Hastelloy® G-30 Alloy — Superior Corrosion Resistance for Aggressive Environments
Hastelloy® G-30 is a high-performance nickel-based alloy engineered to withstand severe corrosive and high-temperature environments. Its advanced chemical composition and robust mechanical properties make it an ideal material for chemical processing, oil & gas, marine engineering, and other demanding industries. Ruisen proudly offers precision-cut and custom-fabricated G-30 alloy products tailored to your critical applications.
1. Chemical Composition & Microstructure
2. Key Performance Benefits
Exceptional Corrosion Resistance
Strong Acid Environments: In wet-process phosphoric acid containing Cl⁻ and F⁻, G-30 exhibits a corrosion rate as low as 0.025–2.5 mm/year—2 to 10 times better than Alloy G-3 and Alloy 625. Outstanding resistance in nitric + hydrofluoric acid mixtures.
High-Temperature Stability: Performs reliably at 1000–1100°C with excellent oxidation resistance.
Stress Corrosion Cracking Resistance: Superior resistance to chloride-induced SCC, especially in marine and chloride-rich environments.
Outstanding Mechanical Properties
High Strength: Tensile strength of 760–870 MPa, yield strength of 345–415 MPa, with elongation of 40–45%.
Thermal Strength: Maintains mechanical integrity at elevated temperatures—outperforming conventional stainless steels.
Excellent Fabrication & Weldability
Formability: Supports both cold and hot working (stamping, bending, forging, rolling) with moderate work hardening.
Welding: Recommended processes include GTAW (TIG) and GMAW (MIG) with ERNiCrMo-11 filler metals. Avoid SAW (submerged arc welding) to minimize heat input. Post-weld solution annealing at 1177°C (air or water quench) restores corrosion resistance.
3. Typical Applications
Chemical Processing
Phosphoric Acid Production: Evaporators, reactors, and pipelines—particularly suited for fluoride-rich wet-process systems.
Acid Pickling Equipment: Ideal for nitric/hydrofluoric acid-based pickling tanks and heat exchangers.
Aggressive Media Handling: Tanks and reactors for sulfuric, nitric, and formic acid service.
Oil & Gas
Sour Gas Wells: Components exposed to H₂S and CO₂-rich environments.
Refinery Equipment: Reactors and separators operating under high pressure and temperature.
Marine Engineering
Seawater Systems: Desalination units and offshore platform piping, offering excellent chloride corrosion resistance.
Ship Components: Pumps, valves, and seawater-contacting parts.
Nuclear Industry
Waste Management: Storage containers and processing equipment for radioactive and corrosive materials.
4. Comparison with Other Alloys
5. Processing Notes
Work Hardening: Cold forming may induce stress; intermediate annealing is recommended.
Cutting Techniques: Use laser or waterjet cutting; avoid flame cutting to prevent surface oxidation.
Surface Preparation: Clean thoroughly before welding to eliminate oil and oxides and prevent weld defects.
6. Standards & Certifications
Hastelloy® G-30 complies with major international standards:
ASTM: B366 (fittings), B581 (bars), B619 (welded pipes)
Corrosion Standards: NACE MR0175 (for sour oil & gas environments)
Equivalent Grades:
UNS N06030 (ASTM)
DIN 2.4603 (Germany)
NS3404 (China)
Conclusion
With its high-chromium formulation and balanced alloying elements, Hastelloy® G-30 delivers unparalleled corrosion resistance and mechanical durability in extreme environments. Ruisen proudly supplies this premium alloy for mission-critical applications in chemical processing, energy, and marine sectors—ensuring long service life and performance reliability where it matters most.
For technical datasheets or project consultations, please contact Ruisen Special Steel.