Hastelloy Alloy G-30/UNS N06030/W. Nr. 2.4603

PRODUCTS

CONTACT US

Hastelloy Alloy G-30/UNS N06030/W. Nr. 2.4603

Product Description

Hastelloy G‑30 is a nickel‑chromium‑iron superalloy engineered for outstanding resistance to “wet process” phosphoric acid (P₂O₅) and other oxidizing acids, while maintaining strength and durability in demanding chemical environments. At MWalloys, we supply custom G‑30 in plates, bars, rods, coils, wire, pipes, and covered electrodes—tailored to your process requirements.

What Is Hastelloy G‑30?

Hastelloy G‑30 (UNS N06030) is an evolution of Alloy G‑3, featuring higher chromium and additions of cobalt and tungsten for enhanced corrosion resistance in phosphoric, nitric, and other oxidizing acids.

Specifications & Parameters

Category Property Value / Specification Notes / Conditions
Chemical Composition Nickel (Ni) Balance (≥42%) Primary constituent
Chromium (Cr) 28.0–31.5% Key for oxidation resistance
Iron (Fe) 13.0–17.0%
Molybdenum (Mo) 4.0–6.0% Enhances corrosion resistance
Copper (Cu) 1.0–2.4% Critical for sulfuric/phosphoric acid resistance
Tungsten (W) 1.5–4.0%
Cobalt (Co) ≤5.0%
Manganese (Mn) ≤1.5%
Silicon (Si) ≤0.50%
Carbon (C) ≤0.03%
Physical Properties Density 8.9 g/cm³
Melting Range ~1350°C (2460°F) Estimated
Thermal Conductivity (100°C) 9.1–14.0 W/m·K
Electrical Resistivity 1.2 × 10⁻⁶ Ω·m
Coefficient of Thermal Expansion (20–100°C) 13.4–13.9 × 10⁻⁶/°C
Mechanical Properties Tensile Strength (RT, Annealed) 760–880 MPa (min: 524 MPa per ASTM) Higher range from industrial tests; ASTM min for annealed state
Yield Strength (0.2% Offset, RT) 350–450 MPa (min: 200 MPa per ASTM)
Elongation (RT) 35–45% (min: 62% per ASTM) ASTM min value is exceptional
Hardness (Annealed) 210–250 HB
Elevated-Temp Properties Tensile Strength (800°C) ~600 MPa
Yield Strength (800°C) ~280 MPa
Elongation (800°C) ~30%
Fatigue Life (300 MPa Stress) >10⁷ cycles
Heat Treatment Solution Annealing 1177°C (2150°F), rapid air/water cool Mandatory for all forged products
Corrosion Resistance Phosphoric/Sulfuric/Nitric Acids Excellent (superior to most Ni/Fe alloys)
Mixed Acids (e.g., HNO₃/HF, HNO₃/HCl) Exceptional resistance
Welded Joint Performance Resists grain-boundary precipitation
Fabrication Welding Methods GTAW, GMAW, SMAW (filler: ERNiCrMo-11/ENiCrMo-11) Avoid submerged arc welding
Cold Working Recommended (higher energy required vs. stainless steel)
International Standards Bar/Rod ASTM B581
Plate/Sheet ASTM B582
Seamless Tube ASTM B622
Welded Tube ASTM B619, B626
Forgings/Fittings ASTM B462, B366
Key Applications Chemical Processing Phosphoric/sulfuric/nitric acid reactors, pickling equipment
Nuclear Industry Fuel reprocessing, nuclear waste handling
Petrochemicals Fertilizer/pesticide production, gold ore extraction

🔑 Critical Notes & Variability Factors

  1. Mechanical Property Discrepancies:

    • Strength/Elongation: Industrial data (e.g., UTS 760–880 MPa) often exceeds ASTM minima (UTS ≥524 MPa). Higher values reflect optimized processing; ASTM values are conservative guarantees.

    • High-Temp Performance: Strength declines linearly with temperature (e.g., UTS drops 21% at 800°C vs. RT) but remains superior to standard stainless steels.

  2. Corrosion Performance Highlights:

    • Acid Blends: Uniquely resistant to aggressive mixtures (e.g., HNO₃/HF), making it ideal for acid cleaning and metal refining.

    • Welding Integrity: Low carbon/niobium content prevents sensitization in weld zones—critical for nuclear/pressure applications.

  3. Fabrication Constraints:

    • Cold Working: Requires 20–30% more power than 304 stainless due to higher work-hardening rate.

    • Thermal Stability: Prolonged exposure above 650°C may cause embrittlement; limit to 600°C for critical service.

  4. Standards Compliance:

    • Nuclear/chemical grades enforce strict Co/W/Cu ratios to avoid corrosion hotspots.

💎 Summary: Hastelloy® G-30 combines extreme acid resistance with robust high-temp strength, outperforming most alloys in oxidizing/acidic environments. Its weldability and ASTM-standardized reliability make it indispensable for nuclear, chemical, and mineral processing. For project-specific validation, consult ASTM B581/B582 directly.

global price comparison

Form China (USD/kg) Europe (USD/kg) USA (USD/kg) India (USD/kg)
Plate/Sheet 20 – 21 /kg
— Alibaba (min. 1 kg)
27 – 33 /kg 45 – 55 /kg (distributor quotes) 27 – 30 /kg
Bar / Rod 28 – 35 /kg
— Alibaba round bar listings
33 – 38 /kg 40 – 50 /kg (ASTM B581 stockists) 35 – 40 /kg
— Robust Special Metals
Coil / Strip 20 – 30 /kg (Alibaba coil listings) 30 – 35 /kg 45 – 55 /kg (heat‑exchanger coil suppliers) 40 – 45 /kg
Wire 20 – 25 /kg (spring & strip wire) 37 – 48 /kg 60 – 80 /kg (welding/design wire) 50 – 53 /kg

Key Sources & Notes:

  • China: Plate/sheet at US$20–21 /kg (min. 1 kg); bar/rod at US$28–35 /kg under ASTM B581.

  • India: Rod prices range $35–40 /kg (₹1,890–3,000/kg) for ASTM B581 round bars.

  • Europe & USA: Estimated distributor and mill‑stockist ranges, reflecting typical premiums for certified, low‑volume orders.

Tip: For precise factory‑direct quotes (including certifications like ASTM B575/B581, material test certificates, and surface finish), contact MWalloys for a 24‑hour turnaround.

Why Choose G‑30?

  • Exceptional Acid Resistance: Outperforms most nickel‑ and iron‑base alloys in phosphoric, nitric, and mixed acids.

  • Stress‑Corrosion Cracking Resistance: Less susceptible than stainless steels under chloride deposits.

  • Balanced Mechanical Strength: High tensile and yield strength combined with modest ductility.

  • Versatile Forms: Available as plate, bar, rod, coil, wire, tube, and electrode.

Manufacturing & Forming Alloy G‑30

We offer G‑30 in hot‑rolled, cold‑rolled, and solution‐annealed conditions. Typical fabrication guidelines:

  • Hot Working: 1,050–1,200 °C.

  • Cold Working: Increases strength; follow with solution anneal (1,200–1,250 °C).

  • Machining: Use rigid tooling and moderate feeds to manage work‑hardening.

Comparison with Similar Alloys

Property G‑30 Alloy 625 Alloy G‑3
Cr Content 30 % 20–23 % 22–24 %
Acid Resistance Superior (P₂O₅) Excellent Very good
Tensile Strength 1,096 MPa 1,030 MPa ~950 MPa
Chloride SCC Moderate Excellent Moderate
Primary Uses Phosphoric acid Marine, chemical Chemical, heat

Welding Practices

G‑30 welds via GTAW or GMAW using matching electrodes. Recommendations:

  • Preheat: Not required.

  • Interpass: < 150 °C.

  • Post‑weld: Solution anneal at 1,200 °C if service in severe acid environments.

FAQs

What makes Hastelloy® G‑30 especially resistant to “wet process” phosphoric acid?

G‑30’s high chromium content (30 wt %) forms a stable passive film that limits attack in 30–54 % P₂O₅ at 121 °C. It outperforms G‑3 and even Alloy 625 in these conditions, showing corrosion rates 2–10× lower than comparative alloys.

How does G‑30 perform in other oxidizing acids (e.g., nitric, sulfuric)?

Beyond phosphoric acid, G‑30 resists nitric and sulfuric acid mixtures thanks to added cobalt and tungsten—which enhance passivation—and molybdenum plus copper for localized attack resistance.

Is Hastelloy G‑30 susceptible to chloride-induced stress‑corrosion cracking?

No. G‑30 shows substantially lower cracking than austenitic stainless steels under ASTM G36 boiling magnesium‑chloride tests. Its nickel‑chromium matrix and lack of detrimental grain‑boundary precipitates in the as‑welded condition minimize SCC risk.

Can G‑30 be welded without losing corrosion resistance?

Yes. G‑30 welds via GTAW/GMAW with matching covered electrodes or wire. Its resistance to grain‑boundary precipitates in the weld‑heat‑affected zone means post‑weld annealing is typically unnecessary, even for critical acid services.

What industrial applications benefit most from Hastelloy G‑30?

Phosphoric acid evaporator tubes in fertilizer plants.

Nitric/hydrofluoric pickling hardware for stainless steel.

Heat‑exchanger tubing in mixed‑acid environments.

Furnace baskets and trays for oxidizing acids.
These uses leverage G‑30’s unique blend of strength, weldability, and superior resistance to highly oxidizing media.

References

Product Show

Message

Products Recommended

en_USEN