Products Features
Excellent Oxidation and Mixed Acid Corrosion Resistance
The high chromium content (28-31.5%) enables superior performance in oxidizing acids (e.g., nitric acid, sulfuric acid with Fe³⁺/Cu²⁺) and oxidizing-reducing mixed acids, outperforming most other nickel-based and iron-based alloys. Its corrosion resistance in wet phosphoric acid (containing sulfuric acid, fluoride, and chloride impurities) is far superior to that of stainless steels and many traditional nickel-based alloys.
Superior Intergranular Corrosion and Weldability
A super low carbon content (≤0.03%) combined with niobium stabilization minimizes the precipitation of intergranular carbides during welding or sensitization treatment. This allows the alloy to be directly used in most chemical process applications in the as-welded condition without requiring complex post-weld heat treatment.
Excellent Resistance to Localized Corrosion
The synergistic effect of higher molybdenum (4-6%) and tungsten (1.5-4%) content provides outstanding resistance to pitting and crevice corrosion. It performs stably in acidic environments containing halide ions such as chloride and fluoride, outperforming many traditional stainless steels.
Good Formability and Weldability
It can be formed by conventional hot and cold working processes and exhibits excellent weldability (suitable for GTAW, GMAW, SMAW, etc.). With proper welding control, post-weld heat treatment is not required, facilitating the manufacture of complex equipment.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
Remaining quantity(≥43%) |
Matrix elements that provide austenite stability and stress corrosion resistance |
|
Cr |
28.0 - 31.5% |
High content provides excellent antioxidant and oxidation resistance to acid corrosion, forming a dense passivation film in nitric acid and oxidizing agent-containing media |
|
Fe |
13.0 - 17.0% |
Provide structural stability, adjust the coefficient of thermal expansion, and reduce costs |
|
Mo |
4.0 - 6.0% |
Enhance resistance to reducing acids (such as dilute sulfuric acid and hydrochloric acid) and improve resistance to pitting corrosion and crevice corrosion |
|
W |
1.5 - 4.0% |
Acting in synergy with molybdenum to further enhance resistance to localized corrosion and high-temperature stability |
|
Cu |
1.0 - 2.4% |
Significantly improved corrosion resistance in non-oxidizing acids such as sulfuric acid and phosphoric acid |
|
Co |
≤ 5.0% |
As an auxiliary strengthening element, it optimizes high-temperature strength and resistance to localized corrosion. |
|
Nb+Ta |
0.3 - 1.5% |
Stable carbides, enhancing sensitization resistance and intergranular corrosion resistance |
|
C |
≤ 0.030% |
Extremely low carbon content minimizes intergranular carbide precipitation to the greatest extent, optimizing welding performance. |
|
Mn |
≤ 1.5% |
Deoxidizer, improve hot working properties |
|
Si |
≤ 0.80% |
Deoxidizer |
|
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) |
202 - 205 GPa |
Room temperature |
|
Thermal Conductivity (20°C) |
10.2 - 10.8 W/(m·K) |
- |
|
Resistivity |
1.20 - 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 |
≤ 220 HB / ≤ 97 HRB |
- |
High-temperature performance
It exhibits good antioxidant capability in high-temperature oxidizing atmospheres. A continuous Cr₂O₃-Fe₃O₄ composite oxide film forms at 500°C in air, resulting in a low oxidation weight gain rate. However, this alloy is primarily designed for medium-to-low temperature corrosion environments (long-term use ≤ 400°C). Long-term exposure to the 450-650°C range requires consideration of the risk of harmful phase precipitation.
Pitting Resistance Equivalent (PREN): PREN = %Cr + 3.3×%Mo ≈ 28-31.5 + 3.3×4-6 ≈ 41-51. It demonstrates exceptional overall stability in acidic oxidizing environments containing halide ions.
Critical Pitting Temperature (CPT): CPT ≥ 55°C (ASTM G48 standard). It offers good resistance to localized corrosion in phosphoric acid, sulfuric acid, and mixed acid environments containing chloride ions.
Suitable Media:
1. Wet-process phosphoric acid (containing sulfuric acid, fluoride, and chloride impurities)
2. Nitric acid and its mixed acids (nitric acid/hydrochloric acid, nitric acid/hydrofluoric acid)
3. Sulfuric acid (moderate concentration, especially when containing oxidizers)
4. Acidic solutions containing halides
5. Nuclear fuel reprocessing media
6. Flue gas desulfurization (FGD) slurry
Hastelloy G-30 is specifically designed for highly oxidizing and mixed acid corrosion environments and is recommended for the following applications:
Application Fields
-
Fertilizer Industry (Wet Phosphoric Acid): Evaporators, heat exchangers, reactor linings, and piping systems (the classic application area for G-30, capable of withstanding corrosive phosphoric acid containing fluorides and chlorides)
-
Chemical Processing: Equipment for handling sulfuric acid, nitric acid, phosphoric acid, and mixed acids (sulfuric-nitric, hydrochloric-sulfuric), pickling equipment, reactors, and tanks
-
Nuclear Industry: Nuclear fuel reprocessing, nuclear waste treatment, and storage 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⁻
-
Hydrometallurgy: Acid leaching equipment for extracting metals such as copper, cobalt, and zinc, electrolytic refining cells, and linings for acidic leaching reactors
-
Environmental Equipment: Acidic wastewater treatment and exhaust gas purification systems
-
Pharmaceutical and Pesticide Industries: Reactors and piping involved in complex chemical processes and strongly oxidizing media
-
Pulp and Paper Industry: Harsh corrosive environments in bleaching processes
-
Petrochemical Industry: Reactors and piping systems in the processing of sour crude oil
-
Gold Mining Extraction: Equipment for handling cyanide and acidic media
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Hastelloy G-30 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 |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 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-30?
Q: What heat treatment is required for Hastelloy G-30?
Q: What is the maximum service temperature?
Q: What is the difference between it and Hastelloy C-276 ?
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