cobalt-based alloys and welding consumables (marketing department of Shanghai HY Industry Co., Ltd)
Introduction of cobalt-based alloys :
Cobalt-based alloys usually refer to Co-Cr alloys, and there are two basic grades: one is Co-Cr-Mo alloy, which is generally processed by casting; the other is Co-Ni-Cr-Mo alloy, which is generally processed by hot forging. processing. The castable alloy Co-Cr-Mo has been used in dentistry for decades and in recent years for artificial joints. Forged Co-Ni-Cr-Mo alloy is a new material used to manufacture the backbone of joint replacement prosthesis connectors, such as knee and hip replacement prostheses.
Types of Cobalt-Based Alloys: The American Society for Testing and Materials lists four cobalt-based alloys that are recommended for use in surgical implants: 1. Cast Co-Cr-Mo alloys. 2. Forging Co-Cr-W-Ni alloy. 3. Forging Co-Ni-Cr-Mo alloy. 4. Forging Co-Ni-Cr-Mo-W-Fe alloy.
Heat resistance of cobalt-based alloys is better than that of various heat-resistant steels, and the thermal stability and corrosion resistance in the atmosphere and various strong corrosive media are relatively good; due to the large amount of carbides, it has strong wear resistance. Especially because of its extremely small friction coefficient, it has good anti-seizure ability when working without lubricant. In the aviation industry, it is mainly used as a force-bearing part working at high temperature such as gas turbine blades and flame tubes. .Used as wear-resistant and high-strength parts in chemical and food machinery.
Cobalt-based cast alloys are a natural extension of those of iron-based alloys in terms of wear and heat resistance. Cobalt-based alloys far exceed nickel-based alloys in wear resistance, but at a certain temperature or under continuous service conditions, their Heat resistance also showed great advantages. In addition, cobalt-based alloys were also found to have excellent corrosion resistance in various media.
Selective recommendations for cobalt-based alloys electrodes:
Cobalt-based welding rod has excellent comprehensive heat resistance, corrosion resistance and oxidation resistance, and can maintain high hardness at high temperatures above 600 degrees. Commonly used cobalt-based alloy surfacing welding is EDCoCr-A, EDCoCr-B, EDCoCr -C, three types, when the deposited metal of cobalt-based alloy electrode contains 25-33% chromium, it has oxidation resistance, and when it contains 3.0-14% tungsten, it has high temperature strength, and cobalt-based alloy itself has corrosion resistance, belongs to The solid solution matrix, carbon is an element, which can improve the strength of the deposited metal. When carbon and chromium are combined into hard carbides, the hardness of the deposited metal can be increased, and with the increase of carbon content, the molten metal will increase. The hardness of the deposited metal increases and the toughness decreases to meet the needs of different purposes. The deposited metal with lower carbon content has good toughness and can withstand the impact of cold and hot conditions, as well as corrosion and erosion conditions, and is suitable for high temperature and high pressure. The surfacing welding of valve sealing surface, pump shaft, hot forging die, hot shearing machine blade, etc., high carbon and high tungsten surfacing welding material has high hardness, good wear resistance, but weak impact resistance, and is not easy to process, commonly used in dental Surfacing welding of wheel bits, bearings, rotating impellers, pulverizer blades, Chinese feeders and other components.
Grades and uses of cobalt-based electrodes:
D802 cobalt-based electrode (EDCoCr-A-03) is used for occasions where good wear resistance and corrosion resistance can still be maintained at about 650 ° C, or parts that are subjected to impact and alternating hot and cold, such as surfacing welding of high temperature and high pressure valves and Hot scissor blades, etc.
D812 cobalt-based electrode (EDCoCr-B-03) is used for high temperature and high pressure valves, shaft sleeves and inner bushings of high pressure pumps, and cutting edges of chemical fiber equipment.
D822 cobalt-based electrode (EDCoCr-C-03) is used for surfacing welding of wear parts such as roller cone bit bearings, rotary impellers of boilers, pulverizer edges, and screw feeders.
D842 cobalt-based electrode (EDCoCr-D-03) is used for surfacing welding of workpieces subjected to impact and alternating hot and cold under high temperature conditions, such as hot forging dies, valve sealing surfaces, etc., with good performance.
D852 cobalt-based electrode (EDCoCr-E-04) is used for high-temperature wear-resistant surfacing electrodes, with a working temperature of 1100 ℃, with red hardness and strong resistance. It can also be used in high temperature, high pressure valve hot section molds, etc. Corrosion-resistant parts.
D862 cobalt-based electrode (EDCoCr-E-05) is suitable for high-temperature abrasive wear and fine-particle small-angle erosion wear conditions. Single-layer surfacing can meet the performance requirements, the maximum working temperature is 1000℃, the hardness of the surfacing layer: 20℃–HRC: 64-66, working temperature 600℃–HRC: 48-52, working temperature 800℃–HRC : 38-42 Typical application fields, working conditions and parts, mechanical equipment with high temperature wear in the fields of iron making, coking, burning, cement and so on.
Co101 cobalt-based electrode is used for high normal temperature hardness, strong wear-resistant particle wear and corrosion resistance. For rotating seal rings, cone bearings, sleeves, drill bits, etc.
Co104 cobalt-based electrode is used for high wear resistance, excellent high temperature strength and corrosion resistance. Used for copper, aluminum alloy hot pressing dies, hot extrusion dies, dry battery dies, etc.
Co106 cobalt-based electrode Stellite cobalt-based No. 6 electrode is used for engine valves, high temperature and high pressure valve sealing surfaces, hot scissor blades, turbine blades, etc.
Co112 Cobalt-Based Electrode Stellite Cobalt-Based No. 12 Electrode is used for high temperature, high pressure valves, shear blades, serrations, screw push rods, etc.
Co120 cobalt-based electrode is used for high pressure valve seat, wear cotton plate.
Cobalt-based No. 1 electrode (GB/T EDCoCr-C-03) is used for surfacing welding of wear parts such as roller cone bit bearings, rotary impellers of boilers, pulverizer edges, and screw feeders.
Cobalt-based No. 4 electrode (GB/TEDCoCr-D-03) is used for surfacing welding of workpieces subjected to impact and alternating hot and cold under high temperature conditions, such as hot forging dies, valve sealing surfaces, etc., and has good performance.
Cobalt-based No. 6 electrode (GB/T EDCoCr-A-03) is used for occasions where good wear resistance and corrosion resistance can still be maintained at about 650 ° C, or parts that are subjected to impact and alternating hot and cold, such as surfacing welding High temperature and high pressure valves and hot scissor blades, etc.
Cobalt-based No. 12 electrode (GB/T EDCoCr-B-03) is used for high temperature and high pressure valves, shaft sleeves and inner bushings of high pressure pumps, and cutting edges of chemical fiber equipment.
Stellite6B alloy has excellent resistance to friction, cavitation, mortar abrasion and thermal wear. The alloy also has good corrosion properties. Even at a hot red temperature of 480°C, it still has quite good hardness, strength and wear resistance.
Cobalt-based alloy grades：Stellite3 Stellite4 Stellite6 Stellite6B Stellite12 Stellite19 Stellite21 Stellite23 Stellite25 Stellite31 AlloyCo212 AlloyCo222 AlloyCo310 AlloyCo400 AlloyCo452 Haynes25(L-605) R30605 Haynes188(R30188) S-816(R30816) MP-35N(R30035) AR-213,MP-159
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