STP 20 Cobalt Alloy Valve Seats

SYTOP has produced thousands of cobalt alloy products, all of which are made on the customer’s drawing.

STP 20 valves can be used in many industries, such as oil & gas pumps and valves. A STP 20 valve is also a good choice for a homogenizer. Cobalt alloy has good wear and corrosion resistance without affecting health, so it is widely used in some food processing machinery.

STP 20 alloy is tough to process because of its high hardness, SYTOP has a lot of experience processing STP 20 valve seats, rods and balls. We always do our best to keep prices as low as possible without sacrificing quality and constantly investigate new quality improvement methods.

STP alloy chemical compositions sheet.

• 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%
• STP 20  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%

If you have more interest in other cobalt alloys, leave us a message to get more information.