Temperature Limits of Metals: A Guide Based on ASME Standards
by scot ranney
When selecting a valve, it’s important to understand how temperature affects material strength. Metals weaken at high temperatures and can become brittle at low temperatures. The American Society of Mechanical Engineers (ASME) provides guidelines on the temperature and pressure limits of different valve materials in ASME B16.34.
In this post, we’ll break down the temperature capabilities of common valve materials, including stainless steel, carbon steel, and low-temperature carbon steel.
Why Temperature Matters in Valve Selection
Each valve material has:
- A minimum allowable temperature – going below this can make the material brittle and prone to cracking.
- A maximum allowable temperature – exceeding this can lead to material weakening, deformation, or failure.
Selecting the right material ensures long valve life, reliable operation, and safety.
Temperature Performance of Common Valve Materials
| Valve Material | Material Code | Min Temperature (°C/°F) | Max Temperature (°C/°F) | Best Use Case |
|---|---|---|---|---|
| Stainless Steel | ASTM A351 CF8M (316 SS) | -196°C (-320°F) | 538°C (1000°F) | Corrosive & extreme conditions |
| Stainless Steel | ASTM A351 CF8 (304 SS) | -196°C (-320°F) | 538°C (1000°F) | General corrosion resistance |
| Carbon Steel | ASTM A216 WCB | -29°C (-20°F) | 425°C (800°F) | General applications |
| Carbon Steel | ASTM A216 WCC | -29°C (-20°F) | 425°C (800°F) | Higher strength applications |
| Low-Temp Carbon Steel | ASTM A352 LCC | -46°C (-50°F) | 345°C (650°F) | Cryogenic & low-temp services |
| Alloy Steel | ASTM A217 WC6 | -29°C (-20°F) | 593°C (1100°F) | High-temperature, high-pressure |
Temperature Ranges of Valve Materials
This graph provides a visual comparison of minimum and maximum temperature limits for each material.
Choosing the Right Valve Material for Temperature Extremes
For High-Temperature Applications (Above 400°C/750°F)
- Best choices: 304 SS, 316 SS, WC6
- Why? These materials maintain strength at high temperatures.
- Common Uses: Steam systems, power plants, and chemical processing.
For Low-Temperature & Cryogenic Applications (Below -30°C/-20°F)
- Best choices: 304 SS, 316 SS, LCC
- Why? 304 and 316 Stainless Steel maintain ductility at cryogenic temperatures, and LCC is designed for low-temperature toughness.
- Common Uses: LNG applications, refrigeration, and cryogenic storage.
Final Thoughts
Choosing the right valve material for temperature extremes is crucial for performance and safety. If you're unsure, consult ASME standards and engineering experts before making a decision.
Need help selecting the best valve material for your application? Contact us today for expert guidance!
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