High-speed steel material

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High-speed steel is one kind contains larger carbon (C) , tungsten (W) , molybdenum (Mo) , chromic (Cr) , vanadium (the tall alloy steel of the element such as V) , high fever rigid is had after heat treatment. When cutting temperature is as high as 600 ℃ above, hardness still is not had drop apparently, the rate of cutting tool cutting that produces with its can be amounted to minutely 60 meters of above, and get its name. High-speed steel can be divided by chemical composition reach high-powered high-speed steel for common high-speed steel, can divide by workmanship for fusion high-speed steel and pulverous metallurgy high-speed steel. Common high-speed steel pursues 1: High-speed steel is production appearance the main material of the cutting tool of difficulty of complex, grinding. Common high-speed steel can satisfy general requirement. Common common high-speed steel has two kinds, tungsten fastens high-speed steel and tungsten department high-speed steel. Tungsten fastens name of high-speed steel type to be W18Cr4V, heat treatment hardness can amount to 63-66HRC, bending strength can amount to 3500MPa, grindability is good. Tungsten fastens name of high-speed steel type to be W6Mo5Cr4V2, replacing tungsten to fasten high-speed steel at present, have carbide petty distributing even, wearability is tall, cost is low a series of advantages. Heat treatment hardness is Alexandrine, bending strength amounts to 4700MPa, tenacity and thermoplastic rise than W18Cr4V 50% . Commonly used at making all sorts of tools, for example cutting tool of broach, tap, milling cutter, reamer, broach, gear, can satisfy the requirement that processes average project data. The decarbonization sensitivity that is it only is a bit strong. The common high-speed steel of another brand is W9Mo3Cr4V, this is China develops the new breed that rise in last few years. Intensity and thermoplastic W6Mo5Cr4V2 of summary prep above, hardness is HRC63-64, close suitably with tenacity, easy rolling, forging, range of heat treatment craft is wide, decarbonization sensitivity is small, cost is lower. The common high-speed steel of these 3 brands is respectively in the scale of Chinese market: W18Cr4V, 16.

5% ; W6Mo5Cr4V2, 69%;W9Mo3Cr4V, 11% . High-powered high-speed steel has high-powered high-speed steel better hardness and hot rigid, this is the chemical composition through changing high-speed steel, improve performance and develop the new breed that rise. It has taller hardness, hot rigid, cutting temperature is amounted to centigrade 650 degrees when, hardness still can maintain in 60HRC above. 1 what durable sex is common high-speed steel.

5-3 times, apply to the cutting tool of the difficult treatment material such as alloy of alloy of production treatment high temperature, stainless steel, titanium, high strenth steel. Main breed has 4 kinds, fastening high-speed steel, Gao Fan for tall carbon respectively is high-speed steel of high-speed steel, the department that contain cobalt and aluminous high-speed steel. Tall carbon fastens high-speed steel brand to be 9w18Cr4V, because contain carbon the volume is high (0.

9%) , reason hardness, wearability and hot rigid are better. The cutting tool that makes with its is when the difficult treatment material such as alloy of cutting stainless steel, heat-resisting, life rises significantly, but its bending strength is 3000MPa, concussion tenacity is inferior, requirement of heat treatment craft is strict. Gao Fan fastens high-speed steel brand to have W12Cr4V4Mo and M3) of brand of W6Mo5Cr4V3(United States, the quantity that contain vanadium amounts to 3-4% , make wearability rises greatly, but what bring subsequently is grindability becomes poor. Gao Fan is high-speed steel use the development that reachs development to still need to rely on grinding craft and emery wheel technology. Brand of cobaltic high-speed steel has M42) of brand of W2Mo9Cr4VCo8(United States. Its characteristic is: The volume that contain vanadium is not high (1%) , the volume that contain cobalt is high (8%) , cobalt can make carbide be in quench when heating, dissolve morely inside matrix, use tall matrix hardness to raise wearability. Hardness of this kind of high-speed steel, hot rigid, wearability and grindability are very good. Heat treatment hardness can amount to 67-70HRC, but also have adopt method of special heat treatment, get 67-68HRC hardness, make its cutting function (especially discontinuous cutting) get ameliorative, raise concussion tenacity. Cobaltic high-speed steel can make all sorts of cutting tool, it is difficult to be used at cutting treatment material effect is very good, good because of its grinding function, can make complex cutting tool, use very generally on international. But lack of Chinese cobaltic resource, price of cobaltic high-speed steel is high, the 5-8 that is common high-speed steel about times. Brand of aluminous high-speed steel is W6Mo5Cr4V2Al, W6Mo5Cr4V5SiNbAl to wait, basically join aluminium (Al) and silicon (Si) , niobium (Nb) element, will raise hot rigid, wearability. Suit Chinese resource situation, the value is inferior. Heat treatment hardness can achieve 68HRC, hot rigid is pretty good also. But easy oxidation of this kind of steel and decarbonization, plasticity, grindability is a bit poor, still need to improve. High-powered high-speed steel makes dosage has exceeded 25-30% of common high-speed steel on the international market. Note: According to normally international standard, contain cobaltic quantity to just call high-powered high-speed steel in the high-speed steel of 2% above only, code name is HSS-E. Other is like aluminous high-speed steel to wait, although performance is more average,high-speed steel rises somewhat, but have not evidence indicates the coequal performance that can achieve cobaltic high-speed steel. Pulverous metallurgy high-speed steel pursues 2: Pulverous metallurgy high-speed steel reachs its goods. In last few years of high-speed steel most revolution developed pulverous metallurgy high-speed steel namely, its can excel fusion high-speed steel. Be enraged with high-pressured argon or molten steel of high speed of nitrogen pulverization melt, receive powder of petty high-speed steel, after choosing, be 0.

The grain under 4mm; In vacuum (0.

Below 04Hg) condition, airtight agglomeration achieves density 65% ; Make density below high pressure of 1100 ℃ high temperature, 300MPa again the billet of 100% , next forge make friends becomes rolled steel, solved fusion high-speed steel effectively to want to produce bulky carbide to slant when ingot casting the problem of analyse, and no matter it is sectional how old, its carbide level all is one class. Carbide grain is extremely fine, be less than 0.

002mm, and grain of carbide of fusion high-speed steel is 0.

008-0.

02mm. The brand is the pulverous metallurgy high-speed steel of CPM T15, its intensity, tenacity is the fusion high-speed steel that is the same as chemical composition respectively 2 times reach 2.

5 times. Although contain vanadium quantity to amount to 5% , but because carbide grain is fine, grindability still very good. Tall tepid hardness also rises than fusion high-speed steel 0.

5-1HRC. As a result of isotropy of height of function of its physics machinery, quench be out of shape small. The surface that carbide grain distributings equably is bigger, flake not easily from the cutting blade of cutting tool, wearability of small size cutting tool rises 1.

5-2 times, large size cutting tool raises 20-30% . Pulverous metallurgy high-speed steel has good mechanical performance, suit to make: The cutting tool of easy collapse blade below discontinuous cutting condition, intensity is high and cutting blade must sharp cutting tool, if insert tine knife, hob, milling cutter, high pressure uses the cutting tool that uses below load. Its carbide slants analyse is small, grain is fine, grindability is good, suit to make: Large size cutting tool, accurate cutting tool, complex cutting tool. The tall tepid hardness of this kind of material is tall, suit to make the cutting tool that place of difficult treatment stuff uses again, it is reach every aspect of a matter really. Process of production of pulverous metallurgy high-speed steel is more complex, cost is higher. The variety that Chinese steelworks offers is less, market dosage is very few also. Famous steelworks is like American Crucible company on international already can supply high-speed steel of nearly 20 kinds of pulverous metallurgy, japanese Kobe makes steel place, Rilijin belong to a company to all can supply high-speed steel of nearly 10 kinds of pulverous metallurgy, supply also is in rapid growth. Japan's well-known OSG company made broach, milling cutter, tap with pulverous metallurgy high-speed steel, NACHI company made the hob, knife that insert tine, shave tine knife. The pulverous metallurgy high-speed steel that reason believes specifications is tall will receive wider application, for the metal treatment industry brings new development. The market fixed position of high-speed steel and development trend pursue 3: High-speed steel material can be divided by workmanship for fusion high-speed steel and pulverous metallurgy high-speed steel. Since high-speed steel discovers at the beginning of 20 centuries, to modern industry development had main effect. Can say to do not have high-speed steel, process trade without contemporary metal. Although 60 time rise, the material such as hard alloy rises abruptly, but the cutting tool of difficulty of complex to making appearance, grinding, wait like the knife of tine of broach, shave, knife that insert tine, high-speed steel is in dominant position from beginning to end. When asking cutting tool has tall tenacity especially, not belonged to with respect to blame high-speed steel. The main application domain of high-speed steel is machinery and tool manufacturing industry, want to get used to the development of this industry necessarily, in last few years the numerical control machine tool that machining used high rate, for example center of machining center, turning, metallic cutting rate is rapidder and rapidder, requirement cutting tool must have high speed performance characteristics, heat up tenacity of rigid, wearability, concussion to be close friends namely, accordingly, manufacturer in succession the high-speed steel material that research and development accords with afore-mentioned requirements. In machine treatment charge, material occupies 15-20% about, cutting tool occupies 25-35% about. The user is right of cutting tool choose also more and more incline to is reasonable, choose function and price to compare good cutting tool namely. High-speed steel cutting tool takes the field of dominant position, if the market of nice spare parts, complex part, form cutting spare parts is bigger and bigger also, taller and taller also to the requirement of grindability. High-speed steel - the steel that has taken a century is planted, should aim at specific market space, raise oneself technology content, go contending the challenge of other material. The brand of hardness HRC China below ℃ of MJ/m² 600 of tenacity of concussion of MPa of bending strength of HRC of hardness of temper by dipping in water of brand of high-speed steel of list of performance of material of Chinese commonly used high-speed steel, temper is used to W18Cr4V T1 HS18-0-1 62-65 3430 0 of brand of name likeness ISO.

29 50.

5W6Mo5Cr4V2 M2 HS6-5-2 63-66 3500-4000 0.

30-0.

40 47-48 W9Mo3Cr4V 64-66 4000-4500 0.

35-0.

40W6Mo5Cr4V3 M3 HS6-5-3 65-67 3200 0.

25 51.

7W6Mo5Cr4V2Co5 HS6-5-2-5 65-66 3000 0.

30 54 W10Mo4Cr4V3Co10 HS10-4-3-10 67-69 2350 55.

5W2Mo9Cr4V2Co8 HS2-9-2-8 66-68 2700-3800 0.

23-0.

35 55 W7Mo4Cr4V2Co5 M41 HS7-4-2-5 66-68 2500-3000 0.

23-0.

35 54 W12Cr4VCo5 HS12-0-1-5 66-68 3000 0.

66-69 3000-4100 0 of steel of 25 54 W6Mo5Cr4V2Al 501.

25-0.

30 55-56 110W1.

5Mo9.

5Cr4VCo8 M42 67-69 2650-3730 0.

23-0.

29 55.

268-69 3010 0 of W10Mo4Cr4VAl 5F6 steel.

20 54.

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