1. What is the difference between Inconel 625 and Inconel 718 round bars?
Answer:
Inconel 625 is strengthened mainly by solid-solution hardening with high nickel, chromium, and molybdenum content, offering excellent corrosion and oxidation resistance.
Inconel 718 is a precipitation-hardened alloy containing niobium and titanium, providing much higher tensile strength and hardness, especially at elevated temperatures.
2. What applications commonly use Inconel 625/718 round bars?
Answer:
These alloys are widely used in aerospace components, gas turbines, chemical processing, oil & gas equipment, marine engineering, and high-temperature fasteners due to their superior strength, corrosion resistance, and thermal stability.
3. What factors affect the price per kilogram of Inconel 625/718 round bars?
Answer:
Key price-impacting factors include:
Alloy grade (625 vs. 718)
Diameter and length of the bar
Surface condition (black, bright, peeled, centerless-ground)
Manufacturing process (hot-rolled vs. forged vs. annealed)
Nickel market price fluctuations
Order quantity and delivery terms
4. What are the typical mechanical properties of Inconel 625 and 718 round bars?
Answer:
Inconel 625: Tensile strength ≈ 827 MPa, Yield strength ≈ 414 MPa, Excellent ductility and corrosion resistance.
Inconel 718: Tensile strength ≈ 1,240 MPa, Yield strength ≈ 1,030 MPa (after heat treatment), High fatigue and creep resistance.
5. How can the quality of Inconel 625/718 round bars be ensured before purchase?
Answer:
Quality can be verified by requesting:
Mill test certificates (EN 10204 3.1/3.2)
Chemical composition reports
Mechanical property testing results
Ultrasonic or eddy-current testing
Heat treatment records
Surface and dimensional inspection reports
