comparative c276,400-600- Shanghai Toko Technology Co.,Ltd

Alloy Comparison Table (Including Mechanical Strength & Welding Processes)**

Key Composition & Mechanical Strength

Property	Hastelloy C276	Monel 400	Inconel 600
Base Elements	Ni (~58%), Mo (15–17%), Cr (15%)	Ni (63–70%), Cu (28–34%)	Ni (≥72%), Cr (14–17%), Fe (6–10%)
Tensile Strength	690–890 MPa (annealed)	450–880 MPa (annealed)	550–1100 MPa (annealed)
Yield Strength	310–415 MPa (annealed)	170–520 MPa (annealed)	240–690 MPa (annealed)
Elongation	≥40%	≥30%	≥30%
High-Temperature Strength	Significant strength loss above 600°C	Stable up to 538°C	High creep resistance at 540–815°C

Welding Processes & Considerations

Category	Hastelloy C276	Monel 400	Inconel 600
Suitable Methods	TIG, MIG, laser welding	TIG, MIG, brazing	TIG, MIG, resistance welding
Filler Materials	ERNiCrMo-4 (matching wire)	ERNiCu-7 (Monel 60 wire)	ERNiCr-3 (Inconel 82/625 wire)
Key Controls	1. Low heat input to avoid σ-phase precipitation 2. Post-weld solution treatment (1065°C water quenching)	1. Avoid sulfur contamination (sulfide embrittlement) 2. Pre-weld oxide removal	1. Post-weld annealing (prevents sensitization) 2. Avoid prolonged high-temperature exposure
Common Defects	Hot cracking (due to high Mo content)	Porosity (from copper oxidation)	Intergranular corrosion (sensitized zones)

Core Advantages & Disadvantages

Alloy	Advantages	Disadvantages
Hastelloy C276	1. Superior resistance to strong acids (HCl, H₂SO₄) 2. Excellent pitting/crevice corrosion resistance	1. Extremely high cost 2. Poor high-temperature strength 3. Severe work hardening
Monel 400	1. Best for seawater/HF resistance 2. Excellent ductility at low/high temps 3. Cost-effective	1. Vulnerable to oxidizing acids (HNO₃) 2. Prone to sulfide-induced embrittlement
Inconel 600	1. High-temperature oxidation resistance (≤1177°C) 2. Resists chloride stress corrosion 3. Stable under nuclear radiation	1. Poor resistance to reducing acids 2. Sensitization risk (425–815°C) 3. Hydrogen embrittlement susceptibility

Application Recommendations

1. **Extreme Strong Acid Environments (e.g., chemical reactors):**

· Hastelloy C276 (HCl/H₂SO₄) > Monel 400 (HF only) > Inconel 600 (not suitable).

2. **High-Temperature Oxidation (e.g., heat treatment furnaces):**

· Inconel 600 (oxidation resistance) > Hastelloy C276 (weak strength) > Monel 400 (limited to 538°C).

3. **Marine/Offshore Engineering:**

· Monel 400 (seawater corrosion) > Inconel 600 (Cl⁻ stress corrosion) > Hastelloy C276 (high cost).

Summary

· Mechanical Strength: Inconel 600 > Hastelloy C276 > Monel 400 (high-temperature); Hastelloy C276 has the highest room-temperature strength.

· Weldability: Monel 400 (easiest) > Inconel 600 (requires post-treatment) > Hastelloy C276 (complex process).

· Cost: Monel 400 (lowest) > Inconel 600 (moderate) > Hastelloy C276 (highest).

For further details (e.g., fatigue strength, specific welding parameters), provide specific operating conditions for tailored analysis.