Products Features
Exceptional Resistance to Reducing Acid Corrosion
High molybdenum content (27–32%) endows Hastelloy B-3 with near-perfect corrosion resistance in reducing media such as hydrochloric acid, dilute sulfuric acid, and phosphoric acid, far surpassing conventional austenitic stainless steels and most nickel-based alloys.
Excellent Hydrochloric Acid Corrosion Resistance
It remains stable in full-concentration hydrochloric acid below boiling point, with no tendency for pitting or intergranular corrosion. It also withstands non-oxidizing acids such as hydrogen chloride gas, formic acid, and acetic acid.
Enhanced Thermal Stability
Compared to B-2, B-3 significantly reduces the precipitation rate of harmful intermetallic phases (such as Ni₄Mo) during hot working and welding through precise control of elements like iron, chromium, aluminum, and titanium. This results in better intergranular corrosion resistance in the as-welded condition and reduced sensitivity to thermal history.
Good Intergranular Corrosion Resistance
Ultra-low carbon content (≤0.01%) and optimized alloy design significantly reduce the risk of carbide and harmful phase precipitation in the weld heat-affected zone. It can be used in most corrosive environments in the as-welded condition without requiring post-weld heat treatment.
Moderate Resistance to Sulfuric and Phosphoric Acids
It performs well in sulfuric and phosphoric acids at moderate concentrations or lower, especially in non-oxidizing acid solutions containing chlorides or fluorides.
Good Formability and Weldability
It can be formed by conventional hot and cold working processes and has good weldability (GTAW, GMAW, SMAW). It is recommended to use matching Hastelloy B-3 filler wire. Oxidizing atmospheres (such as nitric acid or oxygen-containing solutions) should be avoided, as they significantly increase corrosion rates.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
Remaining quantity(≥65%) |
Matrix elements that provide corrosion resistance |
|
Mo |
27.0 – 32.0% |
Core components that provide acid resistance |
|
Fe |
1.5 – 3.0% |
Improve hot workability, but strict control is required |
|
Cr |
1.0 – 3.0% |
Add a small amount to enhance adaptability in moderately oxidative environments |
|
Co |
≤ 3.0% |
Impurities or permissible additives |
|
C |
≤ 0.01% |
Ultra-low carbon content, preventing intergranular corrosion |
|
Si |
≤ 0.10% |
w silicon content to prevent intergranular corrosion tendency |
|
Al |
≤ 0.50% |
Deoxidizing and stabilizing elements |
|
Ti |
≤ 0.20% |
Stabilizing elements to reduce the precipitation of harmful phases |
|
Mn |
≤ 3.0% |
A small amount of oxygen absorber |
|
P |
≤ 0.030% |
Impurity elements |
|
S |
≤ 0.010% |
Prevent hot brittleness |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
9.22 g/cm³ |
Room temperature (20°C) |
|
Melting Point |
1370 – 1418°C |
- |
|
Coefficient of Thermal Expansion (20-100°C) |
13.6 × 10⁻⁶ /K |
- |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 760 MPa |
ASTM B333 / B622 |
|
Strength (0.2% Offset) |
≥ 350 MPa |
ASTM B333 / B622 |
|
Elongation |
≥ 40% |
ASTM B333 / B622 |
|
Hardness |
≤ 100 HRB |
- |
High-temperature performance
Hastelloy B-3 is primarily designed for moderately low-temperature reducing corrosive environments (long-term use at ≤ 450°C). Its corrosion resistance drops sharply in oxidizing atmospheres (such as oxygen-containing solutions or nitric acid) and is not recommended for oxidizing media. However, compared to B-2, B-3 has slightly improved tolerance to trace oxidizing impurities due to its small chromium content.
Pitting Resistance Equivalent (PREN): PREN = %Cr + 3.3×%Mo + 16×%N. With a lower chromium content (1–3%), the PREN value typically ranges between 10–20, making it unsuitable for oxidizing environments containing chlorides. This alloy is not designed for pitting resistance but focuses on uniform corrosion resistance in reducing acids.
Critical Pitting Temperature (CPT): Not applicable (not resistant to corrosion in chloride-containing oxidizing environments).
Suitable Media:
Hydrochloric acid (all concentrations, below boiling point)
Dilute sulfuric acid (≤60% concentration)
Phosphoric acid (non-oxidizing conditions)
Organic acids such as formic acid, acetic acid, and propionic acid
Hydrogen chloride gas (dry or reducing conditions)
Chemical media for acetic acid synthesis, pesticide synthesis, etc.
Note: Prohibited for use in strongly oxidizing media such as nitric acid, hydrochloric acid containing iron/copper ions, and oxygen-containing solutions.
Hastelloy B-3 is specifically designed for corrosive environments involving moderately low-temperature reducing acids. It is recommended for use in the following areas:
Application Fields
-
Hydrochloric Acid Handling Equipment: Storage tanks, heat exchangers, towers, pumps, valves, and piping.
-
Acetic Acid/Synthesis: Reactors, distillation columns, reboilers.
-
Pesticide Production: Synthesis equipment for chlorinated/fluorinated pesticide intermediates.
-
Phosphoric Acid Concentration: Non-oxidizing phosphoric acid evaporators and heaters.
-
Formic Acid/Propionic Acid Plants: Corrosion-resistant components for organic acids.
-
Chlor-Alkali Industry: Hydrogen chloride gas coolers, drying towers.
-
Fine Chemicals: Reactors and agitators operating in reducing acid environments.
-
Pharmaceutical Industry: Synthesis of certain acidic drug intermediates.
-
Flue Gas Desulfurization (FGD): Limited to absorber zones under non-oxidizing conditions only.
-
Metal Acid Pickling: Hydrochloric acid pickling tanks and associated equipment.
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Hastelloy B-3 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
|
Customization Capability |
Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting |
Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions |
Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length) |
Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films |
Special surface treatment, precision drawing |
Why Choose Us? - Reliable engineering technology. Dependable delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of Hastelloy B-3?
Q: What heat treatment is required for Hastelloy B-3?
Q: What is the maximum service temperature?
Q: What is the difference between it and Hastelloy B-2?
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