High-Temperature Threaded Alloy Flanges For Power Plants
High-Temperature Threaded Alloy Flanges for Power Plants – SSM
SSM manufactures and supplies high-temperature threaded alloy flanges designed for power generation, petrochemical, and refinery applications. These flanges are made from high-strength alloy steel, ensuring exceptional heat resistance, oxidation protection, and long service life under extreme operating conditions.
1. Material Composition
SSM's threaded alloy flanges are forged from high-temperature resistant alloy steels such as:
ASTM A182 F11 / F22 (Cr-Mo Alloy Steel)
ASTM A182 F5 / F9 (Cr-Mo Alloy Steel)
ASTM A182 F91 (9Cr-1Mo-V Alloy Steel)
Typical chemical composition:
| Element | F11 | F22 | F91 |
|---|---|---|---|
| Carbon (C) | ≤0.15% | ≤0.15% | 0.08–0.12% |
| Chromium (Cr) | 1.0–1.5% | 2.0–2.5% | 8.0–9.5% |
| Molybdenum (Mo) | 0.44–0.65% | 0.87–1.13% | 0.85–1.05% |
| Vanadium (V) | - | - | 0.18–0.25% |
| Nickel (Ni) | ≤0.40% | ≤0.40% | ≤0.40% |
These alloying elements enhance creep strength, corrosion resistance, and oxidation resistance, making them ideal for high-pressure and high-temperature steam pipelines.
2. Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 415–620 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥20% |
| Hardness | ≤187 HB |
| Service Temperature | Up to 600°C (1112°F) |
3. Product Description
A threaded alloy flange connects to a pipe via a screw thread, eliminating the need for welding. This design is especially beneficial for high-temperature power systems, where welded joints could weaken under thermal stress.
Standard: ASME B16.5 / B16.11
Pressure Rating: Class 150 – 2500
Size Range: NPS ½" – 24"
Thread Type: NPT / BSP / BSPT
4. Advantages
✅ Excellent heat and oxidation resistance – stable performance at high temperatures.
✅ Strong mechanical integrity – retains strength under prolonged thermal stress.
✅ No welding required – ideal for maintenance or system upgrades.
✅ Corrosion and scaling resistance – ideal for steam and hot gas lines.
✅ Easy assembly/disassembly – convenient for confined or critical areas.
5. Limitations
⚠️ Not recommended for severe vibration or cyclic pressure systems.
⚠️ More expensive than carbon steel due to alloying elements.
⚠️ Threaded joints may require periodic tightening in high-temperature service.
6. Applications
Power Plants – steam, turbine, and boiler systems
Petrochemical Plants – superheated steam pipelines
Oil Refineries – high-temperature process lines
Heat Exchangers & Reactors
Industrial Furnaces & Gas Systems
7. Why Choose SSM
Over 30 years of manufacturing expertise in forged alloy steel products
ISO 9001 / EN 10204 3.1 / PED certified
Advanced CNC machining & heat treatment facilities
Strict quality control and 100% inspection before delivery
Customized flange solutions according to ASME, DIN, GOST, and JIS
8. Conclusion
SSM's High-Temperature Threaded Alloy Flanges are the ideal solution for power generation and high-pressure steam systems, providing exceptional durability, heat resistance, and safety performance.
📩 Contact SSM today for technical specifications, drawings, or a customized quotation for your power plant piping projects.
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