CN104911321B - Extra-thick steel plate production process of plastic dies steel - Google Patents
Extra-thick steel plate production process of plastic dies steel Download PDFInfo
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Abstract
The invention relates to an extra-thick steel plate production process of plastic die steel. The maximum thickness of the die steel can achieve 250mm. The production process comprises the following steps: adopting a proper composition design to produce the die steel belonging to middle-carbon high-alloy steel, performing steelmaking in a converter, continuously casting to form the material through a phi1000mm round billet, and obtaining a pre-hardened plastic die thick steel plate with excellent internal quality and good processing performance through a reasonable heating mode, a rolling technology and a heat-treating system. The steel plate is uniform in tissue, uniform in performance, and capable of achieving JB/4730.3-2005 standard I level, low in occluded foreign substance, and good in steel plate processing performance.
Description
Technical field
The present invention relates to steel billet aftertreatment technology is and in particular to a kind of given birth to using the special thickness plastic die steel that large round billet is become a useful person
Production. art.
Background technology
Advancing by leaps and bounds with plastics industry, the demand of plastic die steel sharply increases, wherein pre-hardening type plastics
Mould steel market demand is larger.Due to pre-hardened plastic mold steel just reach when producer supplies hardness required by user and
Serviceability, after user obtains material, directly can be processed into mould it is not necessary to carry out quenching, tempering heat treatment just can be straight
Connect use, this kind of steel avoid carry out again quenching after mould processing, the deformation caused by tempering heat treatment operation, cracking,
The defects such as decarburization, have the advantages of good obdurability, cutting ability and polishing performance, dimensional accuracy, pre-hardening type plastics simultaneously
Mould steel is suitable to manufacture complex-shaped, accurate mould of plastics, and cost performance is higher.
Plastic increasingly develops to large-scale, complicated, accurate direction, such as washing machine cylinder, electric refrigerator inner chamber, large-scale coloured silk
Electric shell etc..Size in order to adapt to plastic maximizes increasingly, the complication of shape, and the requirement to plastic die steel is also got over
Come stricter, wish that material has good machinability while wishing the increase of Steel for Plastic Die specification, minute surface is thrown
Photosensitiveness etc..
Plastic steel plate for die dog-eat-dog on domestic market, but steel plate thickness concentrates on below 120mm, many enterprises
Industry is set about in refining steel and rolled steel, and attempt optimizes quality of materials, improves product competitiveness, but eventually because thick by continuous casting steel billet
The restriction of degree, can not produce that thickness is bigger and the excellent plastic die steel steel plate of internal soundness.
For mould of plastics slab, become a useful person due to continuous casting steel billet and lead to compression ratio not, the deformation of blank internal penetration less than
Position so that internal quality of steel plate it cannot be guaranteed that, sand holes, loose defect easily occur.The patent No. 201010266549.7 is developed
" open-close type water cooled die casting machine teeming become a useful person technique " so that the quality of mould of plastics steel thick plate is improved, but
This process costs is higher, complex procedures, and the production cycle is longer.Domestic at present have some enterprises to take traditional ingot casting to become a useful person work
Skill, leads to lumber recovery low because ingot casting rising head position is of poor quality, and this technique mould consumption is high, and casting is difficult, because solidification of molten steel is led slowly
Cause the defects such as shrinkage cavity, segregation, the surface of steel plate of roll forming and core hardness difference big, the following process of impact client.
Content of the invention
The technical problem to be solved is to provide a kind of special heavy plate of plastic die steel for above-mentioned prior art
And its production technology, become a useful person with continuous casting ф 1000mm large round billet, by optimizing rational heating, rolling, Technology for Heating Processing, improve
The internal soundness of plastic die steel special heavy plate, steel plate has more preferable uniformity of hardness, the modern designs of plastics while obtaining bigger thickness
The thickness of tool steel can reach 250mm.Overcome that existing " rolling of molding-ingot formation-reversible mill or ingot casting forging are become a useful person work
The problems such as casting of skill " is difficult, mould consumption is high, lumber recovery is low, relatively costly, complex procedures, production cycle are longer, especially improves into
Material rate.
The present invention the adopted technical scheme that solves the above problems is to provide a kind of special heavy plate of mould of plastics to produce work
Skill, specifically comprises the following steps that
Become a useful person with continuous casting ф 1000mm large round billet, using straight arc conticaster continuous casting φ 1000mm large round billet, cutting on line becomes
The blank of certain length.Control 10～20 DEG C of molten steel overheat, realize low overheat continuous casting, stirring molten steel is installed in crystallizer
Electromagnetic mixing apparatus, using electromagnetic stirring equipment, contribute to the timely heat release of molten steel, reduce blank inside and outside temperature difference, contribute to disappearing
Except crystallizer surface molten steel solidification encrustation phenomena；Two cold-zone arrangement atomization water-cooling apparatus, by spraying atomization to blank surface
Water cooling, is conducive to blank surface uniform decrease in temperature, improves surface quality；Molten steel solidification end adopt electromagnetic agitating technology and
Dynamic soft reduction technology, slows down oval blank core and shrinks the hole defect producing and segregation phenomena because of molten steel solidification, improve
Blank internal soundness.
(1) continuous casting gained blank heat delivers to soaking pit, sets charging temperature as 600 ± 10 DEG C；If not possessing heat to send condition,
Soaking pit will be delivered to again, pad hot base in burial pit bottom makes hole temperature be maintained above 50 DEG C, and blank outer layer adds a cover stone after blank slow cooling
Cotton, then covers insulation cover, slow cooling 24～48h, and blank goes out to cheat surface temperature control at 200～250 DEG C, to entering to cheat slow cooling
Blank, sets charging temperature and is not less than 150 DEG C；
(2) heat, the programming rate of setting stepwise soaking pit :≤1000 DEG C, programming rate is 80～100 DEG C/h；＞
1000 DEG C, 50～70 DEG C/h of programming rate；1280 DEG C of maximum heating temperature, 1260 ± 10 DEG C of soaking temperature, this heating and thermal insulation side
Formula is able to ensure that the abundant solid solution of the alloying element of this composition blank, and ensure autstenitic grain size thick not too much it is ensured that oval
Homogeneous grain size inside and outside blank, eliminates as much as the metallographic difference of thickness direction；
(3) roll, using shaped blank rolling mill practice, design " axial rolling → angular rolling → transverse rolling → axial rolling " technological process, open rolling
1050～1100 DEG C of temperature, steel plate rolling adopts the big soft reduction process of low speed to roll, and rolling large deformation is able to ensure that oval base rolling
Deformation can penetrate into strand core, to eliminate the uneven deformation on thickness direction as much as possible；Axial rolling rank before angular rolling
Section draught per pass 60～90mm, front four-pass depresses total amount >=300mm, and the 5th to the tenth passage adopts 15 ° of angular rolling techniques
Carry out blank broadening, finishing temperature >=900 DEG C；
(4) slow cooling, after the completion of rolling, blank is air cooled to 300 ± 50 DEG C, and steel plate arrangement pitch >=1.5m is then offline
Heap slow cooling, heap temperature retention time >=48h；
(5) normalizing+tempering heat treatment, preferably car type furnace carry out normalizing+tempering heat treatment to steel plate, and car type furnace space is little,
Internal temperature is uniform；Steel plate heats up with stove, contributes to slowing down steel plate thermal stress it is ensured that steel plate template；Car type furnace adopts blast furnace coal
Gas heats, and can reduce production cost, 850～880 DEG C of normalizing temperature, temperature retention time 2～4min/mm, and temperature 550～
600 DEG C, temperature retention time 3.5～4.5min/mm, obtain pre-hardening type mould of plastics special heavy plate, normalizing contributes to slowing down mould of plastics
The internal segregation of special heavy plate, uniform steel sheet is organized, and reduces with plate different place difference of hardness.
Preferably, in step (1), behind blank hole from burial pit, blank surface is carried out carrying temperature detector to look into, defect is carried out
Band temperature cleaning, scafing temperature >=150 DEG C, eliminate blank surface defect, improve product surface quality.
Further, 3～5 sub-high pressure water de-scalings are adopted in the operation of rolling it is ensured that plate surface quality；Rolled using edger roll
System is it is ensured that quality of edges；Suitably increase by 2～3 planishing passes in the operation of rolling it is ensured that steel plate unevenness≤3mm/m, with further
Improve the flatness of steel plate and surface quality it is ensured that surface of steel plate flawless, scabbing, bubble, defect, be mingled with or pit, rolling
The straight of steel plate is can ensure that during system.
Above-mentioned technique especially adapt in carbon alloy mould steel plate production, by mass percentage, c:0.38 in steel plate～
0.42%, si:0.20～0.40%, mn:1.40～1.60%, cr:1.80～2.00%, mo:0.18～0.25%, als:0.01～
0.04%, p≤0.015%, s≤0.005%, remaining is fe and inevitable impurity.
The present invention has a characteristic that
Prehardening plastic die of the present invention belongs to medium carbon alloy steel, and crackle is very sensitive, easily produces center portion and table
Facial cleft stricture of vagina.For producing tissue change stress because rate of cooling is too fast after avoiding continuous casting φ 1000mm large round billet offline, lead to blank
There is micro-crack, strand first-selection hot delivery and hot charging in inside, if not possessing hot delivery and hot charging condition, strand must accomplish that under high temperature, hole is slow
Cold, and set the appearance to prevent crackle for the specific slow cooling condition.
The present invention is heated to large round billet using soaking pit, high insulating effect, and in-furnace temperature is uniform.
The present invention adopts shaped blank rolling mill practice, and steel plate rolling adopts the rolling of low speed big soft reduction process it is ensured that rolling deformation
Strand core can be penetrated into, eliminate final gained steel plate difference in a thickness direction it is ensured that uniform texture, be somebody's turn to do
Technique is capable of the rolling of big thickness steel plate.
Compared with prior art, it is an advantage of the current invention that: the special thickness plastic steel plate for die that involved technique obtains, produce
Low cost, production efficiency is high, with short production cycle, and relatively " molding-ingot formation-reversible mill rolling or ingot casting forge work of becoming a useful person
The plastic steel plate for die that skill " produces, is greatly improved lumber recovery, reduces production cost.
The special thickness plastic steel plate for die that the present invention produces, maximum gauge reaches 250mm, steel plate even tissue, and performance is homogeneous, warp
Ultrasound examination reaches jb/4730.3-2005 standard level, and inclusion behavior is low, and steel plate processing characteristics is good.
Brief description
Fig. 1 be the embodiment of the present invention in pre-hardening type mould of plastics special heavy plate along thickness of slab direction surface tissue morphology figure；
Fig. 2 is for pre-hardening type mould of plastics special heavy plate in the embodiment of the present invention along the tissue morphology figure at thickness of slab direction 1/4；
Fig. 3 is for pre-hardening type mould of plastics special heavy plate in the embodiment of the present invention along the tissue morphology figure at thickness of slab direction 1/2.
Specific embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
A kind of special heavy plate production technology of plastic die steel, mould steel maximum gauge can reach 250mm, this production technology
Using suitable composition design, belong to medium carbon alloy steel, the chemical composition of steel plate be by mass percentage c:0.38～
0.42%, si:0.20～0.40%, mn:1.40～1.60%, cr:1.80～2.00%, mo:0.18～0.25%, als:0.01～
0.04%, p≤0.015%, s≤0.005%, remaining is fe and inevitable impurity.Pneumatic steelmaking, with φ 1000mm large round billet
Continuous casting material-forming, obtains by rational mode of heating, rolling mill practice and heat treating regime that internal soundness is excellent, and processing characteristics is good
Good pre-hardening type mould of plastics special heavy plate.Concrete technology step is as follows:
Using straight arc conticaster continuous casting φ 1000mm large round billet, cutting on line become 2000mm about blank.Control molten steel
10～20 DEG C of the degree of superheat, realizes low overheat continuous casting, installs the electromagnetic mixing apparatus of stirring molten steel, stirred using electromagnetism in crystallizer
Mixing equipment, contributes to the timely heat release of molten steel, reduces blank inside and outside temperature difference, contributes to eliminating crystallizer surface molten steel solidification crust
Phenomenon；Two cold-zone arrangement atomization water-cooling apparatus, by spraying atomization water cooling to blank surface, are conducive to blank surface uniform
Cooling, improves surface quality；Adopt electromagnetic agitating technology and dynamic soft reduction technology in molten steel solidification end, slow down oval base
Material core shrinks the hole defect producing and segregation phenomena because of molten steel solidification, improves blank internal soundness.
(1) continuous casting gained blank is preferably and intermittent fever delivers to soaking pit, sets charging temperature as 600 ± 10 DEG C；If not possessing
Heat send condition, will deliver to soaking pit after blank slow cooling again, and pad hot base in burial pit bottom makes hole temperature be maintained above 50 DEG C, outside blank
Layer adds a cover asbestos cloth, then covers insulation cover, slow cooling 24～48h, blank goes out to cheat surface temperature control at 200～250 DEG C, blank
Behind hole from burial pit, blank surface is carried out carrying temperature detector to look into, defect is carried out carry temperature to clear up, scafing temperature >=150 DEG C,
Eliminate blank surface defect, improve product surface quality, to entering to cheat the blank of slow cooling, set charging temperature and be not less than 150 DEG C；
(2) heat, the programming rate of setting stepwise soaking pit :≤1000 DEG C, programming rate is 80～100 DEG C/h；＞
1000 DEG C, 50～70 DEG C/h of programming rate；1280 DEG C of maximum heating temperature, 1260 ± 10 DEG C of soaking temperature, this heating and thermal insulation side
Formula is able to ensure that the abundant solid solution of the alloying element of this composition blank, and ensures that autstenitic grain size is thick not too much；
(3) roll, using shaped blank rolling mill practice, design " axial rolling → angular rolling → transverse rolling → axial rolling " technological process, open rolling
1050～1100 DEG C of temperature, steel plate rolling adopts the big soft reduction process of low speed to roll, and rolling large deformation is able to ensure that oval base rolling
Deformation can penetrate into strand core, to eliminate the uneven deformation on thickness direction as much as possible；Axial rolling rank before angular rolling
Section draught per pass 60～90mm, front four-pass depresses total amount >=300mm, and the 5th to the tenth passage adopts 15 ° of angular rolling techniques
Carry out blank broadening, finishing temperature >=900 DEG C；3～5 sub-high pressure water de-scalings are adopted it is ensured that plate surface quality in the operation of rolling；
Using edge rolling it is ensured that quality of edges；Suitably increase by 2～3 planishing passes in the operation of rolling it is ensured that steel plate unevenness≤3mm/
M, to improve flatness and the surface quality of steel plate further；
(4) slow cooling, after the completion of rolling, blank is air cooled to online 300 ± 50 DEG C, steel plate arrangement pitch >=1.5m, then
Offline heap slow cooling, heap temperature retention time >=48h；
(5) normalizing+tempering heat treatment, carries out normalizing+tempering heat treatment using car type furnace to steel plate, and normalizing temperature 850～
880 DEG C, temperature retention time 2min/mm, 550～600 DEG C of temperature, temperature retention time 3.5min/mm, normalizing contributes to slowing down plastics
The internal segregation of mould special heavy plate, uniform steel sheet is organized, and reduces with plate different place difference of hardness, obtains pre-hardening type mould of plastics special thick
Plate.
The sand holes being visible by naked eyes after the pre-hardening type mould of plastics slab sawing of above-mentioned technique productions.Steel plate appearance surfaces light
Clean, flawless, scab, bubble, fold, be mingled with, the defect such as pit.As shown in Figure 1 to Figure 3, it is mould special heavy plate different-thickness
The metallographic structure at place, special heavy plate tissue is uniform in a thickness direction, is tempering bainite tissue.Special heavy plate structure segregation is little, cuts
Surface hardness is evenly distributed, and imposite difference of hardness is less than 2hrc, and machinability is good, and polishing performance is excellent.Special heavy plate is maximum thick
Degree reaches 250mm, and flaw detection meets jb/4730.3-2005 standard level, checks field trash according to astm e45 (a method), is mingled with
The total rank of thing is not more than 2.5 grades, and combination property is good.Using this technique productions special thickness pre-hardening type mould of plastics thickness steel, lumber recovery
Up to more than 88%, than molding become a useful person technique improve 8～11%, ton steel production cost reduce by more than 600 yuan.
Claims (9)
1. a kind of plastic die steel special heavy plate production technology it is characterised in that: become a useful person with continuous casting ф 1000mm large round billet, step
Including
(1) continuous casting gained blank heat delivers to soaking pit, sets charging temperature as 600 ± 10 DEG C；If not possessing heat to send condition, by base
Soaking pit is delivered to again, pad hot base in burial pit bottom makes hole temperature be maintained above 50 DEG C, and blank outer layer adds a cover asbestos cloth after material slow cooling,
Then insulation cover, slow cooling 24～48h are covered, blank goes out to cheat surface temperature control at 200～250 DEG C, to entering to cheat the blank of slow cooling,
Set charging temperature and be not less than 150 DEG C；
(2) heat, setting stepwise programming rate :≤1000 DEG C, programming rate is 80～100 DEG C/h；1000 DEG C of ＞, heat up speed
50～70 DEG C/h of degree；1280 DEG C of maximum heating temperature, 1260 ± 10 DEG C of soaking temperature；
(3) roll, adopt " axial rolling → angular rolling → transverse rolling → axial rolling " technological process, 1050～1100 DEG C of start rolling temperature, steel plate rolls
, using the rolling of low speed big soft reduction process, the axial rolling stage draught per pass 60～90mm before angular rolling, front four-pass pressure is total for system
Amount >=300mm, the 5th to the tenth passage carries out blank broadening, finishing temperature >=900 DEG C using 15 ° of angular rolling techniques；
(4) slow cooling, after the completion of rolling, blank is air cooled to 300 ± 50 DEG C, steel plate spacing >=1.5m, then offline heap slow cooling, heap
Temperature retention time >=48h；
(5) normalizing+tempering heat treatment, 850～880 DEG C of normalizing temperature, temperature retention time 2～4min/mm, temperature 550～600
DEG C, temperature retention time 3.5～4.5min/mm, obtain pre-hardening type mould of plastics special heavy plate.
2. plastic die steel according to claim 1 special heavy plate production technology it is characterised in that: described ф 1000mm is big
Round billet carries out continuous casting using straight arc conticaster, and using Prepared by Low Superheat Pouring, molten steel overheat is 10～20 DEG C, configuration in crystallizer
The electromagnetic mixing apparatus of stirring molten steel are to reduce blank internal-external temperature difference；Two cold-zone arrangement atomization water-cooling apparatus enter to blank surface
Row atomization water-cooled；Adopt electromagnetic agitation and dynamic soft-reduction technique in molten steel solidification end.
3. plastic die steel according to claim 1 special heavy plate production technology it is characterised in that: step (5) adopts platform
Car stove carries out normalizing+tempering heat treatment to steel plate.
4. plastic die steel according to claim 1 special heavy plate production technology it is characterised in that: in step (1), blank
Behind hole from burial pit, blank surface band temperature detector is looked into, defect is carried out carry temperature cleaning, scafing temperature >=150 DEG C.
5. plastic die steel according to claim 1 special heavy plate production technology it is characterised in that: in the operation of rolling adopt
3～5 sub-high pressure water de-scalings are it is ensured that plate surface quality.
6. plastic die steel according to claim 1 special heavy plate production technology it is characterised in that: the operation of rolling is using vertical
Rolling system is it is ensured that quality of edges.
7. plastic die steel according to claim 1 special heavy plate production technology it is characterised in that: in the operation of rolling suitably
Increase by 2～3 passage flattening process it is ensured that steel plate unevenness≤3mm/m.
8. the special heavy plate production technology of the plastic die steel according to any claim in claim 1 to 7, its feature exists
In: the thickness of gained pre-hardening type mould of plastics special heavy plate reaches 250mm.
9. the special heavy plate production technology of the plastic die steel according to any claim in claim 1 to 7, its feature exists
In: gained pre-hardening type mould of plastics special heavy plate is medium carbon alloy steel, by mass percentage, and c:0.38～0.42% in steel, si:
0.20～0.40%, mn:1.40～1.60%, cr:1.80～2.00%, mo:0.18～0.25%, als:0.01～0.04%, p≤
0.015%, s≤0.005%, remaining is fe and inevitable impurity.
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| CN105624571B (en) * | 2016-03-10 | 2017-07-21 | 山东钢铁股份有限公司 | A kind of super-thick steel plate and its production technology |
| CN105925889A (en) * | 2016-06-30 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | Ultrathick specification 1.2311 mold steel plate and preparation method thereof |
| CN106513611A (en) * | 2016-10-17 | 2017-03-22 | 江阴兴澄特种钢铁有限公司 | Continuous casting process for producing 450mm extremely-thick plate blank on straight arc-shaped continuous casting machine |
| CN108043878A (en) * | 2017-11-06 | 2018-05-18 | 江阴兴澄特种钢铁有限公司 | A kind of method that high flaw detection of ellipse continuous casting billet production requires plastic mould steel thick plate |
| CN109664002A (en) * | 2019-01-03 | 2019-04-23 | 南京钢铁股份有限公司 | A kind of method of scafing plastic mould steel blank |
| CN109722509B (en) * | 2019-01-28 | 2020-11-03 | 舞阳钢铁有限责任公司 | Method for reducing surface hardness of 12Cr2Mo1R steel plate in normalized and tempered states |
| CN110539140B (en) * | 2019-09-06 | 2021-01-08 | 鞍钢股份有限公司 | Production method of super-thick steel plate for pre-hardened plastic mold |
| CN111321337B (en) * | 2020-02-27 | 2021-02-26 | 江阴兴澄特种钢铁有限公司 | Pre-hardened mirror surface die steel plate and manufacturing method thereof |
| CN113522970A (en) * | 2020-04-21 | 2021-10-22 | 宝山钢铁股份有限公司 | Production method of high-surface-quality hot-rolled steel |
| CN112853363A (en) * | 2021-01-04 | 2021-05-28 | 安徽黄山恒久链传动有限公司 | Processing technology of high-strength die steel |
| CN113265575B (en) * | 2021-04-26 | 2022-10-25 | 日钢营口中板有限公司 | Preparation method of extra-thick Mn-Cr series die steel |
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