CN110468334A - The uniform plastic mould thickness band steel of section hardness and its process - Google Patents
The uniform plastic mould thickness band steel of section hardness and its process Download PDFInfo
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- CN110468334A CN110468334A CN201910853253.6A CN201910853253A CN110468334A CN 110468334 A CN110468334 A CN 110468334A CN 201910853253 A CN201910853253 A CN 201910853253A CN 110468334 A CN110468334 A CN 110468334A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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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Abstract
The invention discloses a kind of uniform plastic mould thickness band steel of section hardness and its processes, belong to metallurgical production process technical field.It provides that a kind of processing performance is good, plastic mould thickness band steel and its process that the performance of mold significantly improves is made.The plastic mould thickness band steel be include following weight parts component molding hot forging band steel, C 0.25~0.45%, Si 0.30~0.70%, Mn 0.50~1.0%, Cr 1.30~2.0%, Mo 0.20~0.50%, N 0.05~0.10%, Ti≤0.03%, B≤0.002%, Al≤0.02%, P≤0.015%, S≤0.005%, remaining be Fe and other impurities element.The process includes that molten steel optimization smelts, the casting of open-close type die casting machine, is hot-forged heap cold treatment and the several steps of heat treatment, wherein, when molten steel optimizes and smelts, by being added, micro Ti refines crystal grain, the micro B of addition delays austenite-perlitic transformation incubation period in casting process, when open-close type die casting machine is poured, it is poured using feeding pouring technology in low temperature rising pouring, molten steel is made to be not subject to any deflation resistance, guarantee the molding wide face flawless of base.
Description
Technical field
The present invention relates to a kind of plastic mould thickness band steels, flat more particularly, to a kind of uniform plastic mould thickness of section hardness
Steel belongs to metallurgical production process technical field.
Background technique
With the rapid development of China's plastics industry, demand is also increasing, proposes to plastic mould higher and higher
It is required that this facilitate the continuous developments of plastic mould.Mold materials are the bases for manufacturing production mould.The positive court of plastic mould at present
High efficiency, high-precision, high life direction develop.Nevertheless, the Tool and Die Technology in China and die life still lag behind
Structure is complicated for industrially developed country, mould material and heat treatment plastic mould, thick to plastic mold cavity dimensional accuracy and surface
Rugosity requirement is very high, and the requirement to plastic mold cavity material is harsher.Therefore correct to select mold materials and its heat treatment
Method extends die life and is very important for improving die quality.
With the enlargement increasingly of plastic products, the requirement of plastic die steel thickness specification is also increasing, however finger gauge
The expansion of lattice increases the Properties Control difficulty of steel plate whole plate very much.Hardness distributing homogeneity is the weight of plastic mould steel thick plate
One of performance indicator is wanted, uniformity of hardness difference will lead to the shake in steel plate machining, reduce the quality of cut surface, cause to answer
The defects of power anisotropy or local stress concentrations, uniformity of hardness difference will increase the mill of saw blade in cutting process
Damage degree, increase production this, in process even can there is a phenomenon where saw blades to break, jeopardize the person peace of processing staff
Entirely.
How the uniform steel plate for plastic mould of section hardness obtained by Composition Control and technology controlling and process, become for ability
Field technique personnel technical problem urgently to be solved.
Summary of the invention
The technical problems to be solved by the present invention are: providing, a kind of processing performance is good, and the performance that mold is made significantly improves
The uniform plastic mould thickness band steel of section hardness.The present invention also provides a kind of technique sides for producing the plastic mould thickness band steel
Method.
Used technical solution is to solve above-mentioned technical problem: a kind of uniform plastic mould thickness of section hardness is flat
Steel, the plastic mould thickness band steel are the molding hot forging band steel for including following weight parts component,
C 0.25~0.45%, Si 0.30~0.70%, Mn 0.50~1.0%, Cr 1.30~2.0%, Mo 0.20
~0.50%, N 0.05~0.10%, Ti≤0.03%, B≤0.002%, Al≤0.02%, P≤0.015%, S≤
0.005%, remaining is Fe and other impurities element.
A kind of process producing the plastic mould thickness band steel, the process include molten steel optimization smelt,
The casting of open-close type die casting machine, hot forging heap cold treatment and the several steps of heat treatment,
Wherein, when molten steel optimizes and smelts, by being added, micro Ti refines crystal grain, the micro B of addition delays casting process
The incubation period of middle austenite-perlitic transformation,
When open-close type die casting machine is poured, it is poured using feeding pouring technology in low temperature rising pouring, molten steel is made to be not subject to any receipts
Contracting resistance guarantees the molding wide face flawless of base.
Further, the open-close type die casting machine is open-close type water cooled die casting machine, the adaptation range of steel billet is molded
For 500~550mm of thickness, 2.2~2.6m of width, 4.0~6.0m of length.
The preferred mode of the above solution is that keeping molten steel fast using circulating water crystallizer during being poured steel billet
Rapid hardening is solid, steel ingot casting complete after twenty minutes, using atomized water spray continue it is cooling until 500 DEG C hereinafter,
Atomisation pressure when wherein atomized water spray continues cooling is 6.0~6.5MPa.
Further, carried out in the steps below when hot forging heap cold treatment,
Steel ingot first is heated in 1240 DEG C of ± 10 DEG C of ranges, is dissolved alloying element sufficiently；Then high temperature heavy reduction is used
Three upsettings three pull out technique and forged, forging temperature controls between 1050~1200 DEG C, and final forging temperature is controlled 850~870
℃；Cold using heap after forging at air-cooled to 250 DEG C or less after forging, stack cold time acquires finished product thickness slab ingot in 24~38h,
Wherein, three upsettings three of high temperature heavy reduction are pulled out in technique, and the drafts of each passage is not less than 25%, pulling pressure
Amount is not less than 30%.
The preferred mode of the above solution is that the solution heat before forging is using hot sending temperature dress, charging temperature is greater than 250 DEG C.
Further,
Heat treatment after forging include with following step,
A, it heats: 850~900 DEG C of heating temperature, 8~15h of heating time,
B, quench: come out of the stove air-cooled 2~3min, 2~4min of misting cooling, and then water spray is cooled to 700 DEG C of surface temperature, then wind
Cold 2~3min then proceedes to water spray and is cooled to 400 DEG C, then air-cooled 3~5min, then proceedes to water spray and is cooled to 200 DEG C, is heat-treated out
Slot is air-cooled,
C, be tempered: 520~580 DEG C of tempering, 8~14h of tempering time, cross-section surface hardness are 43~48HRC.
The beneficial effects of the present invention are: the application by it is logical for it is a kind of include following parts by weight of component molding be hot-forged it is flat
Steel, i.e. C 0.25~0.45%, Si 0.30~0.70%, Mn 0.50~1.0%, Cr 1.30~2.0%, Mo 0.20~
0.50%, N 0.05~0.10%, Ti≤0.03%, B≤0.002%, Al≤0.02%, P≤0.015%, S≤0.005%,
Remaining is hot-forged band steel for the molding of Fe and other impurities element, and is smelted using molten steel optimization, the casting of open-close type die casting machine, hot forging
Heap cold treatment and the several steps of heat treatment complete the production of molding hot forging band steel, especially when molten steel optimizes and smelts, pass through
Micro Ti refinement crystal grain is added, micro B is added delays austenite-perlitic transformation incubation period in casting process, is opening and closing
It when formula die casting machine is poured, is poured using feeding pouring technology in low temperature rising pouring, molten steel is made to be not subject to any deflation resistance, guarantee mould
The wide face flawless of slab.To make the molding hot forging band steel of the said components using above-mentioned process production provided by the present application
Section hardness it is uniform as far as possible, and then improve the processing performance of the plastic mould thickness band steel, and show after mold is made
Write the performance for improving mold.
Specific embodiment
In order to solve the above technical problems existing in the prior art, a kind of processing performance provided by the invention is good, is made
The uniform plastic mould thickness band steel of the section hardness that the performance of mold significantly improves, and the production plastic mould thickness band steel
Process.The plastic mould thickness band steel be include following weight parts component molding hot forging band steel, C 0.25~
0.45%, Si 0.30~0.70%, Mn 0.50~1.0%, Cr 1.30~2.0%, Mo 0.20~0.50%, N 0.05~
0.10%, Ti≤0.03%, B≤0.002%, Al≤0.02%, P≤0.015%, S≤0.005%, remaining for Fe and other
Impurity element.The process includes that molten steel optimization smelts, the casting of open-close type die casting machine, is hot-forged heap cold treatment and heat treatment
Several steps, wherein when molten steel optimizes and smelts, micro Ti refines crystal grain, the micro B of addition delays casting process by being added
The incubation period of middle austenite-perlitic transformation is poured when open-close type die casting machine is poured using feeding pouring technology in low temperature rising pouring
Note makes molten steel be not subject to any deflation resistance, guarantees the molding wide face flawless of base.The application includes following by leading to for one kind
The molding of parts by weight of component is hot-forged band steel, i.e. C 0.25~0.45%, Si 0.30~0.70%, Mn 0.50~1.0%, Cr
1.30~2.0%, Mo 0.20~0.50%, N 0.05~0.10%, Ti≤0.03%, B≤0.002%, Al≤0.02%, P
≤ 0.015%, S≤0.005%, remaining for the molding of Fe and other impurities element be hot-forged band steel, and smelted using molten steel optimization,
The casting of open-close type die casting machine, hot forging heap cold treatment and the several steps of heat treatment complete the production of molding hot forging band steel, especially
When molten steel optimizes and smelts, by being added, micro Ti refines crystal grain, the micro B of addition delays austenite-pearly-lustre in casting process
The incubation period of body transformation is poured using feeding pouring technology in low temperature rising pouring in the casting of open-close type die casting machine, holds molten steel not
By any deflation resistance, guarantee the molding wide face flawless of base.To make using above-mentioned process production provided by the present application
The section hardness of the molding hot forging band steel of said components is uniform as far as possible, and then improves the processing of the plastic mould thickness band steel
Performance, and the performance that mold is significantly improved after mold is made.
In above embodiment, in order to guarantee mold blank slab quality, for it is postorder forge and heat treatment provide it is excellent
The blank of matter, the open-close type die casting machine be open-close type water cooled die casting machine, molding steel billet adaptation range be thickness 500~
550mm, 2.2~2.6m of width, 4.0~6.0m of length.During being poured steel billet, steel is made using circulating water crystallizer
Liquid quickly solidifies, steel ingot casting complete after twenty minutes, using atomized water spray continue it is cooling until 500 DEG C hereinafter, wherein atomized water spray after
Atomisation pressure when continuous cooling is 6.0~6.5MPa.
The quality of finished plastic Flat Die Steel is directly decide due to forging and being heat-treated, for this purpose, to be hot-forged heap cold by the application
It when processing, carries out in the steps below, first heats steel ingot in 1240 DEG C of ± 10 DEG C of ranges, be dissolved alloying element sufficiently；So
It pulls out technique using three upsettings three of high temperature heavy reduction afterwards to be forged, forging temperature controls the finish-forging between 1050~1200 DEG C
Temperature is controlled at 850~870 DEG C；Cold using heap after forging at air-cooled to 250 DEG C or less after forging, stack cold time is obtained in 24~38h
Obtaining finished product thickness slab ingot, wherein three upsettings three of high temperature heavy reduction are pulled out in technique, and the drafts of each passage is not less than 25%,
It pulls out drafts and is not less than 30%.And the solution heat before forging is greater than 250 DEG C using hot sending temperature dress, charging temperature.Accordingly
, heat treatment after forging include with following step,
A, it heats: 850~900 DEG C of heating temperature, 8~15h of heating time,
B, quench: come out of the stove air-cooled 2~3min, 2~4min of misting cooling, and then water spray is cooled to 700 DEG C of surface temperature, then wind
Cold 2~3min then proceedes to water spray and is cooled to 400 DEG C, then air-cooled 3~5min, then proceedes to water spray and is cooled to 200 DEG C, is heat-treated out
Slot is air-cooled,
C, be tempered: 520~580 DEG C of tempering, 8~14h of tempering time, cross-section surface hardness are 43~48HRC.
In conclusion the plastic mould thickness band steel of said components is processed using the above-mentioned process that this Shen provides, gram
Taken existing plastic die steel Heavy plate production there are the problem of, which passes through control using water mist cold molding thickness steel billet
Rolling, using rear waste heat, the cooling online pre-hardening of realization of control is rolled, then fire is retracted in nodularization, and then isothermal hardening-tempering, reaches
Pre-hardening treatment purpose is carried out to such steel.Due to containing more Cr, Mo alloying element makes it have good harden ability, In
Steel plate rolling terminates to enter the cold bed air-cooled stage, and surface is air-cooled to enter hardening phase.By reducing heating rate, improving samming
Temperature and extension equal temperature time facilitate alloying element component diffusion in austenite, improve the segregation of blank core.Using two
Secondary normalizing process can effectively improve steel plate segregation, and uniformity of hardness improves in uniform formation.
This process can not only reduce energy consumption, reduce pollution；And the uniformity of tissue and hardness can be improved
With the stability of heat treatment process.
Specific embodiment
A kind of uniform plastic die steel process for producing thick plate of section hardness, it is characterised in that the production technology moulds tradition
The ingredient of material mould steel optimizes adjustment, using the cooling die casting machine casting of open-close type water mist, reasonable heating cycle and forging
Technique simultaneously handles to obtain plastic mould steel thick plate by average tempering after processing, the specific steps are as follows:
1) the novel plastic mould steel after being optimized and revised on the component base of traditional moulds steel P20, is meeting
Under the premise of hardness, carbon amounts is suitably reduced, while trace Ti refinement crystal grain is added, micro B is added and improves harden ability, keeps section hard
It spends more uniform；The chemical component weight percentage of plastic die steel are as follows: C 0.25~0.45%, Si 0.30~0.70%, Mn
0.50~1.0%, Cr 1.30~2.0%, Mo 0.20~0.50%, N 0.05~0.10%, Ti≤0.03, B≤
0.002%, Al≤0.02%, P≤0.015%, S≤0.005%, remaining be Fe and other impurities element.
2) it is poured using open-close type die casting machine, using cast cold, the pouring technology of feeding in rising pouring, recirculated water cooling crystallization
Device solidifies molten steel quickly, and steel ingot casting after twenty minutes, continues cooling until 500 DEG C hereinafter, wherein molten steel is not using atomized water spray
Any deflation resistance is born, guarantees the molding wide face flawless of base；Wherein the spraying cold middle atomisation pressure is 5~8MPa；It is preferred that
For 6.2MPa.
3) determine that heating cycle in heating furnace, the heating temperature of steel ingot are no more than 1260 DEG C, are dissolved alloying element sufficiently；
Steel ingot is greater than 250 DEG C using hot sending temperature dress, charging temperature.Forging temperature is 1050-1200 DEG C, and the forging stage uses the big pressure of high temperature
Lower amount, forging process pull out technique using three upsettings three, and reduction in pass is greater than 25%, final forging temperature >=850 DEG C；It is air-cooled after forging,
Take heap after forging cold at 250 DEG C of temperature or less, stack cold time obtains finished product thickness slab ingot in 20~48h or so；
4) be heat-treated to steel plate: (a) 850~900 DEG C of heating temperature, 8~15h of heating time (b) are quenched: being come out of the stove
Air-cooled 2~3min, spraying cold 2~4min, then water spray is cooled to 700 DEG C of surface temperature, then air-cooled 2~3min, then proceedes to spray
Water cooling is to 400 DEG C, then air-cooled 3~5min, then proceedes to water spray and is cooled to 200 DEG C, heat treatment groove is air-cooled out；(c) it is tempered: 520~
580 DEG C of tempering, 8~14h of tempering time, cross-section surface hardness are 43~48HRC.
In step 2) of the present invention, cast cold can prevent column crystal coarse；Water cooling adds water mist cooling under circulation, is frozen into
Base forms thinner one layer of equiax crystal on surface, and surface quality is good；The circular arc that corner is equipped with for dispersive stress, obtained mould
Slab is without chink；Base Center Equiaxial Crystal rate >=30% is molded, visual shrinkage cavity is zero.In step 3), using suitable heating cycle,
Final forging temperature and offline temperature are controlled, online Pre-hardening treatment is realized using online air-cooled method；And pass through cycle heat treatment
Stress is eliminated, thick steel ingot section difference of hardness is reduced.
The present invention has carried out appropriate adjustment on the component base of traditional moulds steel P20, carbon to the obdurability of steel, hardness,
Wearability has decisive influence, and carbon amounts increases, and hardness, intensity and wearability increase, but toughness declines.In the premise for meeting hardness
Under, carbon amounts is suitably reduced, while trace Ti refinement crystal grain is added, micro B is added and improves harden ability, keeps section hardness more equal
It is even.Smelting chemical ingredient C, Cr, Mo, Mn must be controlled in very narrow range.
The present invention is deformed by controlled forge process, realizes online direct normalizing using waste heat, control cooling after forging, then medium temperature
Tempering reaches such steel and carries out Pre-hardening treatment purpose.
For the present invention when adding water mist die casting machine to be poured using open-close type water cooling, there is chink in molten steel stationary crystallization, no straightening
It is few with the chance of implosion.Rising pouring technique, field trash easily float.The circular arc that corner is equipped with for dispersive stress, circular arc R25mm,
Obtained molding base is without chink；Recirculated water cooling adds water mist crystallizer to keep molten steel crystallization rate fast, without 2 times and 3 Dendritic TiCs；Slab
Description adjustment replacement is easy, applied widely；High temperature release, conditions permit can be carried out, steel billet can realize hot sending, temperature dress；
Inner Quality of Billet is close with continuous casting billet, since without shake trace, chink and surface oxidation, surface quality are substantially better than continuous casting billet.
After the steel ingot of 120~360mm thickness is forged in the present invention and heat treatment, hardness number has a different, but generally with
The increase of steel plate thickness, hardness have downward trend.The edge hardness highest of same thickness steel plate, core hardness is minimum, and with steel
The reduction of plate thickness, difference of hardness reduce.The means heated by forging deformation, realization plastic mould structure of steel and hardness
The stability of uniformity and tempering heat treatment technique.
For the steel ingot specification of production up to 120~360mm thickness, tissue is tempered martensite and a small amount of bainite structure, In
This state has good obdurability and enough hardness, and hardness is between 43-48HRC.It is offline just by controlled rolling and controlled cooling substitution
Fire, can be energy saving, creates huge economic benefit and social benefit for enterprise.
Embodiment one
A kind of uniform plastic die steel thickness slab ingot production technology of section hardness, the production technology using suitable chemistry at
Set up meter, the casting of open-close type water cooled die casting machine separately, by directly returning after reasonable heating cycle and cooling controlling and rolling controlling process, controlled rolling and controlled cooling
Fire processing obtains section hardness uniform plastic's mold steel thick plate, the specific steps are as follows:
1) under the premise of meeting hardness, carbon amounts is suitably reduced, while trace Ti refinement crystal grain is added, micro B is added and prolongs
The incubation period of slow austenite-perlitic transformation, harden ability is improved, keeps section hardness more uniform.Smelting chemical ingredient C, Cr,
Mo, Mn must be controlled in very narrow range.Pre-hardening plastic die steel P20 chemical component weight percentage: C:0.30~
0.35%, Si:0.40~0.50%, Mn:0.65~0.80%, Cr:1.40~1.60%, Mo:0.30~0.45%, N 0.07
~0.10%, Ti:0.015~0.03, B≤0.002%, Al:0.018% or so, P≤0.010%, S≤0.003%, remaining
For Fe and other impurities element.
2) it is poured using open-close type die casting machine, using cast cold, the pouring technology of feeding in rising pouring, recirculated water cooling crystallization
Device solidifies molten steel quickly, and steel ingot casting after twenty minutes, continues cooling until 500 DEG C hereinafter, wherein molten steel is not using atomized water spray
Any deflation resistance is born, guarantees the molding wide face flawless of base；Wherein the spraying cold middle atomisation pressure is preferably 6.2MPa.Make
Open-close type water cooled die casting machine is suitble to be poured thickness 520mm, width 2.5m, the steel billet of length 4.0m range.
3) heating cycle in heating furnace is determined, 1240 DEG C ± 10 DEG C of the heating temperature of the range steel ingot fills alloying element
Divide solid solution；Steel ingot is greater than 250 DEG C using hot sending temperature dress, charging temperature.Forging temperature is 1080-1150 DEG C, and the forging stage uses
High temperature heavy reduction, forging process pull out technique using three upsettings three, and reduction in pass 27% pulls out drafts 30%, final forging temperature
850~870 DEG C；Air-cooled after forging, 250 DEG C of temperature or less whens, take heap after forging cold, and stack cold time is obtained in 24~38h or so
Finished product thickness slab ingot, embodiment specification 320mm*1300mm*2800mm；
4) steel plate is heat-treated: (a) 870 DEG C of heating temperature or so, heating time 10h, (b) quenches: coming out of the stove air-cooled
3min, spraying cold 3min, then water spray is cooled to 700 DEG C of surface temperature, then air-cooled 2min, then proceedes to water spray and is cooled to 400 DEG C, then
Air-cooled 4min then proceedes to water spray and is cooled to 200 DEG C, and heat treatment groove is air-cooled out；(c) it is tempered: 550 DEG C of tempering, tempering time 12h,
Cross-section surface hardness is 44~45.5HRC.
Steel plate tempering process: 550-580 DEG C of tempering temperature or so, soaking time 2.5min/mm.It is thermally treated to obtain performance
Qualified plastic die steel thickness slab ingot.The different parts in same section, after same circulating quenching, tempering temperature processing,
For hardness value difference than being obviously reduced before tempering, the core and edge hardness number of same steel plate are essentially identical, differ with section hardness
2HRC.With the raising of tempering temperature, hardness is reduced.
Studies have shown that pre-hardening plastic mould steel thick plate is after controlled rolling and controlled cooling and tempering, section hardness is uniform, average
Rockwell hardness is 43-45HRC, differs 2HRC with section hardness, room temperature ballistic work reaches 50J.Ultrasound examination passes through GB/
I grades of T2970-2004 standard, inclusion behavior is lower, and 100mm thick steel plate grain size is 8.5 grades, good combination property.
Claims (7)
1. a kind of uniform plastic mould thickness band steel of section hardness, it is characterised in that: the plastic mould thickness band steel be comprising
There is the molding hot forging band steel of following weight parts component,
C 0.25~0.45%, Si 0.30~0.70%, Mn 0.50~1.0%, Cr 1.30~2.0%, Mo 0.20~
0.50%, N 0.05~0.10%, Ti≤0.03%, B≤0.002%, Al≤0.02%, P≤0.015%, S≤0.005%,
Remaining is Fe and other impurities element.
2. a kind of process for producing plastic mould thickness band steel described in claim 1, it is characterised in that: the process
It smelted including molten steel optimization, the casting of open-close type die casting machine, be hot-forged heap cold treatment and the several steps of heat treatment,
Wherein, when molten steel optimizes and smelts, delayed by the micro Ti refinement crystal grain of addition, the micro B of addition difficult to understand in casting process
Family name's body-perlitic transformation incubation period,
It when open-close type die casting machine is poured, is poured using feeding pouring technology in low temperature rising pouring, molten steel is made to be not subject to any contraction resistance
Power guarantees the molding wide face flawless of base.
3. process according to claim 2, it is characterised in that: the open-close type die casting machine is open-close type water cooled mo(u)ld
Casting machine, the adaptation range of molding steel billet are 500~550mm of thickness, 2.2~2.6m of width, 4.0~6.0m of length.
4. process according to claim 3, it is characterised in that: during being poured steel billet, using recirculated water cooling
But crystallizer solidifies molten steel quickly, steel ingot casting complete after twenty minutes, using atomized water spray continue it is cooling until 500 DEG C hereinafter,
Atomisation pressure when wherein atomized water spray continues cooling is 6.0~6.5MPa.
5. process according to claim 2, it is characterised in that: be to carry out in the steps below when hot forging heap cold treatment
,
Steel ingot first is heated in 1240 DEG C of ± 10 DEG C of ranges, is dissolved alloying element sufficiently；Then the three of high temperature heavy reduction is used
Upsetting three is pulled out technique and is forged, and forging temperature controls between 1050~1200 DEG C, and final forging temperature is controlled at 850~870 DEG C；Forging
Cold using heap after forging when making latter air-cooled to 250 DEG C or less, stack cold time acquires finished product thickness slab ingot in 24~38h,
Wherein, three upsettings three of high temperature heavy reduction are pulled out in technique, and the drafts of each passage is not less than 25%, and pulling drafts is not
Lower than 30%.
6. process according to claim 5, it is characterised in that: the solution heat before forging enters furnace using hot sending temperature dress
Temperature is greater than 250 DEG C.
7. process according to claim 2, it is characterised in that: heat treatment after forging include with following step,
A, it heats: 850~900 DEG C of heating temperature, 8~15h of heating time,
B, quench: come out of the stove air-cooled 2~3min, 2~4min of misting cooling, and then water spray is cooled to 700 DEG C of surface temperature, then air-cooled 2
~3min then proceedes to water spray and is cooled to 400 DEG C, then air-cooled 3~5min, then proceedes to water spray and is cooled to 200 DEG C, heat treatment groove is empty out
It is cold,
C, be tempered: 520~580 DEG C of tempering, 8~14h of tempering time, cross-section surface hardness are 43~48HRC.
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