Stellite Alloy 3 Valve Seat (cobaltalloy)

Stellite 3 valve ball and seat are very important parts of underground oil-well pump , they always show up together and cooperate very good , no better material can replace Cobalt-chromium Alloy now .

The valve balls are made of Cobalt-chromium Alloy 20 and valve seat are made of Cobalt-chromium Alloy 3 . They are a good team to resist the wear and corrosion issue in oil and gas pimping process.

What is the Details of our stellite valve seat and ball?

Material Cobalt-chromium Alloy –Grade 3 and 20
Process Powder Metallurgy , it is short for PM
Hardness 53-59HRC
Density 8.6-8.8 g/cm ³
Size Diameter 11-60 mm
Properties Wear and corrosion resistance, high temperature resistance
Application Oil well pump components , wear and corrosion resistance parts
Instructions Drawing made upon cutomers request
Usage One balls with one valve
Tolerance control Turning or grinding surface , tolerance upon drawing
Production lead time Samples 10 days , normal order 30 days
Production capacity 40,000pcs one month.
Package Carton or wooden case , pallet for export

Chemical composition

Grade C Mn Si Cr Ni Mo W Co Fe P S Density




Stellite Alloy 3 2.0-2.7 1.0 1.0 29-33 3.0 11-14 Bal. 3.0 ≤0.03 ≤0.03 8.55 51-55
Cobalt-chromium Alloy 20 2.2-3.0 2.0 30-34 3.0 1.0 14-18 Bal. 3.0 ≤0.05 ≤0.05 8.65 53-59

Production Process—Powder metallurgy

Mixing powder – Pressing – sintering – machining

We guarantee the balls roundness and accuracy, also the tightness of ball and seat.

Our service:

1.Supply Cobalt-chromium Alloy parts upon customer drawing and request

2.Free samples could be provided for testing

3.Both big quantity and small quantity are acceptable , Order flexible. click for further information.

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