China Hastelloy G30 Bar Factory

Hastelloy G30 round bar is a chromium-nickel alloy designed for resistance to highly oxidizing corrosion environments. Its core strengths lie in its extremely high chromium content, along with molybdenum, copper, and tungsten.

G30 round bar offers excellent resistance to pitting, crevice, and intergranular corrosion, particularly in environments with highly oxidizing media such as hot concentrated nitric acid, mixed acids, and highly concentrated phosphoric acid, significantly outperforming C276.

As such, UNS N06030 round bar, primarily used as structural components and fasteners, must be manufactured in accordance with stringent standards such as ASTM B581 to ensure the reliability and long-term durability of the final product.

Hastelloy G30 Chemical Composition Chart

Hastelloy G30 Physical And Mechanical Properties

Physical Properties of Hastelloy G30

Mechanical Properties of Hastelloy G30

These values are typically minimum requirements or representative data for plate material in the solution-annealed condition (ASTM B582).

Hastelloy G30 Bars Performance Advantages

Corrosion Resistance:

Strong Acid Environments: In wet-process phosphoric acid, G30 is more corrosion-resistant than alloys G3 and 625. In mixed acids, its corrosion resistance far exceeds that of most nickel alloys.

High-Temperature Stability: It can operate for long periods at 1000-1100°C, exhibiting excellent oxidation resistance and is suitable for high-temperature oxidizing environments.

Stress Corrosion Resistance: It offers excellent resistance to chloride stress corrosion cracking, making it particularly suitable for offshore engineering and chlorine-containing equipment.

Excellent Mechanical Properties:

High Strength: Tensile strength reaches 760-870 MPa, yield strength 345-415 MPa, and elongation 40-45%, combining high rigidity with excellent deformation resistance.

High-Temperature Strength: Maintains stable mechanical properties even at high temperatures, surpassing ordinary stainless steel.

Excellent Machinability and Weldability:

Hot and Cold Working: Complex shapes can be formed through cold forming or hot working, with moderate work hardening.

Welding Process: Welding with ERNiCrMo-11 wire or ENiCrMo-11 electrodes is recommended. Submerged arc welding should be avoided to reduce heat input. Post-weld preheating is not required, but solution heat treatment is required to restore corrosion resistance.

Hastelloy G30 vs C276

Primary Corrosion Resistance

HASTELLOY G30 is used for superior resistance to highly oxidizing acids and complex mixed-acid environments, particularly those found in the fertilizer industry.

Its key strength lies in its ability to resist hot, concentrated wet-process phosphoric acid and mixtures containing nitric acid, which are intensely oxidizing due to contaminants like ferric ions.

Conversely, HASTELLOY C276 is optimized for exceptional resistance across a broader range of media, excelling in strong reducing environments while also providing robust oxidizing resistance.

Chemical Composition

HASTELLOY G30 is a high-chromium alloy with additional copper and tungsten. This high chromium content is what gives it its aggressive oxidizing resistance.

HASTELLOY C276, in contrast, has a lower chromium content but contains significantly higher levels of molybdenum and tungsten. The elevated molybdenum is the key element providing C276 its signature resistance to reducing acids and localized corrosion.

Performance in Phosphoric Acid

HASTELLOY G30 generally exhibits superior corrosion rates and is the preferred, and often mandatory, material for critical components in wet-process phosphoric acid production and concentration.

While C276 offers excellent general corrosion resistance, G30's specialized composition makes it better suited to withstand the specific, complex oxidizing nature of this fertilizer-grade acid at high temperatures.

Resistance to Reducing Acids

HASTELLOY C276 is generally considered the industry benchmark for resistance to reducing acids, largely due to its high molybdenum content.

In non-aerated or mildly reducing environments like pure, hot hydrochloric acid or certain concentrations of sulfuric acid, C276 typically outperforms G30.

Therefore, when the application primarily involves exposure to highly concentrated, oxygen-free reducing chemicals, the high molybdenum content of C276 gives it the decisive advantage.

Susceptibility to Localized Attack

Both alloys are highly resistant to localized corrosion, but their specific strengths differ.

C276 is renowned for its low susceptibility to pitting and crevice corrosion, often serving as the standard for comparison against chloride-induced attack across a wide array of environments.

G30 is also highly resistant, particularly in the oxidizing chloride environments found in contaminated phosphoric acid.

In summary, C276 is often chosen when the priority is maximum resistance to localized pitting in diverse chloride solutions, while G30 is chosen when the primary concern is the specific high oxidation potential encountered in complex industrial acids.

Why Choose Hastelloy G30 Bar Factory?

The key advantage of choosing a Chinese Hastelloy G30 bar manufacturer is its ability to provide products that meet international standards and offer cost-effectiveness.

Specifically, leading Chinese Hastelloy G30 bar manufacturers ensure strict compliance with international standards such as ASTM B581 and material test reports. They can meet the global fertilizer and chemical industry's G30 bar needs with more competitive pricing, greater production capacity, and faster batch delivery.