18Cr-4Ni duplex stainless steel is a two-phase ferritic-austenitic stainless steel combining moderate chromium content with balanced nickel levels to achieve good corrosion resistance and workability. This variant is used in moderate-corrosion environments where both strength and ductility matter, such as structural fasteners, process equipment, and general industrial piping; it offers better toughness than ferritic grades while remaining more cost-effective than higher-alloyed duplex or super-duplex stainless steels, making it a practical choice when 300-series austenitic grades would be over-specified.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 18.00 | - | — | ||
Ultimate Tensile Strength(σUTS) | 190.8 | ksi | — | ||
Yield Strength (0.2% offset)(σy) | 149.2 | ksi | — |