What is Stellite coating?
Table of Contents
What is Stellite coating?
Stellite Alloys are a family of Cobalt- Chromium ‘super alloys’ consisting of complex carbides. They are completely non-magnetic and offer a high level of wear resistance and are particularly effective in providing chemical resistance.
How Stellite coating is applied?
Kennametal Stellite uses various thermal spraying techniques to apply wear-resistant coatings to components, including High Velocity Oxygen Fuel (“HVOF”) spraying, plasma spraying, and flame spraying.
Is carbide harder than stainless steel?
Carbide is much denser than both steel and Titanium. Its finished product is often polished and finished with harder abrasives such as diamonds. It’s truly a versatile and durable material.
Why are Stellite valves used?
Relia Stellite seat ball valve provides freedom thermal expansion of ball without jamming even at high temperature. The material most often used for hardfacing valve internals is Stellite 6, a cobalt alloy that contains chromium, tungsten, carbon and other elements (Figure 1).
What are the properties of Stellite?
Mechanical Properties of Stellite 1 Alloy
| Properties | Metric | Imperial |
|---|---|---|
| Hardness, Rockwell C | 50-58 | 50-58 |
| Tensile strength | 1195 MPa | 173 ksi |
| Yield strength | 1050 MPa | 152 ksi |
| Modulus of elasticity | 230 GPa | 33.4×106 psi |
Is Stellite corrosion resistant?
Stellite alloys are non-magnetic and typically associated with high corrosion resistance and as with many alloys, they are adaptable and can be refined for a range of specific applications. The carbides present in the Co-Cr-W-based stellite alloys are of chromium-rich M7C3 type.
Is tungsten carbide brittle or ductile?
Tungsten Carbide is a hard, brittle ceramic which, when combined with 6\% to 10\% Cobalt, forms a tough Cermet (Ceramic-Metal). This material was developed for use in cutting tools, having hard ceramic crystals of a few microns in size within a ductile metal matrix.
Is carbide stronger than tungsten?
Notice that the pure tungsten ranks 7.5 on the Mohs scale. This tungsten, then although it’s durable, can still be scratched. On the other hand, tungsten carbide is even more durable and scratch-resistant. It’s from Mohs 8 to 9, which is even harder and durable.
Where is stellite used?
Some of the major applications of stellite include the following: Saw teeth, hardfacing, and acid-resistant machine parts. Poppet valves, valve seats and exhaust valves of internal combustion engine. M2HB machine gun and machine gun barrels.
What is tungsten carbide coating?
The tungsten carbide coating, chromium carbide, stellite is widely used for metallic seats and balls with metallic seal. This coating is carried out using the HVOF (Hight Velocity Oxygen Fuel) process, which, using high speed, projects carbide particles in the seals and achieves high adhesion strength, 1400 HV hardness, and low porosity.
What are Stellite 6 coating alloys?
Stellite 6 Coating Stellite Alloys are a family of Cobalt- Chromium ‘super alloys’ consisting of complex carbides. They are completely non-magnetic and offer a high level of wear resistance and are particularly effective in providing chemical resistance.
Why choose Stellite 6 coating for ball valves?
The process can also be carried out on a wider range of base materials and is more precise in nature. At B&B we are able to effectively coat half inch Ball Valves with Stellite 6 coating.
What are the benefits of carbide coating?
Relatively thin layers of carbide coatings can offer dramatic protection against abrasion, galling, fretting, and erosion. Hannecard – ASB provides advanced tungsten carbide and chrome carbide spray coating services to near limitless types of substrate.