CN108396247A - A kind of high strength and low cost toughness cold working die steel plate and its production method - Google Patents
A kind of high strength and low cost toughness cold working die steel plate and its production method Download PDFInfo
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- CN108396247A CN108396247A CN201710064854.XA CN201710064854A CN108396247A CN 108396247 A CN108396247 A CN 108396247A CN 201710064854 A CN201710064854 A CN 201710064854A CN 108396247 A CN108396247 A CN 108396247A
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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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C21D1/18—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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- 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
- C22C38/18—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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- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of high strength and low cost toughness cold working die steel plate of present invention offer and its production method, chemical composition：C0.50%~0.95%, Si0.6%~0.8%, Mn1.0%~1.5%, Cr6.0%~6.4%, Mo0.2%~0.4%, V0.1%~0.5%, B0.0015%~0.0020%, P ＜ 0.03%, S ＜ 0.03%.Steel billet is heated using two benches, two stepwise heating temperature of control, heating rate and soaking time.Roll control opens, finishing temperature and the first percentage pass reduction and total reduction；Roll rear slow cooling.Heat-treatment quenching controls two benches heating temperature, heating rate and soaking time, is quenched after heating, and oil cooling or air-cooled is used after quenching；Temper is carried out after quenching immediately.The toughness and quenching degree of steel can be improved in the present invention, greatly reduces production cost, produced cold work die steel plate, and hardness and toughness respectively reach the level of Cr12 types and Cr8 cold work die steels.
Description
Technical field
The invention belongs to metal material production technical fields, are related specifically to a kind of high strength and low cost toughness cold working die steel plate
And its production method.
Background technology
Cold work die steel mainly for the manufacture of metal material is suppressed under cold state, cold drawing, punch forming etc.
Mold, such as cold drawing die, cold upsetting die of car, cold extrusion die, imprint mold, since metal material generally has under cold state
There is prodigious difficult morphotropism, therefore mold during the work time will be by prodigious compression, tensile stress and frictional force, this will
Ask cold work die steel that there is very high hardness and wearability, while in order to avoid mold is cracked during manufacture and use
And cracking, it is desirable that cold work die steel has good toughness.
For a long time, main material selection of the Cr12 types cold work die steel as cold-working mold, this kind of steel have very high hardness,
Intensity and wearability, but be easy to form coarse carbide since phosphorus content is higher, in production process, make the obdurability of mold
It reduces, mold tipping or fracture can be caused when serious.In order to adapt to the growth requirement of die industry, in the R＆D process of mould steel
In, mainly for when front mold existing service life problem in use, adjust the alloy in existing mold material
Ingredient, by adjusting alloying element content, improvement production technology in material, reduces under the premise of guarantee material existing performance
The production cost of material, or on the basis of the mold materials that current application is wide, performance is high, improve alloying element proportioning, make material
With better performance.
Application number 201410175592.0 provides " a kind of high-ductility high wear-resistant cold work die steel ", by cold in Cr12 types
Make to reduce Cr contents on the basis of mould steel, make material that there is higher toughness, while increasing Mn, Si content and improving hardness, enhancing
Wearability.Its composition design is C：0.8-1.5%, Si：0.5-1.5%, S≤0.030%, P:≤ 0.030%, Mn≤
1.5%, Mo：0.8-2.5%, Cr：8.0-11.0%, V：0.1-1.0%, Nb≤1.0%.The cold work die steel has higher
Hardness, and there is certain toughness.But its Cr, Mo content is still relatively high.
Application number 200510025603.8 discloses a kind of " production technology of cold work die steel in high alloy through ", composition design
For C1.45-1.55%, Cr7.8-8.2%, V3.9-4.1%, Mo1.4-1.6%, Si0.9-1.1%, Mn0.3-0.5% are adopted
Cold work die steel in high alloy through blank is produced with spray deposition processing, rear plate sand is rolled in aximal deformation value hot rolling of the blank through single pass
The processes such as cold obtain cold work die steel.The steel has higher carbon content, but is easy to form coarse carbide.
Application number：201210503591.5 a kind of " high strength and toughness cold working mould steel and its processing technology " is provided, at setting up separately
It is calculated as：C0.8-1.2%, Si0.40-0.80, Mn0.2-0.5%, Cr8.5-11.0%, Mo1.4-1.6%, V0.2-0.4%,
Nb0.04-0.06%, Ti0.02-0.04%, Sc0.05-0.08%, P≤0.020%, S≤0.003%.Using Metamorphism treatment
Technique improves the performance of cold work die steel to improve the segregation of carbide in cold work die steel process of setting.But its technique mistake
Journey includes the processes such as melting, electroslag remelting, forging, complex technical process, and its Cr, Mo content is still relatively high.
" high-strength toughness cold working die steel and preparation method thereof ", composition design disclosed in application number 200710171694.5
For：C：0.9-1.0%, Cr：9-10%, Mo：2.0%, V：0.8-1.0%, Si：1.0%, P<0.02%, S<0.02%.Steel grade
Cold work die steel, the steel is made in the techniques such as smelting, electroslag remelting, annealing, rough forge, re-annealing, spheroidizing, quenching, tempering
Function admirable.But equally has the shortcomings that complex technical process.
" cold working die steel material and its manufacture craft " disclosed in application number 200810140203.5, the patent at setting up separately
It is calculated as, C：0.95-1.05%, Mn：0.35-0.45%, Si：0.55-0.65%, Cr：7.55-8.5%, Mo：0.45-
0.55%, V：0.35-0.45%, S≤0.025%, P≤0.025%.Using alloying and Metamorphism treatment technique, mould steel tool
There are good quenching degree, anti-temper resistance, higher wearability and good processability.But its production process is using forging work
Skill, the production cycle is long, and cost is higher.
Application number 200910199633.9 discloses " a kind of low-cost, high-strength, high-toughness and its preparation side
Method ", the cold work die steel prepared have higher hardness and toughness, and composition design is C：0.88-1.10%, Si：
0.45-0.65%, Mn：0.20-0.50%, Cr：7.50-9.0%, Mo：1.30-1.80%, V：0.30-0.60%.It is manufactured
Process includes the processes such as melting, electroslag remelting, electroslag remelting after annealing, forging, forging rear annealing, spheroidizing, heat treatment.Production
Complex process, and also contain the elements such as higher Cr, Mo in its ingredient, the cost of cold work die steel can be increased.
Application number：200810121969.9 providing " a kind of cold work die steel in high alloy through ", the cold work die steel prepared
With good hard toughness, composition design is C：1.0-2.5%, Si≤1.3%, Mn≤1.5%, Cr：6.0-15.0%, V
≤ 2.5%, B：0.01-0.4%.It is up to 2.5%, Cr contents containing elements, C such as higher C, Cr in ingredient and is up to
15.0%, it is easy to form coarse carbide, and increase the cost of cold work die steel.
The above patent is compared it is found that being primarily present following deficiency in the manufacture view of cold work die steel at present：
1, carbon content is higher in steel, is easy to form coarse carbide, seriously affects the obdurability of cold work die steel, even
It can lead to mold tipping or fracture.
2, contain higher expensive alloying elements, cause that the production cost increases.
3, production technology is complicated, and the production cycle is long, virtually increases the production cost of cold work die steel.
Invention content
The present invention is intended to provide a kind of cold work die steel plate that high strength and low cost is tough and its production method.
For this purpose, the technical solution that the present invention is taken is：
A kind of high strength and low cost toughness cold working die steel plate, chemical component weight percentage are：C：0.50%~0.95%,
Si：0.6%~0.8%, Mn：1.0%~1.5%, Cr：6.0%~6.4%, Mo：0.2%~0.4%, V：0.1%~
0.5%, B：0.0015%~0.0020%, P ＜ 0.03%, S ＜ 0.03%, surplus are Fe and inevitable impurity.
The mechanism of action of each chemical composition of the present invention is：
C：In cold work die steel, carbon is indispensable element, and content is higher.One side carbon is effective in steel
Solution strengthening element, various carbide on the other hand can be formed, in cold work die steel, it is ensured that sufficient carbide contains
It measures to ensure wearability.But when excessively high the toughness of steel can reduce carbon content, right especially when forming coarse eutectic carbide
The influence of toughness is more serious.The present invention selects that ranging from 0.50%-0.95% is added.
Si：There is the deoxidant element of steelmaking process stronger solid solution strengthening effect, too high levels can then reduce steel in steel
Toughness.The present invention selects that ranging from 0.6%-0.8% is added.
Mn：Suitable Mn can delay steel grade ferrite and pearlite to change, and increase steel grade quenching degree, and it is tough to improve impact
Property.The present invention selects that ranging from 1.0%-1.5% is added.
Cr：Chromium is common alloying element in mould steel, all contains elemental chromium in almost all of alloy die steel.Chromium
The quenching degree of steel can be increased, improve temper resistance, and generate post-curing phenomenon；Chromium is middle carbide,
Carbide can be formed with carbon in steel, solid solution is also dissolved in Fe3C, increases the intensity and wearability of steel；But works as and contain
When measuring excessively high, it is easy to form excessive ledeburite eutectic and bulk carbide.The present invention selects that ranging from 6.0%- is added
6.4%.
Mo：Molybdenum can improve the quenching degree of steel in steel, heat resistance, prevent temper brittleness, can be produced in high tempering
Raw post-curing effect, improves carbide stability, can improve the toughness of steel and improve wearability.The present invention selects that model is added
It encloses for 0.2%-0.4%.
V：Vanadium is carbide, and VC is formed in steel, can improve the plasticity and toughness of steel with crystal grain thinning,
V can improve its wearability in mould steel.The present invention selects that ranging from 0.1%-0.5% is added.
B：Boron can improve the quenching degree of matrix；Martensite substructure is refined, matrix toughness is improved；In annealing process,
It is dissolved B vector preferably secondary compounds to be precipitated, increases secondary precipitation object quantity, improve material homogeneity.The present invention selects to be added
Ranging from 0.0015%-0.0020%.
P：Phosphorus forms microsegregation in solidification of molten steel, then makes in grain boundaries segregation when austenitizing temperature is heated
The toughness of steel reduces, and brittleness increases.The content that the present invention controls phosphorus is less than 0.03%, and the lower content the better.
S：Harmful element makes steel generate red brittleness, reduces the ductility and toughness of steel, cause to split in forging or rolling
Line.The content that the present invention controls sulphur is less than 0.03%, and the lower content the better.
The production method of high strength and low cost toughness cold working die steel plate of the present invention is：
(1) steel billet of casting gained after smelting being put into heating furnace and is heated, heating process is divided into two benches progress,
First stage is heated to 700~750 DEG C, heating rate 11~15 DEG C/min, 0.5~1.0min/mm of soaking time；Second stage
1080~1250 DEG C are heated to, heating rate 10~14 DEG C/min, 1.0~2.0min/mm of soaking time.
(2) billet rolling, 1030~1150 DEG C of start rolling temperature, 800~950 DEG C of finishing temperature control first of steel billet
Secondary reduction ratio is less than 15%, and total reduction 50~90% obtains rolled plate after rolling.
(3) rolled plate is subjected to slow cooling, 650 DEG C of slow cooling start temperature ＞, 30 DEG C/h of cooling velocity ＜.
(4) steel plate is heat-treated after slow cooling：
Quenching, Quench heating technique heat for two benches, 600~800 DEG C of first stage heating temperature, heating rate 6~8
DEG C/min, 2.0~3.0min/mm of soaking time；Second stage heating temperature is 980~1100 DEG C, 10~15 DEG C of heating rate/
Min, 2.0~4.5min/mm of soaking time；Steel plate is quenched after the completion of heating, quenching is cooling to use oil cooling or air-cooled；
It is tempered, is tempered immediately after steel plate quenching, 500~550 DEG C of temperature, 1.5~5.0min/ of soaking time
mm。
Beneficial effects of the present invention are：
The present invention improves the toughness of steel by reducing the content of C element in cold work die steel, and adjustment Cr, Mo element contains
Amount, further decreases the production cost of cold work die steel.Meanwhile improving quenching for cold work die steel by adding cheap B element
Permeability, finally obtains a kind of cold work die steel plate with higher hardness with toughness cooperation, and hardness meets or exceeds Cr12
Type cold work die steel, toughness reach the level of Cr8 cold work die steels.
Specific implementation mode
Chemical composition ranges designed according to this invention are smelted, and embodiment 1-5 chemical compositions are as shown in table 1.
1 embodiment chemical composition wt% of table
| Embodiment | C | Si | Mn | Cr | Mo | V | B | P | S |
| 1 | 0.60 | 0.75 | 1.43 | 6.35 | 0.38 | 0.46 | 0.0018 | 0.010 | 0.006 |
| 2 | 0.85 | 0.77 | 1.28 | 6.23 | 0.24 | 0.37 | 0.0016 | 0.012 | 0.007 |
| 3 | 0.65 | 0.79 | 1.45 | 6.31 | 0.35 | 0.35 | 0.0017 | 0.011 | 0.005 |
| 4 | 0.75 | 0.69 | 1.35 | 6.18 | 0.29 | 0.16 | 0.0019 | 0.010 | 0.005 |
| 5 | 0.90 | 0.65 | 1.20 | 6.13 | 0.31 | 0.21 | 0.0016 | 0.012 | 0.004 |
By the steel of chemical composition shown in table 1 through smelting, being cast into steel billet, steel billet is put into heating furnace and carries out two benches
Heating, heating steel billet technological parameter are as shown in table 2.
2 heating steel billet technological parameter of table
Steel billet after heating is rolled, rear steel plate is rolled and carries out slow cooling, billet rolling and steel plate retarded cooling process parameter such as table 3
It is shown.
3 billet rolling of table and steel plate retarded cooling process parameter
The steel plate that 3 slow cooling of table is completed is heat-treated, steel plate heat treatment process parameter is as shown in table 4.
4 steel plate heat treatment process parameter of table
Service check is carried out to steel plate after the completion of heat treatment, mechanical property of steel plate inspection result is as shown in table 5.
5 mechanical property of steel plate inspection result of table
Claims (2)
1. a kind of high strength and low cost toughness cold working die steel plate, which is characterized in that its chemical component weight percentage is：C：0.50%
~0.95%, Si：0.6%~0.8%, Mn：1.0%~1.5%, Cr：6.0%~6.4%, Mo：0.2%~0.4%, V：
0.1%~0.5%, B：0.0015%~0.0020%, P ＜ 0.03%, S ＜ 0.03%, surplus are Fe and inevitable impurity.
2. a kind of production method of high strength and low cost toughness cold working die steel plate as described in claim 1, it is characterised in that：
(1) steel billet of casting gained after smelting being put into heating furnace and is heated, heating process is divided into two benches and carries out, and first
Stepwise heating is to 700~750 DEG C, heating rate 11~15 DEG C/min, 0.5~1.0min/mm of soaking time；Second stage heats
To 1080~1250 DEG C, heating rate 10~14 DEG C/min, 1.0~2.0min/mm of soaking time；
(2) billet rolling, 1030~1150 DEG C of start rolling temperature, 800~950 DEG C of finishing temperature control the first passage pressure of steel billet
Lower rate is less than 15%, and total reduction 50~90% obtains rolled plate after rolling；
(3) rolled plate is subjected to slow cooling, 650 DEG C of slow cooling start temperature ＞, 30 DEG C/h of cooling velocity ＜；
(4) steel plate is heat-treated after slow cooling：
Quenching, Quench heating technique heat for two benches, 600~800 DEG C of first stage heating temperature, and 6~8 DEG C of heating rate/
Min, 2.0~3.0min/mm of soaking time；Second stage heating temperature is 980~1100 DEG C, 10~15 DEG C of heating rate/
Min, 2.0~4.5min/mm of soaking time；Steel plate is quenched after the completion of heating, quenching is cooling to use oil cooling or air-cooled；
It is tempered, is tempered immediately after steel plate quenching, 500~550 DEG C of temperature, 1.5~5.0min/mm of soaking time.
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| CN201710064854.XA CN108396247A (en) | 2017-02-05 | 2017-02-05 | A kind of high strength and low cost toughness cold working die steel plate and its production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110835670A (en) * | 2019-09-30 | 2020-02-25 | 鞍钢股份有限公司 | High-wear-resistance high-hardness easy-cutting high-end mirror surface plastic die steel and preparation method thereof |
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| CN102653837A (en) * | 2012-02-24 | 2012-09-05 | 宝山钢铁股份有限公司 | High-toughness wear-resistant cold-working die steel and preparation method thereof |
| CN105779898A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | Cold-work die steel plate and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006328521A (en) * | 2005-05-30 | 2006-12-07 | Daido Steel Co Ltd | Tool for precision working and tool steel |
| JP2008056982A (en) * | 2006-08-30 | 2008-03-13 | Daido Steel Co Ltd | Die steel having excellent thermal fatigue property |
| JP2008121032A (en) * | 2006-11-08 | 2008-05-29 | Daido Steel Co Ltd | Die steel superior in spheroidizing annealing property and hardenability |
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|---|---|---|---|---|
| CN110835670A (en) * | 2019-09-30 | 2020-02-25 | 鞍钢股份有限公司 | High-wear-resistance high-hardness easy-cutting high-end mirror surface plastic die steel and preparation method thereof |
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