GH3030 is a nickel-based superalloy primarily designed for high-temperature service environments. It falls under the category of heat-resistant superalloys and is widely specified in industries such as aerospace, aviation, power generation, and petrochemical engineering.
This material grade is known for its excellent oxidation resistance, thermal stability, and moderate strength at elevated temperatures (typically up to 1000°C/1832°F). It is particularly suitable for manufacturing components that require long-term exposure to high-temperature gases or corrosive media, such as furnace parts, combustion chambers, turbine engine components, and heat exchanger tubes. GH3030 is often referenced in international material standards and is comparable to grades like Inconel® 600 in terms of composition and performance.
The chemical composition of GH3030 is strictly controlled to ensure its high-temperature properties. Below is the typical composition (by weight percentage, wt%) as per industry standards (e.g., GB/T 14992, ASTM B168):
Nickel serves as the base element, providing the alloy with its fundamental thermal stability; chromium enhances oxidation and corrosion resistance by forming a protective oxide layer on the surface; and controlled levels of trace elements (e.g., C, Mn, Si) optimize processability and mechanical properties.
The hardness of GH3030 varies slightly depending on its heat treatment state (e.g., annealed, cold-worked) and testing standard. Below are the typical hardness values for common conditions:
Annealed State: This is the most common condition for GH3030, as annealing relieves internal stresses and optimizes high-temperature ductility.
Brinell Hardness (HB): Approximately ≤ 190 HB
Rockwell Hardness (HRB): Approximately ≤ 88 HRB
Vickers Hardness (HV): Approximately ≤ 200 HV
Cold-Worked State: If GH3030 undergoes cold working (e.g., rolling, drawing) to improve strength, its hardness will increase. For example, after moderate cold working, the Brinell Hardness may rise to 220 - 250 HB, but this state is less common for high-temperature applications (since cold work can reduce thermal stability).
Hardness testing for GH3030 typically follows standards like ASTM E10 (Brinell), ASTM E18 (Rockwell), or ASTM E92 (Vickers) to ensure accuracy and consistency.
