CN101914665A - Process for producing thick plate of plastic die steel - Google Patents
Process for producing thick plate of plastic die steel Download PDFInfo
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- CN101914665A CN101914665A CN 201010266549 CN201010266549A CN101914665A CN 101914665 A CN101914665 A CN 101914665A CN 201010266549 CN201010266549 CN 201010266549 CN 201010266549 A CN201010266549 A CN 201010266549A CN 101914665 A CN101914665 A CN 101914665A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
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- 238000000034 method Methods 0.000 title claims abstract description 31
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- 238000004512 die casting Methods 0.000 claims abstract description 23
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Abstract
The invention discloses a process for producing a thick plate of plastic die steel. The thick plate of the plastic die steel is obtained by the following steps of: pouring by using an open-close type water-cooled die casting machine, performing reasonable heating system, rolling and normalizing and annealing after rolling. Low temperature pouring and a pouring process of feeding on bottom pouring are performed, so molten steel is quickly solidified by forced cooling of circulating water; the molten steel is not born any shrinkage resistance so as to ensure that a wide surface of the die casting blank does not have any crack; the heating temperature of a steel ingot does not exceed 1,280 DEG C, so that alloy elements are fully dissolved; the rough rolling temperature is 1,100 to 1,200 DEG C, and a rough rolling stage is performed at the high temperature under high pressure; after a fine rolling stage is performed at the temperature of 950 DEG C, the finishing temperature is greater than or equal to 920 DEG C; the discharging temperature after rolling is 750 to 830 DEG C, and the steel plate is cooled in pile for 72 hours after rolling; the steel plate is normalized and annealed; and the solution temperature is about 870 DEG C, and the aging temperature is 500 to 550 DEG C, so that the thick age-hardened plastic die steel plate is obtained. After flaw detection, each performance index of the plastic die steel produced by the invention meets the requirement.
Description
Technical field
The present invention relates to a kind of slab preparation technology of age hardening steel, specifically a kind of process for producing thick plate of plastic die steel.
Background technology
Along with manufacturing continuous development, the demand of the steel alloy of thick specification increases day by day, and age hardening plastic die steel P80A carbon content is lower, and the alloy degree is higher, vacuum metling and the electroslag remelting process of adopting in the production more.Be the senior mirror surface mould steel of a kind of Ni-Cu-Al precipitation hardening type, have good cold and hot working performance and comprehensive mechanical property, thermal treatment process is easy, be out of shape little, the hardening capacity height.The patent No. is that the NAK80 die steel of 200510027393.6 exploitations adopts " hot-work forging molding+quenching+tempering " three-steps process flow process.Adopt the conventional die castings method to obtain steel ingot, adopt forging press when hot-work is forged, produce the finished product die steel steel of size conforms specification standards die steel hot-work forging deformation.When hot-work was forged, the steel final forging temperature was controlled in 860-920 ℃ the scope, and hot-work forging deformation amount is controlled at 15-20%.Quenching technology is directly put into conventional quenching liquid with the finished product die steel steel of size conforms specification standards and is carried out solution treatment, is cooled to 150-250 ℃ in hardening liquid.Steel are being inserted in the tempering stove, steel are being heated to 490-560 ℃, be incubated after 2-6 hour, steel are being shifted out the tempering stove air cooling to room temperature with the heat-up rate of 80-100 ℃/h.
The high cast of tradition casting ingot method mould consumption is difficult, demoulding difficulty, and solidification of molten steel is slow, easily produces shrinkage cavity, segregation, defectives such as short ingot badly bleeding, and production efficiency is low, the cost height, and lumber recovery is low.The production of esr slab ingot needs special equipment, needs big investment, complex process, and energy consumption height.Although continuous casting can adopt long straight vertical section to increase the probability that is mingled with come-up as far as possible, but because the continuous casting rhythm of production is fast, it is not enough so that all inclusiones have the time enough come-up, when aligning back strand is horizontal, in metallurgical length, still there be solidifying of liquid metal in strand inside, part is mingled with the obstruct that come-up is subjected to the outside solidification layer of strand in process of setting, and the rear portion is near the core feeding passage that solidifies fully and not smooth, thus cause continuously cast bloom exist in various degree be mingled with enrichment, segregation and loose zone.These subsurface defects are unlikely to affect greatly for the internal soundness of the big plate of moderate thickness of compression ratio, but for the little slab of compression ratio, because the restriction of follow-up mill capacity, the rolling draught deficiency of passage, the distortion penetration degree is limited, improves core tissue, pressing to loosen, alleviate the effect of segregation less by rolling.Therefore, adopting continuously cast bloom to produce the less slab of compression ratio, is very high to the specification of quality of continuously cast bloom, adopts comparatively difficulty of common continuous casting process production high-quality Plate Steel.And be used for high-grade plastic die steel alloy content height, little in batches, the price height is not suitable for continuous caster production.
Summary of the invention
In order to overcome technology imperfection, the problems such as investment is big, the thickness of slab specification is low, cost height that the plastic die steel process for producing thick plate exists in the prior art, the process for producing thick plate that the purpose of this invention is to provide a kind of plastic die steel, this production technique adopts the cast of open-close type water cooled die casting machine, by rational heating cycle and rolling technology, normalized and tempered production, the mould of plastics steel thick plate that obtains can pass through flaw detection, and every performance index reach requirement.
The objective of the invention is to be achieved through the following technical solutions:
A kind of process for producing thick plate of plastic die steel, it is characterized in that this production technique adopt the cast of open-close type water cooled die casting machine, by rational heating cycle and rolling technology and by roll the back normalizing, temper obtains the mould of plastics steel thick plate, concrete steps are as follows:
1) adopt the cast of open-close type water cooled die casting machine, adopt cast cold, the pouring technology of feeding in the rising pouring, the recirculated water cooling crystallizer makes the molten steel rapid solidification, and molten steel does not bear any deflation resistance, guarantees wide flawless of die casting base;
2) determine process furnace internal heating system, the Heating temperature of steel ingot is no more than 1280 ℃, makes the abundant solid solution of alloying element;
3) roughing temperature is 1100-1200 ℃, and rough rolling step adopts high temperature to depress greatly, after the 950 ℃ of open rollings of finish rolling stage, and finishing temperature 〉=920 ℃; 750-830 ℃ of the temperature that rolls off the production line after rolling rolled back cooling in heap 72h;
4) steel plate is carried out normalizing, temper, solid solubility temperature aging temperature 500-550 ℃, obtains the mould of plastics steel thick plate about 870 ℃.
The present invention is when adopting the cast of open-close type water cooled die casting machine, and the bight is provided with and is used for the circular arc of dispersive stress, and circular arc is R25mm, and the die casting base that obtains does not have chink; Die casting base center equiaxial crystal ratio 〉=30%, visual shrinkage cavity are zero.。For making the abundant solid solution of alloying element, the Heating temperature of steel ingot is 1280 ℃, total 7-8 hour heat-up time.
Solid solubility temperature of the present invention should be at A
C3More than, on the basis of the solubleness of taking into account Cu and grain growth temperature, solid solubility temperature is 870 ℃, soaking time 2min/mm.NiAl strengthening phase in the steel is at 400-630 ℃ of precipitation, so aging temp can not surpass this temperature range.Aging temp is very big to the sclerization influence of age hardening steel, variation along with aging temp, timeliness selects hardening curve to have a peak, peak value reduces along with the increase of aging temp, best timeliness peak value is about 510 ℃, the second-phase dispersion uniform distribution of separating out under this temperature, and keep the coherence relation with matrix, strengthening effect is best.Aging time is 2.5min/mm.
The present invention adopts water-cooled die casting technology, the molten steel stationary crystallization, and no straightening, the chance that chink and implosion occur is few.Rising pouring technology, inclusion easily floats.The surface and the internal soundness of steel billet are better; The recirculated water cooling crystallizer makes the molten steel crystallization velocity fast, does not have 2 times and 3 dendritic crystalline substances; Die casting machine can be by a plurality of die body combinations, and the adjustment of strand description is changed easily, and is applied widely; Can carry out the high temperature demoulding, conditions permit, steel billet can realize that heat send hot charging; The hydraulic pressure matched moulds, die sinking, many ingots are finished the demoulding simultaneously.Strand internal soundness and continuously cast bloom are close, owing to do not have the shake trace, chink and surface oxidation, surface quality obviously is better than continuously cast bloom.
With the rolling thick specification die steel of open-close type water cooled mo(u)ld strand, than using continuously cast bloom more to adapt to many kind, the requirement of short run, and more economical.Surface and internal soundness are higher than the die casting base, and production cost is lower than continuously cast bloom.
Beneficial effect of the present invention is as follows:
1) the water-cooled die casting cast adapts to the demand of many kinds, many dimensionss, short run, and pouring speed is fast, and the die sinking time of moulding adobe blocks lacks, and strand does not have shrinkage cavity and pore, the yield rate height.The steel billet temperature height that casts out during the demoulding, can feed mill directly rolling.The quality of water cooled mo(u)ld strand is higher than the die casting base, and production cost is lower than continuously cast bloom.
2) ultrasound examination reached JB/T4730.3-2005 standard I level after the blank of producing was rolled into 80-120mm slab product, and the inclusion rank is lower, and grain fineness number reaches 11 grades, and over-all properties is good.
3) slab thickness 300-400mm can roll out the plastic die steel of the special thick specification of 80-120mm, and the every performance index of product are qualified, satisfied the customer requirements and the market requirement.
4) the age hardening treatment process advantages of simple of Cai Yonging, handle by solid solution and age hardening, make steel plate cross section hardness even, average hardness has reached technical indicator, need not quenching furnance and just can finish whole age hardening processing, it is with short production cycle that whole age hardening is handled.
Description of drawings
Fig. 1 (a) is the tissue morphology figure on mould of plastics steel thick plate hot rolling attitude surface;
Fig. 1 (b) is the tissue morphology figure at mould of plastics steel thick plate hot rolling attitude 1/4 place;
Fig. 1 (c) is the tissue morphology figure of mould of plastics steel thick plate hot rolling attitude heart portion;
Fig. 2 (a) is the tissue morphology figure on normalizing attitude mould of plastics steel thick plate surface after the solution treatment;
Fig. 2 (b) is the tissue morphology figure at normalizing attitude mould of plastics steel thick plate 1/4 place after the solution treatment;
Fig. 2 (c) is the tissue morphology figure of normalizing attitude mould of plastics steel thick plate heart portion after the solution treatment;
Fig. 3 (a) is the tissue morphology figure on tempering attitude mould of plastics steel thick plate surface after the solution treatment;
Fig. 3 (b) is the tissue morphology figure at tempering attitude mould of plastics steel thick plate 1/4 place after the solution treatment;
Fig. 3 (c) is the tissue morphology figure of tempering attitude mould of plastics steel thick plate heart portion after the solution treatment.
Embodiment
A kind of process for producing thick plate of plastic die steel, Age Hardened Die Steel for Plastics P80A chemical component weight per-cent: carbon 0.11～0.14%, manganese: 1.70～1.85%, nickel 2.85～3.15%, molybdenum: 0.25～0.35%, aluminium: 0.80～1.00%, silicon: 0.17～0.27%, copper 0.85-1.00, phosphorus≤0.015, sulphur≤0.012.This production technique adopt the cast of open-close type water cooled die casting machine, by rational heating cycle and rolling technology and by roll the back normalizing, temper obtains the mould of plastics steel thick plate, concrete steps are as follows:
Use the open-close type water cooled die casting machine to pour into a mould thickness 400mm, width 2.2m, the steel billet of length 3.5m.Force cooling under the water cycle condition, be frozen into base, steel billet does not have defectives such as the outer drum tripe of implosion, and it is fine and close that steel billet is formed, and inside and outside quality is good.During cast, open and water 20 ℃ of left and right sides superheating temperature of temperature maintenance, be controlled at the duration of pouring in the 20min scope, demould time is within an hour.
Adopt hot delivery and hot charging, charging temperature is less than 500 ℃, and the process furnace Heating temperature should not be above 1280 ℃, total heat-up time 7h, the roughing temperature is 1100-1200 ℃, intermediate blank thickness is 180mm during rolling 120mm slab, rough rolling step adopts high temperature to depress greatly as far as possible, and 5 passages have been rolled; After the 950 ℃ of open rollings of finish rolling stage, 6 passages have been rolled, finishing temperature 〉=920 ℃.Returning red temperature behind the air cooling is 850 ℃, and roller speed is 1.2m/s.750-830 ℃ of the temperature that rolls off the production line rolled back cooling in heap 72h.
Steel plate normalizing, tempering process: solid solubility temperature is 870 ℃, soaking time 2min/mm.About 510 ℃ of aging temperatures, soaking time 2.5min/mm.Obtain the qualified Age Hardened Die Steel for Plastics slab of performance through thermal treatment.
Fig. 1 (a) is the tissue morphology figure on mould of plastics steel thick plate hot rolling attitude surface; Fig. 1 (b) is the tissue morphology figure at mould of plastics steel thick plate hot rolling attitude 1/4 place; Fig. 1 (c) is the tissue morphology figure of mould of plastics steel thick plate hot rolling attitude heart portion.Slab hot rolling attitude tissue is mainly ferrite bainite and granular bainite tissue.
Fig. 2 (a) is the tissue morphology figure on normalizing attitude mould of plastics steel thick plate surface after the solution treatment; Fig. 2 (b) is the tissue morphology figure at normalizing attitude mould of plastics steel thick plate 1/4 place after the solution treatment; Fig. 2 (c) is the tissue morphology figure of normalizing attitude mould of plastics steel thick plate heart portion after the solution treatment; Fig. 3 (a) is the tissue morphology figure on tempering attitude mould of plastics steel thick plate surface after the solution treatment; Fig. 3 (b) is the tissue morphology figure at tempering attitude mould of plastics steel thick plate 1/4 place after the solution treatment; Fig. 3 (c) is the tissue morphology figure of tempering attitude mould of plastics steel thick plate heart portion after the solution treatment.Be organized as granular bainite and low-carbon lath martensite after the solution treatment.High density dislocation is arranged in the martensite lath, have residual austenite to distribute between martensite.According to the thickness difference, organize relative content that certain difference is arranged.By solution treatment carbon and alloying element in the steel fully are solidly soluted in the austenite.Fig. 3 is the tissue morphology figure after steel plate is handled through temper aging; Steel are handled by temper aging, the lath martensite carbide precipitate, and alloy martensite is changed on rich carbon martensite island in the granular bainite, and austenite resolves into martensite and carbide.In ag(e)ing process, phase NiAl and copper-rich phase M between the disperse precipitating metal from matrix
2X and matrix is strengthened.
Studies show that the mould of plastics steel thick plate is after solid solution aging is handled, cross section hardness is even, and average Brinell hardness is 380-430HB, meets technical requirements.
Ultrasound examination is by JB/T4730.3-2005 standard I level, and the inclusion rank is lower, and grain fineness number is 11 grades, good combination property.
With the rolling thick specification die steel of open-close type water cooled mo(u)ld strand, than using continuously cast bloom more to adapt to many kind, the requirement of short run, and more economical.Surface and internal soundness are higher than the die casting base, and production cost is lower than continuously cast bloom.
Claims (4)
1. the process for producing thick plate of a plastic die steel, it is characterized in that this production technique adopt the cast of open-close type water cooled die casting machine, by rational heating cycle and rolling technology and by roll the back normalizing, temper obtains the mould of plastics steel thick plate, concrete steps are as follows:
1) adopt the cast of open-close type water cooled die casting machine, adopt cast cold, the pouring technology of feeding in the rising pouring, recirculated water forces cooling to make the molten steel rapid solidification, and molten steel does not bear any deflation resistance, guarantees wide flawless of die casting base;
2) determine process furnace internal heating system, the Heating temperature of steel ingot is no more than 1280 ℃, makes the abundant solid solution of alloying element;
3) roughing temperature is 1100-1200 ℃, and rough rolling step adopts high temperature to depress greatly, after the 950 ℃ of open rollings of finish rolling stage, and finishing temperature 〉=920 ℃, 750-830 ℃ of the temperature that rolls off the production line after rolling rolled the back cooling in heap;
4) steel plate is carried out normalizing, temper, solid solubility temperature aging temperature 500-550 ℃, obtains the mould of plastics steel thick plate at 870 ℃.
2. the process for producing thick plate of plastic die steel according to claim 1, it is characterized in that: in the step 1), cast cold prevents that column crystal is thick; Force cooling under water cycle, be frozen into base, form thinner one deck equiax crystal on the surface, surface quality is good; The bight is provided with and is used for the circular arc of dispersive stress, and the die casting base that obtains does not have chink; Die casting base center equiaxial crystal ratio 〉=30%, visual shrinkage cavity are zero.
3. the process for producing thick plate of plastic die steel according to claim 1 is characterized in that: step 2) in, adopted suitable heating cycle, be 7-8 hour the heat-up time of steel ingot.
4. the process for producing thick plate of plastic die steel according to claim 1, it is characterized in that: in the step 4), solid solubility temperature is 860 ℃, soaking time 2min/mm; Aging temp is at 510 ℃, soaking time 2.5min/mm.
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| CN102091727A (en) * | 2010-12-21 | 2011-06-15 | 南阳汉冶特钢有限公司 | Method for improving internal quality of medium plate |
| CN102836970A (en) * | 2012-08-29 | 2012-12-26 | 内蒙古北方重工业集团有限公司 | Water cooling die casting process of polygonal steel ingots, and water cooling die casting device |
| CN103111464A (en) * | 2013-03-05 | 2013-05-22 | 北京科技大学 | Manufacturing method of super-thick steel plate |
| CN104001877A (en) * | 2014-05-22 | 2014-08-27 | 山东宝鼎重工实业有限公司 | Steel ingot water-cooling crystallization process without feed head |
| CN104911321A (en) * | 2015-06-12 | 2015-09-16 | 江阴兴澄特种钢铁有限公司 | Extra-thick steel plate production process of plastic dies steel |
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| CN104001877B (en) * | 2014-05-22 | 2016-11-30 | 山东宝鼎重工实业有限公司 | A kind of No-head Ingot water-cooled crystallization processes |
| CN106521318A (en) * | 2016-11-22 | 2017-03-22 | 河北工业大学 | High-strength Fe-Mn-Al-C-series low density cast steel and preparation method thereof |
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| CN110565014A (en) * | 2019-08-16 | 2019-12-13 | 江阴兴澄特种钢铁有限公司 | production process of high-mirror-surface plastic die steel 1Ni3MnCuMoAl thick plate |
| CN112139245A (en) * | 2020-08-28 | 2020-12-29 | 张家港宏昌钢板有限公司 | Production method of plastic die steel plate |
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