil & Gas | Wellhead components for sour service | Immune to sulfide stress-corrosion cracking. |
| Pesticide Production | Heat exchangers, valves, piping | Handles aggressive chlorides and hydrogen chloride. |
| Fertilizer Production | Sulfuric and phosphoric acid equipment | Resists corrosion in pure reducing environments. |
| Aromatics | Alkylation units, piping | High stability in hydrocarbon processing. |
Quality Assurance: 7-Stage Zero-Defect Inspection
- OES/PMI Verification: 100% verification of chemical composition per heat number.
- Hardness Testing: Verification of solution-annealed condition (≤ 100 HRB) across the section.
- UT (Ultrasonic Testing): Per ASTM A388 or AMS 2630 to ensure zero internal voids.
- Macro-Etch Inspection: To verify uniform grain structure and absence of Ni4Mo precipitates.
- Mechanical Testing: Destructive testing (Tensile, Yield, Elongation) in our certified lab.
- Grain Size Inspection: Per ASTM E112 to ensure No. 4–6 range.
- Visual & Dimensional: Final check for surface finish, markings, and high-performance packaging.
Deliverables: ISO 9001:2015 certificate, EN 10204 3.1 MTC, and SGS/BV/TÜV reports on request.
Frequently Asked Questions
Q1: What is Hastelloy B-2 used for?
Hastelloy B-2 (Alloy B2) is primarily used for components that handle aggressive reducing acids, especially hydrochloric acid in all concentrations and temperatures, as well as sulfuric, acetic, and phosphoric acids.
Q2: What is the density of Hastelloy B-2?
The density of Hastelloy B-2 is 9.22 g/cm³ (0.333 lb/in³).
Q3: What is the maximum service temperature of Hastelloy B-2?
For structural strength and pressure vessel applications, it is typically used up to 425°C (800°F). Above this range, the material is prone to phase-related embrittlement.
Q4: What is the melting point of Hastelloy B-2?
Hastelloy B-2 has a melting range of 1330°C to 1380°C (2425°F to 2515°F).
Q5: What is the tensile strength of Hastelloy B-2?
In the solution-annealed condition, Hastelloy B-2 provides a minimum room-temperature tensile strength of ≥ 760 MPa (110 ksi).
Q6: What is the yield strength of Hastelloy B-2?
The yield strength (0.2% offset) of annealed Hastelloy B-2 is typically ≥ 310 MPa (45 ksi) at room temperature.
Q7: What is the elongation of Hastelloy B-2?
Hastelloy B-2 offers excellent ductility, with a typical elongation of ≥ 40% in the annealed condition.
Q8: What are the full mechanical properties of Hastelloy B-2?
Hastelloy B-2 is characterized by high tensile strength (760 MPa), moderate yield strength (310 MPa), and high elongation (40%), combined with exceptional resistance to stress-corrosion cracking in reducing environments.
Q9: What heat treatment does Hastelloy B-2 require?
It requires solution annealing at 1060°C – 1080°C followed by a mandatory rapid water quench to prevent embrittling phase precipitation.
Q10: What is the solution annealing temperature for Hastelloy B-2?
The standard solution annealing temperature is between 1060°C and 1080°C.
Q11: How does Hastelloy B-2 compare to Hastelloy B-3?
Hastelloy B-3 is an improved version of B-2 with better thermal stability. B-3 is more resistant to embrittlement during fabrication (welding/forming) and can be used in larger section sizes more safely than B-2.
Q12: What is the price of Hastelloy B-2 per kg?
Pricing is influenced by the current nickel and molybdenum (28%) market prices. Please contact Shanghai Hangbo Alloy Group at specialalloy001@gmail.com or hangbo@nickel-alloy.com for a real-time competitive quote.
Q13: Is Hastelloy B-2 weldable?
Yes, Hastelloy B-2 has excellent weldability. Its low carbon content prevents sensitization during welding. Matching filler wire (Alloy B2) is recommended.
Q14: What product forms does Shanghai Hangbo supply?
We supply Hastelloy B-2 in round bars (6mm–400mm), seamless tubes, plates, sheets, and wire.
Q15: Does Shanghai Hangbo ship internationally?
Yes. We export to over 32 countries with full customs support and door-to-door delivery options (DDP/DAP).
Q16: Can Hastelloy B-2 be used in nitric acid?
No. Hastelloy B-2 contains no chromium and will corrode rapidly in oxidizing environments like nitric acid or in the presence of ferric/cupric chlorides.
Q17: Is Hastelloy B-2 magnetic?
No, Hastelloy B-2 is a non-magnetic superalloy.
Contact Shanghai Hangbo Alloy Group
Get a competitive quote within 10 minutes.
| Channel | Details |
|---|---|
| Website | www.nickel-alloy.com |
| specialalloy001@gmail.com | |
| Email 2 | hangbo@nickel-alloy.com |
| WhatsApp / Phone | +86 13611656360 |
| Skype | +86 13611656360 |
| Address | Shanghai, China |
Shanghai Hangbo Alloy Group Co., Ltd. — Your Specialist Partner for Reducing Acid Corrosion Resistance.
