CN104532154B - High rigidity height polishing pre-hardening plastic mould steel and preparation technology thereof - Google Patents
High rigidity height polishing pre-hardening plastic mould steel and preparation technology thereof Download PDFInfo
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- CN104532154B CN104532154B CN201410711833.9A CN201410711833A CN104532154B CN 104532154 B CN104532154 B CN 104532154B CN 201410711833 A CN201410711833 A CN 201410711833A CN 104532154 B CN104532154 B CN 104532154B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Abstract
The present invention relates to a kind of high rigidity height polishing pre-hardening plastic mould steel and manufacturing process thereof, belong to steel alloy manufacturing process technology field.This steel is characterised by alloy composition that 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%, P≤0.025%, S≤0.005%, Ni 0.60～1.50%, Nb≤0.15%, Fe surplus.The preparation process of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as follows: dispensing, smelting, pouring, heat is sent；The hot heat treatment of high temperature expanding, then multiway forging hot-working, thin brilliant normalizing and expansion hydrogen anneal process after forging；Finally carry out quenching and tempering heat treatment, it is thus achieved that the tempered structure of hardness 38～42HRC.Steel of the present invention has low cost, high quenching degree, high rigidity, high polishing performance and dermatoglyph etching performance.
Description
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,
Further relate to prepare the preparation technology of this plastic mould steel, belong to technical field of alloy steel.
Background technology
Along with developing rapidly of China's manufacturing industry, increasing to the consumption of mould, to the performance requirement of mold materials also
More and more higher.In auto manufacturing, mould is all used in the production of automobile lamp, rearview mirror, instrumental panel, inside gadget etc..These
Mould requires to have high polishing performance and processing characteristics, and currently used is that H11 Steel material is to manufacture these moulds mostly.But
Being that H11 price of steel product is higher, this will be greatly increased the manufacturing cost of these automobile products.Whole world warp since particularly 2012
Under Ji end fan's environment, economize on resources and reduce the big bottleneck that cost is auto manufacturing.
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 above-mentioned technical problem, the concrete technology that high rigidity height of the present invention polishing pre-hardening plastic mould steel is used
Scheme is:
A kind of high rigidity height polishing pre-hardening plastic mould steel, its innovative point is: the chemistry one-tenth of described plastic mould steel
In Fen, 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 invention solves the problems that is to provide a kind of this high rigidity height that produces and polishes pre-hardening plastic mold
The method of tool steel.
For solving above-mentioned technical problem, the preparation technology of high rigidity height of the present invention polishing pre-hardening plastic mould steel is taked
Concrete technical scheme as follows:
The preparation technology of a kind of high rigidity height polishing pre-hardening plastic mould steel, its innovative point is: described preparation technology
Have steps of:
A. smelt: by the high rigidity height polishing chemical composition of pre-hardening plastic mould steel and mass percent carry out dispensing,
Electric arc furnace smelting and refine, then carrying out vacuum outgas and casting, then heat send forge furnace；
B. High temperature diffusion heat treatment: heating-up temperature is 1100～1200 DEG C, temperature retention time is 15～20h；
C. hot-working is forged: the steel ingot through High temperature diffusion heat treatment is cooled to 900～1200 DEG C, in this temperature range
Inside carry out multiway forging processing, use 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 dress normalizing furnace normalized treatment, heating-up temperature 880～950 DEG C, it is incubated 10
～15 hours, air cooling of coming out of the stove to less than 200 DEG C, advance and retreat stove；
E. hydrogen annealing is expanded: 600～700 DEG C of temperature range inside holding 40～50 hours, stove was cooled to less than 200 DEG C and comes out of the stove；
F. Pre-hardening treatment: being heated to 850～950 DEG C and be incubated 20～30 hours, water-cooled of coming out of the stove or mist are cold or air-cooled to table
Surface temperature less than 200 DEG C, enters tempering furnace；
G. tempering heat treatment: be heated to 500～600 DEG C, is incubated 20-40 hour, and stove is cooled 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 use stepped heating mode.
Beneficial effects of the present invention: high rigidity height of the present invention polishing pre-hardening plastic mould steel improves the content of Mo and adds
Add microalloy element Nb.Due to the Mo element of high level, and there is higher quenching degree and hardenability.The addition of microalloy Nb
Can effectively refine crystal grain and the homogeneity of ingredients of steel, make prevulcanized steel have higher uniformity of hardness, thus obtain higher
Polishing performance.
In conjunction with above feature, compared with H11, steel grade of the present invention has higher polishing performance and relatively low cost of alloy,
This brings huge contribution for China's manufacturing industry especially auto manufacturing, and improves China's mould steel manufacture level and market
Competitiveness.
Accompanying drawing explanation
Fig. 1 show the CCT curve figure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 1.
Fig. 2 show the high rigidity height polishing pre-hardening plastic mould steel belt roof bolt characteristic curve of embodiment 1.
Fig. 3 show the metallographic structure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 1.
Fig. 4 show the CCT curve figure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 2.
Fig. 5 show the high rigidity height polishing pre-hardening plastic mould steel belt roof bolt characteristic curve of embodiment 2.
Fig. 6 show the metallographic structure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 2.
Fig. 7 show the CCT curve figure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 3.
Fig. 8 show the high rigidity height polishing pre-hardening plastic mould steel belt roof bolt characteristic curve of embodiment 3.
Fig. 9 show the metallographic structure of the high rigidity height polishing pre-hardening plastic mould steel of embodiment 3.
Figure 10 show the CCT curve figure of H11 steel.
Figure 11 show H11 steel belt roof bolt characteristic curve.
Figure 12 show the metallographic structure of H11 steel.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage of greater clarity, present invention specific examples below
Technical scheme is described further, but the invention is not restricted to specific examples below.
Embodiment 1
In the present embodiment, the constituent of high rigidity height polishing pre-hardening plastic mould steel employing and percent mass thereof are such as
Under:
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.
Use the material in this embodiment to produce technical process and the step of high rigidity height polishing pre-hardening plastic mould steel
Rapid as follows:
1. smelt: carry out dispensing by the alloying element proportioning in embodiment, dispensing is sent into electric arc furnace and carries out smelting and essence
Refining, then uses vacuum outgas to remove the gas dissolved in liquid metal, prevents defect, be finally cast into steel ingot, then
Heat send forge furnace；Heat is used to send the purpose being contemplated to reach energy-saving and emission-reduction.
2. High temperature diffusion heat treatment: by steel ingot in forge furnace classification heat up, the most respectively 600 DEG C, 800 DEG C,
Finally heated to 1100～1200 DEG C of 1100 DEG C of isothermals, are incubated 15～20h, so are able to ensure that steel ingot internal and external temperature is uniform,
In order to enable steel ingot to eliminate dendritic segregation as much as possible, temperature retention time is 20h.
3. forging hot-working: the steel ingot through High temperature diffusion heat treatment is cooled to 900～1200 DEG C, in this temperature range
Inside carry out multiway forging processing, use 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 steel ingot normalizing furnace and carries out normalized treatment, heating-up temperature 880
～950 DEG C, be incubated 10～15 hours, air cooling of coming out of the stove to less than 200 DEG C, advance and retreat stove；In order to make complete austenitizing in steel ingot,
Obtain preferable mechanical performance, heating-up temperature is selected 930 DEG C, and temperature retention time is 15h.
5. expand hydrogen annealing: being incubated 40～50 hours at 600～700 DEG C, stove is cooled to less than 200 DEG C and comes out of the stove；In order to make solid solution
The hydrogen of Yu Gangzhong spreads elimination completely, it is to avoid occur white point class hydrogen embrittlement in tissue, and the temperature retention time in this step selects 50 hours.
6. Pre-hardening treatment: being heated to 850～950 DEG C and be incubated 20～30 hours, water-cooled of coming out of the stove or mist are cold or air-cooled to table
Surface temperature less than 200 DEG C, enters tempering furnace；In order to make to be quenched to by steel in this step martensite, selecting temperature retention time is 30 hours,
Meanwhile, relatively big by steel ingot internal stress after water-cooled, it is easily deformed cracking, during air cooling, rate of cooling is relatively slow, so the choosing of this step
Select mist cold.
7. tempering heat treatment: be heated to 500～600 DEG C, is incubated 20～40 hours, and stove is cooled to less than 250 DEG C, sky of coming out of the stove
Cold, in order to make steel ingot sufficiently be tempered, produce tempered sorbite, eliminate internal stress, prevent workpiece deformation or cracking, this step
In rapid, temperature retention time selects 30 hours.
High rigidity height polishing pre-hardening plastic mould steel in the present embodiment is through above-mentioned smelting and hot-working and heat treatment
After, final finished specification is (long * width * is thick) 2500mm*1300mm*500mm module, and sampling carries out performance test, test result
For:
A phase-change characteristic:
The CCT curve of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 1.
B tempering characteristics:
High rigidity height of the present invention polishing pre-hardening plastic mould steel belt roof bolt characteristic curve is as shown in Figure 2.
C microscopic structure:
The microscopic structure of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 3.
Embodiment 2
In the present embodiment, the constituent of high rigidity height polishing pre-hardening plastic mould steel employing and percent mass thereof are such as
Under:
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.
Use the material in above-described embodiment produce high rigidity height polishing pre-hardening plastic mould steel technical process and
Step is same as in Example 1, does not repeats them here.
The present embodiment high rigidity height polishing pre-hardening plastic mould steel is after above-mentioned smelting and hot-working and heat treatment,
Finally finished specification is (long * width * is thick) 2500mm*1300mm*500mm module, and sampling carries out performance test, and test result is:
A phase-change characteristic:
The CCT curve of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 4.
B tempering characteristics:
High rigidity height of the present invention polishing pre-hardening plastic mould steel belt roof bolt characteristic curve is as shown in Figure 5.
C microscopic structure:
The microscopic structure of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 6.
Embodiment 3
In the present embodiment, the constituent of high rigidity height polishing pre-hardening plastic mould steel employing and percent mass thereof are such as
Under:
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.
Use the material in this embodiment to produce technical process and the step of high rigidity height polishing pre-hardening plastic mould steel
The most as described in example 1 above, do not repeat them here.
High rigidity height of the present invention polishing pre-hardening plastic mould steel is after above-mentioned smelting and hot-working and heat treatment, finally
Trimmed size is (long * width * is thick) 2500mm*1300mm*500mm module, and sampling carries out performance test, and test result is:
A phase-change characteristic:
The CCT curve of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 7.
B tempering characteristics:
High rigidity height of the present invention polishing pre-hardening plastic mould steel belt roof bolt characteristic curve is as shown in Figure 8.
C microscopic structure:
The microscopic structure of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 9.
Comparative example
H11 steel constituent and mass percent thereof are 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 conventional method, final finished specification is (long * width * is thick) 2500mm*1300mm*500mm module, sampling
Carrying out performance test, test result is:
A phase-change characteristic:
The CCT curve of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 10.
B tempering characteristics:
High rigidity height of the present invention polishing pre-hardening plastic mould steel belt roof bolt characteristic curve is as shown in Figure 11.
C microscopic structure:
The microscopic structure of high rigidity height of the present invention polishing pre-hardening plastic mould steel is as shown in Figure 12.
Claims (3)
1. a high rigidity height polishing pre-hardening plastic mould steel, it is characterised 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%, and Si is 0.10～0.30%, and Mn is 1.50～2.00%,
Cr is 1.50～2.50%, and Mo is 0.50～1.00%, and V is 0.10～0.30%, P≤0.025%, S≤0.005%, Ni 0.60～
1.50%, Nb≤0.15%, surplus is Fe；
The preparation technology of above-mentioned high rigidity height polishing pre-hardening plastic mould steel has steps of:
A, smelting: chemical composition and mass percent by high rigidity height polishing pre-hardening plastic mould steel carry out dispensing, electric arc
Stove is smelted and refine, then carries out vacuum outgas and casting, and then heat send forge furnace；
B, High temperature diffusion heat treatment: heating-up temperature to 1100 ~ 1200 DEG C, temperature retention time is 15 ~ 20h；
C, forging hot-working: the steel ingot through High temperature diffusion heat treatment is cooled to 900 ~ 1200 DEG C, enters in this temperature range
Row multiway forging is processed, and uses two upsettings two to pull out forging mode, always forges compression ratio >=3, final forging temperature >=850 DEG C；
D, heat treatment after forging: air cooling after forging, then dress normalizing furnace normalized treatment, heating-up temperature 880 ~ 950 DEG C, insulation 10 ~ 15 is little
Time, air cooling of coming out of the stove to less than 200 DEG C, advance and retreat stove；
E, expand hydrogen annealing: 600 ~ 700 DEG C of temperature range inside holding 40 ~ 50 hours, stove was cooled 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, and water-cooled of coming out of the stove or mist are cooled to surface temperature 200 DEG C
Hereinafter, tempering furnace is entered；
G, tempering heat treatment: be heated to 500 ~ 600 DEG C, be incubated 20 ~ 40 hours, and stove is cooled to less than 250 DEG C, air cooling of coming out of the stove.
High rigidity height the most according to claim 1 polishing pre-hardening plastic mould steel, it is characterised in that: described plastic mould
In the chemical composition of steel, the mass percent of each main alloy element is: C is 0.26%, and Si is 0.20%, and Mn is 1.70%, and Cr is
1.80%, Mo are 0.60%, and V is 0.20%, P≤0.015%, S≤0.002%, and Ni is 1.00%, and Nb is 0.06%, and surplus is Fe.
High rigidity height the most according to claim 1 polishing pre-hardening plastic mould steel, it is characterised in that: described High temperature diffusion
In heat treatment step, heat up and use stepped heating mode.
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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 |
| CN105861942B (en) * | 2016-05-13 | 2017-11-03 | 如皋市宏茂重型锻压有限公司 | A kind of cold work die steel and its preparation technology |
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| FR2726287B1 (en) * | 1994-10-31 | 1997-01-03 | Creusot Loire | LOW ALLOY STEEL FOR THE MANUFACTURE OF MOLDS FOR PLASTICS OR FOR RUBBER |
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| JP5641298B2 (en) * | 2010-06-28 | 2014-12-17 | 大同特殊鋼株式会社 | Manufacturing method of steel for plastic molding dies |
| EP2662462A1 (en) * | 2012-05-07 | 2013-11-13 | Valls Besitz GmbH | Low temperature hardenable steels with excellent machinability |
| CN103710625B (en) * | 2013-12-20 | 2016-08-17 | 莱芜钢铁集团有限公司 | A kind of high tougness die steel for plastics and production method thereof |
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