CN104532154A - High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof - Google Patents

High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof Download PDF

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Publication number
CN104532154A
CN104532154A CN201410711833.9A CN201410711833A CN104532154A CN 104532154 A CN104532154 A CN 104532154A CN 201410711833 A CN201410711833 A CN 201410711833A CN 104532154 A CN104532154 A CN 104532154A
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plastic mould
stove
mould steel
steel
hardening plastic
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CN201410711833.9A
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Chinese (zh)
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CN104532154B (en
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周青春
徐卫明
吴晓春
顾金才
钱强
王小飞
丁勇
刘鑫
杨怡祖
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如皋市宏茂重型锻压有限公司
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium

Abstract

The invention relates to a high-hardness high-polishing pre-hardening plastic die steel and a manufacture technology thereof, which belongs to the technical field of alloy steel manufacture technology. The steel is characterized in that the alloy chemical component comprises the following alloy elements by mass percentages: 0.25-0.40% of C, 0.10-0.30% of Si, 1.50-2.00% of Mn, 1.50-2.50% of Cr, 0.50-1.00% of Mo, 0.10-0.30% of V, less than or equal to 0.025% of P, less than or equal to 0.005% of S, 0.60-1.50% of Ni, less than or equal to 0.15% of Nb, and the balance of Fe. The manufacture method comprises the following steps: burdening, smelting, pouring, performing hot delivery; performing high-temperature diffusing heat treatment, then performing multi-directional forging and hot processing, normalizing on fine grains and dehydrogenizing and annealing; and finally quenching and performing temper heat treatment to obtain the tempered structure with hardness of 38-42HRC. The steel of the invention has the advantages of low cost, high hardenability, high hardness, high polishing performance and dermatoglyph etching performance.

Description

High rigidity height polishing pre-hardening plastic mould steel and preparation technology thereof

Technical field

The present invention relates to a kind of plastic mould steel, especially relate to a kind of high rigidity height polishing pre-hardening plastic mould steel, also relate to the preparation technology of this plastic mould steel of preparation, 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.In automobile industry, the production of automobile lamp, rear vision mirror, panel board, inside gadget etc. all uses mould.These moulds require to have high polishing performance and processing characteristics, and what use at present is that H11 steel is to manufacture these moulds mostly.But H11 price of steel product is 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.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of high rigidity height polishing pre-hardening plastic mould steel.

For solving the problems of the technologies described above, the concrete technical scheme that high rigidity height polishing pre-hardening plastic mould steel of the present invention adopts is:

A kind of high rigidity height polishing pre-hardening plastic mould steel, its innovative point is: in the chemical composition of described plastic mould steel, the mass percent of each main alloy element is:

C 0.25~0.40%, Si 0.10~0.30%,

Mn 1.50~2.00%, Cr 1.50~2.50%,

Mo 0.50~1.00%, V 0.10~0.30%,

Ni 0.60~1.50%, Nb ≤0.15%,

P ≤0.025%, S ≤0.005%

Fe surplus.

On this basis, the mass percent of each main alloy element in described plastic mould steel is:

C 0.26%, Si 0.20%, Mn 1.70%, Cr 1.8%,

Mo 0.60%, V 0.20%, Ni 1.0%, P≤0.015%, S≤0.002%, Nb 0.06%, Fe surplus.

Another technical problem that the present invention will solve is to provide a kind of method of producing this high rigidity height polishing pre-hardening plastic mould steel.

For solving the problems of the technologies described above, the concrete technical scheme that the preparation technology of high rigidity height polishing pre-hardening plastic mould steel of the present invention takes is as follows:

A preparation technology for high rigidity height polishing pre-hardening plastic mould steel, its innovative point is: described preparation technology has following steps:

A. smelt: undertaken preparing burden by the chemical composition of high rigidity height polishing pre-hardening plastic mould steel and mass percent, electric arc furnace smelting and refining, then carry out vacuum outgas and casting, then heat send forge furnace;

B. High temperature diffusion thermal treatment: Heating temperature is 1100 ~ 1200 DEG C, soaking time is 15 ~ 20h;

C. forge hot-work: 900 ~ 1200 DEG C will be cooled to through the heat treated steel ingot of High temperature diffusion, in this temperature range, carry out multiway forging processing, adopt two upsettings two to pull out forging mode, always forge compression ratio >=3, final forging temperature >=850 DEG C;

D. heat treatment after forging: air cooling after forging, then fill normalizing furnace normalizing treatment, Heating temperature 880 ~ 950 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;

E. hydrogen annealing is expanded: 600 ~ 700 DEG C of temperature range inside holding 40 ~ 50 hours, stove was chilled to less than 200 DEG C and comes out of the stove;

F. Pre-hardening treatment: be heated to 850 ~ 950 DEG C insulation 20 ~ 30 hours, water-cooled of coming out of the stove or mist cold or air-cooled to surface temperature less than 200 DEG C, enter tempering stove;

G. tempering heat treatment: be heated to 500 ~ 600 DEG C, insulation 20-40 hour, stove is chilled to less than 250 DEG C, air cooling of coming out of the stove.

On this basis, in described High temperature diffusion heat treatment step, heat up and adopt stepped heating mode.

Beneficial effect of the present invention: high rigidity height polishing pre-hardening plastic mould steel of the present invention improves the content of Mo and adds microalloy element Nb.Due to the Mo 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, makes prevulcanized steel have higher uniformity of hardness, thus obtains higher polishing performance.

In conjunction with above feature, compared with H11, steel grade of the present invention has higher polishing performance and lower cost of alloy, this be China's manufacturing industry especially automobile industry bring huge contribution, and improve China's die steel manufacture level and the market competitiveness.

Accompanying drawing explanation

Figure 1 shows that the CCT curve figure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 1.

Figure 2 shows that the high rigidity height polishing pre-hardening plastic mould steel belt roof bolt rational curve of embodiment 1.

Figure 3 shows that the metallographic structure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 1.

Figure 4 shows that the CCT curve figure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 2.

Figure 5 shows that the high rigidity height polishing pre-hardening plastic mould steel belt roof bolt rational curve of embodiment 2.

Figure 6 shows that the metallographic structure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 2.

Figure 7 shows that the CCT curve figure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 3.

Figure 8 shows that the high rigidity height polishing pre-hardening plastic mould steel belt roof bolt rational curve of embodiment 3.

Figure 9 shows that the metallographic structure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 3.

Figure 10 shows that the CCT curve figure of H11 steel.

Figure 11 shows that H11 steel belt roof bolt rational curve.

Figure 12 shows that the metallographic structure of H11 steel.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearly understand, the following specific embodiment of the present invention is described further technical scheme of the present invention, but the invention is not restricted to following specific embodiment.

embodiment 1

In the present embodiment, moiety and the mass percent thereof of the employing of high rigidity height polishing pre-hardening plastic mould steel are as follows:

C 0.40%, Si 0.30%, Mn 2.00%, Cr 2.50%,

Mo 1.00%, V 0.30%, P 0.025%, S 0.005%,

Ni 1.5%, Nb 0.15%, Fe surplus.

Adopt the material in this embodiment to carry out the technological process of production high rigidity height polishing pre-hardening plastic mould steel and step as follows:

1. smelt: prepare burden by the alloying element proportioning in embodiment, batching is sent to electric arc furnace to carry out smelting and refining, then adopt vacuum outgas to remove dissolved gases in liquid metal, prevent defect, finally be cast into steel ingot, then heat send forge furnace; Heat is adopted to send exactly in order to reach the object of energy-saving and emission-reduction.

2. High temperature diffusion thermal treatment: steel ingot classification in forge furnace is heated up, namely 1100 ~ 1200 DEG C are finally heated at 600 DEG C, 800 DEG C, 1100 DEG C isothermals respectively, insulation 15 ~ 20h, soly can guarantee that steel ingot internal and external temperature is even, in order to enable steel ingot eliminate dendritic segregation as much as possible, soaking time is 20h.

3. forge hot-work: 900 ~ 1200 DEG C will be cooled to through the heat treated steel ingot of High temperature diffusion, in this temperature range, carry out multiway forging processing, and adopt two upsettings two to pull out forging mode, always forge compression ratio >=3, final forging temperature >=850 DEG C;

4. heat treatment after forging: air cooling after forging, then fills normalizing furnace and carries out normalizing treatment, Heating temperature 880 ~ 950 DEG C, be incubated 10 ~ 15 hours by steel ingot, below the air cooling to 200 DEG C of coming out of the stove, and advance and retreat stove; In order to make complete austenitizing in steel ingot, obtaining good mechanical property, Heating temperature being selected 930 DEG C, and soaking time is 15h.

5. expand hydrogen annealing: 600 ~ 700 DEG C of insulations 40 ~ 50 hours, stove was chilled to less than 200 DEG C and comes out of the stove; In order to make the hydrogen be solid-solution in steel spread elimination completely, avoid occurring white point class hydrogen embrittlement in tissue, the soaking time in this step selects 50 hours.

6. Pre-hardening treatment: be heated to 850 ~ 950 DEG C insulation 20 ~ 30 hours, water-cooled of coming out of the stove or mist cold or air-cooled to surface temperature less than 200 DEG C, enter tempering stove; In order to make, in this step, steel is quenched to martensite, select soaking time to be 30 hours, meanwhile, comparatively large by steel ingot internal stress after water-cooled, easy strain cracking, during air cooling, speed of cooling is comparatively slow, so this step selects mist cold.

7. tempering heat treatment: be heated to 500 ~ 600 DEG C, be incubated 20 ~ 40 hours, stove is chilled to less than 250 DEG C, to come out of the stove air cooling, in order to the sufficient tempering of steel ingot can be made, produce tempered sorbite, eliminate internal stress, prevent workpiece deformation or cracking, in this step, soaking time selects 30 hours.

High rigidity height polishing pre-hardening plastic mould steel in the present embodiment is after above-mentioned smelting and hot-work and thermal treatment, and final finished specification is (the wide * of long * is thick) 2500mm*1300mm*500mm module, and performance test is carried out in sampling, and test result is:

A phase-change characteristic:

The CCT curve of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 1.

B tempering characteristics:

High rigidity height polishing pre-hardening plastic mould steel belt roof bolt rational curve of the present invention as shown in Figure 2.

C microstructure:

The microstructure of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 3.

embodiment 2

In the present embodiment, moiety and the mass percent thereof of the employing of high rigidity height polishing pre-hardening plastic mould steel are as follows:

C 0.26%, Si 0.20%, Mn 1.7%, Cr 1.8%,

Mo 0.60%, V 0.20%, P 0.015%, S 0.002%,

Ni 1.00%, Nb 0.06%, Fe surplus.

The technological process that material in employing above-described embodiment carrys out production high rigidity height polishing pre-hardening plastic mould steel is identical with embodiment 1 with step, does not repeat them here.

The present embodiment high rigidity height polishing pre-hardening plastic mould steel is after above-mentioned smelting and hot-work and thermal treatment, and final finished specification is (the wide * of long * is thick) 2500mm*1300mm*500mm module, and performance test is carried out in sampling, and test result is:

A phase-change characteristic:

The CCT curve of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 4.

B tempering characteristics:

High rigidity height polishing pre-hardening plastic mould steel belt roof bolt rational curve of the present invention as shown in Figure 5.

C microstructure:

The microstructure of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 6.

embodiment 3

in the present embodiment, moiety and the mass percent thereof of the employing of high rigidity height polishing pre-hardening plastic mould steel are as follows:

C 0.25%, Si 0.10%, Mn 1.50%, Cr 1.50%,

Mo 0.50%, V 0.10%, P 0.005%, S 0.001%,

Ni 0.60%, Nb 0.001%, Fe surplus.

Adopt the material in this embodiment to come the technological process of production high rigidity height polishing pre-hardening plastic mould steel and step as described in example 1 above, do not repeat them here.

High rigidity 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 thick) 2500mm*1300mm*500mm module, and performance test is carried out in sampling, and test result is:

A phase-change characteristic:

The CCT curve of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 7.

B tempering characteristics:

High rigidity height polishing pre-hardening plastic mould steel belt roof bolt rational curve of the present invention as shown in Figure 8.

C microstructure:

The microstructure of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 9.

comparative example

h11 steel moiety and mass percent as follows:

C 0.38, Si 1.00, Mn 0.40, Cr 5.20, Mo 1.30, V 0.40, P 0.025, S 0.003, Fe surplus.

Prepared by employing ordinary method, final finished specification is (the wide * of long * is thick) 2500mm*1300mm*500mm module, and performance test is carried out in sampling, and test result is:

A phase-change characteristic:

The CCT curve of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 10.

B tempering characteristics:

High rigidity height polishing pre-hardening plastic mould steel belt roof bolt rational curve of the present invention as shown in Figure 11.

C microstructure:

The microstructure of high rigidity height polishing pre-hardening plastic mould steel of the present invention as shown in Figure 12.

Claims (4)

1. a high rigidity height polishing pre-hardening plastic mould steel, it is characterized in that: in the chemical composition of described plastic mould steel, the mass percent of each main alloy element is: C is 0.25 ~ 0.40%, Si be 0.10 ~ 0.30%, Mn is 1.50 ~ 2.00%, Cr is 1.50 ~ 2.50%, Mo is 0.50 ~ 1.00%, V is 0.10 ~ 0.30%, P≤0.025%, S≤0.005%, Ni 0.60 ~ 1.50%, Nb≤0.15%, surplus is Fe.
2. high rigidity height polishing pre-hardening plastic mould steel according to claim 1, it is characterized in that: in the chemical composition of described plastic mould steel, the mass percent of each main alloy element is: C is 0.26%, Si be 0.20%, Mn is 1.70%, Cr is 1.80%, Mo is 0.60%, V is 0.20%, P≤0.015%, S≤0.002%, Ni is 1.00%, Nb is 0.06%, and surplus is Fe.
3. the preparation technology of high rigidity height polishing pre-hardening plastic mould steel according to claim 1 and 2, is characterized in that this technique has following steps:
A. smelt: undertaken preparing burden by the chemical composition of high rigidity height polishing pre-hardening plastic mould steel and mass percent, electric arc furnace smelting and refining, then carry out vacuum outgas and casting, then heat send forge furnace;
B. High temperature diffusion thermal treatment: Heating temperature to 1100 ~ 1200 DEG C, soaking time is 15 ~ 20h;
C. forge hot-work: 900 ~ 1200 DEG C will be cooled to through the heat treated steel ingot of High temperature diffusion, in this temperature range, carry out multiway forging processing, adopt two upsettings two to pull out forging mode, always forge compression ratio >=3, final forging temperature >=850 DEG C;
D. heat treatment after forging: air cooling after forging, then fill normalizing furnace normalizing treatment, Heating temperature 880 ~ 950 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;
E. hydrogen annealing is expanded: 600 ~ 700 DEG C of temperature range inside holding 40 ~ 50 hours, stove was chilled to less than 200 DEG C and comes out of the stove;
F. Pre-hardening treatment: be heated to 850 ~ 950 DEG C, be incubated 20 ~ 30 hours, water-cooled of coming out of the stove or mist are chilled to surface temperature less than 200 DEG C, enter tempering stove;
G. tempering heat treatment: be heated to 500 ~ 600 DEG C, be incubated 20 ~ 40 hours, stove is chilled to less than 250 DEG C, air cooling of coming out of the stove.
4. the preparation technology of high rigidity height polishing pre-hardening plastic mould steel according to claim 3, is characterized in that: in described High temperature diffusion heat treatment step, heats up and adopts stepped heating mode.
CN201410711833.9A 2014-04-28 2014-12-01 High rigidity height polishing pre-hardening plastic mould steel and preparation technology thereof CN104532154B (en)

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Cited By (14)

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CN105274448A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Highly polished pre-hardening plastic die steel and manufacturing process thereof
CN105274437A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof
CN105861942A (en) * 2016-05-13 2016-08-17 如皋市宏茂重型锻压有限公司 Cold work die steel and preparation process thereof
CN106077391A (en) * 2016-07-28 2016-11-09 柳州科尔特锻造机械有限公司 A kind of process of steel alloy forging
CN106077390A (en) * 2016-07-28 2016-11-09 柳州科尔特锻造机械有限公司 A kind of process of vanadium alloy forging
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
CN108060354A (en) * 2017-12-22 2018-05-22 浙江天基重工机械有限公司 A kind of plastic mould steel and its processing technology
CN108441613A (en) * 2018-04-10 2018-08-24 抚顺特殊钢股份有限公司 A kind of anti-white point control method of age-hardening plastic mould steel
CN109023104A (en) * 2018-09-25 2018-12-18 成都先进金属材料产业技术研究院有限公司 4Cr13 plastic die steel and preparation method thereof
CN109182669A (en) * 2018-11-22 2019-01-11 钢铁研究总院 High hardness high toughness easily welds pre-hardening plastic die steel and preparation method thereof
CN109706397A (en) * 2019-01-18 2019-05-03 东北大学 A kind of pre-hardened plastic mold steel and preparation method thereof
CN109926500A (en) * 2019-01-07 2019-06-25 安徽力源数控刃模具制造有限公司 A kind of alloy aluminium sheet pressure arc mold materials and its processing technology
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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Cited By (15)

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Publication number Priority date Publication date Assignee Title
CN105274448A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Highly polished pre-hardening plastic die steel and manufacturing process thereof
CN105274437A (en) * 2015-10-08 2016-01-27 如皋市宏茂重型锻压有限公司 Thermal fatigue resisting and high performance hot working die steel and manufacturing process thereof
CN105861942A (en) * 2016-05-13 2016-08-17 如皋市宏茂重型锻压有限公司 Cold work die steel and preparation process thereof
CN106077391A (en) * 2016-07-28 2016-11-09 柳州科尔特锻造机械有限公司 A kind of process of steel alloy forging
CN106077390A (en) * 2016-07-28 2016-11-09 柳州科尔特锻造机械有限公司 A kind of process of vanadium alloy forging
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
CN108060354A (en) * 2017-12-22 2018-05-22 浙江天基重工机械有限公司 A kind of plastic mould steel and its processing technology
CN108441613A (en) * 2018-04-10 2018-08-24 抚顺特殊钢股份有限公司 A kind of anti-white point control method of age-hardening plastic mould steel
CN108441613B (en) * 2018-04-10 2019-09-13 抚顺特殊钢股份有限公司 A kind of anti-white point control method of age-hardening plastic mould steel
CN109023104A (en) * 2018-09-25 2018-12-18 成都先进金属材料产业技术研究院有限公司 4Cr13 plastic die steel and preparation method thereof
CN109182669A (en) * 2018-11-22 2019-01-11 钢铁研究总院 High hardness high toughness easily welds pre-hardening plastic die steel and preparation method thereof
CN109926500A (en) * 2019-01-07 2019-06-25 安徽力源数控刃模具制造有限公司 A kind of alloy aluminium sheet pressure arc mold materials and its processing technology
CN109706397A (en) * 2019-01-18 2019-05-03 东北大学 A kind of pre-hardened plastic mold steel and preparation method thereof
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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