what is sa 240 stainless steel

What is SA 240 Stainless Steel?

SA 240 stainless steel is a standard specification published by ASME (American Society of Mechanical Engineers) that defines the requirements for chromium and chromium-nickel stainless steel plates, sheets, and strips used in pressure vessels, boilers, and general corrosive service. It aligns with ASTM A240 and covers a range of austenitic, ferritic, and martensitic stainless steel grades, including popular ones like SA 240 GR 304 and SA 240 GR 316L. These materials are valued for their durability, corrosion resistance, and versatility in applications like plat stainless 304, SA 240 GR 304 pipe, and structural components.

Common Grades of SA 240 Stainless Steel

SA 240 includes a variety of stainless steel grades, categorized by their microstructure (austenitic, ferritic, martensitic, or duplex). Below is a table of selected grades, their UNS numbers, and key characteristics:

For a full list, explore our sa 240 gr 304, sa 240 gr 316l, sa 240 gr 317l, and other grades.

Properties of SA 240 GR 304 (Representative Grade)

As a widely used grade, SA 240 GR 304 serves as a benchmark for SA 240 stainless steel properties:

Chemical Composition

• Chromium: Ensures corrosion resistance via a passive oxide layer.
• Nickel: Enhances ductility and SS 304 non magnetic properties.
• Carbon: Limited for weldability, though SA 240 GR 304L is preferred for critical welds.

Mechanical Properties

Physical Properties

• Density: 7.93 g/cm³ (SA 240 GR 304 density).
• Melting Point: ~1400-1450°C.
• Thermal Conductivity: 16.2 W/m·K.
• Coefficient of Thermal Expansion: 17.2 × 10⁻⁶/K.
• Electrical Resistivity: 0.72 × 10⁻⁶ Ω·m.

For detailed specs, see our SS 304 data sheet.

Corrosion Resistance and Weldability

SA 240 GR 304 offers excellent corrosion resistance in:

• Atmospheric conditions, freshwater, and mild acids (food-grade).
• General environments, outperforming SS204 vs SS 304.

It’s less resistant to chloride pitting compared to SA 240 GR 316L. Weldability is good with ER308 fillers, but SA 240 GR 304L is preferred for welded applications. Explore sa 240 gr 304l and sa 240 gr 316l.

Applications of SA 240 Stainless Steel

SA 240 grades like 304, 316L, and 321 are used in:

• Food Processing: Tanks and plat stainless 304 for hygiene.
• Chemical Industry: Vessels and SA 240 GR 304 pipe.
• Architecture: Structural panels like plate 2 mm SUS 304.
• Oil and Gas: Duplex grades like SA 240 Type 2205 for high strength.

For high-temperature needs, see sa 240 gr 304h or sa 240 gr 321.

Why Choose Gangsteel?

Gangsteel offers certified SA 240 stainless steel plates at competitive SS 304 plate price, including custom sizes like plat SS 304 3mm. Our 600+ ton inventory supports global delivery. For quotes or to learn what is SA 304, visit our astm a 240 stainless plate page or email admin@gangsteel.com.