sa240 / sa240m 304 uns s30400

Overview of SA 240/SA 240M 304 (UNS S30400)

SA 240/SA 240M 304 (UNS S30400) is an austenitic stainless steel specified under ASME SA 240/SA 240M and ASTM A240/A240M for plates, sheets, and strips used in pressure vessels and general applications. The "M" in SA 240M denotes metric units, aligning with international standards, but the material properties remain identical to SA 240 304. Known for its SA 240 GR 304 density of 8.00 g/cm³ and SA 240 304 non magnetic properties in the annealed state, it’s widely used in food processing, chemical equipment, and architectural applications. Gangsteel’s sa 240 gr 304 plates meet both ASME and ASTM requirements.

Chemical Composition of SA 240/SA 240M 304

The chemical composition of SA 240/SA 240M 304 (UNS S30400), as per ASME SA 240/SA 240M, ensures excellent corrosion resistance and formability:

• Chromium (Cr): Forms a passive oxide layer for corrosion resistance.
• Nickel (Ni): Enhances ductility and SA 240 304 non magnetic properties.
• Carbon (C): Limited to ≤0.08% for weldability, though SA 240/SA 240M 304L (≤0.03%) is preferred for critical welds. See sa 240 gr 304l.

For detailed specifications, refer to our SS 304 data sheet.

Mechanical Properties

The mechanical properties of SA 240/SA 240M 304 for annealed plates (8-75 mm thick) support its use in structural and forming applications:

Cold-working can increase tensile strength (up to 900 MPa) but reduces ductility. For high-temperature applications, explore sa 240 gr 304h.

Physical Properties

• Density: 8.00 g/cm³ (SA 240 GR 304 density), ideal for lightweight designs (e.g., a 1m x 1m x 3mm plate weighs ~24 kg).
• Melting Point: ~1400-1450°C, suitable for processing.
• Thermal Conductivity: 16.2 W/m·K, moderate for heat transfer.
• Coefficient of Thermal Expansion: 17.2 × 10⁻⁶/K, stable across temperatures.
• Electrical Resistivity: 0.72 × 10⁻⁶ Ω·m, good for non-conductive applications.

These properties make SA 240/SA 240M 304 suitable for plat SS 304 3mm and plate 2 mm SUS 304.

Corrosion Resistance and Weldability

SA 240/SA 240M 304 offers excellent corrosion resistance in:

• Atmospheric conditions, freshwater, and mild acids (food-grade applications).
• General environments, outperforming SS204 vs SS 304 due to higher nickel content.

It’s less resistant to chloride-induced pitting compared to SA 240/SA 240M 316L. Weldability is good with ER308 or ER308L fillers, but SA 240/SA 240M 304L is preferred for critical welds to avoid sensitization. For chloride-heavy environments, explore sa 240 gr 316l.

Applications of SA 240/SA 240M 304

SA 240/SA 240M 304 (UNS S30400) plates are used in:

• Food Processing: Tanks, conveyors, and equipment (hygienic, non-tarnishing).
• Chemical Industry: Vessels and SA 240 GR 304 pipe for mild corrosives.
• Architecture: Structural and decorative panels like plat stainless 304.
• Automotive: Components requiring corrosion resistance and formability.

For harsher conditions, consider sa 240 gr 317l or sa 240 gr 321 for high-temperature stability.

Pricing and Availability at Gangsteel

As of October 14, 2025, SA 240/SA 240M 304 plate prices for 2B finish (3-6mm thick) range from $1.55-$3.50/kg globally, influenced by nickel prices (~$15,325/t). Gangsteel offers competitive pricing starting at $1.60/kg FOB (MOQ 1 ton) for standard sizes (e.g., 4’x8’, 5’x10’) and custom cuts like plate 2 mm SUS 304, with finishes like 2B, No.1, and polished. Our SA 240 304 plate price is 5-10% below market averages, and dual-certified SA 240 TP 304/304L plates are available for flexibility.

Why Choose Gangsteel?

Gangsteel provides certified SA 240/SA 240M 304 (UNS S30400) plates with consistent properties and competitive SA 240 304 plate price. Our 600+ ton inventory supports global delivery for applications from plat stainless 304 to heavy plates. For quotes or to learn what is SA 304, visit our astm a 240 stainless plate page or email admin@gangsteel.com.