Advantages of Cemented Carbide Valve Seats

1. Extreme Hardness & Outstanding Wear Resistance

• Hardness ranges from HRA 85–93 (HV 1200–1800), far higher than stainless steel (HV 200–300), Stellite hardfacing (HV 400–550) and ceramic coatings (HV 1000–1300).
• Its service life against wear is 5 to 10 times longer than that of stainless steel. It maintains stable sealing without leakage for a long time when exposed to slurry, sandy crude oil, ash water and other particle-containing fluids.
• Mainly composed of tungsten carbide (WC) and cobalt (Co), with WC grain size of 0.8–3.5 μm, balancing excellent wear resistance and impact toughness.

2. Excellent Corrosion Resistance

• Performs stably in strong acid, strong alkali environments with a pH range of 1 to 14, and media with chloride ions up to 20,000 ppm. It resists intergranular corrosion and stress corrosion cracking effectively.
• Tolerates hydrogen sulfide, carbon dioxide and other corrosive substances, suitable for oil & gas and chemical industries.

3. High Temperature & Pressure Resistance with Good Thermal Stability

• Continuous operating temperature exceeds 600℃. It retains high hardness at elevated temperatures with no softening or strength decline.
• Compressive strength reaches 2200–3500 MPa, applicable for high-pressure conditions up to PN 10–63 MPa, with strong deformation and impact resistance.
• Thermal expansion coefficient: 4.5–6.2×10⁻⁶/K, well matched with valve body materials such as WC9 and CF8M. It minimizes thermal cycling stress and delivers excellent thermal shock resistance.

4. High-Precision & Stable Sealing Performance

• The sealing surface is precisely ground and polished with surface roughness Ra ≤ 0.2 μm. Combined with cemented carbide valve plugs, it achieves zero-leakage hard sealing.
• High dimensional accuracy ensures no deformation or loosening during long-term operation, enabling flexible opening and closing without jamming.

5. Long Service Life & Low Maintenance Cost

• Its overall service life is 3 to 8 times that of conventional metal valve seats, greatly reducing replacement frequency and equipment downtime.
• It cuts spare parts stock and labor costs for maintenance, delivering high comprehensive cost performance especially for continuous production lines.

6. Flexible Adaptation to Diverse Working Conditions

• Low cobalt content (6%–9%): Higher hardness and red hardness, suitable for high-temperature and high-pressure steam.
• High cobalt content (12%–15%): Higher toughness and thermal shock resistance, for frequent on-off operation and particle-laden media.

Typical Application Scenarios

• Oil & Gas: Sandy oil wells, high-pressure sulfur-resistant wells, offshore oil production.
• Coal Chemical & Power Industry: Ash water, coal powder, high-temperature high-pressure steam valves.
• Chemical Industry: Strong acid, strong alkali and high-chloride corrosive fluid pipelines.
• Mining Industry: Slurry, tailings and particle-containing fluid delivery valves.