Hastelloy G-35 (UNS N06035 / W.Nr. 2.4643)
Hastelloy G-35 (UNS N06035 / W.Nr. 2.4643) is a nickel-chromium-molybdenum alloy designed to resist “wet process” phosphoric acid, which is used in the production of fertilizers. Similar to Hastelloy G-30, Hastelloy G-35 alloy also has excellent resistance to localized attack in the presence of chlorides, since this can be a problem beneath deposits in evaporators used to concentrate “wet process” phosphoric acid. Besides, it is much less susceptible to chloride-induced stress corrosion cracking than the stainless steels and nickel-chromium-iron alloys traditionally used in “wet process” phosphoric acid.
Due to the high chromium content, Hastelloy G-35 is extremely resistant to other oxidizing acids, such as nitric, and mixtures containing nitric acid. It possesses moderate resistance to reducing acids, as a result of its appreciable molybdenum content and unlike other Ni-Cr-Mo alloys, it is very resistant to “caustic dealloying” in hot sodium hydroxide.
Equivalent Grades
Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
Hastelloy G-35 | – | – | Hastelloy G-35 | N06035 | NiCr33Mo8 | 2.4643 | – | – | – | – |
Chemical Composition, %
Alloy | C | Si | Mn | P | S | Cr | Ni | Co | Mo | W | Al | Cu | V | Fe |
Hastelloy G-35 | ≤0.05 | ≤0.60 | ≤0.50 | ≤0.03 | ≤0.015 | 32.25-34.25 | Bal | ≤1.00 | 7.6-9.0 | ≤0.60 | ≤0.40 | ≤0.30 | ≤0.20 | ≤2.0 |
Typical Physical and Mechanical Properties (RT, Solution annealed)
Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HB |
8.22 | 1332-1361 | 710 | 317 | 66 | – |
Available Products and Specifications
Rod, Bar, Wire and Forgings | ASTM B462, ASTM B472, ASTM B564, ASTM B574, ASME SB462, ASME SB472, ASME SB564, ASME SB574 |
Plate, Sheet and Strip | ASTM B575, ASME SB575 |
Pipe and Tube | ASTM B619, ASTM B622, ASTM B626, ASME SB619, ASME SB622, ASME SB626 |
Welding Product | AWS A5.14 ERNiCrMo-22, ASME Ⅱ SFA-5.14 ERNiCrMo-22, ASME Ⅸ F-No.43 |
Others | ASTM B366, ASTM B462, ASME SB366, ASME SB462, DIN 17744 |
Features
- Excellent resistance to chloride pitting and creative corrosion cracking
- Immune to chloride ion stress corrosion
- Maintains high strength at elevated temperatures
- Resistant to sea water, in both flowing and stagnant condition
- Heat resistant
Applications
- Marine engineering
- Furnace & gas turbines
- Chemical processing involving phosphoric acid, sulfuric acid and nitric acid
- Nuclear fuel reprocessing, nuclear waste processing
- Pickling operations
- Petrochemical
- Fertilizer manufacture
- Pesticide manufacture
- Gold ore extraction