On 20210804, I received an inquiry from a US friend on Google. American friends are looking for 1 inch valve balls. In the exchange, I recommended the valve ball made of satellite 20 to him. The customer purchased 300 satellite 20 1 inch balls.
1. Material of cobalt-based alloy
First, let me introduce you to the cobalt-based alloy. Cobalt-based alloy is a wear-resistant, corrosion-resistant and high-temperature resistant material. Usually, we also call them cobalt chromium tungsten or Stellite. Let me show you the chemical composition and hardness of Stellite 20.
|Composition (% )||C||Si||Mn||Cr||Ni||S||P||Mo||W||Fe||Co||Hardness|
|Stellite 20||2.30- 2.65||≤ 1.0||≤ 1.0||31.0- 34.0||≤ 2.5||≤ 0.04||≤ 0.04||≤1.0||16.0- 18.0||≤ 2.5||Bal.||HRC:52- 60|
2. Introduce some properties of Stellite (cobalt-based) alloy:
①. It has high strength, good thermal fatigue resistance, thermal corrosion resistance and wear resistance, and has good weldability.
②. The thermal stability of carbide in cobalt-based alloy is good.
③. Cobalt-based alloy has good heat resistance and corrosion resistance.
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