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DG tungsten carbide thermal spraying powder WC-20CrC-7Ni is used for HVOF, HVAF, PLS spraying

Product

Plasma welding of cobalt-based alloys to prepare weld overlays of different hardnesses

Cobalt-based alloys are alloys with high-temperature oxidation resistance up to 1000 degrees Celsius. They also exhibit excellent resistance to high-temperature fatigue and hot corrosion, making them widely used for the repair and protection of valves, valve seats, bearings, and other workpieces, as well as for surface welding of various wear-resistant panels and rollers. In addition to their resistance to high-temperature oxidation, cobalt-based alloys also exhibit excellent corrosion resistance to 50% phosphoric acid and 5% sulfuric acid. Depending on the hardness of the cobalt-based alloy powder, different applications are possible. Currently, our factory produces cobalt-based alloy powders with the following hardness levels: 

DG.Co6:
HRC: 37-43, 
Chemical composition: C1.2, Cr20.3, Fe2.5, Ni2.5, Si1.1, W4, Co Bal.
Typical applications:  turbine blades, engine valves, high-temperature and high-pressure valves, etc.

DG.Co12: 
HRC: 40-50, 
Chemical composition: C1.5, Cr30.5, Fe2.5, Ni2.5, Si1.5, W8, Co Bal.
Typical applications:  high-temperature and high-pressure valves, saw teeth, screws, etc.

DG.Co190: 
HRC: ≥57, 
Chemical composition: C3.3, Cr26, Si0.8, W14, Co Bal.
Typical applications:  Various drilling tools used in the petroleum industry.

DG.Co21: 
HRC: 25-30, 
Chemical composition: C.025, Cr27.5, Fe2.0, Ni2.5, Si2, W0.15, Mo5.5, Mn1.0, Co Bal.
Typical applications:  turbine blades, various valves, valve seats, etc.

DG.Co158: 
HRC: 38-42, 
Chemical composition: C0.75, Cr26.0, Fe3.0, Ni3.0, Si1.9, B0.7, W5.5, Mo0.5, Mn0.1, Co Bal.
Typical applications:  wear-resistant parts for high-temperature working environments, resistant to hot gas corrosion and impact.

DG.Co158V:
HRC: 45-50,
Chemical composition: C1.0, Cr30.0, Fe4.0, Ni3.0, Si1.0, B0.7, W8.0, Mo0.5, Mn0.1, Co Bal.
Typical applications:  wear-resistant parts for high-temperature working environments, resistant to hot gas corrosion and impact.

Most cobalt-based alloys are processed by plasma welding, and a few can be processed by oxyacetylene spray welding. Currently, our cobalt-based alloys are produced by gas atomization. Compared with powder produced by water atomization, powder produced by gas atomization has rounder particles and better flow rate.