STP 6 Cobalt Alloy Bush

The cobalt alloy bushings are available in different grades with different hardness as follows.

STP Alloy chemical composition

• 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%
• STP6  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 19  C: 1.5-2.0%, Mn: ≤1.0%, Si: ≤1.0%, Cr: 29.5～32.5%, Ni: ≤3.0%, Mo: -,  W: 9.5～11.5%, 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%

STP 6 bushing can be used for many industries, such as oil & gas pumps, galvanized production lines, etc, with its excellent wear and corrosion resistance if the user environment needs the parts to have high temperature, wear, and corrosion resistance simultaneously. STP6 bushing is also a good part of the butterfly valve. We have produced thousands of specifications for the STP 6 bush, all based on the customer’s drawing. This is one of our mature products. Quality can be guaranteed.

Now, we can supply many kinds of cobalt alloy bushing, such as STP 3, STP 4, STP 6, STP 12, etc. If you need other cobalt alloy products, we can also supply many rods, plates, blades, saw teeth, valve seats, valve balls, etc.

We are happy to supply samples for your test. Please leave an inquiry if you are interested.