CN105274448A - Highly polished pre-hardening plastic die steel and manufacturing process thereof - Google Patents
Highly polished pre-hardening plastic die steel and manufacturing process thereof Download PDFInfo
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Abstract
The invention relates to highly polished pre-hardening plastic die steel and a manufacturing process thereof and belongs to the technical field of alloy steel manufacturing processes. A base body of the highly polished pre-hardening plastic die steel is composed of, by mass, 0.10-0.30% of C, 0.00-0.30% of Si, 0.50-1.50% of Mn, 0.50-1.00% of Cr, 0.20-1.00% of W, 0.40-1.00% of Mo, 0.00-0.10% of V, 0.00-0.025% of P, 0.00-0.005% of S, 0.002-0.005% of B, 0.60-1.50% of Ni, 0.00-0.15% of Nb and the balance Fe. The manufacturing process of the die steel comprises the steps of burdening, smelting, casting, hot charging, high temperature heat diffusion heat treatment, multidirectional forging heat machining, post-forging fine crystalline normalizing and dehydrogenation annealing processing, and final quenching and tempering heat treatment to obtain a tempered martensite structure with the hardness of 38-42 HRC. The die steel has low cost, high hardenability, high hardness, high polishing performance and leather pattern etching performance.
Description
Technical field
The present invention relates to a kind of die steel and manufacturing process thereof, be specifically related to a kind of high polishing pre-hardening plastic mould steel and manufacturing process thereof, this die steel makes full use of the alloying action feature of the many alloying elements of Cr-Mo-W-V-Ni, ensure the uniformity of hardness that steel is higher and polishing performance, be applicable to the mould of plastics manufacturing very high surface requirement, as automobile lamp, rear vision mirror, light fixture, inside gadget, housing of TV set, the electrical parts such as mobile communication, belong to technical field of alloy steel.
Background technology
Along with developing rapidly of China's manufacturing industry, increasing to the consumption of mould, also more and more higher to the performance requriements of moulding stock.All mould is used in the production of automobile industry, household electrical appliances, electronic communication etc.These moulds require to have high polishing performance and processing characteristics, and what use at present is that the material such as Japanese Datong District NAK80 steel or 1.2343 steel is to manufacture these moulds mostly.But NAK80 steel or 1.2343 price of steel product higher, this will increase the manufacturing cost of these automobile products greatly.Be confused under environment at the bottom of global economy particularly since 2012, economizing on resources and reducing costs is a large bottleneck of automobile industry.
The present invention is exactly under so international and domestic environment, and the low cost height polishing pre-hardening plastic mould steel developed, to replace NAK80 steel or 1.2343 die steel of import.The alloying feature of steel grade of the present invention on the basis of 718, reduces carbon and chromium content, improves the content of Mo and add a certain amount of W alloy element.Steel grade of the present invention improves the uniformity of hardness of steel due to lower carbon content, Mo and the W element of high level, and there is higher hardening capacity and hardenability, adding of microalloy Nb can the effectively crystal grain of refinement steel and homogeneity of ingredients, make prevulcanized steel have higher uniformity of hardness, thus obtain higher polishing performance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low cost super-section bayesian height polishing pre-hardening plastic mould steel and manufacturing process thereof.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of high polishing pre-hardening plastic mould steel, its innovative point in: die steel matrix is made up of the component of following mass percent:
C0.10%~0.30%；Si0.00%~0.30%；
Mn0.50%~1.50%；Cr0.50%~1.00%；
W0.20%~1.00%；Mo0.40%~1.00%；
V0.00%~0.10%；P0.00%~0.025%；
S0.00%~0.005%；B0.002%~0.005%；Ni0.60%~1.50%；
Nb0.00% ~ 0.15%; All the other are Fe.
Described one high polishing pre-hardening plastic mould Heat Treatment Of Steel technique has following steps:
Steps A. smelt: by high polishing pre-hardening plastic mould steel matrix forming by following mass percent component: C0.10% ~ 0.30%; Si0.00% ~ 0.30%; Mn0.50% ~ 1.50%; Cr0.50% ~ 1.00%; W0.20% ~ 1.00%; Mo0.40% ~ 1.00%; V0.00% ~ 0.10%; P0.00% ~ 0.025%; S0.00% ~ 0.005%; B0.002% ~ 0.005%; Ni0.60% ~ 1.50%; Nb0.00% ~ 0.15%; All the other are Fe, carry out preparing burden, electric arc furnace smelting and refining, and then carry out vacuum outgas and be cast into steel ingot, then heat send forge furnace;
Step B. High temperature diffusion thermal treatment: by the steel ingot heat after processing of step A, keeps temperature to be 1150 ~ 1250 DEG C, is incubated 10 ~ 20 hours;
Step C. forges hot-work: be cooled to by the steel ingot after step B process in 900 ~ 1200 DEG C of temperature ranges and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=5, final forging temperature >=850 DEG C;
Step D. heat treatment after forging: by the steel ingot air cooling after step C process, then steel ingot dress annealing furnace normalizing treatment, treatment temp 860 DEG C ~ 920 DEG C, is incubated 10 ~ 15 hours, below the air cooling to 300 DEG C of coming out of the stove, advance and retreat stove;
Step e. expand hydrogen annealing: the steel ingot after step D process is incubated 40 ~ 50 hours at the temperature of 550 DEG C ~ 700 DEG C, and stove is cooled to less than 200 DEG C and comes out of the stove;
Step F. Pre-hardening treatment: by the Heating Steel Ingots to 850 after step e process DEG C ~ 950 DEG C, be incubated 15 ~ 30 hours, come out of the stove and be cooled to surface temperature less than 200 DEG C, enter tempering stove;
Step G. tempering heat treatment: by the Heating Steel Ingots to 500 after step F process DEG C ~ 600 DEG C, be incubated 20 ~ 40 hours, stove is cooled to less than 250 DEG C, air cooling of coming out of the stove.
Preferred: described die steel matrix is made up of the component of following mass percent:
C0.20%；
Si0.20%；
Mn1.30%；
Cr0.80%；
Mo0.60%；
W0.50%；
V0.07%；
P0.000%~0.015%；
S0.00%~0.002%；
B0.003%；
Ni1.00%
Nb0.06%；
All the other are Fe.
Preferably, described High temperature diffusion thermal treatment, point stepped heating in steel ingot temperature-rise period, ensures that steel ingot internal and external temperature is even, namely respectively at 600 DEG C, 800 DEG C and 1100 DEG C of isothermals; High temperature diffusion thermal treatment ensure steel interalloy Elemental redistribution evenly, at 900 ~ 1200 DEG C of temperature isothermals after High temperature diffusion thermal treatment, when carrying out conducting forging processing after steel ingot homogeneous temperature.
Preferably, described step F come out of the stove cooling be water-cooled, mist cold or air-cooled in one.
The invention has the advantages that: die steel of the present invention has higher polishing performance and lower cost of alloy, this brings huge contribution for China's manufacturing industry especially automobile industry and household electrical appliances and electronic communication production, and improves China's die steel manufacture level and the market competitiveness.
Accompanying drawing explanation
Fig. 1 is the CCT curve of height polishing pre-hardening plastic mould steel of the present invention.
Fig. 2 is height polishing pre-hardening plastic mould steel tempering characteristics curve of the present invention.
Embodiment
Embodiment 1
A kind of high polishing pre-hardening plastic mould steel matrix is made up of the component of following mass percent: C0.20%; Si0.10%; Mn0.80%; Cr0.80%; W0.60%; Mo0.50%; V0.07%; P0.015%; S0.002%; B0.003%;
Ni1.00%; Nb0.06%; All the other are Fe.
A kind of manufacturing process of high polishing pre-hardening plastic mould steel has following steps:
Steps A. electrosmelting: smelt in electric arc furnace by said components composition, then external refining and vacuum outgas, is cast into steel ingot after heat and send forge furnace;
Step B. High temperature diffusion thermal treatment: by the steel ingot heat after processing of step A, keeps temperature to be 1150 ~ 1250 DEG C, is incubated 15 ~ 20 hours;
Step C. forges hot-work: be cooled to by the steel ingot after step B process in 900 ~ 1200 DEG C of temperature ranges and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=5, final forging temperature >=850 DEG C;
Step D. heat treatment after forging: by the steel ingot air cooling after step C process, then steel ingot dress annealing furnace normalizing treatment, treatment temp 880 DEG C ~ 920 DEG C, is incubated 10 ~ 15 hours, below the air cooling to 200 DEG C of coming out of the stove, advance and retreat stove;
Step e. expand hydrogen annealing: the steel ingot after step D process is incubated 40 ~ 50 hours at the temperature of 600 DEG C ~ 650 DEG C, and stove is cooled to less than 200 DEG C and comes out of the stove;
Step F. Pre-hardening treatment: by the Heating Steel Ingots to 880 after step e process DEG C ~ 920 DEG C, be incubated 20 ~ 30 hours, cooling of coming out of the stove (water-cooled, mist are cold or air-cooled), to surface temperature less than 200 DEG C, enters tempering stove;
Step G. tempering heat treatment: by the Heating Steel Ingots to 540 after step F process DEG C ~ 580 DEG C, be incubated 20 ~ 40 hours, stove is cooled to less than 250 DEG C, air cooling of coming out of the stove.
Embodiment 2
A kind of high polishing pre-hardening plastic mould steel matrix is made up of the component of following mass percent: C0.20%; Si0.20%; Mn1.00%; Cr0.70%; W0.50%; Mo0.70%; V0.06%; P0.010%; S0.002%; B0.005%; Ni0.80%; Nb0.06%; All the other are Fe.
A kind of manufacturing process of high polishing pre-hardening plastic mould steel has following steps:
Steps A. electrosmelting: smelt in electric arc furnace by said components composition, then external refining and vacuum outgas, is cast into steel ingot after heat and send forge furnace;
Step B. High temperature diffusion thermal treatment: by the steel ingot heat after processing of step A, keeps temperature to be 1150 ~ 1250 DEG C, is incubated 15 ~ 20 hours;
Step C. forges hot-work: be cooled to by the steel ingot after step B process in 900 ~ 1200 DEG C of temperature ranges and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=5, final forging temperature >=850 DEG C;
Step D. heat treatment after forging: by the steel ingot air cooling after step C process, then steel ingot dress annealing furnace normalizing treatment, treatment temp 880 DEG C ~ 920 DEG C, is incubated 10 ~ 15 hours, below the air cooling to 200 DEG C of coming out of the stove, advance and retreat stove;
Step e. expand hydrogen annealing: the steel ingot after step D process is incubated 40 ~ 50 hours at the temperature of 600 DEG C ~ 650 DEG C, and stove is cooled to less than 200 DEG C and comes out of the stove;
Step F. Pre-hardening treatment: by the Heating Steel Ingots to 880 after step e process DEG C ~ 920 DEG C, be incubated 20 ~ 30 hours, cooling of coming out of the stove (water-cooled, mist are cold or air-cooled), to surface temperature less than 200 DEG C, enters tempering stove;
Step G. tempering heat treatment: by the Heating Steel Ingots to 540 after step F process DEG C ~ 580 DEG C, be incubated 20 ~ 40 hours, stove is cooled to less than 250 DEG C, air cooling of coming out of the stove.
Embodiment 3
A kind of high polishing pre-hardening plastic mould steel matrix is made up of the component of following mass percent: C0.18%; Si0.18%; Mn1.00%; Cr1.00%; W0.80%; Mo0.50%; V0.05%; P0.020%; S0.003%; B0.004%; Ni1.00%; Nb0.10%; All the other are Fe.
A kind of manufacturing process of high polishing pre-hardening plastic mould steel has following steps:
Steps A. electrosmelting: smelt in electric arc furnace by said components composition, then external refining and vacuum outgas, is cast into steel ingot after heat and send forge furnace;
Step B. High temperature diffusion thermal treatment: by the steel ingot heat after processing of step A, keeps temperature to be 1150 ~ 1250 DEG C, is incubated 15 ~ 20 hours;
Step C. forges hot-work: be cooled to by the steel ingot after step B process in 900 ~ 1200 DEG C of temperature ranges and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=5, final forging temperature >=850 DEG C;
Step D. heat treatment after forging: by the steel ingot air cooling after step C process, then steel ingot dress annealing furnace normalizing treatment, treatment temp 880 DEG C ~ 920 DEG C, is incubated 10 ~ 15 hours, below the air cooling to 200 DEG C of coming out of the stove, advance and retreat stove;
Step e. expand hydrogen annealing: the steel ingot after step D process is incubated 40 ~ 50 hours at the temperature of 600 DEG C ~ 650 DEG C, and stove is cooled to less than 200 DEG C and comes out of the stove;
Step F. Pre-hardening treatment: by the Heating Steel Ingots to 880 after step e process DEG C ~ 920 DEG C, be incubated 20 ~ 30 hours, cooling of coming out of the stove (water-cooled, mist are cold or air-cooled), to surface temperature less than 200 DEG C, enters tempering stove;
Step G. tempering heat treatment: by the Heating Steel Ingots to 540 after step F process DEG C ~ 580 DEG C, be incubated 20 ~ 40 hours, stove is cooled to less than 250 DEG C, air cooling of coming out of the stove.
Height polishing pre-hardening plastic mould steel of the present invention is after above-mentioned smelting and hot-work and thermal treatment, and final finished specification is (the wide * of long * is high) 2500mm*1300mm*550mm module, and performance test is carried out in sampling:
Phase-change characteristic: the CCT curve of steel of the present invention as shown in Figure 1;
Tempering characteristics: steel belt roof bolt rational curve of the present invention as shown in Figure 2.
As seen from the figure, steel grade improves the uniformity of hardness of steel due to lower carbon content, Mo and the W element of high level, and there is higher hardening capacity and hardenability, adding of microalloy Nb can the effectively crystal grain of refinement steel and homogeneity of ingredients, make prevulcanized steel have higher uniformity of hardness, thus obtain higher polishing performance.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. a high polishing pre-hardening plastic mould steel, is characterized in that: die steel matrix is made up of the component of following mass percent:
C0.10%~0.30%；
Si0.00%~0.30%；
Mn0.50%~1.50%；
Cr0.50%~1.00%；
W0.20%~1.00%；
Mo0.40%~1.00%；
V0.00%~0.10%；
P0.00%~0.025%；
S0.00%~0.005%；
B0.002%~0.005%；
Ni0.60%~1.50%；
Nb0.00%~0.15%；
All the other are Fe.
2. one according to claim 1 high polishing pre-hardening plastic mould steel, is characterized in that: described die steel matrix is made up of the component of following mass percent:
C0.20%；
Si0.20%；
Mn1.30%；
Cr0.80%；
Mo0.60%；
W0.50%；
V0.07%；
P0.000%~0.015%；
S0.00%~0.002%；
B0.003%；
Ni1.00%
Nb0.06%；
All the other are Fe.
3. a technique for the high polishing pre-hardening plastic mould steel described in manufacturing claims 1 or 2, is characterized in that: this manufacturing process has following steps:
Steps A. smelt: by high polishing pre-hardening plastic mould steel matrix forming by following mass percent component: C0.10% ~ 0.30%; Si0.00% ~ 0.30%; Mn0.50% ~ 1.50%; Cr0.50% ~ 1.00%; W0.20% ~ 1.00%; Mo0.40% ~ 1.00%; V0.00% ~ 0.10%; P0.00% ~ 0.025%; S0.00% ~ 0.005%; B0.002% ~ 0.005%; Ni0.60% ~ 1.50%; Nb0.00% ~ 0.15%; All the other are Fe, carry out preparing burden, electric arc furnace smelting and refining, and then carry out vacuum outgas and be cast into steel ingot, then heat send forge furnace;
Step B. High temperature diffusion thermal treatment: by the steel ingot heat after processing of step A, keeps temperature to be 1150 ~ 1250 DEG C, is incubated 10 ~ 20 hours;
Step C. forges hot-work: be cooled to by the steel ingot after step B process in 900 ~ 1200 DEG C of temperature ranges and carry out multiway forging processing, adopts two upsettings two to pull out forging mode, forging compression ratio >=3, total forging ratio >=5, final forging temperature >=850 DEG C;
Step D. heat treatment after forging: by the steel ingot air cooling after step C process, then steel ingot dress annealing furnace normalizing treatment, treatment temp 860 DEG C ~ 920 DEG C, is incubated 10 ~ 15 hours, below the air cooling to 300 DEG C of coming out of the stove, advance and retreat stove;
Step e. expand hydrogen annealing: the steel ingot after step D process is incubated 40 ~ 50 hours at the temperature of 550 DEG C ~ 700 DEG C, and stove is cooled to less than 200 DEG C and comes out of the stove;
Step F. Pre-hardening treatment: by the Heating Steel Ingots to 850 after step e process DEG C ~ 950 DEG C, be incubated 15 ~ 30 hours, come out of the stove and be cooled to surface temperature less than 200 DEG C, enter tempering stove;
Step G. tempering heat treatment: by the Heating Steel Ingots to 500 after step F process DEG C ~ 600 DEG C, be incubated 20 ~ 40 hours, stove is cooled to less than 250 DEG C, air cooling of coming out of the stove.
4. the manufacturing process of high polishing pre-hardening plastic mould steel according to claim 3, it is characterized in that: described step B. High temperature diffusion thermal treatment, point stepped heating in steel ingot temperature-rise period, ensures that steel ingot internal and external temperature is even, namely respectively at 600 DEG C, 800 DEG C and 1100 DEG C of isothermals; High temperature diffusion thermal treatment ensure steel interalloy Elemental redistribution evenly, at 900 ~ 1200 DEG C of temperature isothermals after High temperature diffusion thermal treatment, when carrying out conducting forging processing after steel ingot homogeneous temperature.
5. the manufacturing process of high polishing pre-hardening plastic mould steel according to claim 3, is characterized in that: described step F come out of the stove cooling be water-cooled, mist cold or air-cooled in one.
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| CN105950991A (en) * | 2016-05-13 | 2016-09-21 | 如皋市宏茂重型锻压有限公司 | Copper-bearing high-polishing die steel and preparing technology thereof |
| CN106086691A (en) * | 2016-05-13 | 2016-11-09 | 如皋市宏茂重型锻压有限公司 | A kind of boron micro-alloyed mould steel and preparation technology thereof |
| CN107557688A (en) * | 2017-09-15 | 2018-01-09 | 张家港市广大机械锻造有限公司 | A kind of high toughness cold working die steel |
| CN107587081A (en) * | 2017-09-15 | 2018-01-16 | 张家港市广大机械锻造有限公司 | A kind of high polishing pre-hardening mould steel and its preparation technology |
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| CN107557688A (en) * | 2017-09-15 | 2018-01-09 | 张家港市广大机械锻造有限公司 | A kind of high toughness cold working die steel |
| CN107587081A (en) * | 2017-09-15 | 2018-01-16 | 张家港市广大机械锻造有限公司 | A kind of high polishing pre-hardening mould steel and its preparation technology |
| CN107974623A (en) * | 2017-12-22 | 2018-05-01 | 浙江天基重工机械有限公司 | A kind of plastic die steel and preparation method thereof |
| CN109898019B (en) * | 2019-02-26 | 2020-08-28 | 唐山志威科技有限公司 | Preparation process of large-section high-hardness ZW872 die steel |
| CN109898019A (en) * | 2019-02-26 | 2019-06-18 | 唐山志威科技有限公司 | Big section, high rigidity ZW872 mould steel preparation process |
| CN110016619A (en) * | 2019-05-28 | 2019-07-16 | 营口市特殊钢锻造有限责任公司 | A kind of mining High Strength Wear-Resistance Material and preparation method thereof |
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| CN111876672A (en) * | 2020-07-02 | 2020-11-03 | 如皋市宏茂铸钢有限公司 | High-performance die steel and preparation method thereof |
| CN111826592A (en) * | 2020-07-27 | 2020-10-27 | 中国兵器工业第五九研究所 | High-temperature ablation-resistant low-carbon medium-low alloy steel and preparation method thereof |
| CN111826592B (en) * | 2020-07-27 | 2021-11-02 | 中国兵器工业第五九研究所 | High-temperature ablation-resistant low-carbon medium-low alloy steel and preparation method thereof |
| CN114107624A (en) * | 2020-08-26 | 2022-03-01 | 中国科学院金属研究所 | Heat treatment method for thick and large-section 718H pre-hardened plastic die steel |
| CN113355599A (en) * | 2021-05-24 | 2021-09-07 | 如皋市宏茂重型锻压有限公司 | High-polishing pre-hardened plastic mold steel and manufacturing process thereof |
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