CN104988434B - A kind of production technology of sulfur-bearing mould of plastics steel thick plate - Google Patents
A kind of production technology of sulfur-bearing mould of plastics steel thick plate Download PDFInfo
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Abstract
The present invention relates to a kind of sulfur-bearing mould of plastics steel thick plate, its thickness can reach 200mm, overcome Segregation of Sulphides in existing sulfur-bearing mould steel thick plate serious, the problems such as steel plate internal defect, the production technology of the sulfur-bearing mould of plastics steel thick plate is separately provided, become a useful person with 450mm thickness continuous casting billet, by rational heating cycle, rolling mill practice, heat treating regime, the sulfur-bearing mould of plastics steel thick plate of acquisition is made to have preferable internal soundness, nothing sand holes, the Defect Equivalent flaw detection that Φ 2.0mm can be met is required, require compared with 4730.3 2005 grades of non-destructive testing standards of JB/T more strict, steel plate even tissue, with plate difference of hardness within 2.0HRC.
Description
Technical field
The present invention relates to mould of plastics steel thick plate and smelting process, and in particular to a kind of utilization thick stock become a useful person containing thioplast
Mould steel thick plate and its production technology.
Background technology
With the fast development of plastics industry, plastics forming with the mould output value industry prosperity country in mould industry
Account for the first in the gross output value.In order to improve the machinability energy of plastic die steel, in steel, often add Cutting free element.Mesh
Before, the industrial level developed country such as the U.S., Germany, Japan has all developed some easy-cutting die steels, domestic Cutting free the modern designs of plastics
Tool steel is mainly S system and S-Se system, but as Se is expensive, S series free-cutting steel occupies leading position in the market.According to
Statistics sulphur free-cutting steel accounts for the ratio of China's automatic steel total output and reaches 90%.
Plastic products increasingly keep the large-scale development, and such as large-scale colour TV, refrigerator inner chamber etc., in order to adapt to this trend, state
Some steel enterprises interior go out some sulfur-bearing easy cutting plastic mold steel slabs by molding process exploitation of becoming a useful person, but cost is too high, mould
Have this hope of processing enterprise by reducing machining expense so as to expand economic benefit, but as sulfur-bearing plastic die steel is thick
The cost of plate is too high and loses more than gain.
Sulfur-bearing easy cutting plastic mold steel has good machinability when low, middling speed is cut, but increases in section
When, the segregation of sulfide can be more serious, and easily because segregation causes the flaw detection of steel plate not conform to, therefore in exploitation thickness specification relatively
During big sulfur-bearing plastic die steel, the tackling key problem to Segregation of Sulphides is a great problem.
For sulfur-bearing mould of plastics slab, often due to drafts not enough causes blank internal modification not in place, in steel plate
Portion's quality is loose, and therefore in the larger steel plate containing thioplast of exploitation thickness specification, the tackling key problem to rolling mill practice is another disaster
Topic.
" a kind of production method of easy cutting plastic mold steel plate " that the patent No. 201310569068.7 is applied, with 300mm
Continuous casting steel billet is become a useful person and develops the thick sulfur-bearing easy cutting plastic mold steel plate of thickness≤120mm, and excellent performance, flaw detection reach GB/T
2970 standard level levels, but the limitation of invar plate thickness specification eventually, can not meet the market demand.
Content of the invention
The technical problem to be solved is to overcome heavy in section sulfur-bearing mould of plastics steel thick plate sulfuration in prior art
Thing segregation is serious, the problems such as steel plate internal defect, provides a kind of sulfur-bearing mould of plastics steel thick plate and production technology, thick with 450mm
Continuous casting billet is become a useful person, and by rational heating cycle, rolling mill practice, heat treating regime, makes the sulfur-bearing mould of plastics steel thick plate of acquisition
With preferable internal soundness, nothing sand holes, the Defect Equivalent flaw detection that can meet Φ 2.0mm is required, steel plate even tissue, same to plate
Difference of hardness is within 2.0HRC.
The present invention the adopted technical scheme that solves the above problems is, a kind of sulfur-bearing mould of plastics steel thick plate, chemical composition
It is by mass percentage, C：0.35～0.45%, Si：0.30～0.50%, Mn：1.40～1.60%, Cr：1.80～2.00%,
Mo：0.18～0.25%, Ti：0.008～0.015%, S：0.05～0.10%, P≤0.015%, remaining is for Fe and inevitably
Impurity, the thickness of the steel plate can reach 200mm.
The present invention another object is that the special heavy plate production technology for providing a kind of mould of plastics, comprise the following steps that：
（1）Smelting molten steel, molten steel successively through converter smelting, LF refining and RH vacuum outgas, LF refining process is using precipitation
The mode that deoxidation and diffusive deoxidation combine is carrying out deoxidation：Ferrosilicon is added in molten steel and carry out precipitating with the carborundum for becoming bag and take off
Oxygen, is diffused deoxidation using the thin silicon carbide powder that floats, is finely adjusted sulphur after RH vacuum outgas, carry out calcium to slag surface
Process, change the form of sulfide, the Ti-Fe line of feeding, it is ensured that grain size and optimizing surface quality；
（2）Continuous casting, the degree of superheat of Pouring control molten steel is 15～25 DEG C, using Tundish Heating, joins in crystallizer
The electromagnetic mixing apparatus of stirring molten steel are put to reduce blank internal-external temperature difference, two cold-zones arrangement atomization water-cooling apparatus is to blank surface
Atomization water-cooled is carried out, is conducive to blank surface uniform decrease in temperature, surface quality is improved, electromagnetic agitation is adopted in molten steel solidification end,
Slow down blank segregation phenomena, then coordinate dynamic soft-reduction technique, dynamic soft-reduction controls blank drafts >=10mm, obtain
The continuous casting billet of 450mm or more；
（3）Slow cooling, continuous casting billet cutting on line, offline enter to cheat heap slow cooling or covering heap slow cooling, slow cooling more than 48 hours, blank
When playing hole or going out cover, surface temperature control is at 200～250 DEG C；
（4）Heating, blank band temperature shove charge, charging temperature are not less than 150 DEG C, continuous oven setting stepwise programming rate：≤
1000 DEG C, programming rate is 80～100 DEG C/h；1000 DEG C of ＞, 50～70 DEG C/h of programming rate；1250 ± 10 DEG C of soaking temperature,
1280 DEG C of maximum heating temperature；
（5）Rolling, using the big pressure rolling mill practice of low speed, first three adds up drafts >=150mm to four-pass, sets open rolling
1100～1150 DEG C of temperature, finishing temperature >=950 DEG C, control steel rolling deformation temperature between 1000～1150 DEG C, the operation of rolling
In adopt 2～3 sub-high pressure water de-scalings, it is ensured that plate surface quality, rolling terminate before increase by 2～3 planishing passes, it is ensured that steel plate is not
Pingdu≤3mm/m, improves the flatness of steel plate and surface quality further, it is ensured that surface of steel plate flawless, scabs, bubble, lack
Falling into, being mingled with or pit, the straight of steel plate is can ensure that in the operation of rolling；
（6）Slow cooling, offline heap slow cooling after the completion of rolling；
（7）Normalizing+tempering heat treatment, 860 ± 10 DEG C of normalizing temperature, 2～4min/mm of temperature retention time, tempering process according to
The thickness of steel plate sets：Thickness≤100mm steel plate, 580 ± 5 DEG C of temperature, time inside furnace are 4.0min/mm；Thickness G T.GT.GT
100mm steel plate, 570 ± 5 DEG C of temperature, time inside furnace be 4.0min/mm, it is ensured that all specification steel plates 30～36HRC it
Interior；
（8）Flaw detection, is detected a flaw according to the Defect Equivalent flaw detection requirement of φ 2.0mm, is visited compared with JB/T 4730.3-2005 level
Hinder standard and require more strict, qualified i.e. acquisition sulfur-bearing mould of plastics steel thick plate finished product.
Preferably, step（7）Normalizing+tempering heat treatment is carried out using car type furnace to steel plate, car type furnace space is little, internal temperature
Degree is uniform；Steel plate is heated up with stove, contributes to slowing down steel plate thermal stress, it is ensured that steel plate template；Car type furnace adopts BF gas heating,
Production cost can be reduced.
Preferably, step（3）In, blank is looked into blank surface band temperature detector after cheating from burial pit, carries out band temperature to defect
Cleaning, eliminates blank surface defect, improves product surface quality.
Further, step（3）Described in the hot base of burial pit bottom pad make hole temperature be maintained above 150 DEG C, blank is piled
Outer layer adds insulation cover afterwards；For covering heap slow cooling blank, it is desirable to which in cover, remaining space is little, it is to avoid too fast radiating, using the slow cooling
Mode can optimize the internal and surface quality of continuous casting material, contribute to eliminating open defect.
The present invention has following features：
Aluminium deoxidation is not used during smelting molten steel, it is to avoid CaO-Al2O3Non-metallic inclusion is precipitated at the mouth of a river, is caused
Nozzle blocking, affects the normal operation of continuous casting.0.008 ~ 0.015% titanium is added in steel grade design, plays crystal grain thinning, excellent
Change the effect of surface quality of continuously cast slab.
The sulfur-bearing mould of plastics steel thick plate of the present invention is carbon high-alloy steel in middle sulphur, and crack sensitivity is strong, surface quality control
Difficulty processed is big.For avoid 450mm thickness continuous casting steel billet cool down offline too fast cause crackle, strand must accomplish under high temperature hole slow cooling or
Person's covering heap slow cooling, burial pit bottom will be padded hot base and be ensured hole temperature more than 150 DEG C, and blank is piled rear appearance and need to add insulation cover, right
In covering heap slow cooling blank, it is desirable to which in cover, remaining space is little, it is to avoid radiating is too fast.Play hole or go out cover Preform surface temperature 200～
250 DEG C, band temperature detector looks into blank surface quality, if defective need band temperature cleaning.So that it is guaranteed that carbon high-alloy steel in flowing in this
Surface quality.
The present invention adopts the big pressure rolling mill practice of low speed, it is ensured that rolling deformation can penetrate into strand core, first three,
Four-pass requires to add up drafts >=150mm.1100～1150 DEG C of setting start rolling temperature start rolling temperature, finishing temperature >=950 DEG C,
In order to the disperse for realizing blank sulfide is refined, reduce sulfide length-width ratio, make the rolling temperature of steel as far as possible control 1000～
Between 1150 DEG C, high temperature rolling contributes to avoiding sulfide brittle temperature range.
The sulfur-bearing mould of plastics steel thick plate of present invention production, low production cost, production efficiency are high, with short production cycle, compared with steel
Ingot is become a useful person the mould of plastics steel thick plate of technique productions, lumber recovery is greatly improved, reduces production cost.
The sulfur-bearing mould of plastics steel thick plate of present invention production, its maximum gauge can be met up to 200mm, ultrasound examination
The Defect Equivalent flaw detection requirement of φ 2.0mm, steel plate even tissue, little with plate difference in hardness, steel plate processing characteristics is good.
Description of the drawings
Fig. 1 be the embodiment of the present invention in sulfur-bearing mould of plastics steel thick plate along thickness of slab direction surface tissue morphology figure；
Fig. 2 is tissue morphology figure of the sulfur-bearing mould of plastics steel thick plate at thickness of slab direction 1/4 in the embodiment of the present invention；
Fig. 3 is tissue morphology figure of the sulfur-bearing mould of plastics steel thick plate at thickness of slab direction 1/2 in the embodiment of the present invention；
Fig. 4 is that in sulfur-bearing mould of plastics steel thick plate, sulfide is distributed metallograph in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
A kind of sulfur-bearing plastic die steel process for producing thick plate, the mould steel maximum gauge can reach 200mm, the production work
Skill adopts suitable composition design, belongs to middle carbon high-alloy steel, and the chemical composition of steel plate is C by mass percentage：0.35～
0.45%, Si：0.30～0.50%, Mn：1.40～1.60%, Cr：1.80～2.00%, Mo：0.18～0.25%, Ti：0.008～
0.015%, S：0.05～0.10%, P≤0.015%, remaining is Fe and inevitable impurity.Pneumatic steelmaking, thick even with 450mm
Strand is become a useful person, and obtains steel plate even tissue by rational mode of heating, rolling mill practice and heat treating regime, with plate difference of hardness
The mould steel thick plate not little, steel plate processing characteristics is good.Concrete technology step is as follows：
（1）Smelting molten steel, molten steel successively through converter smelting, LF refining and RH vacuum outgas, LF refining process is using precipitation
The mode that deoxidation and diffusive deoxidation combine is carrying out deoxidation：Ferrosilicon is added in molten steel and carry out precipitating with the carborundum for becoming bag and take off
Oxygen, is diffused deoxidation using the thin silicon carbide powder that floats, is finely adjusted sulphur after RH vacuum outgas, carry out calcium to slag surface
Process, change the form of sulfide, the Ti-Fe line of feeding；Ensure the soft blow time, so that inclusion content in melting steel is effectively floated；
（2）Continuous casting, the degree of superheat of Pouring control molten steel realize low overheat continuous casting, using centre at 15～25 DEG C
Bag heating technique, in crystallizer, the electromagnetic mixing apparatus of configuration stirring molten steel optimize sulfide and divide to reduce blank internal-external temperature difference
Cloth and contribute to molten steel heat release, reduce blank inside and outside temperature difference；Two cold-zones arrangement atomization water-cooling apparatus is carried out to blank surface
Atomization water-cooled, is conducive to blank surface uniform decrease in temperature, improves surface quality；Electromagnetic agitation is adopted in molten steel solidification end, slow down
Blank internal segregation phenomenon, then coordinate dynamic soft-reduction technique, dynamic soft-reduction controls blank drafts >=10mm, obtains
The continuous casting billet of 450mm or more；
（3）Slow cooling, continuous casting billet cutting on line, offline enter to cheat heap slow cooling or covering heap slow cooling, slow cooling more than 48 hours, slow cooling
Pad hot base in hole bottom makes hole temperature be maintained above 150 DEG C, and blank is piled rear outer layer and adds insulation cover；For covering heap slow cooling blank,
It is required that remaining space is little in cover, it is to avoid too fast radiating, optimize continuous casting material i nside sulfid and be distributed and slow down the inclined of alloying element
Analysis, contributes to eliminating with plate difference of hardness, and when blank plays hole or goes out cover, at 200～250 DEG C, blank is from burial pit for surface temperature control
Blank surface band temperature detector is looked into after playing hole, defect is carried out warm cleaning is carried, blank surface defect is eliminated, improve product surface product
Matter；
（4）Continuous oven is sent in heating, blank band temperature, and charging temperature is not less than 150 DEG C, continuous oven setting stepwise programming rate：
≤ 1000 DEG C, programming rate is 80～100 DEG C/h；1000 DEG C of ＞, 50～70 DEG C/h of programming rate；Soaking temperature 1250 ± 10
DEG C, 1280 DEG C of maximum heating temperature；
（5）Rolling, using the big pressure rolling mill practice of low speed, previous three passes add up drafts >=150mm, set start rolling temperature
1100～1150 DEG C, finishing temperature >=950 DEG C, control steel rolling deformation temperature, on the one hand can be real between 1000～1150 DEG C
The disperse refinement of existing sulfide, reduces sulfide length-width ratio, and on the other hand, high temperature rolling contributes to avoiding sulfide brittleness temperature
Interval, adopts 2～3 sub-high pressure water de-scalings, it is ensured that plate surface quality in the operation of rolling, rolling increases by 2～3 smooth roads before terminating
Secondary, it is ensured that steel plate unevenness≤3mm/m, it is ensured that the flatness of steel plate and surface quality during rolling；
（6）Slow cooling, offline heap slow cooling after the completion of rolling；
（7）Normalizing+tempering heat treatment, carries out normalizing+tempering heat treatment using carriage return stove to steel plate, sets normalizing temperature
860 ± 10 DEG C, temperature retention time 2min/mm, steel plate tempering process are set according to the thickness of steel plate：Thickness≤100mm steel plate, tempering
580 ± 5 DEG C of temperature, time inside furnace are 4.0min/mm；Thickness G T.GT.GT 100mm steel plate, 570 ± 5 DEG C of temperature, time inside furnace is
4.0min/mm, it is ensured that the hardness of all specification steel plates is within 30～36HRC；
（8）Flaw detection, is detected a flaw according to the Defect Equivalent flaw detection requirement of φ 2.0mm, is visited compared with JB/T 4730.3-2005 level
Hinder standard and require more strict, qualified i.e. acquisition sulfur-bearing mould of plastics steel thick plate finished product.
The sulfur-bearing mould of plastics steel thick plate appearance surfaces of above-mentioned technique productions are bright and clean, flawless, scab, fold, pit etc.
Defect, steel plate interior solid, nothing sand holes.As shown in Figure 1 to Figure 3, it is metallographic group at sulfur-bearing mould of plastics slab different-thickness
Knit, slab tissue is uniform in a thickness direction, is tempering bainite tissue, in tissue, lead strip is sulphide inculsion.Such as
Shown in Fig. 4, sulfide is distributed in strip along rolling direction, and sulphide inculsion amount greatly and is in Dispersed precipitate, and length-width ratio is moderate, presses
ASTM E45 standard determination, at 3.5～4.0 grades, thick class is at 1.5～2.5 grades for subclass.
The sulfur-bearing mould of plastics slab of above-mentioned technique productions, maximum gauge reach 200mm, steel plate sulfide and alloy unit
Element no substantially segregation, section hardness are evenly distributed, and whole plate difference of hardness is less than 2.0HRC, and machinability is good, polishing performance
Excellent.
The sulfur-bearing mould of plastics slab of above-mentioned technique productions, relatively molds technique of becoming a useful person and improves lumber recovery, be greatly lowered
Production cost, combination property are more preferable.
Claims (4)
1. a kind of technique for producing sulfur-bearing mould of plastics steel thick plate, it is characterised in that：The chemical composition of the mould steel thick plate presses matter
Measuring percentages is, C：0.35～0.45%, Si：0.30～0.50%, Mn：1.40～1.60%, Cr：1.80～2.00%, Mo：
0.18～0.25%, Ti：0.008～0.015%, S：0.05～0.10%, P≤0.015%, remaining are Fe and inevitably miscellaneous
Matter, the thickness of the steel plate can reach 200mm；
Step is as follows
（1）Smelting molten steel, successively through converter smelting, LF refining and RH vacuum outgas, LF refining process adopt precipitation desoxydation to molten steel
The mode combined with diffusive deoxidation is carrying out deoxidation：Ferrosilicon is added in molten steel and becomes the carborundum of bag to carry out precipitation desoxydation,
Deoxidation is diffused using the thin silicon carbide powder that floats to slag surface, after RH vacuum outgas, carries out Calcium treatment, and feed
Ti-Fe line；
（2）Continuous casting, the degree of superheat of Pouring control molten steel is 15～25 DEG C, is stirred using configuration in Tundish Heating, crystallizer
The electromagnetic mixing apparatus of molten steel are mixed to reduce blank internal-external temperature difference, two cold-zones arrangement atomization water-cooling apparatus is carried out to blank surface
Atomization water-cooled, in molten steel solidification end using electromagnetic agitation and dynamic soft-reduction technique, dynamic soft-reduction control blank pressure
Amount >=10mm, obtains the continuous casting billet of 450mm or more；
（3）Slow cooling, continuous casting billet cutting on line, offline enter to cheat heap slow cooling or covering heap slow cooling, slow cooling more than 48 hours, blank plays hole
Or when going out cover surface temperature control at 200～250 DEG C；
（4）Heating, blank band temperature shove charge, charging temperature are not less than 150 DEG C, setting stepwise programming rate：≤ 1000 DEG C, heat up speed
Spend for 80～100 DEG C/h；1000 DEG C of ＞, 50～70 DEG C/h of programming rate；1250 ± 10 DEG C of soaking temperature, maximum heating temperature
1280℃；
（5）Rolling, using the big pressure rolling mill practice of low speed, first three adds up drafts >=150mm to four-pass, sets start rolling temperature
1100～1150 DEG C, finishing temperature >=950 DEG C, control steel rolling deformation temperature are adopted in the operation of rolling between 1000～1150 DEG C
With 2～3 sub-high pressure water de-scalings, rolling before terminating increases by 2～3 planishing passes, it is ensured that steel plate unevenness≤3mm/m；
（6）Slow cooling, offline heap slow cooling after the completion of rolling；
（7）Normalizing+tempering heat treatment, 860 ± 10 DEG C of normalizing temperature, 2～4min/mm of temperature retention time, tempering process is according to steel plate
Thickness set：Thickness≤100mm steel plate, 580 ± 5 DEG C of temperature, time inside furnace are 4.0min/mm；Thickness G T.GT.GT 100mm steel
Plate, 570 ± 5 DEG C of temperature, time inside furnace are 4.0min/mm, it is ensured that all specification steel plates are within 30～36HRC；
（8）Flaw detection, is detected a flaw according to the Defect Equivalent flaw detection requirement of φ 2.0mm, and qualified i.e. acquisition sulfur-bearing plastic die steel is thick
Board finished product.
2. according to claim 1 production sulfur-bearing mould of plastics steel thick plate technique, it is characterised in that：Step（7）Using
Car type furnace carries out normalizing+tempering heat treatment to steel plate.
3. according to claim 1 production sulfur-bearing mould of plastics steel thick plate technique, it is characterised in that：Step（3）In, base
Material is looked into blank surface band temperature detector after cheating from burial pit, and defect is carried out carrying warm cleaning.
4. according to claim 1 production sulfur-bearing mould of plastics steel thick plate technique, it is characterised in that：Step（3）Middle institute
Stating the hot base of burial pit bottom pad makes hole temperature be maintained above 150 DEG C, and blank is piled rear outer layer and adds insulation cover；For covering heap slow cooling
Blank, it is desirable to which remaining space is little in cover, it is to avoid too fast radiating.
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| CN106119706B (en) * | 2016-06-27 | 2018-03-02 | 舞阳钢铁有限责任公司 | Quenching and tempering type adds S easy-cutting die steels plate and its production method |
| 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 |
| CN107177796B (en) * | 2017-04-24 | 2019-10-11 | 江阴兴澄特种钢铁有限公司 | 100-260mm thickness quenched and tempered state pre-hardening plastic steel plate for die and its manufacturing method |
| 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 |
| CN110129516A (en) * | 2019-06-11 | 2019-08-16 | 南京钢铁股份有限公司 | A kind of method of oxide morphology in control low carbon high sulfur free-cutting steel |
| CN110284058B (en) * | 2019-06-19 | 2022-02-01 | 江阴兴澄特种钢铁有限公司 | High-hardness carbon steel for die carrier |
| 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 |
| CN112139245B (en) * | 2020-08-28 | 2022-07-22 | 张家港宏昌钢板有限公司 | Production method of plastic die steel plate |
| CN114427065A (en) * | 2021-12-28 | 2022-05-03 | 南阳汉冶特钢有限公司 | Production method of 250-400mm thick high-quality low-cost plastic mold steel 1.2738 |
| CN116770169A (en) * | 2023-05-15 | 2023-09-19 | 江阴兴澄特种钢铁有限公司 | 201-300mm thick free-cutting pre-hardening die steel plate and manufacturing method thereof |
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