What is the coefficient of thermal expansion of 304 steel?
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If you are looking for high-performance materials for piping, tanks, or structural components, knowing the coefficient of thermal expansion (CTE) of 304 stainless steel is essential. 304 stainless steel, also known as EN 1.4301 or AISI 304, is one of the most widely used austenitic stainless steels globally. Its combination of excellent corrosion resistance, mechanical strength, and thermal stability makes it ideal for industries ranging from chemical processing to food and beverage, marine, and construction.
Why is the thermal expansion coefficient important for procurement?
The thermal expansion coefficient (CTE) is important for procurement because it ensures that materials will perform reliably under expected temperature changes. Procurement teams must source materials with the correct CTE to prevent structural failures, warping, or breakage in finished products, such as ensuring that dissimilar materials used together will not stress each other as they expand and contract at different rates.
What is the Coefficient of Thermal Expansion of 304 Stainless Steel?
The coefficient of thermal expansion (CTE) describes how much a material expands or contracts with temperature changes. For 304 stainless steel, the typical values are:
| Temperature Range | Coefficient of Thermal Expansion (α × 10⁻⁶ /°C) |
|---|---|
| 20–100 °C | 17.3 |
| 20–200 °C | 17.2 |
| 20–300 °C | 17.0 |
| 20–400 °C | 16.9 |
| 20–500 °C | 16.7 |
Accurate knowledge of CTE is critical for designing piping systems, heat exchangers, pressure vessels, and structural components to avoid thermal stress, warping, or joint failure.
What is the difference in the coefficients of thermal expansion between 304 and 316 stainless steel?
316 stainless steel has a slightly lower coefficient of thermal expansion (approximately 16.5–17 × 10⁻⁶ /°C), meaning that for the same temperature change, 316 has a slightly lower coefficient of thermal expansion than 304. 304 has a coefficient of thermal expansion of approximately 17.2 × 10⁻⁶ / K at room temperature, while 316 has approximately 16.0 × 10⁻⁶ / K, although both coefficients increase with increasing temperature.
Product Data Sheet for 304 Stainless Steel
| Property | Value (Typical) |
|---|---|
| Material Grade | 304 / 1.4301 / AISI 304 |
| Forms Available | Sheets, plates, pipes, tubes, rods |
| Thickness / Diameter | 0.3–200 mm (sheets/plates), 6–200 mm (bars/pipes) |
| Tensile Strength | 520–750 MPa |
| Yield Strength | 205–310 MPa |
| Elongation at Break | 40–60% |
| Hardness (HRB) | 70–95 |
| Density | 8.0 g/cm³ |
| Melting Point | 1,400–1,450 °C |
| Corrosion Resistance | Excellent in oxidizing environments, seawater, mild acids |
Can 304 stainless steel be used in high-temperature applications?
Yes, 304 stainless steel can be used in high-temperature applications, but its application range is limited, especially when used continuously within the range of 425–860°C (797–1580°F), as high temperatures reduce its corrosion resistance. To maintain its oxidation resistance, it is best suited for intermittent exposure up to 870°C (1600°F) or continuous exposure up to 925°C (1700°F), but higher temperatures will lead to a decrease in strength.
GNEE supplies 304/1.4301 stainless steel sheets, coils, plates, tubes, pipes, and custom-processed components with controlled dimensional tolerances suitable for thermal-sensitive applications. We ensure ISO/SGS/BV certified quality, moisture-proof packaging, fast delivery, and technical support on expansion allowance calculations-helping engineers and buyers reduce risks and improve project performance.
