CN101838774A - High speed steel and productive technology thereof - Google Patents
High speed steel and productive technology thereof Download PDFInfo
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- CN101838774A CN101838774A CN 201010171962 CN201010171962A CN101838774A CN 101838774 A CN101838774 A CN 101838774A CN 201010171962 CN201010171962 CN 201010171962 CN 201010171962 A CN201010171962 A CN 201010171962A CN 101838774 A CN101838774 A CN 101838774A
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Abstract
The invention discloses high speed steel and a productive technology thereof. The high speed steel comprises the following chemical components by weight percent: 1.0 to 1.4 percent of C, 3.8 to 4.2 percent of Cr, 4.8 to 5.2 percent of Mo, 6.3 to 6.5 percent of W, 8.2 to 8.4 percent of Co, 2.2 to 3.0 percent of V, 0.4 to 1.5 percent of Nb and 0.2 to 0.4 percent Si, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, less than or equal to 0.4 percent of Mn, and the balance of Fe and inevitable impurities. The invention creatively introduces atomization deposition technology into the high speed steel preparation process, overcomes the defects of coarse crystalline grains and severe segregation of the traditional casted blank, abandons the disadvantages of various work procedures and high energy consumption of powder metallurgy technology, has the advantage of the powder metallurgy technology and consequently improves the various performances of metal material greatly. The advantage of the invention is obvious and outstanding.
Description
Technical field
The invention belongs to rapid steel and production technique thereof in the metallic substance.
Background technology
Rapid steel is a kind of high quality steel that contains volume carbon (C), tungsten (W), molybdenum (Mo), chromium (Cr), vanadium element y such as (V), has high thermohardening after the thermal treatment, when cutting temperature up to more than 600 ℃ the time, hardness does not still have obvious decline, Tool in Cutting speed with its manufacturing can reach per minute more than 60 meters, and its hardness is 63-65HRC.
The manufacture method of rapid steel has two kinds, and one is traditional steel ingot casting, and another kind is then for utilizing the powder metallurgy process manufacturing.Steel ingot casting is divided into secondary refining (EAF+LF+VD) or esr (ESR) two classes usually again, because molten metal slowly cools off, causes the thick of the inhomogeneous segregation of alloy and alloy carbide in the aforesaid method, thereby has influence on the performance of rapid steel.Though the processing of follow-up hotwork can change and the cast structure of refinement steel ingot, lowers detrimentally affect, can't eliminate original cast structure, thereby physics and mechanical properties are had negative influence.For improving the quality of traditional rapid steel, wish that particularly large-diameter high-speed steel carbide particle size can be tiny and be evenly distributed, stop segregation to produce, make laterally and the even indifference of mechanical properties longitudinally.Nineteen sixty-five, this C Compaq of smelting furnace (Crucible) takes the lead in producing the direction-free steel grade of a kind of homogeneous microstructure.Develop so far, the powder metallurgy processing procedure has become the main method of current manufacturing high-performance tool steel.Its cardinal principle is the high-temperature fusion molten steel for preparing alloy ingredient with modulated, in addition high pressure nitrogen atomizing when flowing out, make it be rapidly solidificated into a uniform powder material, then through screening and being filled in the cylindrical steel cylinder that vacuumizes and seal, carry out heat and all press (HIP), make the particle in the steel cylinder become closely knit material fully, directly become the different shapes product again via tradition forging, rolling, as: pole, sheet material, sheet material and wire rod, use for industry member.
Has higher technical requirements owing to produce the powder rapid steel, the manufacturer of whole world powder rapid steel is also few at present, mainly concentrate on the U.S., Europe and Japanese, representative have U.S.'s smelting furnace this primary (Crucible), Europe (ASSAB, Soderfors, Erasteel, Bohler, DSS, Carpenter), Japan (Hitachi, Daido, Nachi, Kobe).But the operation of powder metallurgy is quite complicated, comprising: melting, atomizing, screening, mix batch, processes such as encapsulation, isostatic cool pressing, hot isostatic pressing, forge hot or hot rolling, contact encapsulation, thermal treatment.These operations are carried out in the process, need the dimensional requirement of the investment of apparatus expensive such as hot isostatic pressing and atomisation unit bigger, and the recovery rate of mmaterial are lower, energy utilization rate.
Summary of the invention
The object of the present invention is to provide the better rapid steel of a kind of hardness;
Another purpose of the present invention is the production technique of above-mentioned rapid steel;
The technical scheme of technical solution problem of the present invention is: a kind of rapid steel, and chemical ingredients quality percentage composition is: C 1.0-1.4%, Cr 3.8-4.2%, Mo 4.8-5.2%, W 6.3-6.5%, Co 8.2-8.4%, V 2.2-3.0%, Nb 0.4-1.5%, Si 0.2-0.4%, S≤0.03%, P≤0.03%, Mn≤0.4%, all the other are Fe and unavoidable impurities.
The quality percentage composition of preferred Nb is 0.6～1.2%.
Preferred L n/S 〉=20.
Production technique of the present invention comprises following operation:
A, burden process: the composition according to alloy is prepared burden;
B, melting process: the batching that will mix is put into the vacuum induction furnace internal heating of spray deposition equipment working chamber to being higher than alloy melting point 100-250 ℃, be incubated 10-20 minute, make the composition and the temperature of rapid steel melt in the induction furnace reach uniformity, then the rapid steel melt is poured in the heated tundish according to the speed of 3-10g/min, the temperature of tundish is higher than 100-250 ℃ of rapid steel fusing point;
C, spray deposition operation: indoor in materialization, with pressure 2-3MPa, the N of purity＞99.9%Wt
2Gas is atomized into molten drop to the rapid steel melt by atomizing nozzle, and molten drop flight also is deposited on the depositor that rotates with 50-90 rev/min of speed, forms the columnar deposition base;
D, air cooling operation: it is 50-100mm to the distance of atomizing mouth that the rising depositor makes deposit preform, keep simultaneously deposit preform high speed rotating on the depositor and keep deposit preform and nozzle between distance constant, control deposit preform top surface rate of temperature fall＜10 ℃/min, if it is too fast that temperature reduces, be easy to generate segregation, after the billet surface temperature is lower than 800 ℃, stop temperature control, furnace cooling obtains the rapid steel base substrate;
E, annealing operation: the rapid steel base substrate that reaction-injection moulding is made is heated to 850-880 ℃, the insulation more than 10 hours the back slow cooling to≤600 ℃ of air coolings of coming out of the stove, speed of cooling≤30K/hr;
F, forge hot operation: the good high speed billet heating temperature of will annealing is to 1100-1180 ℃, the min/mm of heat tracing time t=d * (1.0-2.0), and d is the thickness of forging product, the forging ratio of forge hot 〉=9: 1;
G, Q-tempering operation: the rapid steel that forge hot is good is heated to 1180-1200 ℃ of insulation and quenches after 6-10 minute, 550-560 ℃ of insulation tempering after 1 hour, times of tempering 1-4 time.
The effect and the proportioning of the various alloying elements of the present invention are as follows:
Carbon (C): carbon is at the forming element of rapid steel pilot scale carbide, and its content reaches according to alloying element to be decided the requirement of processing performance, use properties, generally between 0.80～1.5%.Carbon is very important alloying element in the rapid steel, and the processing performance and the use properties of rapid steel had crucial influence.Because the adding of strong carbide element nb, formation is difficult to dissolved MC type carbide.By carrying high-carbon content,, improve age hardening effect in drawing process so that the carbide of more V is separated out.But carbon content is too high, and quenching overheating, burning susceptibility and residual austenite are had negative impact, and reduces toughness, so carbon content is 1.0～1.4% among the present invention.
Chromium (Cr): one of forming element of carbide in the rapid steel mainly enters M in the annealed state
23C
6, the secondary hardening of steel is also played an important role, therefore control its content 3.8～4.2%.
Molybdenum (Mo), tungsten (W): the main addition element of rapid steel, main effect be form some amount be difficult to the dissolved primary carbide, make steel can carry out quench hot, and improve the wear resistance of steel near fusing point; Obtain the martensite of high W (Mo) by high temperature solid solution after, M during tempering
2C and MC precipitation form the proeutectoid carbide of sufficient amount, are the principal elements of secondary hardening and red hardness.Among the present invention, Mo is 4.8～5.2% in control, and W content is 6.3～6.5%.
Vanadium (V): the main addition element of rapid steel, V is to the disperse of the MC precipitate of the secondary hardening effect that plays that forms part and the link up conclusive effect that distributed.The content of V forms MC type carbide in the general rapid steel between 1.0～3.0%, improves secondary hardness, red hardness and the wear resistance of steel.The grindability that is higher than at 3.0% o'clock can be poor.Therefore, the content of V is controlled at 2.2～3.0%.
The purposes of rapid steel is depended in the existence of cobalt (Co): Co, and it can improve the red hardness of steel, but reduces the toughness of steel.So the content of Co is controlled at 8.2～8.4% among the present invention.
Niobium (Nb): the strong carbide forming element, form MC type carbide, can be used to part and replace V or W, the content of V is reduced to the level that only keeps secondary hardening.Utilize Nb to increase MC type carbide in the steel, thereby strengthen the wear resistance of steel.But during the too high levels of Nb, then shown the alligatoring to primary grain, the particle of carbide is thicker, and then rapid steel is difficult to grinding.Therefore the content of Nb is controlled at 0.4～1.5%.
Silicon (Si): add as deoxidant element.In low-alloy high-speed steel, generally acknowledged favourable to secondary hardening and hot hardness, but in containing the higher rapid steel of W, Si does not only have benefit to secondary hardening, and owing to promote the formation of thick primary carbide MC, unfavorable to the toughness of steel.Other negative impacts of Si also have: increase the decarburization susceptibility of steel, slightly reduce the temperature of secondary hardening peak value, promote non-coherence M6C carbide to form in higher tempering temperature, and unfavorable to the red hardness more than 600 ℃.Therefore, strictness limits its content 0.20～0.40% among the present invention.
Sulphur (S): meeting shape FeS, come red brittleness to steel band, the content of control S is below 0.030%, and content is low more good more.
Phosphorus (P): P forms microsegregation when solidification of molten steel, be to gather partially at crystal boundary at austenitizing temperature subsequently, and the fragility of steel is enlarged markedly.The content of control P is below 0.030%, and content is low more good more.
Manganese (Mn): as reductor, content is controlled at≤and 0.40%.In addition, Mn/S in the steel 〉=20 are beneficial to the thermoplasticity that improves the high speed forging, rolls, and obviously reduce base material crackle.
Spray deposition also is reaction-injection moulding, and its notion and principle are taught in nineteen sixty-eight by the A.Singer of Britain Swansea university the earliest and at first proposed, and it is a kind of rapid coagulation technology, thereby the tiny metal structure of acquisition that makes of the particle after the atomizing is tiny evenly.
The present invention is incorporated into preparation and contains the niobium powder rapid steel the spray deposition technology is creationary, it had both overcome thick, the segregation important disadvantages of conventional cast blank crystal grain, the deficiency that the operation of having abandoned powder metallurgical technique again is various, energy consumption is higher, have simultaneously the advantage of powder metallurgy technology again concurrently, thereby improved the various performances of metallic substance greatly, its advantage is very remarkable and outstanding.
Production technique of the present invention omitted the screening of powder in the powder metallurgy, mix batch, encapsulation, all multiple operation of static pressure such as hot and cold, do not need expensive facility investment, saved powder rapid steel technology cost.And the rapid steel performance that makes meets or exceeds the powder rapid steel, particularly added alloying elements nb, makes that this rapid steel characteristics are hardness height, has better wear resistance; Be widely used in various cutters, also can be used for making mould etc., reduced the use price of powder rapid steel.
Description of drawings
Accompanying drawing is the metallography microscope photo of the embodiment of the invention 1.
Embodiment
Below in conjunction with embodiment the present invention is described in detail.
Preparation method of the present invention comprises following operation:
Embodiment 1:
A, burden process: the composition according to the described alloy of table 1 is prepared burden;
B, melting process: the batching that will mix is put into the vacuum induction furnace internal heating of spray deposition equipment working chamber to being higher than 100 ℃ of alloy melting points, be incubated 20 minutes, make the composition and the temperature of rapid steel melt in the induction furnace reach uniformity, then the rapid steel melt is poured in the heated tundish according to the speed of 3g/min, the temperature of tundish is higher than 100 ℃ of rapid steel fusing points;
C, spray deposition operation: indoor in materialization, with pressure 2-3MPa, the N of purity＞99.9%Wt
2Gas is atomized into molten drop to the rapid steel melt by atomizing nozzle, and molten drop flight also is deposited on the depositor that rotates with 50 rev/mins of speed, forms the columnar deposition base;
D, air cooling operation: it is 50mm to the distance of atomizing mouth that the rising depositor makes deposit preform, keep simultaneously deposit preform high speed rotating on the depositor and keep deposit preform and nozzle between distance constant, control deposit preform top surface rate of temperature fall＜10 ℃/min, if it is too fast that temperature reduces, be easy to generate segregation, after the billet surface temperature is lower than 800 ℃, stop temperature control, furnace cooling obtains the rapid steel base substrate;
E, annealing operation: the rapid steel base substrate that reaction-injection moulding is made is heated to 850 ℃, is incubated after 10 hours slow cooling to≤600 ℃ of air coolings of coming out of the stove, speed of cooling≤30K/hr;
F, forge hot operation: the good high speed billet heating temperature to 1100 of will annealing ℃, heat tracing time t=d * (1.0) min/mm, d are the thickness of forging product, the forging ratio of forge hot 〉=9: 1;
G, Q-tempering operation: the rapid steel that forge hot is good is heated to 1180-1200 ℃ of insulation and quenches after 6 minutes, 550-560 ℃ of insulation tempering after 1 hour, times of tempering 1 time.
Embodiment 2:
A, burden process: the composition according to the alloy shown in the table 1 is prepared burden;
B, melting process: the batching that will mix is put into the vacuum induction furnace internal heating of spray deposition equipment working chamber to being higher than 130 ℃ of alloy melting points, be incubated 12 minutes, make the composition and the temperature of rapid steel melt in the induction furnace reach uniformity, then the rapid steel melt is poured in the heated tundish according to the speed of 4g/min, the temperature of tundish is higher than 130 ℃ of rapid steel fusing points;
C, spray deposition operation: indoor in materialization, with pressure 2-3MPa, the N of purity＞99.9%Wt
2Gas is atomized into molten drop to the rapid steel melt by atomizing nozzle, and molten drop flight also is deposited on the depositor that rotates with 60 rev/mins of speed, forms the columnar deposition base;
D, air cooling operation: it is 60mm to the distance of atomizing mouth that the rising depositor makes deposit preform, keep simultaneously deposit preform high speed rotating on the depositor and keep deposit preform and nozzle between distance constant, control deposit preform top surface rate of temperature fall＜10 ℃/min, if it is too fast that temperature reduces, be easy to generate segregation, after the billet surface temperature is lower than 800 ℃, stop temperature control, furnace cooling obtains the rapid steel base substrate;
E, annealing operation: the rapid steel base substrate that reaction-injection moulding is made is heated to 850-880 ℃, the insulation more than 10 hours the back slow cooling to≤600 ℃ of air coolings of coming out of the stove, speed of cooling≤30K/hr;
F, forge hot operation: the good high speed billet heating temperature of will annealing is to 1100-1180 ℃, and heat tracing time t=d * (1.2) min/mm, d are the thickness of forging product, the forging ratio of forge hot 〉=9: 1;
G, Q-tempering operation: the rapid steel that forge hot is good is heated to 1180-1200 ℃ of insulation and quenches after 7 minutes, 550-560 ℃ of insulation tempering after 1 hour, times of tempering 2 times.
Embodiment 3:
A, burden process: the composition according to alloy shown in the table 1 is prepared burden;
B, melting process: the batching that will mix is put into the vacuum induction furnace internal heating of spray deposition equipment working chamber to being higher than 160 ℃ of alloy melting points, be incubated 14 minutes, make the composition and the temperature of rapid steel melt in the induction furnace reach uniformity, then the rapid steel melt is poured in the heated tundish according to the speed of 6g/min, the temperature of tundish is higher than 170 ℃ of rapid steel fusing points;
C, spray deposition operation: indoor in materialization, with pressure 2-3MPa, the N of purity＞99.9%Wt
2Gas is atomized into molten drop to the rapid steel melt by atomizing nozzle, and molten drop flight also is deposited on the depositor that rotates with 50-90 rev/min of speed, forms the columnar deposition base;
D, air cooling operation: it is 70mm to the distance of atomizing mouth that the rising depositor makes deposit preform, keep simultaneously deposit preform high speed rotating on the depositor and keep deposit preform and nozzle between distance constant, control deposit preform top surface rate of temperature fall＜10 ℃/min, if it is too fast that temperature reduces, be easy to generate segregation, after the billet surface temperature is lower than 800 ℃, stop temperature control, furnace cooling obtains the rapid steel base substrate;
E, annealing operation: the rapid steel base substrate that reaction-injection moulding is made is heated to 850-880 ℃, the insulation more than 10 hours the back slow cooling to≤600 ℃ of air coolings of coming out of the stove, speed of cooling≤30K/hr;
F, forge hot operation: the good high speed billet heating temperature of will annealing is to 1100-1180 ℃, and heat tracing time t=d * (1.5) min/mm, d are the thickness of forging product, the forging ratio of forge hot 〉=9: 1;
G, Q-tempering operation: the rapid steel that forge hot is good is heated to 1180-1200 ℃ of insulation and quenches after 6-10 minute, 550-560 ℃ of insulation tempering after 1 hour, times of tempering 3 times.
Embodiment 4:
A, burden process: the composition according to alloy shown in the table 1 is prepared burden;
B, melting process: the batching that will mix is put into the vacuum induction furnace internal heating of spray deposition equipment working chamber to being higher than 200 ℃ of alloy melting points, be incubated 18 minutes, make the composition and the temperature of rapid steel melt in the induction furnace reach uniformity, then the rapid steel melt is poured in the heated tundish according to the speed of 8g/min, the temperature of tundish is higher than 210 ℃ of rapid steel fusing points;
C, spray deposition operation: indoor in materialization, with pressure 2-3MPa, the N of purity＞99.9%Wt
2Gas is atomized into molten drop to the rapid steel melt by atomizing nozzle, and molten drop flight also is deposited on the depositor that rotates with 80 rev/mins of speed, forms the columnar deposition base;
D, air cooling operation: it is 80mm to the distance of atomizing mouth that the rising depositor makes deposit preform, keep simultaneously deposit preform high speed rotating on the depositor and keep deposit preform and nozzle between distance constant, control deposit preform top surface rate of temperature fall＜10 ℃/min, if it is too fast that temperature reduces, be easy to generate segregation, after the billet surface temperature is lower than 800 ℃, stop temperature control, furnace cooling obtains the rapid steel base substrate;
E, annealing operation: the rapid steel base substrate that reaction-injection moulding is made is heated to 850-880 ℃, the insulation more than 10 hours the back slow cooling to≤600 ℃ of air coolings of coming out of the stove, speed of cooling≤30K/hr;
F, forge hot operation: the good high speed billet heating temperature of will annealing is to 1100-1180 ℃, and heat tracing time t=d * (1.8) min/mm, d are the thickness of forging product, the forging ratio of forge hot 〉=9: 1;
G, Q-tempering operation: the rapid steel that forge hot is good is heated to 1180-1200 ℃ of insulation and quenches after 8 minutes, 550-560 ℃ of insulation tempering after 1 hour, times of tempering 4 times.
Embodiment 5:
A, burden process: the composition according to alloy shown in the table 1 is prepared burden;
B, melting process: the batching that will mix is put into the vacuum induction furnace internal heating of spray deposition equipment working chamber to being higher than 250 ℃ of alloy melting points, be incubated 10 minutes, make the composition and the temperature of rapid steel melt in the induction furnace reach uniformity, then the rapid steel melt is poured in the heated tundish according to the speed of 10g/min, the temperature of tundish is higher than 250 ℃ of rapid steel fusing points;
C, spray deposition operation: indoor in materialization, with pressure 2-3MPa, the N of purity＞99.9%Wt
2Gas is atomized into molten drop to the rapid steel melt by atomizing nozzle, and molten drop flight also is deposited on the depositor that rotates with 50-90 rev/min of speed, forms the columnar deposition base;
D, air cooling operation: it is 100mm to the distance of atomizing mouth that the rising depositor makes deposit preform, keep simultaneously deposit preform high speed rotating on the depositor and keep deposit preform and nozzle between distance constant, control deposit preform top surface rate of temperature fall＜10 ℃/min, if it is too fast that temperature reduces, be easy to generate segregation, after the billet surface temperature is lower than 800 ℃, stop temperature control, furnace cooling obtains the rapid steel base substrate;
E, annealing operation: the rapid steel base substrate that reaction-injection moulding is made is heated to 850-880 ℃, the insulation more than 10 hours the back slow cooling to≤600 ℃ of air coolings of coming out of the stove, speed of cooling≤30K/hr;
F, forge hot operation: the good high speed billet heating temperature of will annealing is to 1100-1180 ℃, and heat tracing time t=d * (2.0) min/mm, d are the thickness of forging product, the forging ratio of forge hot 〉=9: 1;
G, Q-tempering operation: the rapid steel that forge hot is good is heated to 1180-1200 ℃ of insulation and quenches after 6-10 minute, 550-560 ℃ of insulation tempering after 1 hour, times of tempering 4 times.
The chemical ingredients wt% of table 1, embodiment 1-5
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| ??C | ??1.1 | ??1.2 | ??1.3 | ??1.3 | ??1.4 |
| ??Cr | ??4.0 | ??4.1 | ??4.0 | ??3.9 | ??4.2 |
| ??Mo | ??4.9 | ??5.0 | ??4.9 | ??5.1 | ??4.8 |
| ??W | ??6.4 | ??6.4 | ??6.5 | ??6.5 | ??6.4 |
| ??Co | ??8.4 | ??8.3 | ??8.3 | ??8.2 | ??8.4 |
| ??V | ??2.2 | ??2.4 | ??2.7 | ??3.0 | ??3.0 |
| ??Nb | ??1.5 | ??1.3 | ??1.0 | ??0.8 | ??0.6 |
| ??Si | ??0.3 | ??0.3 | ??0.3 | ??0.3 | ??0.3 |
| ??S | ??0.006 | ??0.007 | ??0.006 | ??0.007 | ??0.007 |
| ??P | ??0.013 | ??0.012 | ??0.010 | ??0.011 | ??0.010 |
| ??Mn | ??0.4 | ??0.4 | ??0.4 | ??0.4 | ??0.4 |
The technical indicator of embodiment 1-5 is as shown in table 2:
Performance and red hardness (600 ℃ * 4 hours) after table 2,1180～1200 ℃ of insulation 13 550～560 ℃ of insulations in the 6 minutes quenching backs tempering in 1 hour
Claims (10)
1. a rapid steel is characterized in that: the quality percentage composition that contains following chemical ingredients: C 1.0-1.4%, Cr 3.8-4.2%, Mo 4.8-5.2%, W 6.3-6.5%, Co 8.2-8.4%, V 2.2-3.0%, Nb 0.4-1.5%, Si 0.2-0.4%, S≤0.03%, P≤0.03%, Mn≤0.4%, all the other are Fe and unavoidable impurities.
2. a kind of rapid steel according to claim 1 is characterized in that: the quality percentage composition of described Nb is 0.6～1.2%.
3. a kind of rapid steel according to claim 1 is characterized in that: described Mn/S 〉=20.
4. the production technique of the described rapid steel of claim 1 is characterized in that: comprise following operation: a, burden process; B, melting process; C, spray deposition operation; D, air cooling operation; E, annealing operation; F, forge hot operation; G, Q-tempering operation.
5. the production technique of rapid steel according to claim 4 is characterized in that:
Described c, spray deposition operation: indoor in materialization, with pressure 2-3MPa, the N of purity＞99.9%Wt
2Gas is atomized into molten drop to the rapid steel melt by atomizing nozzle, and molten drop flight also is deposited on the depositor that rotates with 50-90 rev/min of speed, forms the columnar deposition base.
6. the production technique of rapid steel according to claim 4 is characterized in that:
Described d, air cooling operation: it is 50-100mm to the distance of atomizing mouth that the rising depositor makes deposit preform, keep simultaneously deposit preform high speed rotating on the depositor and keep deposit preform and nozzle between distance constant, control deposit preform top surface rate of temperature fall＜10 ℃/min, if it is too fast that temperature reduces, be easy to generate segregation, after the billet surface temperature is lower than 800 ℃, stop temperature control, furnace cooling obtains the rapid steel base substrate.
7. the production technique of rapid steel according to claim 4 is characterized in that:
Described b, melting process: the batching that will mix is put into the vacuum induction furnace internal heating of spray deposition equipment working chamber to being higher than alloy melting point 100-250 ℃, be incubated 10-20 minute, make the composition and the temperature of rapid steel melt in the induction furnace reach uniformity, then the rapid steel melt is poured in the heated tundish according to the speed of 3-10g/min, the temperature of tundish is higher than 100-250 ℃ of rapid steel fusing point.
8. the production technique of rapid steel according to claim 4 is characterized in that:
Described f, forge hot operation: the good high speed billet heating temperature of will annealing is to 1100-1180 ℃, the min/mm of heat tracing time t=d * (1.0-2.0), and d is the thickness of forging product, the forging ratio of forge hot 〉=9: 1.
9. the production technique of rapid steel according to claim 4 is characterized in that:
Described e, annealing operation: the rapid steel base substrate that reaction-injection moulding is made is heated to 850-880 ℃, the insulation more than 10 hours the back slow cooling to≤600 ℃ of air coolings of coming out of the stove, speed of cooling≤30K/hr.
10. the production technique of rapid steel according to claim 4 is characterized in that:
Described g, Q-tempering operation: the rapid steel that forge hot is good is heated to 1180-1200 ℃ of insulation and quenches after 6-10 minute, 550-560 ℃ of insulation tempering after 1 hour, times of tempering 1-4 time.
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| CN105648343A (en) * | 2016-03-22 | 2016-06-08 | 安徽科凌仪器有限公司 | High-speed steel for high-strength and wear-resistant cutters |
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