904L is a super-austenitic with roughly 25% nickel, 20% chromium, 4.5% molybdenum and a deliberate copper addition that specifically targets resistance to sulphuric and phosphoric acid. The high nickel content also raises resistance to chloride stress corrosion cracking well above the 300 series. It is expensive, and in many chloride duties a duplex grade delivers comparable resistance at lower cost and higher strength.
Pitting resistance equivalent. Higher resists chlorides better.
Indexed to 304. Indicative, for specification triage.
Rajgranth Metal & Alloys manufactures, stocks, supplies and exports Stainless Steel 904L in 8 product forms from Mumbai. High nickel, high molybdenum, with copper. Built for sulphuric acid service. 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.
904L is a super-austenitic with roughly 25% nickel, 20% chromium, 4.5% molybdenum and a deliberate copper addition that specifically targets resistance to sulphuric and phosphoric acid. The high nickel content also raises resistance to chloride stress corrosion cracking well above the 300 series. It is expensive, and in many chloride duties a duplex grade delivers comparable resistance at lower cost and higher strength.
Stainless Steel 904L is also designated UNS N08904, EN 1.4539, AISI 904L, JIS SUS890L, GB S39042 and Werkstoff X1NiCrMoCu25-20-5.
Strengths: Resists dilute sulphuric and phosphoric acid where 316L fails, High resistance to chloride stress corrosion cracking, Fully austenitic, so tough down to cryogenic temperatures and Excellent crevice corrosion resistance. Limitations: Four to five times the cost of 304, Low mechanical strength relative to duplex at similar PREN, Difficult to machine — requires rigid setup and sharp tooling and Long lead times outside held stock.
sulphuric acid plant and storage, phosphoric acid and fertiliser production, flue gas scrubbing systems, seawater and brine handling and pickling plant equipment. Typical industries: chemical, fertiliser, petrochemical, marine & shipbuilding 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.
Each combination is a page with its own dimensional range, finishes and standards.
Send the form, size, quantity and standard. We will confirm what is in stock and quote.
