A duplex microstructure delivers what austenitics cannot: high strength and high chloride resistance at the same time. 2205 (S31803/S32205) is the workhorse; the super duplex grades 2507 (S32750) and Zeron-type S32760 push PREN above 40 for seawater and sour service. The strength advantage often allows a thinner wall, which recovers much of the cost premium on a large project.
Pitting resistance equivalent. Higher resists chlorides better.
Indexed to 304. Indicative, for specification triage.
Rajgranth Metal & Alloys manufactures, stocks, supplies and exports Duplex and Super Duplex Stainless Steel valves (UNS S31803 / S32205 / S32550 / S32750 / S32760) from Mumbai. Roughly equal austenite and ferrite. Around twice the yield strength of 316L. Rajgranth Metal & Alloys has been trading since 1980, is self-funded and debt-free, and despatches most orders from its Mumbai stockyard within two days.
A duplex microstructure delivers what austenitics cannot: high strength and high chloride resistance at the same time. 2205 (S31803/S32205) is the workhorse; the super duplex grades 2507 (S32750) and Zeron-type S32760 push PREN above 40 for seawater and sour service. The strength advantage often allows a thinner wall, which recovers much of the cost premium on a large project.
Duplex and Super Duplex Stainless Steel is also designated UNS S31803 / S32205 / S32550 / S32750 / S32760, EN 1.4462 / 1.4507 / 1.4501, AISI F51 / F60 / F53 / F55, JIS SUS329J3L, GB S22053 and Werkstoff X2CrNiMoN22-5-3 / X2CrNiMoCuWN25-7-4. Quote the designation your specification uses and we will supply to it.
Yield strength roughly double that of 316L, allowing thinner sections, Excellent resistance to chloride stress corrosion cracking, Super duplex PREN above 40 for seawater service and Good resistance to erosion and cavitation. It is partially, with requires-procedure weldability and difficult machinability, and is used in continuous service in air up to about 300 °C.
Hard upper service limit near 300 degrees C — 475 degrees C embrittlement, Welding requires controlled heat input to maintain phase balance, Ferromagnetic, which rules it out where magnetic permeability matters and Machining is demanding and tool wear is high. We state these plainly so the grade is chosen for the right service.
Our published range covers size 1/4″, 24″, class 150 to 1500, type Ball to Needle and ends Flanged, Screwed, Socket weld, Butt weld. Standards include API 6D, ASME B16.34, BS 1873, BS 1868 and DIN 3202. Finishes and conditions include Investment cast, Forged and Polished.
offshore and subsea piping, seawater cooling and desalination, chemical tankers and cargo systems, sour gas service and pressure vessels where weight matters. Typical industries: oil & gas, marine & shipbuilding, chemical, petrochemical and power & energy. We supply across India and export to markets in the Middle East, Africa, Europe, Asia, North America and South America.
Material is supplied with documentation, tested in house across 18 listed testing facilities, and covered by our ISO 9001:2015 quality management system. Rajgranth Metal & Alloys has been trading since 1980, is self-funded and debt-free, and despatches most orders from its Mumbai stockyard within two days.
Send the size, quantity and standard. We will confirm availability against stock and come back with price.
