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Hastelloy G-35

Designated as UNS N06035 or DIN 2.4643, Hastelloy G-35 is a nickel-chrimium-molybdenum alloy designed to resist “wet process” phosphoric acid, which is used in the production of fertilizers. Similar to Hastelloy G-30, G35 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 de­-alloying” in hot sodium hydroxide.

Hastelloy G-35 hexagonal-section bars, ASTM B574.

Hastelloy G-35 hexagonal-section bars, ASTM B574.

1. Chemical Composition Requirements of Hastelloy G-35

The Chemical Composition of Hastelloy G35, %
NiBalance
Mo7.60-9.00
Cr32.25-34.25
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

DensityThermal ConductivitySpecific HeatMelting Range
g/cm3W/m.kJ/kg. k°C
8.22104501332-1361

3. Weldability, Heat Treatment & Workability

Hastelloy G-35 pressure vessel designed for an European client.

Hastelloy G-35 pressure vessel designed for an European client.

Gas metal arc(GMA/MIG), gas tungsten arc(GTA/TIG), and shielded metal arc(SMA/Stick) welding processes are applicable for the welding of Hastelloy G-35 alloys with relative filler metals. Hastelloy G-35 alloy can be hot forged, hot rolled, hot upset, hot extruded, and hot formed. However, it is more sensitive to strain and strain rates than the austenitic stainless steels, and the hot working temperature range is quite narrow. On the other hand, the referenced guideline of cold working is much stiffer than most austenitic stainless steels which means more energy is required during cold forming. After being worked, the alloy should be solution-annealed with the annealing temperature at 1122°C[2050°F].

4. Product Forms and Standards

Product FormStandard
Sheet, Plate & StripASTM B575
Billet, Rod & BarASTM B574, B472
Coated ElectrodesASTM A5.11
Bare Welding Rods & WireASTM A5.14
Seamless Pipe & TubeASTM B622
Welded Pipe & TubeASTM B619, B626
FittingsASTM B366, B462
ForgingsASTM B564, B462
*The mechanical properties vary according to different forms and heat treatment conditions.

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