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High Temperature Valve Materials Application
Created on 05.04
550°C – 650°C: Chromium-Molybdenum Alloy Steel
In this temperature range, the strength of ordinary carbon steel decreases significantly and graphitization may occur. Therefore, low-alloy steels containing elements such as chromium (Cr) and molybdenum (Mo) are required. These materials offer excellent high-temperature strength and creep resistance.
Typical materials:
- WC9 (2¼ Cr – 1 Mo):
- C12A (9 Cr – 1 Mo – V):
650°C – 816°C: Heat-Resistant Stainless Steel
When temperatures exceed 650°C, chromium-molybdenum steels no longer perform adequately. Austenitic heat-resistant stainless steels should be selected instead. These materials maintain good microstructural stability and oxidation resistance at high temperatures.
Typical materials:
- CF8M / 316 Stainless Steel:
- SUS310S (310S Stainless Steel):
816°C – 1100°C and Above: Nickel-Based Superalloys
For extreme high-temperature conditions exceeding 816°C, ordinary stainless steels lack sufficient strength and oxidation resistance. Nickel-based superalloys are required. These alloys offer exceptional high-temperature strength, excellent oxidation resistance, and hot corrosion resistance.
Typical materials:
- Inconel (e.g., Inconel 625):
- HK-30 / HK-40:
- H06601:
Key Structural Design Considerations for Ultra-High-Temperature Valves
Under ultra-high-temperature conditions, the material alone is insufficient. The structural design of the valve is equally critical:
- Heat Dissipation and Cooling:
- Prevention of Thermal Expansion Seizure:
- Hard Seal Design:
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