1.Minimum room‑temperature yield strength of Inconel 625
The minimum yield strength (0.2% offset) of Inconel 625 at room temperature is typically 550 MPa (80 ksi) for the annealed condition, as specified in standards such as ASTM B446/B446M (for bars, rods, and wire) and ASTM B443/B443M (for sheet and plate).
550 MPa is the commonly accepted minimum specification limit.
2.Reduction in tensile strength at high temperature (e.g., 600°C)
Inconel 625 retains excellent strength at elevated temperatures, but a noticeable reduction in tensile strength occurs compared to room temperature.
Room temperature: Tensile strength is typically 965–1170 MPa (minimum specified ~965 MPa).
600°C: Tensile strength decreases to approximately 725–860 MPa.
This represents a reduction of about 20–30% in tensile strength at 600°C relative to room temperature.
The exact amount of reduction depends on factors such as heat treatment, grain size, and thermomechanical history, but the 20–30% range is representative for standard annealed material.
3.Impact toughness (Charpy V‑notch impact value) of Inconel 625
Inconel 625 exhibits very high toughness, even at low temperatures. Typical Charpy V‑notch (CVN) impact values for annealed material are:
Room temperature: 150–270 J (110–200 ft‑lb)
−196°C (liquid nitrogen): 80–150 J (60–110 ft‑lb)
These values indicate excellent resistance to brittle fracture. Specifications often do not mandate a minimum impact energy for Inconel 625, but the above ranges are commonly reported in material data sheets and handbooks.
