Aurico Alloys LLP supplies special stainless steel from Mumbai in sheet, plate, round bar, foil and powder. Held in stock or arranged with the manufacturer, depending on grade and quantity.
These are the grades that begin where 304 and 316 stop. Every one of them buys its extra resistance the same way — more nickel, more molybdenum, usually more chromium and nitrogen — and the pitting resistance equivalent number is the shorthand for how far that goes. 316 sits around 24. The 6% molybdenum grades here sit above 40.
Two grades in the list are not about chlorides at all. Alloy 20 was designed for sulphuric acid, where ordinary stainless is attacked. AM 350 and 17-4 PH are precipitation-hardening grades, chosen for strength rather than for the environment.
Special Stainless Steel Plates
Special Stainless Steel Round Bars
Special Stainless Steel Sheets
Grades Supplied
| Grade | UNS | Type | Chosen for |
|---|---|---|---|
| 904L | N08904 | Super austenitic | Sulphuric acid and general chemical service |
| 254 SMO | S31254 | 6% molybdenum | Seawater and high chloride, PREN above 40 |
| AL-6XN | N08367 | 6% molybdenum | Seawater cooling and desalination |
| Alloy 20 | N08020 | Acid resisting | Sulphuric acid, the grade it was designed around |
| Alloy 28 | N08028 | Super austenitic | Phosphoric and sulphuric acid service |
| Alloy 31 | N08031 | Super austenitic | Severe acid service, higher alloyed again |
| Alloy 926 | N08926 | 6% molybdenum | Seawater and flue gas desulphurisation |
| Sanicro 35 | N08935 | Nitrogen-alloyed austenitic | Seawater and sour service between 6-moly stainless and nickel alloy |
| AM 350 | S35000 | Precipitation hardening | Strength with moderate corrosion resistance |
Designations are as stated on each grade page. Confirm the specification against the mill certificate for the batch supplied.
Where These Alloys Are Used
- Desalination — high-pressure piping, vessels and heat exchangers
- Chemical processing — acid service, in alloy 20, 28 and 31
- Pollution control — flue gas desulphurisation ducting and absorbers
- Pulp and paper — bleach plant washers and piping
- Marine — seawater cooling and ballast systems
- Additive manufacturing — gas atomised 316L and 17-4 PH powder
Certification and Cutting
Material is supplied against EN 10204 3.1 mill test certificates, with chemical composition and mechanical properties for the batch. Cutting to size is done in house.
Ask for a Quotation
Tell us the grade, the form, the size and the quantity, and we will confirm availability, lead time and price. Contact us for stock availability, pricing and material test certificates.