Hastelloy B3
Hastelloy B-3 is a nickel-molybdenum alloy developed by Haynes International, specifically engineered to withstand strong reducing corrosive environments. By optimizing the chemical composition of the B-series alloys, B-3 maintains exceptional resistance to hydrochloric and sulfuric acid corrosion while significantly improving thermal stability and intergranular corrosion resistance, making it an ideal choice for chemical, pharmaceutical, and energy industries.
Hastelloy B-3 (UNS N10675) Comprehensive Analysis of High-Performance Nickel-Based Alloy
Material Overview
Hastelloy B-3 is a nickel-molybdenum alloy developed by Haynes International, specifically engineered to withstand strong reducing corrosive environments. By optimizing the chemical composition of the B-series alloys, B-3 maintains exceptional resistance to hydrochloric and sulfuric acid corrosion while significantly improving thermal stability and intergranular corrosion resistance, making it an ideal choice for chemical, pharmaceutical, and energy industries.
Core Characteristics
Chemical Composition (wt%)
Ni(Balance), Mo(28.5-31.5%), Cr(1.0-3.0%), Fe(1.0-3.0%), Co≤3.0%
Low-carbon design (C≤0.01%) effectively suppresses carbide precipitation
Corrosion Resistance
▶ Withstands all concentrations of HCl at 40°C
▶ Corrosion rate <0.1mm/year in ≥95% concentrated H2SO4 at 70°C
▶ Resists phosphoric acid, acetic acid, and chloride stress corrosion cracking (SCC)
Mechanical Properties (Solution-Annealed)
▶ Tensile Strength ≥760 MPa
▶ Yield Strength ≥350 MPa
▶ Elongation ≥40%
Performance Comparison with Similar Alloys
|
Property |
B-3 |
B-2 (UNS N10665) |
B-4 (UNS N10629) |
|
HCl Resistance |
Excellent |
Excellent |
Excellent |
|
Intergranular Corrosion Resistance |
⭐⭐⭐⭐ |
⭐⭐ (Weld Sensitive) |
⭐⭐⭐ |
|
Thermal Stability |
Stable up to 650°C |
Phase Precipitation at 600°C |
Stable up to 620°C |
|
Cold Workability |
Excellent (Low Work Hardening) |
Moderate |
Good |
|
Weldability |
No Post-Weld Heat Treatment Required |
Requires Solution Annealing |
Requires Local Heat Treatment |
Typical Applications
- Hydrochloric acid regeneration reactors
- Sulfuric acid concentration evaporators
- Titanium dioxide production lines in hydrometallurgy
- Nuclear fuel reprocessing equipment
Selection Guidance
In reducing acid environments (e.g., HCl, H2SO4) at temperatures ≤100°C, B-3 demonstrates 2-3 times longer service life than B-2. For applications with thermal cycling, its thermal stability significantly outperforms B-4 alloy.
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International Designations
|
Country/Standard |
Designation |
|
UNS (USA) |
N10675 |
|
EN (Europe) |
NiMo29Cr |
|
JIS (Japan) |
HASTELLOY B-3 |
|
GB (China) |
NS3203 |
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