This range covers two premium stainless grades serving opposite demands. 17-4PH (SAE 630 / UNS S17400) is a martensitic precipitation-hardening steel combining corrosion resistance with tensile strength up to ~1310 MPa in the H900 condition — the industry standard for pump shafts, valve internals, gears and aerospace fittings.

We supply it in solution-annealed Condition A for machining, or pre-aged to H900/H1025/H1150. SS 904L (UNS N08904) is a super-austenitic grade whose 4–5% molybdenum and copper addition give outstanding resistance to sulphuric and phosphoric acids at all concentrations — the bridge between 316L and full nickel alloys, widely specified in fertilizer, acid plant and seawater service.

DML stocks both grades in Mumbai in bars, plates, sheets and pipes.