1. Introduction:

Hastelloy B-2 (UNS N10665) is a nickel-molybdenum alloy renowned for its exceptional resistance to reducing environments. Let’s delve into its key features, techniques, and industrial applications:

2. Characteristics:

1. Corrosion Resistance:
   • Hastelloy B-2 provides significant resistance to:
     • Hydrogen chloride gas
     • Sulfuric acid
     • Acetic acid
     • Phosphoric acid
   • It excels in non-oxidizing acid environments.
   • Avoid oxidizing media or iron/copper presence in hydrochloric acid systems to prevent premature failure.
2. Heat-Affected Zones:
   • Resists grain boundary carbide precipitates in weld heat-affected zones.
   • Suitable for most chemical process applications in the as-welded condition.
3. Pitting and Stress Corrosion Cracking:
   • Demonstrates excellent resistance to pitting and stress corrosion cracking.

3. Techniques:

• Formability: Hastelloy B-2 can be formed with proper precautions.
• Welding: Uniform corrosion resistance due to reduced carbide precipitation in weld zones.

4. Applications:

• Chemical Process Industry:
  • Sulfuric, phosphoric, hydrochloric, and acetic acid handling.
• High-Temperature Strength:
  • Suitable for inert and vacuum atmospheres.
• Acetic Acid Production:
  • Resists strongly reducing chemicals.

Remember, Hastelloy B-2 (UNS N10665) combines resilience and corrosion resistance, making it a reliable choice for critical applications.