SUS630 Stainless Steel: Precipitation-Hardening Grade Features

Key Features & Characteristics:

High Strength & Hardness: Develops very high tensile and yield strength through age hardening, exceeding many other stainless steels.

Good Corrosion Resistance: Offers corrosion resistance similar to Grade 304 stainless steel in many environments.

Martensitic Structure: A martensitic steel that strengthens via precipitation of copper-rich phases during aging.

Simple Heat Treatment: Can be machined in the relatively soft solution-annealed (A) condition, then hardened with a single low-temperature aging treatment (e.g., H900, H1075, H1150).

Minimal Distortion: The low-temperature aging process prevents significant warping, ideal for precise parts like shafts.

Composition: Contains Chromium (Cr), Nickel (Ni), Copper (Cu), and Niobium (Nb/Cb).

Common Applications:

Aerospace components

Shafts (boat shafts, pump shafts)

Fasteners

Valves and fittings

Heat Treatment (Aging) Conditions:

Different aging temperatures (e.g., H900, H1075, H1150) tailor the final properties, balancing strength, hardness, and ductility.