Products Features

Excellent Oxidation Resistance and Wet Phosphoric Acid Corrosion Capability (Upgraded from G-30)

The high chromium content (approximately 33%) enables outstanding performance in oxidizing acids (such as nitric acid, sulfuric acid containing Fe³⁺/Cu²⁺) and oxidizing-reducing mixed acids. Particularly in wet phosphoric acid (containing sulfuric acid, fluoride, and chloride impurities), its corrosion resistance far exceeds that of G-30, 625 alloy, and even C-276. In practical service condition tests, G-35 exhibits far superior corrosion resistance to other metal materials in this medium.

Excellent resistance to localized corrosion and stress corrosion cracking.

As an upgraded product of G-30, G-35 offers better resistance to localized corrosion and chloride-induced stress corrosion cracking in chloride-containing media. In the ASTM G-36 45% boiling magnesium chloride stress corrosion cracking test, G-30 cracked after 168 hours, while G-35 remained crack-free after 1008 hours, demonstrating significant performance advantages.

Good welding and machinability performance.

The ultra-low carbon design effectively reduces the precipitation of intergranular carbides during welding or sensitization treatment. Compared to high-molybdenum alloys such as C-276, G-35 has a lower tendency to precipitate harmful phases after long-term use at high temperatures, is less prone to intergranular corrosion in the weld heat-affected zone, and generally does not require special post-weld heat treatment. It can be cold and hot formed using conventional processes, exhibits excellent welding properties (suitable for GTAW, GMAW, SMAW, etc.), and is convenient for manufacturing complex equipment.

Technical Specifications

Chemical Composition

Element	Standard Requirements	Notes
Ni	Remaining quantity(≥58%)	Matrix elements that provide austenitic structure stability and stress corrosion cracking resistance
Cr	33.2%	Chromium with extremely high content forms a dense passivation film in oxidizing acids and media containing oxidizing agents, which is the core element of G-35's oxidation corrosion resistance.
Fe	≤ 2.0%	The iron content is much lower than that of G-30, effectively improving the stability of the passivation film and enhancing overall corrosion resistance
Mo	8.1%	Significantly enhanced resistance to reducing acids (such as dilute sulfuric acid and hydrochloric acid) as well as pitting corrosion and crevice corrosion
W	≤ 0.6%	Acting in synergy with molybdenum to further enhance resistance to localized corrosion
Cu	≤ 0.3%	Extremely low copper content, optimized alloy performance in specific media
Co	≤ 1.0%	Strict control to ensure organizational stability
C	≤ 0.05%	Ultra-low carbon content, which minimizes the precipitation of intergranular carbides and optimizes welding performance
Mn	≤ 0.5%	Deoxidizer, improve hot working properties
Si	≤ 0.6%	Deoxidizer
Al	≤ 0.4%	Auxiliary deoxygenation and stabilization
P	≤ 0.040%	Impurity elements
S	≤ 0.020%	Prevent hot brittleness

Physical Properties

Property	Value/Range	Test Conditions
Density	8.22 g/cm³	Room temperature (20°C)
Melting Point	1370 - 1400°C	-
Coefficient of Thermal Expansion (20-100°C)	12.8 × 10⁻⁶ /K	-
Elastic modulus (Young's modulus)	200 - 205 GPa	Room temperature
Thermal Conductivity (20°C)	10.5- 11.0 W/(m·K)	-
Resistivity	1.25 μΩ·m	Room temperature (20°C)

Mechanical Properties (Annealed Condition, Typical Values)

Property	Typical Value	Specification
Tensile Strength	≥ 690 MPa	ASTM B582 / B581 / B622
Yield Strength	≥ 310 MPa	ASTM B582 / B581 / B622
Elongation	≥ 40%	ASTM B582 / B581 / B622
Hardness	≤ 97 HRB	-

High-temperature performance

Antioxidant Performance:

It exhibits excellent oxidation resistance in high-temperature oxidizing atmospheres. With a chromium content as high as approximately 33%, G-35 can rapidly form a dense Cr₂O₃ passivation film in strongly oxidizing media, maintaining good oxidation stability even above 500°C. This alloy is primarily designed for medium-to-low temperature corrosive environments (long-term use up to ≤ 400°C), but compared to G-30 and C-276, G-35 has a lower tendency to precipitate harmful phases after long-term high-temperature use.

Pitting Resistance Equivalent (PREN): PREN = %Cr + 3.3×%Mo ≈ 33 + 3.3×8 ≈ 59, which is significantly higher than G-30 (approximately 41-51) and 316L (approximately 25). The combination of high chromium and molybdenum endows it with exceptional resistance to pitting and crevice corrosion, particularly outstanding comprehensive stability in acidic environments containing chloride and fluoride ions.

Critical Pitting Temperature (CPT): It demonstrates excellent resistance to localized corrosion in phosphoric acid, sulfuric acid, and mixed acids containing chloride ions. The CPT value is superior to that of G-30 and most super austenitic stainless steels.

Applicable Media:

1. Wet Phosphoric Acid (containing sulfuric acid, fluoride, and chloride impurities) - G-35's most classic application area

2. Nitric Acid and Its Mixtures (nitric acid/hydrochloric acid, nitric acid/hydrofluoric acid) - G-35 exhibits excellent corrosion resistance to strongly oxidizing environments containing nitric acid

3. Sulfuric Acid (moderate concentration, especially when containing oxidants)

4. Acidic Solutions Containing Halides

5. Nuclear Fuel Reprocessing Media

6. Flue Gas Desulfurization (FGD) Slurries

7. Hot Sodium Hydroxide Solutions - G-35 effectively resists caustic dealloying corrosion

Upgraded version of G-30, Hastelloy G-35 is designed for strongly oxidizing and mixed acid corrosion environments and is recommended for the following fields:

Application Fields

Fertilizer Industry (Wet Phosphoric Acid): Evaporator tubes, heat exchangers, reactor linings, and piping systems (the classic application area for G-35, which can resist corrosive phosphoric acid containing fluorides and chlorides. In tests with three concentrations of wet phosphoric acid-36%, 48%, and 54%-G-35 demonstrated significantly better corrosion resistance than G-30 and stainless steel)
Chemical Processing: Equipment for nitric acid and nitric/hydrofluoric acid mixed acid treatment, pickling equipment, reactors, and tanks
Nuclear Industry: Nuclear fuel reprocessing, nuclear waste handling, and tank and piping systems in nitric acid-based media
Flue Gas Desulfurization (FGD): Scrubber towers, chimney linings, and piping systems, resistant to corrosion from wet flue gases containing SO₂ and Cl⁻
Petrochemicals: Reactors, heat exchangers, and piping systems involving strongly oxidizing media and chloride-containing environments
Environmental Equipment: Acidic wastewater treatment and exhaust gas purification systems
Pharmaceutical and Pesticide Industries: Reactors and piping involved with complex chemicals and strongly oxidizing media
Hydrometallurgy: Acid leaching extraction equipment for metals such as copper, cobalt, and zinc, and linings for acidic leaching reactors
Caustic Soda Neutralization Systems: G-35 exhibits excellent resistance to dealloying corrosion in hot sodium hydroxide solutions
Gold Mining Extraction: Treatment equipment for cyanide and acidic media

Delivery and Customization

We offer flexible and reliable supply chain solutions to ensure you receive Hastelloy G-35 materials that perfectly match your project requirements.

Form	Sheet/Plate	Bar/Rod	Seamless Pipe	Strip/Sheet Coil	Wire/Wire Rod
Conventional Range	Thickness: 0.5 - 100 mm Width: ≤ 1500 mm Length: Customizable	Diameter Φ6-500mm	Outer diameter Φ10-300mm	Thickness: 0.1 – 3.0 mm Width: 10 – 600 mm	Diameter Φ0.5-10mm
Customization Capability	Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting	Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions	Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length)	Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films	Special surface treatment, precision drawing

Why Choose Us? - Reliable engineering technology. Dependable delivery.

We are not just a supplier, but a trusted materials partner for you in China.

Vertically Integrated Production

Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.

Strict Quality Control at Every Stage

Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.

Reliable Delivery & Export Packaging

10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.

Sample Validation Before Mass Production

We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.

FAQ

Q: What are the main advantages of Hastelloy G-35?

Q: What heat treatment is required for Hastelloy G-35?

Q: What is the maximum service temperature?

Q: What is the difference between it and Hastelloy G-30?

Comparison Items	Hastelloy G-35	Hastelloy G-30
Core Composition	High chromium nickel-based alloy Contains 33.2% Cr, 8.1% Mo Extremely low iron content (≤2%) Nickel content approximately 58% (balance)	Nickel-Chromium-Iron Base Alloys Contain 28-31.5% Cr, 4-6% Mo High iron content (13-17%) Contains niobium for stabilization
Core Advantages	The fully upgraded version of G-30 • Offers significantly better corrosion resistance than G-30 in wet phosphoric acid, making it the preferred material for this medium • Possesses extremely high stress corrosion cracking resistance-no cracking after 1008 hours (compared to 168 hours for G-30) • Exhibits superior high-temperature microstructural stability, eliminating the need for post-weld heat treatment • Superior resistance to caustic dealloying corrosion, with excellent performance in hot sodium hydroxide solutions	Expert in Oxidizing and Mixed Acid Environments • Performs exceptionally well in wet-process phosphoric acid, nitric acid, and mixed acids, far exceeding stainless steel • Ultra-low carbon and niobium-stabilized design ensures excellent intergranular corrosion resistance after welding • Good resistance to pitting and crevice corrosion
Selection Recommendations	Recommended for more demanding corrosive environments: • Wet phosphoric acid production (G-35 is the optimal choice, especially for evaporator tube bundles) • Applications with extremely high requirements for stress corrosion cracking resistance • Caustic soda neutralization systems and processes involving hot sodium hydroxide • Nitric acid and nitric/hydrofluoric acid mixtures (nuclear fuel reprocessing, stainless steel pickling) • Applications requiring superior high	Recommended for applications involving oxidative or mixed acid environments: • Wet phosphoric acid production (for scenarios with relatively lower performance requirements) • Nitric acid and nitric acid/hydrofluoric acid mixed acids • Sulfuric acid environments containing oxidants • Post-welding situations where heat treatment is not possible • Fertilizer, nuclear industry, and environmental protection fields