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Model No: Hastelloy B-2
Din 2.4617-UNS N10665-ASTM B333-Hastelloy B-2 Alloy Plate
The prerequisite for using Hastelloy B-2 is that you must have complete confidence in your medium. As long as the medium is pure and free of oxidizing impurities, and you keep a close eye on the molybdenum content (≥26%), control the iron content (≤2%), and manage the interlayer temperature well during processing, the advantage of alloy B-2 is that it can resist reducing acids for 20 years without any problems.
Quantity :
US $35.00 - US $55.00
Product Introduction
Based on past procurement experience and customer feedback, users who purchase Hastelloy B-2 Alloy Plates almost invariably encounter one scenario—they deal with strong reducing acids such as hydrochloric acid and dilute sulfuric acid, and the medium cannot contain oxidants. Common applications include chemical or experimental research reactors, towers, and heat exchangers.
The design logic is very pure: push nickel （nickel (Ni) content as high as 65-70%）and molybdenum (molybdenum (Mo) content as high as 26-30%) to the extreme, while minimizing other elements (chromium (Cr) is deliberately reduced to below 1%).
However, it has a fatal flaw that must be clearly stated: B-2 absolutely cannot come into contact with oxidizing media, such as oxygen-containing hydrochloric acid, solutions contaminated with iron or copper ions, concentrated sulfuric acid, or nitric acid. Once exposed, the corrosion rate will be alarmingly fast, and the equipment may become unusable within months. Those who purchase B-2 must be fully aware of the redox potential of their chosen media.
Chemical Composition
| Material Type | C | Si | Ni | Cr | Mo | Fe |
|---|---|---|---|---|---|---|
| permalloy 80 strip | ≤0.02% | ≤0.1% | 65-70% | ≤1.0% | 26.0-30.0% | ≤2.0% |
Mechanical Properties
(Solution annealed state, typical values for sheet metal)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 745 MPa （107 ksi） | ≥ 325 MPa (approx. 51 ksi) | ≥ 40% | ≤ HRB 100 (annealed) |
Special reminder: The Hastelloy B-2 sheets we provide are typically delivered in a solution-annealed state, where the material is soft and easy to process and shape. Unlike Inconel 718, it cannot be strengthened through heat treatment—B-2 cannot have its hardness increased through heat treatment.
Supply Specifications and Standards:
Lork Steel supplies Hastelloy B-2 alloy plates conforming to ASTM B333 (the core standard for nickel-molybdenum alloy plates), ASME SB-333 (for pressure vessels), or DIN 2.4617 (German standard) and UNS N10665 (American Standard No.). Tolerances are as specified in the applicable standards.
Thickness Specifications: B-2 alloy plates are generally available from 1mm to 100mm, with 6mm/8mm plates commonly in stock. For thinner plates (≤4.75mm) and medium-thick plates, the sourcing channels may differ, and we need to confirm the specifications with you in advance. Common widths are 500/800/1000/1219mm, and lengths are 600/800/1000/2000mm or fixed lengths.
Processing difficulty and key points
Hastelloy B-2 is difficult to process, and the sheet metal is also difficult to form. These processing points should be noted for producing qualified products:
1. Hot Working (Forging, Hot Forming):
The hot working temperature for Hastelloy B-2 needs to be controlled within the range of 1160℃～900℃. Rapid heating to the required temperature is crucial to prevent the precipitation of the Ni4Mo phase (β phase), which would make the material brittle. The final forging temperature needs to be controlled above 900℃; this experience comes from our processing plant's test data.
The hot working temperature for Hastelloy B-2 needs to be controlled within the range of 1160℃～900℃. Rapid heating to the required temperature is crucial to prevent the precipitation of the Ni4Mo phase (β phase), which would make the material brittle. The final forging temperature needs to be controlled above 900℃; this experience comes from our processing plant's test data.
2. Cold Forming (Stamping, Bending):
Difficulty: B-2 has a very fast work hardening rate, making cold forming difficult.
Solution:
It must be in the annealed state (hardness ≤ HRB 100 is best for cold forming), large-radius bending operations, and using high-viscosity lubricating oil specifically for nickel-based alloys.
3. Machining (Cutting, Milling/Turning):
Difficulty: B-2 is both"sticky"and"hard,"with rapid work hardening and poor thermal conductivity, resulting in heat accumulation on the cutting edge.
Solution:
Use rigid equipment, hard cutting tools, and a large depth of cut. It should also be kept slick with a high flow rate of coolant, with soluble oil lubrication preferred.
4. Welding (This is B-2's strength):
Advantages of B-2: Due to its extremely low carbon and silicon content, carbide precipitation is less likely in the weld heat-affected zone, resulting in good corrosion resistance even in the as-welded state. This is where it surpasses older B alloy grades.
Operating Points:
Pre-welding condition: The base metal must be in an annealed state. The welding area should be ground to a bright metal finish and degreased.
Welding method: TIG welding (GTAW). Pulsed current TIG welding yields better results, refining grain structure and improving joint performance.
Welding material selection: ERNiMo-7 welding wire.
Interpass temperature: Strictly controlled below 120℃. The next pass should only be welded when the temperature is still palpable but not hot to the touch.
Post-weld treatment: Generally, heat treatment is not required. If stress relief is needed, rapid annealing at 1066℃ followed by quenching can be performed.
Advantages of B-2: Due to its extremely low carbon and silicon content, carbide precipitation is less likely in the weld heat-affected zone, resulting in good corrosion resistance even in the as-welded state. This is where it surpasses older B alloy grades.
Operating Points:
Pre-welding condition: The base metal must be in an annealed state. The welding area should be ground to a bright metal finish and degreased.
Welding method: TIG welding (GTAW). Pulsed current TIG welding yields better results, refining grain structure and improving joint performance.
Welding material selection: ERNiMo-7 welding wire.
Interpass temperature: Strictly controlled below 120℃. The next pass should only be welded when the temperature is still palpable but not hot to the touch.
Post-weld treatment: Generally, heat treatment is not required. If stress relief is needed, rapid annealing at 1066℃ followed by quenching can be performed.
