Corrosion Resistance Material Sytop Stellite Alloy

The professional Stellite Alloy manufacturer – sytop owns its advantages in the industrial metal materials area. The company specializes in the R&D, manufacturing and sales of investment casting and powder metallurgy components made of Stellite alloy, Cobalt Chrome alloy. Founded in Year 2001, SYTOP has 16 years producing experience and 10 years exporting experience. Our solid quality and integrity wins us a good name in our customers.

PM products and castings of alloy are applied in the industries as nuclear, petrochemistry, battery , food etc. Regular products include valve balls, seat , bearings , sleeves, pump parts pears , gears , batteries dies , nozzles and cutters.

Application of Stellite Alloy 6 :

According to supplied drawing and metal compositions, many kinds of parts can be made by investment casting and powder metallurgy methods, such as valve seat insert, forging mould, valve cage and stellite series 3, 4, 6, 12, 21, 23, 25, 27, 30, 31, 36, as well as Co# 400, Umco 50s cobalt based alloy products.

Typical Applications :valve seat inserts ,valve seat rings ,valve cage,bearings,cutter edge,still mill guide roll,engine valve ,high temperature and pressure valve and turbine blade ,saw teeth,screw flight,sleeve,wear plate ,and variety wear parts.

We are proud to support our customers to get more values, to create new business. We look forward to fulfilling all your future Stellite 3 needs. Our company always adhere to the”quality first, credibility first”business philosophy, and from time to time to seize the opportunity, deepen the reform, innovation, the quality of our products to the international road to higher quality, better prices, to reciprocate the trust of old and new friends from all walks of life.

Applications of Sytop Cobalt Chrome Alloy

We are one of the leading manufacturers of Cobalt Alloy and stellite alloy mechanical parts offered at an unbeaten price. we have almost 20 years producing experience for over 500 kinds of products and 10 years exporting experience served satisfied customers in over 50 countries.

Cobalt Chrome Alloy is a cobalt-based alloy with a higher density than stainless steel. It is resistant to corrosion, abrasion and heat. It combines good mechanical properties with excellent tribological properties. Its low carbon content and uniformity of carbide distribution in its microstructure give it a good polishing performance.

This alloy is used in the medical field to make orthopedic prostheses for the knee, hip and spine. Cobalt-chromium alloys have higher hardness than titanium alloys and stainless steels.

This alloy grade is also used in the dental field for the fixation of denture devices (tooth bridges…)

For the above purposes, we recommend the following different forms of cobalt-chromium alloy:

Small diameter bar,

Cobalt-chromium discs of different thicknesses for CAD/CAM.

The discs we offer are made from forged bars. Its uniformity of distribution and fine grain size in its microstructure is an advantage for its use in the manufacture of dental prostheses.

We recommend the metal molybdenum grade (cobalt chrome molybdenum alloy). The Cobalt Chromium Alloy contains no nickel and antimony elements and has a fine structure. It is obtained by powder metallurgy and can avoid deformation of parts after machining. Another benefit of molybdenum for the manufacture of dental prostheses is that it maintains the stability of the alloy at high temperatures, making it easy to bond to ceramics.

The Difference Between Cobalt Alloy And Nickel Alloy

The Difference Between Cobalt Alloy And Nickel Alloy.

1.Thermal stability

One of the important reasons why cobalt alloys are used as aviation material is its excellent thermal stability. Cobalt alloys have a high melting point and thermal conductivity and less thermal expansion after heating. It can be seen from this that cobalt alloys have advantages in thermal stability.

Compared with cobalt alloys, nickel alloys have a higher strength but more brittle. It is easier to be broken on occasions of impact. When the temperature rises to 800℃ (the operating temperature of some engines), nickel alloys can’t be used, while cobalt alloys retain strong.


The stiffness means the ability to resist deformation. Nickel alloys have a lower stiffness than cobalt alloys in various temperature. With the temperatures above 700℃, the properties of nickel alloys are completely destroyed.

3.Oxidation resistance

Cobalt Chromium Alloy has superior resistance to high-temperature oxidation. Cobalt alloys have excellent resistance to high-temperature oxidation and can be used in the case of 800℃.

4.Corrosion Resistance

Corrosion resistance of both alloys was tested as follows. With 4 m/s rate, combustion air containing 5-5 or 5-6 sea salt, NO. 2 fuel oil (0.3% ~ 0.45% sulfur ), and air – oil ratio for 30:1, the sample was rotated cooled from 800℃ to 260 ℃with cold air every an hour. This dynamic hot corrosion test after the cycle test for 200 hours in the combustion apparatus shows that metal loss portion of the cobalt alloys is significantly lower than that of nickel alloys.

In conclusion, the performance of Cobalt Chrome Alloy is much better than nickel alloys, ensuring the use and life of the products. Cobalt alloys have the following advantages: Above all, the hardness of the cobalt alloys are much lower than that of turbine rotors, which makes it safer. In addition, cobalt alloys have a higher melting point and thermal conductivity, and the amount of thermal expansion after heating is small. It has an advantage in thermal stability. What’s more, the strength of the cobalt alloys are slightly lower at normal temperature, but the elongation is higher. Last, cobalt alloys have excellent resistance to high-temperature oxidation and can be continuously used in an environment of about 800℃. The corrosion resistance of cobalt alloys is much better than that of nickel alloys as well.

What You Need To Know About The Cobalt Alloy

Cobalt metal is mainly used to make alloys. Cobalt Alloy is the general name of one or more alloys made of cobalt and chromium, tungsten, iron and nickel. A tool containing cobalt can significantly improve the performance of wear resistance and cutting of steel. As an important material for cutting tools containing gold and aluminum, stellite alloys containing more than 50% cobalt won’t lose their original hardness even if heated to 1000℃. Cobalt combines the carbide grains of other metals in the alloy composition to make the alloy more ductile and less sensitive to impact. This alloy is welded on the surface of parts, which can increase the life of parts by 3-7 times.

Under heating, the temperature at which magnetism is lost is called the Curie point. The Curie point of iron is 769℃, the nickel is 358℃, and the cobalt is up to 1150℃. Magnetic steel containing 60% cobalt is 2.5 times stronger than ordinary magnetic steel. Under vibration, generally magnetic steel loses about 1/3 of its magnetic properties, while cobalt steel loses only 2%-3.5%. Obviously, cobalt has an advantage in magnetic materials. In addition, cobalt is widely used in electroplating, glass, dying, medical and medical applications. Besides, cobalt may also be used to make nuclear weapons, a theoretical atomic bomb or hydrogen bomb, which is installed in a cobalt shell. It can turn cobalt into deadly radioactive dust after the explosion.

Wrought Cobalt Chrome Alloy is mainly strengthened by solid solution and carbide. The main types of carbides are MC, M6C, M23C6, M7C3, etc. The bulk MC carbide strengthening effect is not obvious. Carbides (M23C6) located at grain boundaries can prevent grain boundary migration and thus contribute to durable strength. It is shown that the endurance strength of cobalt-based deformation superalloy is lower than that of nickel-based deformation superalloy in the range of low and medium temperature, but it shows higher durability at temperatures above 980℃.

Stellite Alloy Products (Brief Introduction)

Stellite Alloy are the advantaged products for us , we have produced more than thousands specifications and all of them are produced upon customer’s drawing .

Chemical Composition

Brand NO. C Mn Si Cr Ni Mo W Co Fe Others Density Hardness
Stellite 6 0.90



1.00 1.50 27.0



3.00 1.50 3.50



Bal. 3.00 p.0.3Max


8.35g/cm3 38-44HRC

Applications of Cobalt Chrome Alloy

1.High pressure cleaning 2.Auto cleaning

3.Industrial equipment cleaning 4.Spray coating

5.Gas desulphurization 6.Steel pipe hardening

7.Paper making 8.Humidifying /Disinfection

9.High pressure phosphorus removal 10.Dust removal /proof

11.Air purification 12.Tail gas treatment

13.Corrupt cascade 14.Dry blasting 15.Gunite

We are always pursuing to the company principle “Quality First, Customer foremost” We never ever stopped our steps to innovate and improve more and more. Welcome your visit.