Stockist & supplier ASTM A240 · ASME SA-240 · ASTM A480
SS 304 / 304L Plates — ASTM A240
SS 304 and 304L plate is general-purpose austenitic stainless steel plate. Teshi Group stocks and supplies ASTM A240 / ASME SA-240 304 (UNS S30400) and 304L (UNS S30403) plate, sheet and coil, including dual-certified 304/304L. Quotes are sent in 24–48 hours.
Also called: SS 304 plate, 304L plate, stainless 304 sheet, 1.4301 plate, UNS S30400 plate
What is an SS 304 / 304L Plate?
Type 304 is the basic 18Cr-8Ni austenitic stainless steel, with good corrosion resistance in atmospheric, fresh-water and many chemical environments, and good formability and weldability. 304L has carbon limited to 0.030% to reduce chromium-carbide precipitation in weld heat-affected zones, so it is preferred for welded equipment that cannot be solution annealed after welding. Plate meeting both sets of limits is often dual-certified as 304/304L. It is used for tanks, vessels, process equipment, food and dairy plant, and architectural work.
Key features
- Stockist and supplier — sourced from stainless mills; Teshi does not manufacture plate
- ASTM A240 / ASME SA-240 Type 304 and 304L
- Dual-certified 304/304L available
- Plate, sheet and coil; No.1, 2B, BA and No. 4 finishes
- 304H for high-temperature service against order
- Can be ordered together with flanges, fittings and fabrications manufactured by Teshi
Specification
| Supply | Stockist & supplier — Teshi Group, India |
|---|---|
| Standard | ASTM A240 / ASME SA-240; general requirements ASTM A480 |
| Grades | 304 (S30400), 304L (S30403); 304H (S30409) against order |
| 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
- Storage tanks and process vessels
- Food, dairy and beverage equipment
- Pharmaceutical plant
- Heat exchangers and ducting
- Architectural and general fabrication
Chemical composition — 304 / 304L (ASTM A240)
| UNS | C | Mn | P | S | Si | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| S30400 (304) | 0.07 | 2.00 | 0.045 | 0.030 | 0.75 | 17.5–19.5 | 8.0–10.5 | 0.10 |
| S30403 (304L) | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 17.5–19.5 | 8.0–12.0 | 0.10 |
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 |
|---|---|---|---|---|
| S30400 | 515 | 205 | 40 | 201 HBW / 92 HRB |
| S30403 | 485 | 170 | 40 | 201 HBW / 92 HRB |
Per ASTM A240 Table 2.
Technical data sheets
Dimensions & weights
FAQ
SS 304 / 304L Plate: common questions
What is the difference between 304 and 304L?
304L has a maximum carbon of 0.030% against 0.07% for 304, which lowers the risk of intergranular corrosion after welding. 304L has slightly lower minimum strength (485 MPa tensile, 170 MPa yield).
What is dual-certified 304/304L plate?
Plate whose chemistry meets 304L and whose strength meets 304, certified to both grades. It can be used where either grade is specified. This simplifies stock and procurement.
Is 304 suitable for seawater?
No. 304 has no molybdenum and is prone to pitting in chlorides. 316L or higher-alloyed grades such as duplex 2205 are used for chloride service.
Does Teshi manufacture stainless plate?
No. Teshi Group is a stockist and supplier of SS 304 / 304L 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.
Quick RFQ
Quote for SS 304 / 304L Plate in 24–48 hours
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