Tungsten-cobalt Alloy Wear-resistant Roller Nail PM Sintered Parts

Product Introduction

Stellite is a cobalt (Co)-based superalloy that comes in two main combinations: (a) the tungsten (W) group consisting of Co-cr-W-c. (b) Molybdenum (Mo) groups containing Co-Cr-Mo-C. Tungsten-cobalt alloy wear-resistant roller nail PM sintered parts have excellent corrosion resistance, oxidation resistance, wear resistance, heat resistance, and low magnetic permeability. Components made of stellite work well in highly corrosive environments and maintain these superior properties at elevated temperatures. Components made of stellite are widely used in the oil and gas automotive, nuclear power, paper and pulp, chemical and petrochemical, refinery, automotive, aerospace, and aviation industries. Due to its non-magnetic, anti-corrosion, and non-reactive to body fluids. Stellite alloys are used in medical surgery, surgical tools, dental and bone implants and replacements, heart valves, and pacemakers. Stellite has a hardness ranging from 32 to 55 HRC and is a brittle material, but its Young modulus is low. Machining operations on stellite parts are extremely difficult due to their high hardness, and high density but inhomogeneous: molecular structure and low thermal conductivity, stellite is classified as difficult to machine like titanium alloy s material. Inconel, composites, and stainless steel Typically, machine components made of stellite are produced by a deposition method on a steel substrate rather than from expensive solid stellite rods. The rough surface of deposited stellite is achieved by grinding rather than some other economical machining process which is expensive and time-consuming, making stellite products very expensive. This article outlines the basic situation of stellite for engineering, the significance and specific application of stellite, as well as the advantages and disadvantages of processing technology. This paper briefly reviews experimental studies of economically reasonable cutting parameters for cutting stellite alloys with coated carbide inserts. This paper reveals and analyzes an interesting phenomenon of residual stress during the machining of Stellite alloys. The micro-convexity variation of stellite-chrome-cobalt alloy machined surface under different geometric shapes was studied. The results showed that the coated carbide inserts at medium nose radii performed better in terms of hardness change and heat generation, producing minimal phase transformation or cutting surface stellite.

Industrial Applications of Stellite Alloys The rationale for using stellite in the engineering industry is to provide a corrosion and wear-resistant surface which will help in combating the wear and corrosion of mechanical parts. However, wear-resistant materials are characterized by uniform distribution. A dense carbide matrix is naturally difficult to machine due to its high carbide content. In some cases the distribution of cemented carbide is uneven. Lower thermal conductivity and higher hardness lead to poor machinability of these materials.

Cobalt-based alloys are sometimes non-magnetic materials but have high strength. Known for their high wear, corrosion, and heat resistance properties, these alloys are hard yet sufficiently ductile materials. These alloys retain their strength well for long periods of time, even at elevated temperatures, and perform well in corrosive and acidic environments. As mentioned earlier, cobalt-based alloys exhibit excellent resistance to degradation in body fluid environments, which enables their successful application in medical procedures and surgical implants. Several medical tests have confirmed that cobalt-based alloys are biocompatible for use as surgical implants and bone replacements. According to the routine of its application, it can be divided into the following categories:

• Wear-resistant alloys

• Superalloy

• Corrosion Resistant Alloys

Stellite (Stellite 6B) and Stellite (Stellite 6K) are wear-resistant alloys with a high proportion (about 30%) of Cr and about 65% of Co. A high proportion of Cr is the main carbide-forming agent in the solidification process of the alloy, which has high strength. The excellent wear resistance of these alloys is attributed to the most uniform cobalt-rich matrix of carbide grains formed. Due to its excellent wear resistance and toughness, stellite 6 has been widely used in the manufacture of cutting bits for deep drilling equipment such as mining and rock. Crushing rolls, cement and steel equipment, conveyor systems, steam turbine erosion shields, half casings, and bushings that cannot or cannot be lubricated effectively. Stellite 6k. There is no molybdenum (Mo) in its composition, only 30% of Cr, and it has a high hardness (47 HRC). Is highly suitable for production for cutting soft organic and plant materials such as tobacco.

Another alloy, Stellite 3, has 3 times more tungsten (W) than Stellite 6, 6B, and 6K, contains no molybdenum, and is not as good in corrosive environments as Stellite 6, 6B, and 6K, so it is not Recommended for use in this situation. But due to the higher carbon (C) content and increased volume fraction of carbides, Stellite 3 has 3 to 4 times the wear resistance of Stellite 6 and twice that of Stellite 12. Stellite 3 has higher red hardness and resistance to corrosion and wear like all stellite alloys. Therefore, Stellite 3 is recommended for the manufacture of bearing balls and needles, sleeves and bushings, valve seat inserts in non-corrosive environments, scissors inserts, burner nozzles, steel mill guide rolls, and sealing rolls.

Metal Injection Molding Process

Detection Systems