The hardness of GH3030 alloy is typically measured using the Brinell Hardness (HB) scale. Under standard annealed conditions, its Brinell Hardness generally ranges from ≤190 HB. This relatively moderate hardness is consistent with the alloy's design focus on good ductility and processability, making it suitable for forming operations such as bending, stamping, and welding while maintaining basic structural strength.
GH3030 is a nickel-based austenitic heat-resistant alloy, and its chemical composition is strictly controlled to ensure heat resistance, corrosion resistance, and mechanical stability. The typical composition (by weight percentage, wt%) is as follows:
The tensile strength of GH3030 alloy varies with temperature, as high temperatures typically reduce the mechanical strength of heat-resistant alloys. Below are the typical tensile strength values (tested on annealed specimens, in accordance with standards such as GB/T 228.1 or ASTM E8):
Room temperature (20°C): Minimum tensile strength (Rm) is ≥539 MPa (megapascals); typical values range from 540 - 650 MPa.
High temperature (e.g., 800°C): Tensile strength decreases to approximately 196 - 245 MPa, which still meets the strength requirements for high-temperature service scenarios (e.g., heat exchanger components).
Yield strength (typically 0.2% offset yield strength, Rp0.2) is a key indicator of the alloy's resistance to plastic deformation. Similar to tensile strength, it is temperature-dependent:
Room temperature (20°C): Minimum 0.2% offset yield strength is ≥206 MPa; typical values are between 210 - 300 MPa.
High temperature (e.g., 800°C): 0.2% offset yield strength drops to around 118 - 157 MPa, ensuring the alloy maintains structural integrity without excessive deformation under high-temperature loads.
