Solutions antidesgaste personalised and with value added
With the acquisition of Deloro
Like manufacturer and integral provider of solutions antidesgaste criticisms based in alloys for use in extreme surroundings characterised by his high temperature, corrosion and abrasion, Kennametal Stellite employs roughly to 1.300 people in seven primary installations operative all over the world and has headquarters in EE UU, Canada, Germany, Italy, India and China. It combines his own knowledges on metallic alloys and on materials with a skilled design and with the capacity of manufacture to supply solutions antidesgaste personalised and with value added for customers that belong to the industries of the oil and natural gas, of the generation of power, automotive sector, as well as to the aerospace sector and of defence, medical sector-dental, to the engineering of processes and to the engineering in general.
“Deloro Stellite Has a long path providing an exceptional value to the customers in surroundings very demanding and are delighted that they have joined to the team of Kennametal”, affirms Carlos Cardoso, president and CEO of Kennametal. “Aunando Leading technology of surfaces and our skilled knowledges on the science of materials, have increased the range of productive solutions that offer to our customers for surroundings of extreme wear”.
Known by his alloys of cobalt
In 1907, Michael John O'Brien and Elwood Haynes founded the company Deloro Smelting and Refining in the small Canadian village of Deloro, famous by the mines of cobalt. Haynes Abandoned the company in 1912 to devote to the components with base of nickel and went then when O'Brien created Deloro Stellite, skilled company in the manufacture of alloys Stellite of cobalt.
A portafolio of solutions for critical situations
The products of Stellite include:
- Stellite: alloys of cobalt with the best properties antidesgaste. They combine an exceptional resistance to the wear and to the heat and use in a big variety of applications.
- Deloro: Alloys of nickel that cover a wide range of hardnesses. They are used to to have melting-points lower, characteristic that does that they are the suitable material for the welding in dust or pulverización and melted.
- Tribaloy: Alloys of phases intermetálicas that they can be of nickel or of cobalt. His performance is exceptional in the wear of metal to metal to high temperatures.
- Nistelle: Alloys of nickel, anticorrosivas and with high melting-point. Developed to protect in front of aggressive chemicals or other means corrosivos.
- Stelcar: Alloys of nickel or of cobalt with particles of carbon. Only available in shape of dust for applications of coating.
- Jet Kote: dusts combined of hard metal and metal, designed specifically for the pulverización thermal sensors.
- Delcrome: Alloys of ironinging designed to offer resistance in front of the wear by abrasion to temperatures lower.
- DuraStell: coatings Metallic of high performance for his use in critical applications where the corrosion and the wear limit the useful life and the reliability of the pieces. It forms a metallurgical union with the material of sustrato that does that the process was ideal in cases in which the alloys and methods of conventional application can cause excessive deformation of the pieces or degradation of basic metals of high performance.
Kennametal Stellite Offers also services of value added like the fast development of components of smelting, final setting of valves of steam for generation of power, pieces entirely mechanised and services of coating. The pieces manufacture following different processes like the moldeo by investment and the mechanised of finishing and are designed to measure to fulfil with the needs of each customer. Besides, Kennametal Stellite offers his knowledges and experience in services of coating type HVOF (projection by oxicombustión of high speed) and coatings against wear.
Recently, a big energetic company with headquarters in EE UU had to confront in one of his plants to new challenges related with pipes supercríticas of drainage of steam and of ventilation. For this, an important manufacturer of machines commissioned to Kennametal Stellite valves for critical services. In the plant use MSBV (spherical valves with metallic seat) in pipes of drainage and ventilation to extract big quantities of condensed during the set up of the plant of manufacture with the end to obtain quickly dry steam sobrecalentado. The MSBV have to guarantee the estanqueidad to the steam to avoid the loss of power and maximizar the performance of the plant. This special electrical head office fed with fuels fossils works ininterrumpidamente of May to October because of the big demand of power of the systems of air conditioned. To achieve an annual balance, the plant of manufacture only works when it sues more power during the beaks of use. Every time that it detains or that sets up the plant, the MSBV activate and expose to operative conditions in which it uses steam supercrítico.
The MSBV in question had a spherical design with fixed seat, manufactured in Inconel forged 718 PH and revestidas with HVOF 80% Cr3C2 + 20% NiCr. This coating failed to the cape of 1 year and less than 500 mechanical cycles in service with exposed balls to steam supercrítico, extending the deterioration to zones in which it did not exist contact between the ball and the seats. After examining visualmente the components damaged detected a slight wear by friction and a typical behaviour of stress/fatigue.
The proofs determined that the main failure of the mechanism had been the fragility of the coating because of the precipitation of hard metal of chromium during the service through the agglutinative of coating. They manufactured new samples with three new coatings of Kennametal Stellite. They llevar numerous proofs to evaluate his behaviour in this specific application.
Once detected the cause, the back proofs revealed that the coating NiWCrBSi by pulverización and melted resulted more adapted to bear a high load of cojinete in case of thermal sensors crash. This coating is less sensitive to the aging to high temperatures and, therefore, is more durable in these so specific conditions.
A coating HVOF improved, manufactured from a mix of hard metals (W, Cr)C and WC in a matrix of nickel also obtained favourable results in the proofs. While it showed a similar ductility to the one of the coating HVOF Cr3C2-NiCr original, offered consistentemente a greater useful life in inferior services to the 540 °C (1.000 ºF).
With the backrest of these new technologies of coating installed new valves in the plant and his operation has been flawless during the past year. In consequence, the line MSBV of the manufacturer of valves for the energetic industry offers now two new coatings: HVOF (W, Cr)C-Neither designed for the normal service, and S&F NiWCrBSi designed especially for applications in which they produce thermal sensors crashes bass.
