When sourcing Inconel 625 sheets for high-temperature or corrosive environments, heat treatment condition is just as critical as chemical composition.For procurement managers, engineers, and project contractors, understanding how Inconel 625 sheets are heat treated-and why-directly affects corrosion resistance, mechanical stability, fabrication performance, and service life.
What is Inconel 625 plate?
Inconel 625 (UNS N06625 / EN 2.4856) is a nickel-chromium-molybdenum alloy whose strengthening mechanism is primarily solid-solution strengthening, rather than precipitation hardening. Through heat treatment focused on stress relief, homogenization of the microstructure, and improved corrosion resistance, the processing of Inconel 625 plate requires strict control to avoid deformation.
Why Heat Treatment Is Critical for Inconel 625 Sheets?
Unlike Inconel 625 bars or forgings, Inconel 625 sheets are more sensitive to factors such as residual rolling stress and warping deformation during processing. Proper heat treatment ensures: a uniform microstructure, optimal corrosion resistance, dimensional stability at high temperatures, and stable forming and welding properties.
Buyer's Note: Heat treatment conditions directly affect processing costs, scrap rates, and long-term reliability.
Standard Heat Treatment for Inconel 625 Sheets
Inconel 625 Sheets Solution Annealing (Most Common Condition)
| Heat Treatment Step | Typical Parameters |
|---|---|
| Heating Temperature | 980–1,100 °C (1,800–2,010 °F) |
| Holding Time | Sufficient for full solution |
| Cooling Method | Rapid cooling (water quench or air cool) |
| Result | Fully recrystallized austenitic structure |
Inconel 625 Sheets Stress Relief Heat Treatment
| Parameter | Typical Range |
|---|---|
| Temperature | 870–980 °C |
| Cooling | Air cooling |
| Effect | Reduces residual stress without loss of corrosion resistance |
Inconel 625 Annealed Sheet Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 760 MPa |
| Yield Strength (0.2%) | ≥ 345 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 220 HB |
| Density | 8.44 g/cm³ |
Standards for Inconel 625 Sheet Heat Treatment
Common standards referencing heat treatment include:
ASTM B443 / ASME SB443
ASTM B906
EN 10095 (reference use)
AMS 5599 / AMS 5879
What is the standard heat treatment process for Inconel 625 plates?
The standard heat treatment for Inconel 625 plates is Solution Annealing, typically heating to 1000-1150°C (1800-2100°F) for proper dissolution of strengthening phases, followed by rapid cooling (quenching in water or air) to achieve maximum ductility, corrosion resistance, and a homogeneous microstructure, but Stress Relieving (around 900°C) or specific annealing (around 700-900°C for precipitate hardening) can also be used to tailor properties for specific applications.
Does Inconel 625 plate require aging treatment?
No, standard Inconel 625 plate does not require aging treatment; its high strength comes from solid-solution strengthening by molybdenum (Mo) and niobium (Nb) in its nickel-chromium matrix, meaning solution annealing (to maximize ductility/corrosion resistance) or stress relieving is typically sufficient.
Can Inconel 625 plate undergo stress relief treatment?
Yes, Inconel 625 plates can be stress-relieved, which is a common practice to reduce internal stresses caused by forming/welding. This is typically done by heat treating at temperatures around 870–980°C (1600–1800°F) for at least one hour to improve dimensional stability.
Inconel 625 plate supplier
To better serve international buyers, GNEE offers flexible payment methods, including T/T (30% down payment, 70% before shipment), sight letter of credit (L/C), and DP/DA payment options for long-term partners; uses seaworthy wooden crates or pallets for packaging, providing moisture-proof, rust-proof, and edge protection measures, and clearly marking the heat number and dimensions on the plates; guarantees efficient delivery, with in-stock Alloy 625 plates shipped within 7-10 days and custom sizes within 15-25 days; provides complete factory test certificates (MTC 3.1), and boasts extensive global export experience covering the Middle East, Europe, the United States, and Southeast Asia.
