What is SA240 304 material plate?
Nov 11, 2025
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What is SA240 304 Stainless Steel Sheet?
When sourcing stainless steel sheet for pressure vessels, heat exchangers, or chemical storage tanks, one of the most common specifications buyers encounter is SA240 304. So, what does SA240 304 mean? How does it differ from ASTM A240 304?
In short, SA240 304 is a specification developed by the American Society of Mechanical Engineers (ASME) for pressure vessel grade stainless steel sheet, while ASTM A240 304 is a general standard for both thin and thick stainless steel sheets. Both refer to type 304 stainless steel, but SA240 ensures that its mechanical strength, heat treatment, and inspection requirements meet the requirements of pressure equipment.
ASME SA240 / ASTM A240 Sheet (Gnee Supply Range)
| Specification | Details |
|---|---|
| Standard | ASME SA240 / ASTM A240 |
| Grade | 304 / 304L |
| Thickness | 0.3 mm – 100 mm |
| Width | 1000 mm – 2500 mm |
| Length | 2000 mm – 12000 mm (custom sizes available) |
| Surface Finish | 2B, BA, No.1, No.4, 8K Mirror, Hairline |
| Heat Treatment | Solution annealed |
| Certificates | ISO 9001, ASME, SGS, BV, TUV |
| Origin | Gnee Steel, China |
ASME SA240 304 stainless steel cold rolled plate Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
ASME SA240 304 stainless steel plate Mechanical Properties
| Property | Value (Annealed) | Unit |
|---|---|---|
| Tensile Strength | ≥ 515 | MPa |
| Yield Strength (0.2% offset) | ≥ 205 | MPa |
| Elongation | ≥ 40 | % |
| Hardness (Brinell) | ≤ 201 | HB |
| Density | 8.0 | g/cm³ |
| Melting Range | 1400 – 1450 | °C |
Applications of SA240 304 Plate
| Industry | Applications |
|---|---|
| Pressure Vessels & Boilers | Reactor shells, pressure tanks |
| Chemical & Petrochemical | Heat exchanger plates, process piping |
| Food & Beverage | Storage tanks, dairy and brewing equipment |
| Pharmaceutical | Cleanroom and processing equipment |
| Marine & Offshore | Structural panels, covers, and deck plating |
| Construction | Decorative panels, facades, elevators |
What is the difference between 304 and 304L in SA240?
304L has lower carbon content (≤ 0.03%), making it better for welding and reducing carbide precipitation.
How to choose between SA240 304 and 316?
Choose 304 for general corrosion resistance and 316 when higher resistance to chlorides or acids is required.
Is SA240 304 the same as ASTM A240 304?
Yes, ASTM A240 304 and ASME SA240 304 are the same material, as the ASME standard is essentially the same as the ASTM standard but adopted for use in pressure vessel codes. Both specify the same type of 304 stainless steel, with the ASME version including additional testing and certification requirements for safety-critical applications in pressure vessels.
If you are looking for SA240 304 stainless steel plates in stock, Gnee offers a complete range of solutions with professional processing and export support.
Gnee has supplied stainless steel plates to over 80 countries, including the UAE, Singapore, Saudi Arabia, USA, Germany, and Vietnam, gaining excellent customer feedback for quality stability and price competitiveness.
✅ What We Offer:
Full range of ASME SA240 / ASTM A240 304 & 304L plates
Thickness: 0.3–100 mm | Width: up to 2500 mm | Length: up to 12 m
Surface Finishes: 2B, BA, No.1, No.4, HL, and Mirror Polish
Processing services: Cutting, bending, polishing, welding, edge trimming, and CNC drilling
Custom packaging: Wooden crates, steel pallets, and moisture-proof wrapping for export safety
Quality Assurance: ISO 9001, SGS, BV, and ASME certification
Delivery Time: 7–15 days for standard sizes, faster for urgent orders
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