The Ultimate Buyer’s Guide to Inconel 625: Properties, Grades, and Selection Criteria
Inconel 625 is a nickel-chromium-molybdenum superalloy that maintains mechanical integrity from cryogenic temperatures up to 1,800°F (982°C). However, purchasing this alloy is not simple. Due to its high cost (5–10x more than 316 stainless steel), buying the wrong specification can lead to catastrophic failure. This guide provides a fast, technical framework for engineers and procurement specialists, with best practices from ZYTC Alloy Supplier . 1. Core Chemistry – What to Verify Confirm the Mill Test Certificate (MTC) meets ASTM B443 (sheet/plate) or ASTM B444 (pipe/tube): Element % Range Why It Matters Nickel (Ni) 58.0–70.0 Base corrosion resistance Chromium (Cr) 20.0–23.0 Oxidation & scaling protection Molybdenum (Mo) 8.0–10.0 Pitting resistance (seawater) Niobium (Nb) 3.15–4.15 Prevents welding sensitization Red Flag: Nb below 3.0% = possible counterfeit (e.g., Alloy 625L). Reject it. ZYTC Alloy Supplier provides PMI-verified MTCs with every shipment, ensuring Nb stays with...