Stellite 6b is supplied in the solution treated condition to ams 5894 and its wear resistant. Hightemperature hardness and wear resistance of stellite alloys. This factor is the primary reason cobalt alloys are used. Stellitetm 6b mill annealed 8,2 c38 0,471 x 103 stellitetm 6k mill annealed,3 c46 0,946 x 103 stellitetm 25 mill annealed 1hr. Haynes 25 l605 has a unique ability to resist corrosion in very severe environments. Haynes 25 l605 maintains good oxidation resistance up to 1900 f. It is made by a company whose name is stellite coatings in the usa and deloro stellite in the rest of the world. The material itself has been around since the 1900s and was originally seen as a substitute for traditional metal cutlery which suffered from general wear and tear and was also prone to staining. The higher tungsten content of stellite alloy 4 gives improved high temperature properties and an increase in abrasive wear resistance over stellite alloy 6, but not as good as stellite alloy 12 or 3. Written especially for design engineers, it presents an overview of a broad range of stainless steels both standard and proprietary their compositions, their properties, their fabrication, and their use.
High wear resistance, but at low hardness its rather difficult to use. It is a trademarked name of the deloro stellite company and was invented by elwood haynes 1 in the early 1900s as a substitute for cutlery that stained or that had to be constantly cleaned. The trademark owners of stellite claim that stellite 6 is the most widely used of their range of stellite alloys, offering a proven industry standard for generalpurpose wear resistance, and high mechanical and chemical perfromance in hostile environments. Pdf the basics of stellites in machining perspective. It may also contain tungsten or molybdenum and a small but important amount ofcarbon. Check availability with our sales department by submitting your inquiry below to see if a metal source, llc can provide your stellite alloy metal requirement. Composition weight % of elements of stellite grades. Like all stellite alloys, it has excellent resistance to oxidation but is not recommended for reducing acids. Stellite alloys chemical composition, mechanical properties and. This booklet cannot be used for paper 1 of the examination slp1 and hlp1, but the periodic table given in section 6 will be available as part of these examination papers. The difference in wear behaviour is more likely due to differences in the stellite coated composition and microstructure. Stellitetm 6b mill annealed 8,2 c38 0,471 x 10 3 stellitetm 6k mill annealed, 3 c46 0. Stellite alloys chemical composition, mechanical properties. The cocrw system alloy retains its hardness at elevated temperatures and is especially effective for wear applications at high temperatures or in a corrosive environment, and are widely used as a wear, corrosion, and heatresistant material 43.
Hpa cobalt 6b cocrw uns r30016 aka haynes 6b, hs 6b, stellite 6b. Dendritic cobalt is cast cobalt 6b, stellite 6k is cobalt 6b with 0. The alloy currently most suited for cutting tools, for example, is stellite 100, because this alloy is quite hard, maintains a good cutting edge at high temperature, and resists hardening and annealing. Selecting corrosion resisting alloys bulletin a5z ype 400 series cf8m cn7m durimet 20 monel m351 n7m chlorimet 2 on stellite 6 titanium conium 702conium 705.
Evaluation of microstructure and mechanical properties at the. Chemical compositions wt%, co in balance of stellite alloys 60 table 32. Kennametal stellites cobalt base alloys are available as cobalt rods, cobalt electrodes, cobalt wire and cobalt powder. Safety data sheet issuing date 20150206 revision date 20150306 revision number 2 1. The properties listed in this booklet are typical or average values based on laboratory tests conducted by the manufacturer. Stellite alloys are a group of cobaltchromium superalloys consisting of complex carbides. Cocrw meets or exceeds ams 5894, pwa 1196, mcs 1012 and uns r30016. Recommended for steel mill guide rolls, bearing bushings, tube forming rolls, rotary seal rings, can and barrel seaming rolls and wear pads. Microstructure and tribological properties of cobaltbased. Hastelloy g30 alloy a nickelbase alloy with superior corrosion resistance to commercial phosphoric, sulfuric, nitrichydrochloric, nitrichydrofluoric acids and other complex environments containing highly oxidizing acids.
Talonitestellitedendritic cobalt blade material knife. Certified mechanical properties covers stellite 6b in the form of sheet and plate up to 1 thick and round bar up to 3. Survey on stellite substitutes for hardfacing in nuclear environments. Corrosion materials is a global leader in specialty nickel alloys. The interface area in laser cladding, microstructures and mechanical properties of which determine the structural integrity of the laserdeposited coating, consists of two distinctive zones. Stellite 6 is a cobase wear resistant alloy containing 1% c, 27% cr, 4. Stellite alloys are available in many different grades chemical compositions and several different processes or methods of manufacture. Information provided by kennametal stellite vendors. Adhesive wear is similar to stellite alloy 6, but resistance improves as the load increases. For more information, contact us about our inhouse machine shop capabilities. Hightemperature hardness and wear resistance of stellite. Clean copies of this booklet must be made available to candidates for papers 2 and 3 slp2, hlp2, slp3 and hlp3. Aug 15, 20 the carbides present in the cocrwbased stellite alloys are of chromiumrich m 7 c 3 type.
Chemical compositions wt%, co in balance of stellite alloys 60 table 3 2. This alloy is very popular since it can retain hardness even at elevated temperature. The chemical and phase composition, morphology and microstructure of the coatings were assessed using auger electron spectroscopy, xray diffraction. Stellite alloy is a range of cobaltchromium alloys designed for wear resistance. Content is relevant with a little digression from the main topic which does not look evidently off topic.
Summary of micro hardness test specifications 93 table 42. A comparative study for wear resistant of stellite 6. The wear resistance of alloy 6b is due to the chemical composition and is not a product of heat treatment or other hardening mechanisms. The carbides present in the cocrwbased stellite alloys are of chromiumrich m7c3 type.
Retains mediocre edge for a long time, no point in polishing the edge, better off with coarse edge. There are many types of stellite alloys composed of varying quantities of cobalt, chromium, molybdenum, tungsten, iron, nickel, boron, aluminum, carbon, manganese, phosphorus, silicon, titanium and sulfur in different proportions. Nowadays, many stellite alloys are produced with combinations of. Out of print literary and book themed zipper pouch for book. However, if used for chopping hard wood, the soft cobalt rolls over and the knife does not. Stellite 6b hpa cobalt 6b uns r30016 high performance. While ultimet alloy has been used successfully in the form of wrought products, its largest applications have involved weld overlays, made with solid wire consumables and arcwelding processes such as gmaw mig and gtaw tig. Stellite is a nonmagnetic alloy which contains a variety of different metal components with the main elements being cobalt and chromium. Research article effect of gtaw welding parameters. Dav 04 davis, handbook of thermal spray technology, asm international, 2004. These different processes include casting, powder metal, hardfaced deposit, and wrought. Stellite cobalt base alloys consist of complex carbides in an alloy matrix. Quantities of carbides in stellite alloys 87 table 41.
Stellite 6k is excellent for some uses and is a poor performer for others. Ams 5759 requires minimum yield strength of 45,000 psi at room temperature. Stellite alloys corrosion resistance this alloy is considered inferior to stellite alloys 6 and 12 in most environments. Average hardness values hv of solid solution and carbides 103 table 43. Cobalt alloys give superior hot corrosion resistance to gas turbine atmospheres. Talonite and stellite are really just trade names for different cobalt alloys, ie. The top surface of the clad has been machined separately and then chemical composition of stellite 6 was measured by optical emission spectrometer oes.
Identification of the substancepreparation and of the companyundertaking product identifier product type welding rods, coated rod electrode, welding wire product name stellite 12 rodwireelectrodepart product code ksyc10031 type 1x1x1 mm, base. Some of the main advantages that stellite 6b cobalt chromium alloy provides includes. Figure 2b shows xrd analysis of the coating, phase composition of the coating mainly contains co, cr 7 c 3, co 6 w 6 c, crco. The chemical composition of stellite 6 is given in table 3. Stellite article about stellite by the free dictionary.
The ps, hvof and lc stellite coated all had a similar nominal composition of balance co, 28% cr, 4. A comparative study for wear resistant of stellite 6 coatings. Stellite 6kdeloro stellite not a steel, cobalt based alloy with very high chromium content. Stellite the general name for a group of cobaltbase hard facing alloys containing chromium, tungsten, silicon, and other. They are resistant to wear, gall ing and corrosion and retain these properties at high. It is regarded as the industry standard for generalpurpose wear resistance applications. Oct 10, 20 several studies on laser cladding of stellite 6 show that dendritic structure is rich with cobalt in the form of. Cobalt alloys are used primarily for wear applications and are particularly wellsuited for hardfacing applications. Co, while dark coloured structures are carbides in the form of m 7 c 3 24, 25, m 23 c 6 6, 24 and co 6 w 6 c 6, 24, where m represents cr, co and w. However, if used for chopping hard wood, the soft cobalt rolls over and the knife does not cut well.
This gives them the ability to absorb stress to a higher absolute temperature. Carbon alloy powders similar to stellite, ultimet, mar m oerlikon. Stellite alloy 3 is resistant to nitric acid over a range of concentrations at room temperature. The chromiumrich carbides cr 7 c 3 formed during esd process have stable facecentercubic structure, it makes a contribution to high macrohardness and good abrasive wear resistance of. Average hardness values hv of solid solution and carbides 103 table 4 3.
Stellite is a family of completely nonmagnetic and corrosionresistant cobalt alloys of various compositions that have been optimised for different uses. Haynes 25 l605 is a nonmagnetic cobalt based superalloy. Cobalt alloy 6b stellite 6b ams 5894 aircraft materials. Stellite 6b cobalt alloy steel cobaltchromium alloy. With many yeas production experience, strict control stellite no. Stellite 6b is a cobaltbased steel alloy that maintains a wide range of material benefits for industrial applications throughout the world.
Hpa cobalt 6b is a wear resistant alloy used for stems, balls, rails and bushings. Plasma transferred arc welding of stellite 6 alloy on. A wide variety of stellite 6 powder options are available to you, there are 235 suppliers who sells stellite 6 powder on, mainly located in asia. For wrought grades stellite 6b and stellite 6k, the wrought or hot forging method of production leads to. Alloy 6b uns r30016 ams 5894 description alloy 6b is a cobaltbased alloy with great wear, erosion and abrasion resistance. Cobalt alloy 6b stellite 6b is a cobaltbased, chromiumtungsten alloy used extensively in wear environments where its low friction coefficient minimises the risk of seizing and galling, even in applications where lubrication is not practical. The carbides present in the cocrwbased stellite alloys are of chromiumrich m 7 c 3 type. Stellite is the brand name of a hardfacing alloy which is widely used for valve seats, especially for valves subjected to abrasive service. Stellite 6 welding rods hai stellite 6 rod is cobalt base rod. The dilution region is the region where melted substrate forms a mixture with coating material and possesses microstructure similar to the coating. Cobalt alloys cobalt alloys have higher melting points than nickel or iron alloys. Stood 3 can be manufactured to conform to military specification milc15345f, alloy 22, and milc24248 ships, composition iv.
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