cobalt alloy net's blog
January 8, 2019 by cobalt alloy net
What Is Stellite Alloy
Stellite alloy is a range of cobalt-chromium alloys designed for wear resistance. It may also contain tungsten or molybdenum and a small but important amount of carbon.
Applications of Stellite Alloy
Typical applications include saw teeth, hardfacing, and acid-resistant machine parts. Stellite was a major improvement in the production of poppet valves and valve seats for the valves, particularly exhaust valves, of internal combustion engines. By reducing their erosion from hot gases, the interval between maintenance and re-grinding of their seats was dramatically lengthened.
While Stellite remains the material of choice for certain internal parts in industrial process valves (valve seat hardfacing), its use has been discouraged in nuclear power plants. In piping that can communicate with the reactor, tiny amounts of Stellite would be released into the process fluid and eventually enter the reactor.
Properties of Stellite Alloy
Stellite is a family of completely non-magnetic and corrosion-resistant cobalt alloys of various compositions that have been optimised for different uses. Stellite alloys display outstanding hardness and toughness, and are also usually very resistant to corrosion. Stellite alloys are so hard that they are very difficult to machine, and anything made from them is, as a result, very expensive. Typically, a Stellite part is precisely cast so that only minimal machining is necessary.
If you wanna know more information about Stellite Alloy 20 , please contact us.
December 24, 2018 by cobalt alloy net
Applications of Stellite Alloy 12
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
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December 20, 2018 by cobalt alloy net
Cobalt Chrome Alloy No. 1 is used for high normal temperature hardness, strong wear-resistant grain wear and corrosion resistance. Used for rotating seal rings, cone bearings, sleeves, drill bits, etc.
Cobalt Chrome Alloy No. 4 is used for high wear resistance, excellent high temperature strength and corrosion resistance. Used in copper, aluminum alloy hot stamping die, hot extrusion die, dry battery die, etc.
Cobalt Chrome Alloy No. 6 has good wear resistance, high temperature resistance, thermal shock resistance and scratch resistance. Used for engine valves, high temperature and high pressure valve sealing surfaces, hot scissors blades, turbine blades, etc.
Cobalt Chrome Alloy No. 12 is highly resistant to wear, corrosion and scratch resistance. For high temperature, high pressure valves, shearing blades, serrations, screw pushers, etc.
Cobalt Chrome Alloy No. 20: high normal temperature and high temperature hardness, strong abrasion resistance and abrasion resistance. For high pressure seat, wear cotton,
HS114 (cobalt alloy wire) for high wear resistance, excellent high temperature and corrosion resistance. Used in copper, aluminum alloy hot stamping die, hot extrusion die, dry battery die, etc.
HS111 (cobalt alloy welding wire) has good wear resistance, high temperature resistance, thermal shock resistance and scratch resistance. Used for engine valves, high temperature and high pressure valve sealing surfaces, hot scissors blades, turbine blades, etc.
HS112 (cobalt alloy wire) is highly resistant to abrasion, corrosion and scratching. For high temperature, high pressure valves, shearing blades, serrations, screw pushers, etc.
HS113 (cobalt alloy welding wire) high normal temperature and high temperature hardness, strong abrasion resistance wear resistance. Used for high pressure seat wear cotton panels.
December 18, 2018 by cobalt alloy net
Matters needing attention when storing Cobalt Alloy Plate wire:
1. Cobalt alloy wire can not be placed too high.
2. For barreled cobalt alloy wire, do not roll during handling, and the container should not be tilted or tilted to avoid the wire being entangled in the tube and hindering the use.
3. During the handling process, avoid littering and prevent the package from being damaged. Once the package is damaged, it may cause the cobalt alloy wire to absorb moisture and rust.
4. Cobalt alloy welding wire should be placed in a special welding material library for storage. Pay attention to the ventilation and drying of the warehouse. The relative humidity of the air should be controlled below 60%. Keep the distance between the ground and the wall at 30cm.
5. The models and specifications are stored separately and cannot be mixed.
6. The CO2 used in the flux-cored wire should be pure anhydrous gas.
7. Under normal circumstances, the flux-cored wire does not need to be dried, and should be used up as soon as possible after opening. When the Cobalt Chrome Alloy wire is not used up, it should be covered with a canvas, plastic cloth or other items to cover the wire feeder (or wire spool). To reduce the contact with moisture in the air.
December 13, 2018 by cobalt alloy net
Cobalt based alloys are used in the dental industry for making dental prosthesis. They are an economical alternative to Gold & Silver based alloys (precious) but perform well due to their mechanical properties and biocompatibility.
Over View of Main Physical Properties
1. Good electrical insulation
2. High mechanical strength
3. Excellent wear resistance
4.Excellent wear resistance
5. Low dielectric constant
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December 10, 2018 by cobalt alloy net
Selection method: After the welding melt is cooled, if the metallographic structure of the welded part is consistent with the mold base material, the welding quality can be ensured; if it is inconsistent, sand eyes, cracks, or poor adhesion and falling off may occur.
Laser welding, welding material selection affects welding quality:
1. If the same metal strip as the base metal of the mold is selected as the laser cobalt-based welding wire, the metallurgical structure after the molten metal will be inconsistent with the base metal of the mold, which will affect the welding quality.
2. If a Cobalt Alloy Plate wire is selected, or a material close to stainless steel is used as a laser wire, the above problems will also occur, and the hardness after welding cannot be guaranteed. Because stainless steel has less carbon content and lower hardness, the welded position after welding is prone to wear.
3. For different mold materials, the choice of cobalt alloy wire type is not very strict, as long as the welding and the base material are welded and the hardness is consistent, the welding quality can be achieved.
4. The selection of common cobalt alloy welding wire with a diameter of 0.3mm, 0.4mm and 0.5mm, and the type of cobalt alloy welding wire is mainly determined according to the use and hardness of the mold. However, the use parameters of each laser welder are different. Therefore, when selecting the cobalt alloy wire type, the wire use instructions should be used as a reference, depending on the parameters and operating habits of the laser welder.
Since the laser welding wire is an alloy material, not a stainless steel wire, it may rust if it is not well preserved. Some laser welding wires are coated with a thin layer of anti-rust material on the surface, but the anti-rust layer of the plating should not be too thick, otherwise it will affect the welding quality, because the anti-rust layer is equivalent to impurities in the welding process. If the Sytop Cobalt Alloy wire is rusted, use sandpaper to polish the surface rust layer, which can be used without affecting the welding quality.
November 28, 2018 by cobalt alloy net
1. Cobalt alloy electrode: In low temperature environment, low-hydrogen or ultra-low-hydrogen welding consumables should be selected as much as possible, and baking and heat preservation measures should be strictly applied to the welding consumables;
2. Pre-weld protection: Shielding in the welding steel structure working area, so that the welding area forms a relatively closed space, reducing heat loss. If the protective shed is unconditionally set, other effective measures should be taken to protect the welding area; during gas shielded welding, Welding gas cylinders should also take corresponding measures to keep warm;
3. Preheating and interlaminar temperature: The preheating temperature in a low temperature environment should be slightly higher than the preheating temperature of the welded steel structure of the cobalt alloy electrode at normal temperature, and the heating zone is greater than or equal to twice the thickness of the steel plate and not less than 100 in each direction of the component welding zone. In the base metal in the range of millimeters, the temperature between the welding layers is not lower than the preheating temperature or the minimum temperature specified by the standard (JGJ81-2002) is 20 °C (both high values);
4. Increase the heat input during tack welding: appropriately increase the heat input of the tack weld, increase the cross section and length of the weld, and use the same preheating conditions as the formal weld, do not arc on the base metal outside the groove, and extinguish the arc When the crater must be filled, it can effectively reduce the shrinkage crack caused by the positioning welding;
5. Cobalt Chrome Alloy electrode welding process: use narrow swing, multi-layer multi-pass welding, and strictly control the interlayer temperature;
6. Cobalt alloy welding rod after welding heat and heat preservation: After welding, the welded joint is post-heat-heat-treated, which can effectively control t8/5, which is conducive to the diffusion of hydrogen gas and prevent cold cracks caused by excessively fast cooling rate. After the hot temperature, the preheating temperature can also be appropriately lowered.
In short, before the construction of the low-temperature welded steel structure of the Cobalt Alloy Plate electrode steel structure, the welding process qualification test must be done according to the actual situation. If necessary, the low-temperature weldability test should be carried out for the specific steel grade, and a suitable welding procedure guide should be made to guide the actual situation. welding. In the low temperature environment, the adverse effects on the welder's operation should also be given enough attention. The general ambient temperature should not be lower than -15 °C.
November 22, 2018 by cobalt alloy net
Service of Stellite Alloy 12 Factory - Cobaltalloy:
1.Supply Stellite 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.
Production Process—Powder metallurgy
Mixing powder – Pressing – sintering – machining
Cobaltalloy.net guarantee the balls roundness and accuracy, also the tightness of Stellite 20 Ball and Stellite Alloy Valve Seat.
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November 19, 2018 by cobalt alloy net
Powder metallurgy production Cobalt-chromium Alloy products, one of the world's three suppliers.
Advanced production and testing equipment and professional R & D team.
Product Details (Stellite Alloy 12)
Stellite alloys consist of complex carbides in an alloy matrix. Their exceptional wear resistance is due mainly to the unique inherent characteristics of the hard carbide phase dispersed in a CoCr alloy matrix.
Stellite 12 Saw tips are made of Stellite alloy in grade Co12,so the following information is all about Co12.
(1). Stellite Alloy 12 could be considered an intermediate alloy .
(2). It contains a higher fraction of hard, brittle carbides than Stellite Alloy 6
(3).It has increased resistance to low angle erosion, abrasion, and severe sliding wear while stretaining reasonable impact and cavitation resistance.
(4). Stellite Alloy 12 is often used self-mated or running against .
We devote ourselves to satisfy clients' individual requirements. We are proudly enjoying the respect from other stellite alloy companies through our spirit of keep improving perfection and a professional R&D team featuring high quality, responsible and innovative.
November 13, 2018 by cobalt alloy net
Chemical properties of stellite alloy:
There are several types and variants of stellite alloy. All types contain different numbers of the following different number of elements:
Most of these alloys contain four to six of these elements. Of all these elements, carbon and chromium are the most important. Therefore, both of them play the biggest role in the performance of the alloy.
Manufacturing process of stellite alloy:
Stellite Alloy 3 is produced by a range of different processes or methods. These methods include forging or hot forging, hard surface deposition, powder metal, and finally casting. Processing and grinding are more difficult than steel. Therefore, high-performance processing equipment and special processing tools are required. Usually, it is machined by grinding instead of cutting.
Application of stellite alloy:
Typical applications include sawtooth, hardfacing and acid resistant machine parts. Stellite alloy is a major improvement in the production of valves for internal combustion engines, especially for poppet valves and valve seats. By reducing the erosion of hot gases, the spacing between the maintenance and re-grinding of the seats is significantly extended.
Although Stellite alloy is still the material of choice for certain internal parts of industrial process valves (seat surface hardening), it is discouraged in nuclear power plants. In the conduit that can be in communication with the reactor, a small amount of stellite alloy will be released into the process fluid and eventually into the reactor.
Stellite Alloy 12 was also used as the first cage material for commercial prosthetic heart valves, and the Starr-Edwards cage ball valve was first implanted in 1960.