A240 Stainless Steel Sheet Specification
A240 Stainless Steel Sheet Specification.pdf
ASTM A240 is a widely used specification for stainless steel plates, sheets, and strips in industries requiring corrosion resistance and mechanical strength. Understanding its pressure ratings, thickness tolerances, density, and temperature range is crucial for engineers, fabricators, and buyers.
This article answers common questions about ASTM A240 to help you select and apply this material correctly.
What is the Pressure Rating of ASTM A240?
ASTM A240 itself does not specify a direct pressure rating because it covers flat-rolled stainless steel products rather than finished pressure vessels or piping components. However, the pressure rating depends on the stainless steel grade, thickness, and application standards such as ASME Boiler.
| Grade | Typical Thickness (inch) | Approximate Pressure Rating (psi) |
|---|---|---|
| 304 / 304L | 0.125 (3.2 mm) | Up to 3,000 psi (20.7 MPa) |
| 316 / 316L | 0.125 (3.2 mm) | Up to 3,000 psi (20.7 MPa) |
| 321 | 0.250 (6.35 mm) | Up to 2,500 psi (17.2 MPa) |
| 310S | 0.250 (6.35 mm) | Up to 2,000 psi (13.8 MPa) |
What is the Thickness Tolerance of ASTM A240 and ASTM A480?
For stainless steel plates and sheets under ASTM A240/A480, thickness tolerance typically ranges from ±0.01 inch (±0.25 mm) for thinner gauges to ±0.05 inch (±1.27 mm) for thicker plates.
| Specification | Thickness Range (inches) | Typical Thickness Tolerance (inches) | Notes |
|---|---|---|---|
| ASTM A240 / A480 | Up to 0.187 (Up to 4.75 mm) | ±0.010 (±0.25 mm) | Applies to thinner plates and sheets |
| ASTM A240 / A480 | 0.188 to 0.500 (4.76–12.7 mm) | ±0.015 (±0.38 mm) | Common tolerance for medium thickness |
| ASTM A240 / A480 | Over 0.500 (>12.7 mm) | ±0.030 (±0.76 mm) | Applies to thicker plates |
What is the Density of ASTM A240 Material?
The density of common stainless steel grades covered by ASTM A240, such as 304 and 316, is approximately:7.9 g/cm³ (7900 kg/m³)
Knowing the density helps in weight calculations for structural design and shipping logistics.
What is the Temperature Range of ASTM A240 Stainless Steel?
ASTM A240 stainless steel grades exhibit excellent performance over a wide temperature range:
Operating temperatures: from -196°C (-320°F) up to 870°C (1600°F) for grades like 304 and 316.
| Grade | Minimum Temperature | Maximum Temperature |
|---|---|---|
| 304 / 304L | -196°C (-320°F) | ~870°C (1600°F) |
| 316 / 316L | -196°C (-320°F) | ~870°C (1600°F) |
| 321 | -196°C (-320°F) | ~900°C (1650°F) |
| 310S | -196°C (-320°F) | ~1150°C (2100°F) |
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