astm a240 304 stainless steel

Overview of ASTM A240 304 Stainless Steel

ASTM A240 304 is an austenitic stainless steel specified under ASTM A240/A240M for chromium and chromium-nickel stainless steel plates, sheets, and strips used in pressure vessels and general applications. Equivalent to ASME SA 240 GR 304, UNS S30400, and 1.4301, it’s valued for its SA 240 GR 304 density of 8.00 g/cm³ and SA 240 304 non magnetic properties in the annealed state.

ASTM A240 304 is ideal for applications like plat stainless 304, SA 240 GR 304 pipe, and structural components. Gangsteel’s sa 240 gr 304 plates ensure compliance and quality.

Chemical Composition

The chemical composition of ASTM A240 304 ensures excellent corrosion resistance and formability:

• Chromium: Forms a passive oxide layer for corrosion resistance.
• Nickel: Enhances ductility and SA 240 304 non magnetic properties.
• Carbon: Limited to ≤0.08% for weldability, though ASTM A240 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 ASTM A240 304 for annealed plates (8-75 mm thick) support 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 support applications like plat SS 304 3mm and plate 2 mm SUS 304.

Corrosion Resistance and Weldability

ASTM A240 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 ASTM A240 316L. Weldability is good with ER308 or ER308L fillers, but ASTM A240 304L is preferred for critical welds to avoid sensitization. For chloride-heavy environments, explore sa 240 gr 316l.

Applications of ASTM A240 304

ASTM A240 304 is 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, ASTM A240 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 SS 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 ASTM A240 304 (SA 240 GR 304) 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.