Hastelloy B4 is a big deal in tough situations. When you need a material that can handle seriously harsh acids, you can’t rely on standard stainless steel pipes and stainless steel pipe fittings. That’s a recipe for disaster. Instead, you turn to something like Hastelloy B4. Its unique properties are what make it so reliable.
What is Hastelloy B4 | UNS N10629
Hastelloy B4 is a special kind of metal, it is an nickel-based alloy of nickel and molybdenum,which belongs to the Hastelloy family. This combination gives it incredible power. It can fight off strong acids like hydrochloric and sulfuric acid. What’s more, it’s super stable. This means its properties don’t change much, even when it gets hot.
Key Advantages of Hastelloy B4
Hastelloy B4 is built to resist non-oxidizing acids. It’s a champion against hydrochloric acid. It also stands up to sulfuric acid. This makes it perfect for chemical plants.
This alloy doesn’t change easily. The heat from welding won’t mess up its corrosion resistance. This means your pipes and fittings stay strong. You get a reliable, long-lasting system.
For such a tough material, it’s surprisingly easy to fabricate. You can form it and weld it without major issues. This is a big help for complex projects.
Hastelloy B4 is excellent at resisting stress corrosion cracking. This is a type of failure where tiny cracks form and grow. It’s crucial for safety in high-stress environments.
Chemical Composition
| Element | Ni | Mo | Cr | Fe | Co | Mn | Si | C |
|---|---|---|---|---|---|---|---|---|
| Content (wt%) | Balance | 27.0 – 31.0 | 1.0 – 3.0 | 1.0 Max | 2.0 Max | 1.0 Max | 0.05 Max | 0.01 Max |
Mechanical Properties
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness | Density |
|---|---|---|---|---|---|
| Value (Typical) | ≥760MPa(110ksi) | ≥350MPa(51ksi) | ≥40 | ≤210 | 9.22g/cm³ |
Hastelloy B3 VS Sensitized Stainless Steel
| Property | Hastelloy B4 (Welded) | Sensitized Stainless Steel (Welded) |
|---|---|---|
| Corrosion Resistance | Excellent | Bad (near the weld) |
| Weld Zone | Strong, dependable | Brittle, weak |
| Vulnerability | Low | High |
Where You'll Find Hastelloy B4
- Chemical Plants: You’ll find it in equipment that handles tough chemicals. It’s a perfect fit for processes using hydrochloric and sulfuric acids.
- Pollution Control: It’s used in systems that clean up industrial pollution. It resists the strong acids found in flue gases.
- Farming Chemicals: The alloy is used to handle strong pesticides and fertilizers. It resists a wide range of chemicals.
- High-Temp Parts: It’s a great choice for parts that get hot. It keeps its properties at high temperatures.
- Piping Systems: For critical stainless steel pipe fittings, Hastelloy B4 provides extreme corrosion resistance. It keeps your system working perfectly.
Sourcing and Fabricating Hastelloy B3
Always ask for a Material Test Report (MTR). This proves the material is what it should be.
Work with specialized suppliers of stainless steel pipe and fittings. They understand these alloy steels and can ensure proper fabrication and quality control,and are ISO 9001 and CE-PED certified.
This alloy needs specific welding methods. Make sure your team knows how to handle it.
It’s more expensive upfront. But it lasts much longer. This saves you money in the long run.
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