CN104152916A - Thermal treatment and plasma nitrocarburizing surface treatment process method for special wear-resistant die steel with ultrahigh heat conductivity for hot stamping - Google Patents
Thermal treatment and plasma nitrocarburizing surface treatment process method for special wear-resistant die steel with ultrahigh heat conductivity for hot stamping Download PDFInfo
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Abstract
The invention relates to a thermal treatment and plasma nitrocarburizing surface treatment process method for special wear-resistant die steel (HDCM) with ultrahigh heat conductivity for hot stamping a high strength steel plate/tube. The thermal treatment process comprises the following steps: quenching at 1050 DEG C-1000 DEG C and annealing twice at 560 DEG C-600 DEG C; the conditions of the surface treatment process are as follows: the voltage is 600V-850V, the atmosphere ratio is NH3:CO2=10: 1 to 16:1, the furnace pressure is 450Pa-700Pa, the nitriding temperature is 520 DEG C-550 DEG C, and the nitriding time is 8 hours-12 hours. In the aspect of overall performance, the performances of the special hot stamping die steel are as follows: the hardness is 51HRC-53HRC, and the notched bar impact strength Ak is about 170J-200J. After surface plasma nitridation, a compound layer is formed on the surface of the die. The white bright layer is 6mu m-17mu m thick, the Vickers Microhardness is 750HV300-750HV300, and the nitriding layer is 150mu m-260mu m. The hardness value of the die steel provided by the invention is higher than H13 in common thermal treatment, so that the wear resistance of the die can be improved, galling of the surface of the die can be effectively prevented, and the service life of the die can be greatly prolonged by virtue of plasma surface nitridation.
Description
Technical field
The present invention relates to the special-purpose excessive heat conductance wear-resistant mould Heat Treatment Of Steel of a kind of High Strength Steel Plate/pipe hot stamping and plasma carbonitriding surface treatment process method, be applied to steel alloy thermal treatment and technical field of surface.
Background technology
Conventionally by mould, use object that die steel is divided into cold-work die steel, hot-work die steel and plastic die steel three major types.Hot stamping die steel belongs to hot-work die steel.Along with the high speed development of automobile industry, and the improving constantly of automotive light weight technology demand, hot press-formed technique is mainly used in obtaining superstrength stamping parts.When obtaining ultrahigh-strength steel, the plastic force required due to cold punching forming process is very big, easily causes that mould damages, equipment vibrations, and also easily produces the problem such as break, wrinkling, bounce-back, dimensional precision are bad.Therefore, the needs that no longer meet technology and production development of original cold punching forming process, and hot press-formed technology utilization metal is under the condition of high temperature, and its plasticity and ductility increase sharply, and yield strength declines rapidly.Hot stamping die steel be nearly decades usage quantity sharply rise and consume one of maximum die steel, its working condition is also more complicated than general hot-work die steel.
Steel hot stamping process is to austenitic temperature scope by special high strength steel board heating, move quickly into mould, punching press fast, under press packing state, by being furnished with the mould (rather than air) of cooling loop, part is carried out to quench cooled (and will guarantee certain speed of cooling), finally obtain superstrength stamping parts (be organized as martensite, intensity is even higher in 1500MPa left and right).When work, because mould directly contacts with the blank of heating, when red-hot metal is put into hot stamping die die cavity, mold cavity surface steep temperature rise, and top layer produces stress and compressive strain when punching press and pressurize, this makes mould need good heat resistance and thermostability; In pressure maintaining period, by the mould with cooling water channel, component are quenched, in order to make mould can be soon the mould precision in process under arms be taken away and be guaranteed to the heat of steel plate, moulding stock must have larger thermal conductivity and less thermal expansivity; When metalwork takes out, mold cavity surface is because reduces heat is subject to tensile stress and stretching strain effect, at the operating mode bed die of this checker temperature, very easily produces thermal fatigue; And hot stamping die steel in process, also will be subject to greater impact load, so mould need possess good toughness under arms; For the plucking that prevents that die surface from producing in process under arms, mould also needs to have higher hardness.In addition, because steel plate after austenitizing is transferred to contact with oxygen G&W mould internal procedure and is produced a large amount of oxide skin in stove, the carbide particles that come off in mould use procedure etc. produce wearing and tearing in mould and workpiece relative movement process, require mould to have good wear resisting property.Therefore, complicated working condition requirement hot stamping die material has higher thermal conductivity, hot strength, hardness, impelling strength, wear resistance, hardening capacity and thermostability and cold-and-heat resistent fatigue property etc.
At present, China the hot stamping die steel of long use adopts is that in standard GB/T/T1299-2000, grade of steel is that 4Cr5MoSiV1(is equivalent to North America standard H13 steel).The chemical composition of this hot stamping die steel adopts C 0.32-0.45wt%, Cr 4.75-5.50wt%, Mo 1.20-1.75 wt%, V 0.80-1.20 wt%, Si 0.80-1.2wt%, Mn 0.20-0.5wt%, P≤0.03wt%, S≤0.03wt%.At present, what Japanese enterprises adopted is that hot-work die steel SKD61(is equivalent to North America standard H13 steel), that Sweden hot stamping die supplier adopts is ORVAR, what Germany Enterprises adopted is CR7V and 1.2379.
Thermal treatment has vital impact to the use properties of die steel.Thermal treatment has determined die steel internal microstructure, thereby has determined the obdurability of die steel.By different thermal treatment, can make mould obtain required hardness, but its tissue, performance may have marked difference, give full play to the tough effect of die steel alloying element, the different die steel of different purposes just must have corresponding thermal treatment process.It is fine that the tempering temperature of plasma surface nitriding temperature and hot-work die steel is coincide, and compares with other surface treatments, and it is a kind of proven technique, and cost is low, reliability is high.By atmosphere, nitriding temperature, the time can well control surface compound layer and the phase composite of diffusion layer and its performance.By simple nitriding, process, can greatly improve the work-ing life of mould, there is very high cost performance.
A kind of High Strength Steel Plate/pipe hot stamping excessive heat conductance wear-resistant mould steel HDCM has invented in Shanghai University, and its chemical element weight percentage is: C:0.33-0.40%; Si:< 0.30%; Mn: ﹤ 0.30%; W:1.0-2.0%; Mo:4.0-5.0%; Cr:< 0.30%; V:0.10-0.20%; All the other are Fe and inevitable impurity element, S in impurity element :≤0.01%; P :≤0.02%; O :≤30ppm.。In addition, this invention also provides a kind of manufacture method of hot stamping die steel, and it adopts electroslag remelting process, high-temperature homogenization and micronization heat treatment process to control material structure, thereby plays the strengthening effect to material, improves its performance index.Than current material, the thermal conductivity coefficient of the hot stamping die steel that this invention is described has improved more than 80% compared with H13 steel in 100-200 ℃ of interval, and has good wear resisting property.
china and foreign countries' patent retrieval content analysis to correlation technique
By inputting the keyword of relevant content of the present invention, China and foreign countries' patent is being retrieved to discovery, relating to the hot-work die steel thermal treatment that is associated with the present invention and the patent documentation of process for treating surface thereof has:
1) number of patent application: CN201210146712.5, title: the high manganese type of high silicon high thermal stability hot-work die steel and thermal treatment process thereof, it is constant that this steel is characterised in that in chemical composition that the element silicon of high-content and the ratio of manganese element remain 1:1, the mass percent of each main alloy element is: C0.25～0.45%, Si0.8～2.0%, Mn0.8～2.0%, Cr3.5～4.5%, Mo0.6～1.2%, V0.4～0.8%, P < 0.02%, S < 0.02%, Fe surplus.The preparation process of hot-work die steel of the present invention is as follows: batching, smelting, pouring, then esr; The thermal treatment of high temperature homogeneity, then multiway forging hot-work; Carrying out ultrafining heat-treatment and isothermal annealing processes again; Finally quench and tempering heat treatment, be heated to 980～1100 ℃ and carry out austenitizing, through oil cooling or water smoke cooling after, at 540 ℃～600 ℃, carry out two to three tempering.
2) number of patent application: CN201210139562.5, title: the thermal treatment process of automobile mould for forging steel H13, it is characterized in that, comprise following processing step: (1) packs die steel into process furnace, 300 ℃ of the temperature < of process furnace, be warming up to 760 ~ 780 ℃, pass into methyl alcohol as protective atmosphere, the intake of protective atmosphere is: 3 ~ 5 * stove volume/hour; (2) first process furnace is continued to be warming up to 820 ~ 850 ℃ and carry out first stage thermal treatment, be heat-up time: die steel length * 1.2 ~ 1.8min; Process furnace is warming up to 1020 ~ 1050 ℃ again and carries out subordinate phase thermal treatment, be heat-up time: die steel length * 1.5 ~ 2.2min; (3) quench cooled: die steel is carried out in the quenching nitrate furnace of 160 ~ 180 ℃ cooling, be 1.5 ~ 2.5 hours cooling time; Then die steel goes out nitrate furnace and in air, naturally cools to 120 ~ 160 ℃, and be 1.5 ~ 2.5 hours cooling time; (4) temper: the die steel after quench cooled is carried out to temper at 530 ~ 600 ℃, and soaking time is 5 ~ 9 hours naturally cools to room temperature in air after temper; (5) operation 2 ~ 3 times of repeating step (4), completes the heat treatment process of described die steel; The unit of described die steel length is millimeter.
3) number of patent application: CN200710039838.1 disclosure of the invention a kind of nitriding method of oriented silicon steel, principal character is included in that plasma nitriding is indoor carries out plasma nitriding processing, by controlling 500～700 ℃ of nitriding temperatures, the nitriding time 10～30 seconds in plasma nitriding chamber, nitriding atmosphere is that H2 accounts for 0～10%, NH3 accounts for 0～5%, all the other are N2, controlling plasma nitriding chamber vacuum tightness is 1000～2000Pa, polar plate voltage is 700～1000V, controls the size of the infiltration capacity, distribution and the nitride that infiltrate the N element in oriented silicon steel.In oriented silicon steel is produced, adopt plasma nitriding method can make nitriding effect even, strengthen the restraint of inhibitor, improve technology stability.
4) the surface modification treatment working method of number of patent application: a CN200410017949.9 valve precision forging die, the main nitridation process that adopts, the method is characterized in that and there is the valve precision forging die that following technological process and step: a. adopts former hot-work die steel making, after the tempering of quenching, put into special-purpose plasma heat treatment equipment, pass into and take ammonia as main nitrogen containing atmosphere, and the plasma nitriding carrying out in 500-550 ℃ of temperature range 2-8 hour is processed; When b. plasma nitriding finishes, then pass into ammonia and acetone gas mixture, the plasma carbonitriding carrying out at above-mentioned 500-550 ℃ temperature 1-3 hour is processed, and the volume ratio of ammonia and acetone gas is 10: 1～5: 1; C. and then put into steam oxidation stove, under the vapor pressure of 0.05～0.25MPa, mould is carried out to surface oxidation treatment in 500-550 ℃ of temperature range.D. after above-mentioned recombining process is processed, make die surface be uniform pewter, and mould surface structure forms three layers, top layer is oxide film, and thickness is 3～10 μ m; The second level top layer is nitrogen, carbon diffusion layer, and thickness is 100～400 μ m, and the 3rd layer is matrix heart portion, below inferior top layer, is the matrix of hot-work die steel.
the comparative analysis of the present invention and prior art
Comparative analysis is as follows: from the contrast of composition, can find out, the constituent content of Chemical Composition of the present invention and patent 1-2 are obviously different, and element is also just different to the mechanism of the performance effect of material, and the applied environment of material is also different.
1) patent CN201210146712.5 and similarity of the present invention have been to adopt and have quenched and the technique of twice of tempering, obtain stable tempered martensite.The present invention, by controlling the parameters such as plasma nitriding atmosphere ratio, nitriding time, furnace pressure, voltage, nitriding temperature, obtains without compound layer nitrided case.When improving die surface hardness, optimize mould solidity to corrosion, wear resistance and anti-adhesion property.Obtain from surface with common plasma nitriding that heart portion is followed successively by compound layer, diffusion layer technique is compared, the resulting fragility of having avoided compound layer without compound layer infiltration layer of the present invention, improved the thermal fatigue property of mould, the compound layer fragmentation of avoiding comes off, and to be conducive to mould wear-resistant for the hard abrasive that produces.
2) patent CN201210139562.5 is the H13 steel thermal treatment for automobile forging die, is its quenching mode with difference of the present invention, and its die steel carries out cooling in the quenching nitrate furnace of 160 ~ 180 ℃, and be 1.5 ~ 2.5 hours cooling time; Then die steel goes out nitrate furnace and in air, naturally cools to 120 ~ 160 ℃, and be 1.5 ~ 2.5 hours cooling time; The present invention is vacuum air-quenching.Compared with patent CN201210139562.5, the present invention at 560-600 ℃ according to this cun of tempering different time of mould.This research adopts high-pressure gas quenching furnace, and the type of cooling is that air cooling is to room temperature.And after thermal treatment, by plasma nitriding technique, further improve the work-ing life of mould.
3) patent CN201210099323.1 is a kind of nitriding method of oriented silicon steel.By adopting plasma nitriding method can make nitriding effect even in oriented silicon steel is produced, strengthen the restraint of inhibitor, improve technology stability.And the present invention is different processing on material and nitrogen-carbon cocementing process.This patent is studied in hot stamping with improving its mould wear resisting property by plasma carbonitriding on moulding stock HDCM.
4) patent CN200410017949.9 is a kind of surface modification treatment working method of valve precision forging die, adopts nitriding+oxidizing process.Adopt the valve precision forging die of former hot-work die steel making, after the tempering of quenching, put into special-purpose plasma heat treatment equipment and carry out plasma nitriding processing; When plasma nitriding finishes, then pass into ammonia and the processing of acetone gas mixture plasma carbonitriding, and then put into steam oxidation stove mould is carried out to surface oxidation treatment.After art breading, mould surface structure forms three layers, and top layer is oxide film, and thickness is 3～10 μ m; The second level top layer is nitrogen, carbon diffusion layer, and thickness is 100～400 μ m, and the 3rd layer is the base matrix that is hot-work die steel.And this patent designs a kind of Novel hot press tool material and its plasma nitrogen-carbon cocementing process, wherein nitrogen-carbon cocementing process and patent CN200410017949.9 are in temperature, the process parameter for nitridings such as atmosphere are different, it is also different that the surface structure obtaining is organized, the present invention finally obtains is organized as top layer compound bright layer 6-17 μ m, and hardness is 750-850HV
300; Sublevel is diffusion layer, about 150-260 μ m; The 3rd layer is moulding stock matrix.
relevant mechanism of the present invention and select the analysis interpretation of processing parameter
Below the analysis interpretation to each parameter of the present invention:
1. quenching temperature 1050-1000 ℃: this hot stamping particular manufacturing craft steel is hypereutectoid steel, and when quenching temperature is lower, tempering rear mold hardness is too low; When quenching temperature is higher, Austenite Grain Growth causes that the strength of materials declines, toughness is poor.Final selective quenching temperature 1050-1100 ℃, obtains the tough proportioning of die steel of applicable heat stamping and shaping after tempering.
2. tempering temperature 560-600 ℃: after quenching, this die steel austenite carbon content once added, remaining certain Ovshinsky scale of construction after quenching, this part residual austenite is decomposed into martensite through a tempering, causes poor impact toughness.Therefore, the present invention adopts 560-580-600 ℃ of tempering to reach stabilizing tissue and the object of adjusting hardness for 3 times.Final die steel hardness is 51-53HRC, and 7mm * 10mm * 55mm non-notch ballistic work is 170-200J.
3. plasma carbonitriding voltage 600-850V: voltage main nitriding process that waits in plasma nitriding has larger promoter action, this can improve bombarding energy high voltage, thereby increase nitriding depth and Li Gao nitrided case hardness, and overtension can hinder gas ions in the adhering to and spread of matrix surface, so voltage should be chosen suitable scope.
4. plasma carbonitriding atmosphere ratio NH3:CO2=10:1-16:1: can regulate the thickness of compound layer and diffusion layer phase to form and thickness by changing NH3:CO2 ratio.Therefore according to different needs, carry out the adjustment of atmosphere ratio.
5. plasma carbonitriding furnace pressure 450-750Pa: ion-nitriding furnace furnace pressure is higher, aura is concentrated; When furnace pressure is low, aura is dispersed.In actually operating, furnace pressure can regulate within the scope of 133-1066Pa.Under high pressure, the long α phase content of compound layer is high, and low furnace pressure easily obtains γ phase.Lower than 40Pa or ionitriding under higher than the condition of 2660Pa, be not prone to compound layer.
6. plasma carbonitriding temperature 520-550 ℃: ionitriding compound layer and diffusion layer temperature increase and significantly increase with temperature, but the weave construction to compound layer does not have much affect, and, even under the low temperature of 400 ℃, also have obvious nitriding effect, this is also the outstanding feature of ionitriding.There is a maximum value in surface hardness, temperature too low within the specific limits, and hardened layer is too shallow, and strengthening effect is not good enough; Temperature is too high, and the nitride alligatoring in infiltration layer causes hardness to decline.
7. plasma carbonitriding time 8h-12h: nitriding has different rules to the impact of α phase and γ phase compound layer thickness.While being less than 4h, γ phase compound layer thickness extends in time and thickens, and substantially remain unchanged, and α phase compound layer thickness continues to increase along with nitriding time extends after 4h.In the ordinary course of things, the prolongation of nitriding time always makes compound layer thickness increase.And the diffusion layer degree of depth and compound parabolic relation between the time, its Changing Pattern is similar to gas nitriding.Nitriding atmosphere one timing in stove in addition, the not thin nitriding time impact of the nitrogen concentration of compound layer.Along with nitriding time extends, diffusion layer is deepened, and hardness gradient tends towards stability; But soaking time increases, cause that nitride organizes coarse language, cause hardness to decline.
Compared with prior art, the present invention has the following advantages:
The present invention relates to a kind of High Strength Steel Plate, pipe hot stamping particular manufacturing craft Heat Treatment Of Steel and surface treatment process method thereof.In thermal treatment process, the feature of steel of the present invention is that thermal treatment temp and time are strictly limited, and obtains the mould state of applicable heat stamping and shaping.In surface treatment, by multifactor compound control, obtain good firm nitride layer and the diffusion layer of the required anti-wear energy of hot stamping die.In over-all properties, this special hot press tool rigidity can be: through 1080 ℃ of quenchings, after 560-600 ℃ of 3 tempering, hardness is 51-53HRC, and notched bar impact strength Ak is 170-200 J; After surface plasma nitriding, die surface compound layer thickness is 6-17 μ m, micro-vickers hardness 750-850HV
300, alloying layer thickness 150-260 μ m.Die steel hardness value of the present invention is higher than general thermal treatment H13, can improve the wear resisting property of mould, can effectively prevent the plucking of die surface, more can greatly extend the work-ing life of mould after plasma surface nitriding.Mould after wearing and tearing, can come into operation with plasma nitriding of the present invention again through repairing a die, thereby improves widely the terminal life of mould.
Summary of the invention
The object of this invention is to provide the special-purpose excessive heat conductance wear-resistant mould material heat treatment of a kind of High Strength Steel Plate/pipe hot stamping and plasma carbonitriding process for treating surface.Its object is to make hot stamping die steel to obtain by thermal treatment the tough proportioning that most suitable hot stamping is produced, and effectively improves die surface intensity through surface treatment, strengthens wear resistance, solidity to corrosion, anti-caking and the thermal fatigue resistance of mould.Mould after wearing and tearing, through repair and again plasma nitriding can again come into operation, thereby improve widely the terminal life of mould.Its content comprises:
A. the special-purpose excessive heat conductance of High Strength Steel Plate/pipe hot stamping wear-resistant mould steel heat treatment process is as follows: adopt high-pressure gas quenching furnace 1050-1000 ℃ of quenching, 560-600 ℃ of tempering three times, after processing, this special hot press tool rigidity can be: matrix hardness is 51-53HRC, and notched bar impact strength Ak is 170-200J;
B. the special-purpose excessive heat conductance of High Strength Steel Plate/pipe hot stamping wear-resistant mould steel surface plasma nitrogen-carbon cocementing process is as follows: treatment process voltage is 600-850V, atmosphere ratio NH3:CO2=10:1-16:1, furnace pressure 450-700Pa, 520 ℃-550 ℃ of nitriding temperatures, nitriding time 8h-12h.After surface plasma nitriding, die surface forms compound infiltration layer, bright layer thickness 6-17 μ m, micro-vickers hardness 750-850HV
0.3, alloying layer thickness 150-260 μ m.
Accompanying drawing explanation
Fig. 1 is microstructure optics and the SEM photo of embodiment 1 this thermal treatment process die steel;
Fig. 2 is embodiment 1 thermal treatment and plasma carbonitriding rear mold steel cross section metallographic structure photo;
Fig. 3 is embodiment 2 thermal treatments and plasma carbonitriding rear mold steel cross section metallographic structure photo;
Fig. 4 is embodiment 3 thermal treatments and plasma carbonitriding rear mold steel cross section metallographic structure photo;
Fig. 5 is embodiment 3 thermal treatments and plasma carbonitriding rear mold steel surface XRD material phase analysis;
Fig. 6 is embodiment 3 thermal treatments and plasma carbonitriding rear mold steel section hardness gradient.
Embodiment
Now specific embodiments of the invention are described in down by reference to the accompanying drawings.
embodiment 1
The present invention relates to a kind of High Strength Steel Plate, the special-purpose excessive heat conductance wear-resistant mould Heat Treatment Of Steel of pipe hot stamping and process of surface treatment thereof, under concrete technology:
1. moulding stock chemical composition: C:0.36%; Si:0.07%; Mn:0.14%; W:1.70%; Mo:4.51%;
Cr：0.12%；V：0.14%；
2. thermal treatment process: 1080 ℃ of quenchings, 560 ℃, 580 ℃, 600 ℃ tempering 2h, under this heat treatment condition, hardness and impelling strength: hardness value is 51-53HRC, notched bar impact strength is 170-200 J.The tempering state of quenching microstructure as shown in Figure 1.
3. plasma nitriding technique: voltage 600-650V, atmosphere ratio NH
3: CO2=10:1, furnace pressure 450-500Pa, 520 ℃ of nitriding temperatures, nitriding time 8h.Nitriding rear surface hardness is 760-800HV
0.3, compound layer thickness 6-9 μ m.Carbonitriding sample section structure picture as shown in Figure 2.
embodiment 2
The present invention relates to a kind of High Strength Steel Plate, the special-purpose excessive heat conductance wear-resistant mould Heat Treatment Of Steel of pipe hot stamping and process of surface treatment thereof, under concrete technology:
1. moulding stock chemical composition: C:0.38 %; Si:0.06%; Mn:0.12%; W:1.65 %; Mo:4.43%;
Cr：0.12%；V：0.13%；
2. thermal treatment process: 1080 ℃ of quenchings, 560 ℃, 580 ℃, 600 ℃ tempering 2h, under this heat treatment condition, hardness and impelling strength: hardness value is 51-53HRC, notched bar impact strength is 170-200 J.
3. plasma nitriding technique: voltage 800-850V, atmosphere ratio NH
3: CO2=16:1, furnace pressure 450-500Pa, 550 ℃ of nitriding temperatures, nitriding time 8h.Nitriding rear surface hardness is 800-840HV
300, compound layer thickness 11-15 μ m.Carbonitriding sample section structure picture as shown in Figure 3.
embodiment 3
The present embodiment has carried out the special-purpose excessive heat conductance of a kind of hot stamping wear-resistant mould steel heat-treats and surface treatment, under concrete technology:
1. moulding stock chemical composition: C:0.37 %; Si:0.08%; Mn:0.12%; W:1.65 %; Mo:4.43%; Cr:0.20%; V:0.12%;
2. thermal treatment process: 1080 ℃ of quenchings, 560 ℃, 580 ℃, 600 ℃ tempering 2h, under this heat treatment condition, hardness and impelling strength: hardness value is 51-53HRC, notched bar impact strength is 170-200 J.
3. plasma nitriding technique: voltage 800-850V, atmosphere ratio NH
3: CO2=10:1, furnace pressure 650-750Pa, 550 ℃ of nitriding temperatures, nitriding time 12h.Nitriding rear surface hardness is 820-850HV
300, compound layer thickness 12-17 μ m.Carbonitriding sample section structure picture as shown in Figure 4; Fig. 5 is embodiment 3 top layer image X-ray diffraction analysis.Fig. 6 is the section hardness gradient of embodiment 3 samples.
Claims (1)
1. the special-purpose excessive heat conductance wear-resistant mould Heat Treatment Of Steel of High Strength Steel Plate/pipe hot stamping and a plasma carbonitriding surface treatment process method, is characterized in that having following process and step:
A. the special-purpose excessive heat conductance of High Strength Steel Plate/pipe hot stamping wear-resistant mould steel heat treatment process is as follows: adopt high-pressure gas quenching furnace 1050-1000 ℃ of quenching, 560-600 ℃ of tempering three times; After processing, this special hot press tool rigidity can be: matrix hardness is 51-53HRC, and notched bar impact strength Ak is 170-200J;
B. the special-purpose excessive heat conductance of High Strength Steel Plate/pipe hot stamping wear-resistant mould steel surface plasma nitrogen-carbon cocementing process is as follows: treatment process voltage is 600-850V, atmosphere ratio NH3:CO2=10:1-16:1, furnace pressure 450-700Pa, 520 ℃-550 ℃ of nitriding temperatures, nitriding time 8h-12h; After surface plasma nitriding, die surface forms compound infiltration layer, bright layer thickness 6-17 μ m, micro-vickers hardness 750-850HV
0.3, alloying layer thickness 150-260 μ m.
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| CN113122683A (en) * | 2021-04-19 | 2021-07-16 | 江阴大手印精密材料科技发展有限公司 | High-wear-resistance alloy steel for linear guide rail and preparation method thereof |
| CN114427091A (en) * | 2020-10-14 | 2022-05-03 | 无锡朗贤轻量化科技股份有限公司 | High-wear-resistance die steel product for hot stamping and additive manufacturing process thereof |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
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| CN109906278A (en) * | 2016-10-31 | 2019-06-18 | 新日铁住金株式会社 | The manufacturing method and steel part of steel part |
| CN108385056A (en) * | 2018-04-09 | 2018-08-10 | 湖南特科能热处理有限公司 | A kind of heat treatment method of engine fuel oil system atomizer |
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| CN114427091A (en) * | 2020-10-14 | 2022-05-03 | 无锡朗贤轻量化科技股份有限公司 | High-wear-resistance die steel product for hot stamping and additive manufacturing process thereof |
| CN114427091B (en) * | 2020-10-14 | 2024-03-26 | 无锡朗贤轻量化科技股份有限公司 | High-wear-resistance die steel product for hot stamping and additive manufacturing process thereof |
| CN112921325A (en) * | 2020-12-25 | 2021-06-08 | 苏州奥维精密机械有限公司 | High-stability die steel surface composite double-treatment process |
| CN113122683A (en) * | 2021-04-19 | 2021-07-16 | 江阴大手印精密材料科技发展有限公司 | High-wear-resistance alloy steel for linear guide rail and preparation method thereof |
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