UNS N06035 G-35, also known as Hastelloy G-35, is a nickel-chromium-molybdenum alloy designed to resist "wet process" phosphoric acid used in fertilizer production. Similar to Hastelloy G-30, it exhibits excellent resistance to localized corrosion in the presence of chlorides, which can be a problem under deposits in evaporators used to concentrate "wet process" phosphoric acid. In addition, it is significantly less sensitive to chloride-induced stress corrosion cracking compared to traditional stainless steels and nickel-chromium-iron alloys used in "wet process" phosphoric acid. Due to its high chromium content, Hastelloy G-35 has excellent resistance to other oxidizing acids (such as nitric acid) and nitric acid-containing mixtures. It also has moderate resistance to reducing acids and, unlike other Ni-Cr-Mo alloys, it has strong resistance to "caustic gouging" in hot sodium hydroxide. It maintains high strength at elevated temperatures and is resistant to chloride ion stress corrosion.
The applications of Hastelloy G-35 include wet process phosphoric acid production evaporators, pickling equipment using nitric acid, caustic soda neutralization systems, and chemical systems involving nitric acid and chlorides.
1. Chemical Composition Requirements of Hastelloy G-35
| The Chemical Composition of Hastelloy G35, % |
| Ni |
Balance |
| Mo |
7.60-9.00 |
| Cr |
32.25-34.25 |
| Fe |
≤2.00 |
| W |
≤0.60 |
| Co |
≤1.00 |
| C |
≤0.05 |
| Si |
≤0.60 |
| Mn |
≤0.50 |
| V |
≤0.20 |
| P |
≤0.30 |
| S |
≤0.015 |
| Al |
≤0.40 |
| Cu |
≤0.30 |
2. Typical Physical Properties
| Density |
Thermal Conductivity |
Specific Heat |
Melting Range |
| g/cm3 |
W/m.k |
J/kg. k |
°C |
| 8.22 |
10 |
450 |
1332-1361 |
3.Product Forms and Standards
| Product Form |
Standard |
| Sheet, Plate & Strip |
ASTM B575 |
| Billet, Rod & Bar |
ASTM B574, B472 |
| Coated Electrodes |
ASTM A5.11 |
| Bare Welding Rods & Wire |
ASTM A5.14 |
| Seamless Pipe & Tube |
ASTM B622 |
| Welded Pipe & Tube |
ASTM B619, B626 |
| Fittings |
ASTM B366, B462 |
| Forgings |
ASTM B564, B462 |
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