Stockist & supplier ASTM A240 · ASME SA-240 · ASTM A480 · ASTM B625
904L Plates — ASTM A240 UNS N08904
904L plate is a high-alloy super-austenitic stainless steel plate with nickel, molybdenum and copper for acid and chloride service. Teshi Group stocks and supplies ASTM A240 / ASME SA-240 904L (UNS N08904) plate and sheet. Quotes are sent in 24–48 hours.
Also called: 904L plate, UNS N08904 plate, 1.4539 plate, super austenitic plate, SS 904L sheet
What is a 904L Plate?
904L (UNS N08904) is a low-carbon austenitic stainless steel with 23–28% nickel, 19–23% chromium, 4–5% molybdenum and 1–2% copper. The copper addition gives good resistance to sulphuric acid, and the molybdenum and chromium give resistance to pitting and crevice corrosion in chlorides. It is used in sulphuric and phosphoric acid plants, flue gas cleaning, seawater cooling, pulp and paper, and pharmaceutical equipment. Plate is also covered by ASTM B625; A240 is the common purchase specification.
Key features
- Stockist and supplier — sourced from stainless mills; Teshi does not manufacture plate
- ASTM A240 / ASME SA-240 UNS N08904
- Copper-bearing for sulphuric acid resistance
- Low carbon (0.020% max) for welded construction
- Plate and sheet; other sizes supplied against order
- 904L flanges and fittings manufactured by Teshi
Specification
| Supply | Stockist & supplier — Teshi Group, India |
|---|---|
| Standard | ASTM A240 / ASME SA-240; general requirements ASTM A480 |
| Grades | 904L (N08904) |
| Product forms | Plate (3/16 in / 4.76 mm and thicker per ASTM A480), sheet and coil; other sizes supplied against order |
| Condition | Solution annealed and descaled (pickled) |
| Finish | No.1 (hot rolled, annealed, pickled) for plate; 2B, BA or No. 4 for sheet |
| Other plate grades stocked | Carbon / boiler: IS 2062 E250–E450, ASTM A36, A516 Gr 60 / 70, A537; Cr-Mo: ASTM A387 Gr 11, 12, 22, 91; stainless: ASTM A240 304 / 304L / 304H, 309S, 310S, 316 / 316L / 316H / 316Ti, 317L, 321 / 321H, 347 / 347H, 410, 430, 904L, 254 SMO; duplex S31803 / S32205; super duplex S32750 / S32760; nickel: Monel 400 (B127), Inconel 600 (B168), Inconel 625 (B443), Incoloy 800 / 800H / 800HT (B409), Incoloy 825 (B424), Hastelloy C276 / C22 (B575), Hastelloy B2 / B3 (B333), Alloy 20 (B463), Nickel 200 / 201 (B162); titanium Gr 1, 2, 5, 7, 12 (B265); Cu-Ni 90/10, 70/30 (B171) |
| Testing | Chemical and tensile tests per A240; intergranular corrosion test (ASTM A262) when specified |
| Documents | Mill test certificate to EN 10204 3.1; EN 10204 3.2 / third-party inspection when the order specifies |
Applications
- Sulphuric and phosphoric acid plant
- Flue gas cleaning
- Seawater-cooled heat exchangers
- Pulp and paper bleach plant
- Pharmaceutical and fine chemical equipment
Chemical composition — 904L (ASTM A240)
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| N08904 (904L) | 0.020 | 2.00 | 0.045 | 0.035 | 1.00 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | 0.10 | 1.0–2.0 |
Maximum unless a range is shown; % by weight. Per ASTM A240 Table 1.
Mechanical properties
| UNS | Tensile, min (MPa) | Yield 0.2%, min (MPa) | Elongation in 50 mm, min (%) | Hardness, max |
|---|---|---|---|---|
| N08904 | 490 | 220 | 35 | 90 HRB |
Per ASTM A240 Table 2.
Technical data sheets
Dimensions & weights
Material grades
All gradesFAQ
904L Plate: common questions
Is 904L stainless steel or a nickel alloy?
It is classed as a super-austenitic stainless steel (UNS N08904) and is covered by ASTM A240. Its high nickel content gives it a UNS 'N' number.
Why is copper added to 904L?
Copper improves resistance to sulphuric acid, a common service for 904L. It also helps in phosphoric acid and some other reducing acids, while molybdenum and chromium handle chloride pitting.
What is the difference between 904L and 316L?
904L has much higher nickel (23–28%) and molybdenum (4–5%) plus copper, giving far better resistance to acids and chloride pitting. It costs more. 904L is used where 316L corrodes too fast.
Does Teshi manufacture 904L plate?
No. Teshi Group is a stockist and supplier of 904L Plate, sourced from established mills and supplied with the original mill test certificate. Teshi is an OEM manufacturer of flanges, fittings, fasteners, valves and custom fabrications, which can be ordered with it.
Need a size or grade not listed here?
We source against your specification from approved mills, with mill test certificates and inspection before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
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Quote for 904L Plate in 24–48 hours
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