STP 6 Cobalt Alloy Valve Seat

Some valves are required to provide a high standard of operation and ensure a sufficiently long service life under high temperature, high pressure, or high power loads. Some are needed to be used in extremely cold environments. Depending on the use environment and the contact medium, some parts of the valve, such as bushings, valve seats, valve cores, and sealing rings, require unique materials to be customized for production. Cobalt alloy products are widely used in valve components to ensure long-term stable use in extreme environments.

Valve seats are part of an engine or other machinery that comes into contact with the valve and helps to seal it. STP 6 valve seats are designed to provide superior wear resistance, especially in high-performance engines or engines that run at high temperatures. The cobalt alloys can withstand the wear and tear from the valve repeatedly opening and closing, as well as the high temperatures and corrosive environments that can occur in engines.

STP 3 valve seats made of cobalt alloy can resist wear, corrosion, and high temperature at the same time. It can be used in valves to act as a seal.  Data is as follows for reference.

• STP 1  C: 2.2～2.8%, Mn: -, Si: ≤2.0%, Cr: 29.0～33.0%, Ni: ≤3.0%, Mo: ≤1.0%,  W: 11.0～14.0%, Co: Bal., Fe: ≤3%
• STP 3  C: 2.0～2.7%, Mn: ≤1.0%, Si: ≤1.0%, Cr: 29.0～33.0%, Ni: ≤3.0%, Mo: -,  W: 11.0～14.0%, Co: Bal., Fe: ≤3%
• STP 4  C: 0.8～1.3%, Mn: ≤1.0%, Si: ≤1.5%, Cr: 28.0～32.0%, Ni: ≤3.0%, Mo: ≤1.5%,  W: 12.5～15.5%, Co: Bal., Fe: ≤3%
• STP 6  C: 0.9～1.4%, Mn: ≤1.0%, Si: ≤1.5%, Cr: 27.0～31.0%, Ni: ≤3.0%, Mo: ≤1.5%,  W: 3.5～5.5%, Co: Bal., Fe: ≤3%
• STP 12  C: 1.1～1.7%, Mn: ≤1.0%, Si: ≤1.0%, Cr: 28.0～32.0%, Ni: ≤3.0%, Mo: -,  W: 7.0～9.5%, Co: Bal., Fe: ≤3%
• STP20  C: 2.2～3.0%, Mn: -, Si: ≤2.0%, Cr: 25.0～29.0%, Ni: ≤3.0%, Mo: ≤1.0%,  W: 14.0～19.0%, Co: Bal., Fe: ≤3%

Cobalt alloy valve seats are commonly used in aircraft engines, racing engines, and other high-performance applications. They can also be used in industrial valves, such as those used in chemical or petrochemical processing, where high temperature and corrosion resistance are required.