CN110055464A - Tough hot stamping die steel of a kind of fine grain height and preparation method thereof - Google Patents
Tough hot stamping die steel of a kind of fine grain height and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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- C—CHEMISTRY; METALLURGY
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- 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
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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Abstract
The present invention relates to high tough hot stamping die steel of a kind of fine grain and preparation method thereof, and (1) present component is formulated following (element weight percent): C 0.28-0.40%；Si 0.20-1.05%；Mn 0.25-0.85%；Cr 3.5-5.5%；Mo 2.2-3.4%；W 0.8-2%, V 0.1-1.0%；Remaining micro residue element is S, P, N, O, H etc., and Fe is surplus.(2) hot stamping die steel technical process of the present invention is melting after ingredient, it is cast into electrode bar, electrode bar is cast into round steel ingot after electroslag remelting, steel ingot passes through high temperature homogenization, then jumping-up and pulling on press, then stress relief annealing, last ultra fine and modifier treatment obtain finished product.Hot stamping die crystalline grain of steel size of the present invention has excellent obdurability, high temperature friction and wear behavior, high temperature heat resistance, thermal stability, thermal fatigue property and high thermal conductivity carefully to about 1-4 μm.
Description
Technical field
The present invention relates to high tough hot stamping die steel of a kind of fine grain and preparation method thereof, belong to steel alloy manufacturing technology neck
Domain.
Background technique
High-temp and high-strength steel plate completes punch forming and quenching in mold, and mold must have high-intensitive, wear-resistant, high
Thermal fatigue property, high thermal conductivity, thermal stability, high leakproofness and corrosion resisting property etc.；The H13 steel of early application is at 600 DEG C
Thermal conductivity in the left and right 20W/ (mK), wearability and thermal fatigue property are bad, and later Assab drop silicon increases molybdenum and releases 8418 steel
(DIEVAR steel), makes it have higher impact flexibility and wearability.However, the relatively low thermal conductivity of 8418 steel and hot obdurability are still
It is not able to satisfy the harsh conditions of current high-strength steel hot, there is an urgent need to develop the mold materials for being able to satisfy drop stamping demand.
W, Mo is the comprehensive effective element for promoting wearability, high temperature heat resistance and thermal conductivity, and the disperse educt of WC can
Grain coarsening is prevented, the present invention will increase molybdenum on the basis of 8418 composition of steel and add tungsten, the wear-resisting precipitated phase of WC of small and dispersed is formed,
This precipitated phase is intensive to be pinned at around small grains, and growing up for crystal grain is hindered.Therefore, this kind of fine grain hot stamping die steel will
There is better wearability, Gao Wenre obdurability and thermal conductivity than 8418 steel.
Summary of the invention
It is an object of the present invention to provide a kind of high tough hot stamping die steel of fine grain.
Another object of the present invention is to provide a kind of preparation method of high tough hot stamping die steel of fine grain.
The component prescription that the present invention provides a kind of high tough hot stamping die steel of fine grain is as follows: element weight percent C:
0.28-0.40%；Si:0.20-1.05%；Mn:0.25-0.85%；Cr:3.5-5.5%；Mo:2.2-3.4%；W:0.8-
2%；V:0.1-1.0%；Fe and micro residue element S, P, N, O, H are surplus.
Above-mentioned mould steel is named as SR2019, and S generation claims "upper", that is, Shanghai University Of Engineering Science, and R generation claims " day " i.e. Hubei day
Science and Technology Ltd. is contained, 2019 i.e. " 2019 ".
The preparation method of the high tough hot stamping die steel of above-mentioned fine grain, it is characterised in that use technical process below and step
It is rapid:
1) melting: being put into melting in electric arc furnaces for ingredient, and formation electrode steel in mold is cast at 1500 DEG C -1650 DEG C
Stick, clearing electrode stick surface scale and pit defect after demoulding；
2) electroslag remelting: electrode bar carries out electroslag remelting, most of not neat in filtering electrode stick, and changes its shape
State distribution, is finally cast into round steel ingot；
3) high temperature homogenization: being heated to 1230-1265 DEG C for round steel ingot, and keeping the temperature (0.2~0.4) × D hours D is steel
Ingot diameter dimension cm, keeps component diffusion in steel uniform, is subsequently cooled to 1180 DEG C of forging temperature；
4) jumping-up: by 1180 DEG C of ± 10 DEG C of steel ingots along steel ingot short transverse progress jumping-up to 45% height on press, so
Finishing afterwards melts down heating 2-4 hours, then carries out second of jumping-up, finishing, melts down heat preservation 2-4 hours, then carry out third time upsetting
Slightly, finishing remains 870 DEG C of final forging temperature or more；
5) it pulls out: the steel ingot three times repeatedly after jumping-up being pulled out and forged to final size, final forging temperature 870 is kept
DEG C or more, hole is cooled to 350 DEG C or so after pulling；
6) stress relief annealing: module is heated to 850 DEG C of annealing 10-16 hours, stress is eliminated, then with furnace cold cut；
7) ultra fine: it is forging effective dimensions cm that module, which is heated to 0.2 × d hours d of 1060-1100 DEG C of heat preservation,
To room temperature, then heating to 860 DEG C of isothermals (0.4~0.6) × d hours d is forging effective dimensions cm, is then furnace-cooled to for water quenching
The d of 740 DEG C of isothermals (0.9~1.2) × d hours is forging effective dimensions cm, then with being furnace-cooled to room temperature.
8) modifier treatment: being heated to 1060 DEG C for module and keep the temperature 2 hours, vacuum air-quenching to room temperature, and 560 DEG C of tempering 10 are small
When, after being air-cooled to room temperature, it is tempered 10 hours, comes out of the stove air-cooled at 600 DEG C.
Theoretical foundation of the invention: the high temperature friction and wear behavior of 8418 steel (DIEVAR steel), heat resistance, thermal stability,
Thermal fatigue property and thermal conductivity are not able to satisfy the harsh conditions of current high-strength steel hot still, and there is an urgent need to develop be able to satisfy heat
The mold materials of punching press demand.Universal alloying thinking is to reduce chromium content, to promote thermal conductivity, and increases manganese content promotion
Wearability reduces chromium and is difficult to ensure inoxidizability and corrosion resistance however, chromium is Cr5 Series Die Steel core element；Increase
Manganese addition member is known as the risk for increasing big module manganese element segregation.In addition, current hot die steel is still with the flat-die forging of big module
Based on, superfining process is aided in, the benign combination of the two could obtain fine and tissue is precipitated, but determine impact flexibility and synthesis
The inherent grain size of performance is still uncontrolled.In addition, can promote simultaneously high-strength intensity on the basis of crystal grain refinement and heat is steady
It is qualitative, and good impact flexibility is kept, this is a great problem for perplexing current mold materials research worker.
W, Mo is the comprehensive effective element for promoting wearability, high temperature heat resistance and thermal conductivity, and the disperse educt of WC can
Grain coarsening is prevented, the present invention will increase molybdenum on the basis of 8418 composition of steel and add tungsten, the wear-resisting precipitated phase of WC of small and dispersed is formed,
This precipitated phase is intensive to be pinned at around small grains, and growing up for crystal grain is hindered.Therefore, this kind of fine grain hot stamping die steel will
There is better wearability, Gao Wenre obdurability and thermal conductivity than 8418 steel.
SR2019 hot stamping die crystalline grain of steel size of the present invention carefully to about 1-4 μm there is excellent obdurability, high temperature to rub
Wipe polishing machine, high temperature heat resistance, thermal stability, thermal fatigue property and high thermal conductivity.
The beneficial effects of the present invention are:
(1) impact flexibility of invention steel grade SR2019 will be maintained at 8418 steel (DIEVAR steel) excellent level, not only have
There are excellent high temperature friction and wear behavior, high temperature heat resistance, thermal stability, thermal fatigue property, and part solid solution Mo and W element
Thermal conductivity will be obviously improved.
(2) due to being beneficial to conventional mass production and realizing the invention steel from the refinement for realizing grain size at subangle
Stablize trial-production.
(3) grain size for promoting hot stamping die steel is maintained at 8 grades of ASTM or more by the present invention, hardness 50-56HRC model
It encloses, 7 × 10 × 55 non-notch style ballistic works are greater than 280J.
Detailed description of the invention
Fig. 1 is 1000 times of metallographic structure figures of the mould steel of the application
Fig. 2 is the test comparison chart of 600 DEG C of tempering the application mould steel and 8418 steel thermal stability
Fig. 3 is the test comparison chart of the application mould steel and 8418 steel fretting wear coefficients
Specific embodiment
Technical solution of the present invention is illustrated below in conjunction with specific embodiment.
Embodiment 1
The present invention provides following (the element wt percentage of component prescription of high tough hot stamping die steel SR2019 of fine grain a kind of
Than): C 0.45%；Si 1.05%；Mn 0.25%；Cr 3.5%；Mo 3.4%；W 2%V 1.0%；Fe and micro residue
Element S, P, N, O, H are surplus.
In the present embodiment, the technical process of SR2019 steel and steps are as follows:
A. melting: being put into melting in electric arc furnaces for ingredient, is then cast into φ 290mm × 2050mm electrode bar, electrode bar
Descaling and the defects of pit after demoulding.
B. electroslag remelting: carrying out electroslag remelting refining for electrode bar, removes most of not neat in electrode bar, and change
Become its fractions distribution, is then cast into 1 ton of round steel ingot.
C. high temperature homogenization: by 1 ton of Heating Steel Ingots to 1245 DEG C, 11 hours are kept the temperature, then slow cooling to 1180 DEG C of preparations is forged
Make processing.
E. jumping-up: by 1180 DEG C of steel ingots along steel ingot short transverse jumping-up to 40% height, heating 3 is melted down in then finishing
Hour, then second of jumping-up is carried out, finishing melts down heat preservation 3 hours, then carries out third time jumping-up, finishing, keeps final forging temperature
870 DEG C or more.
F. pull out: to the steel ingot three times repeatedly after jumping-up forge pulling to final size 165mm × 520mm ×
1550mm is kept for 870 DEG C of final forging temperature or more, and hole is cooled to 350 DEG C or so after pulling.
G. stress relief annealing: module is heated to 850 DEG C and is annealed 10 hours, stress is eliminated, then with furnace cold cut.
H. ultra fine: module is heated to 1060 DEG C and keeps the temperature 3.5 hours, water quenching to room temperature then heats to 860 DEG C
Isothermal 7 hours, then it is furnace-cooled to 740 DEG C, isothermal 15 hours, then with being furnace-cooled to room temperature.
I. modifier treatment: being heated to 1060 DEG C for module and keep the temperature 2 hours, vacuum air-quenching to room temperature, and 560 DEG C of tempering 10 are small
When, after being air-cooled to room temperature, it is tempered 10 hours, comes out of the stove air-cooled at 600 DEG C.
Performance test
Above-mentioned SR2019 steel is tested for the property, as a result as follows:
(1) quenched rear hardness 53HRC；
(2) the style ballistic work of non-notch 7 × 10 × 55 is greater than 280J；
Open the ballistic work 26J of U-shaped notch
(3) thermal stability: SR2019 steel and 8418 steel are sentenced in 600 DEG C of heat preservations different time with the downward trend of hardness
The superiority and inferiority of disconnected thermal stability.As shown in table 1 (wt.%), thermal stability data compares as shown in table 2 and figure 2 comparison of ingredients.
(4) wearability: SR2019 steel and 8418 steel carry out room temperature frictional wear experiment, by the fluctuation for comparing coefficient of friction
Judge the superiority and inferiority of wearability, coefficient of friction is lower, wearability is better, as shown in Figure 3.
Table 1 8418 and SR2019 composition of steel compare
| Grade of steel | C | Si | Mn | Cr | Mo | W | V | S | P |
| 8418 | 0.36 | 0.25 | 0.45 | 5.2 | 2.25 | 0 | 0.55 | 0.002 | 0.006 |
| SR2019 | 0.45 | 1.05 | 0.25 | 3.5 | 3.4 | 2 | 1 | 0.002 | 0.009 |
2 600 DEG C of tempering different times 8418 of table and SR2019 steel hardness compare
| Grade of steel | 5h | 10h | 15h | 20h | 25h | 30h | 35h | 40h |
| 8418 | 50 | 49 | 46 | 43 | 41 | 40 | 38 | 32 |
| SR2019 | 53 | 53 | 50 | 49.5 | 48 | 47 | 45 | 42 |
Claims (2)
1. a kind of high tough hot stamping die steel of fine grain, it is characterised in that component prescription is as follows: according to element weight percent C
0.28-0.40%；Si 0.20-1.05%；Mn 0.25-0.85%；Cr 3.5-5.5%；Mo 2.2-3.4%；W 0.8-
2%, V 0.1-1.0%；Fe and micro residue element S, P, N, O, H are surplus.
2. a kind of preparation method of the high tough hot stamping die steel of fine grain according to claim 1, it is characterised in that use
Technical process and step below:
1) melting: being put into melting in electric arc furnaces for ingredient, and formation electrode rod iron in mold is cast at 1500 DEG C -1650 DEG C, is taken off
Clearing electrode stick surface scale and pit defect after mould；
2) electroslag remelting: electrode bar carries out electroslag remelting, most of not neat in filtering electrode stick, and changes its form point
Cloth is cast into round steel ingot；
3) high temperature homogenization: being heated to 1230-1265 DEG C for round steel ingot, keep the temperature (0.2~0.4) × D hours, and D is that steel ingot is straight
Diameter size cm, keeps component diffusion in steel uniform, is subsequently cooled to 1180 DEG C of forging temperature；
4) jumping-up: carrying out jumping-up to 45% height along steel ingot short transverse on press for 1180 DEG C of ± 10 DEG C of steel ingots, then smart
It is whole, heating 2-4 hours is melted down, then carry out second of jumping-up, finishing melts down heat preservation 2-4 hours, then carries out third time jumping-up, essence
It is whole, remain 870 DEG C of final forging temperature or more；
5) pull out: the steel ingot three times repeatedly after jumping-up pulled out and forged to final size, keep 870 DEG C of final forging temperature with
On, hole is cooled to 350 DEG C or so after pulling；
6) stress relief annealing: module is heated to 850 DEG C of annealing 10-16 hours, stress is eliminated, then with furnace cold cut；
7) ultra fine: module is heated to 1060-1100 DEG C of heat preservation 0.2 × d hours, d is forging effective dimensions cm, water quenching
To room temperature, 860 DEG C of isothermals (0.4~0.6) × d hours are then heated to, 740 DEG C of isothermal (0.9~1.2) × d are then furnace-cooled to
Hour, then with being furnace-cooled to room temperature；
8) modifier treatment: being heated to 1060 DEG C for module and keep the temperature 2 hours, and vacuum air-quenching to room temperature, 560 DEG C are tempered 10 hours, empty
After being cooled to room temperature, it is tempered 10 hours, comes out of the stove air-cooled at 600 DEG C.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110669982A (en) * | 2019-10-08 | 2020-01-10 | 鞍钢股份有限公司 | Microalloyed die steel with high purity and preparation method thereof |
| CN112795843A (en) * | 2020-12-28 | 2021-05-14 | 武钢集团襄阳重型装备材料有限公司 | Hot work die steel and preparation method thereof |
| CN114990424A (en) * | 2021-11-22 | 2022-09-02 | 上海双舜科技发展有限公司 | High-alloy hot-work die steel and processing technology thereof |
| CN116377330A (en) * | 2023-04-08 | 2023-07-04 | 浙江通特重型锻造有限公司 | Hot work die steel and preparation method thereof |
| WO2023137842A1 (en) * | 2022-01-18 | 2023-07-27 | 河北工业职业技术学院 | Die steel having high thermal diffusion coefficient, and preparation method therefor |
| CN116516130A (en) * | 2023-07-05 | 2023-08-01 | 成都先进金属材料产业技术研究院股份有限公司 | Cr-Mo-V hot work die steel with high hardness and high impact toughness and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112795843A (en) * | 2020-12-28 | 2021-05-14 | 武钢集团襄阳重型装备材料有限公司 | Hot work die steel and preparation method thereof |
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| WO2023137842A1 (en) * | 2022-01-18 | 2023-07-27 | 河北工业职业技术学院 | Die steel having high thermal diffusion coefficient, and preparation method therefor |
| CN116377330A (en) * | 2023-04-08 | 2023-07-04 | 浙江通特重型锻造有限公司 | Hot work die steel and preparation method thereof |
| CN116377330B (en) * | 2023-04-08 | 2024-02-09 | 浙江通特重型锻造有限公司 | Hot work die steel and preparation method thereof |
| CN116516130A (en) * | 2023-07-05 | 2023-08-01 | 成都先进金属材料产业技术研究院股份有限公司 | Cr-Mo-V hot work die steel with high hardness and high impact toughness and preparation method thereof |
| CN116516130B (en) * | 2023-07-05 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Cr-Mo-V hot work die steel with high hardness and high impact toughness and preparation method thereof |
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