CN104911321A - 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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- CN104911321A CN104911321A CN201510321867.1A CN201510321867A CN104911321A CN 104911321 A CN104911321 A CN 104911321A CN 201510321867 A CN201510321867 A CN 201510321867A CN 104911321 A CN104911321 A CN 104911321A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 229920003023 plastic Polymers 0.000 title claims abstract description 47
- 239000004033 plastic Substances 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 63
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 37
- 238000010583 slow cooling Methods 0.000 claims description 20
- 238000002791 soaking Methods 0.000 claims description 18
- 238000009749 continuous casting Methods 0.000 claims description 15
- 230000007547 defect Effects 0.000 claims description 12
- 238000005496 tempering Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000007711 solidification Methods 0.000 claims description 8
- 230000008023 solidification Effects 0.000 claims description 8
- 238000009933 burial Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000011946 reduction process Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- -1 Si:0.20 ~ 0.40% Substances 0.000 claims 1
- 238000000889 atomisation Methods 0.000 claims 1
- 230000006698 induction Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000005266 casting Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 229910000851 Alloy steel Inorganic materials 0.000 abstract 1
- 238000005204 segregation Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 5
- 229910001214 P-type tool steel Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 206010039509 Scab Diseases 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000209202 Bromus secalinus Species 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Heat Treatment Of Steel (AREA)
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, be specifically related to the thick plastic die steel production technique of a kind of spy utilizing large round billet to become a useful person.
Background technology
Along with advancing by leaps and bounds of plastics industry, the demand of plastic die steel sharply increases, and wherein pre-hardened plastic mold steel market demand is larger.Because pre-hardened plastic mold steel just reaches hardness required by user and use properties when producer supplies, after user obtains material, directly can be processed into mould, do not need to carry out to quench, tempering heat treatment just can directly use, this kind of steel avoid to carry out again quenching after Mould Machining, tempering heat treatment operates the defect such as distortion, cracking, decarburization caused, there is good obdurability simultaneously, cutting ability and the advantage such as polishing performance, dimensional precision, pre-hardened plastic mold steel is suitable for manufacturing complex-shaped, accurate mould of plastics, and cost performance is higher.
Plastics day by day to large-scale, complicated, accurate future development, as washing machine cylindrical shell, refrigerator inner chamber, large-scale colour TV cabinet etc.In order to the size adapting to plastics increasingly maximize, shape complicated, also more and more stricter to the requirement of plastic die steel, iting is desirable to wish that material has good machinability, mirror polishability etc. while Steel for Plastic Die specification increases.
Plastic steel plate for die dog-eat-dog on domestic market, but steel plate thickness concentrates on below 120mm, many enterprises set about in refining steel and rolled steel, quality of materials is optimized in attempt, improve product competitiveness, but eventually because being subject to the restriction of continuous casting steel billet thickness, can not produce the larger and plastic die steel steel plate of internal soundness excellence of thickness.
For mould of plastics slab, become a useful person due to continuous casting steel billet and cause compression ratio inadequate, the distortion of blank internal penetration is not in place, internal quality of steel plate can not be ensured, easily occur sand holes, loose defect." teeming of open-close type water cooled die casting machine become a useful person technique " that the patent No. 201010266549.7 is developed, the quality of mould of plastics steel thick plate is improved, but this process costs is higher, complex procedures, the production cycle is longer.Domestic at present have some enterprises to take traditional ingot casting to become a useful person technique, because the ingot casting rising head position lumber recovery that causes of poor quality is low, and this technique mould consumption is high, casting is difficult, because solidification of molten steel causes the defect such as shrinkage cavity, segregation slowly, the surface of steel plate of roll forming and core hardness difference greatly, affect the following process of client.
Summary of the invention
Technical problem to be solved by this invention is the special heavy plate and the production technique thereof that provide a kind of plastic die steel for above-mentioned prior art, become a useful person with continuous casting ф 1000mm large round billet, by optimizing rational heating, rolling, thermal treatment process, improve the internal soundness of plastic die steel special heavy plate, steel plate obtains more has better uniformity of hardness while heavy thickness, and the thickness of plastic die steel can reach 250mm.The problems such as the casting overcoming existing " die casting-ingot formation-reversing mill rolling or ingot casting forging are become a useful person technique " is difficult, mould consumption is high, lumber recovery is low, cost is higher, complex procedures, production cycle are longer, especially improve lumber recovery.
The present invention's adopted technical scheme that solves the problem is that provide a kind of special heavy plate production technique of mould of plastics, concrete steps are as follows:
Become a useful person with continuous casting ф 1000mm large round billet, use straight arc continuous caster continuous casting φ 1000mm large round billet, cutting on line becomes the blank of certain length.Control molten steel overheat 10 ~ 20 DEG C, realize low overheat continuous casting, the electromagnetic mixing apparatus stirring molten steel is installed in crystallizer, utilize electromagnetic stirring equipment, contribute to the timely heat release of molten steel, reduce blank inside and outside temperature difference, contribute to eliminating crystallizer surface molten steel solidification encrustation phenomena; Atomized water refrigerating unit is arranged in two cold-zones, by spraying atomized water cooling to blank surface, being conducive to blank surface uniform decrease in temperature, improving surface quality; Adopt electromagnetic agitating technology and dynamic soft reduction technology at molten steel solidification end, slow down hole defect and segregation phenomena that oval blank core produces because molten steel solidification shrinks, improve blank internal soundness.
(1) continuous casting gained blank heat delivers to soaking pit, and setting charging temperature is 600 ± 10 DEG C; If do not possess heat to send condition, soaking pit is delivered to again by after blank slow cooling, pad hot base bottom burial pit hole temperature to be remained on be greater than 50 DEG C, blank skin adds a cover woven asbesto, then cover insulation cover, slow cooling 24 ~ 48h, blank goes out to cheat surface temperature control at 200 ~ 250 DEG C, to the blank entering to cheat slow cooling, setting charging temperature is not less than 150 DEG C;
(2) heat, the heat-up rate of setting stepwise soaking pit :≤1000 DEG C, heat-up rate is 80 ~ 100 DEG C/h; > 1000 DEG C, heat-up rate 50 ~ 70 DEG C/h; Maximum heating temperature 1280 DEG C, soaking temperature 1260 ± 10 DEG C, this heating and thermal insulation mode can guarantee the abundant solid solution of the alloying element of this composition blank, and ensures that autstenitic grain size is thick not too much, ensure homogeneous grain size inside and outside oval blank, eliminate the metallographic difference of thickness direction as far as possible;
(3) rolling, adopt shaped blank rolling technology, design " axial rolling → angular rolling → transverse rolling → axial rolling " technical process, start rolling temperature 1050 ~ 1100 DEG C, steel plate rolling adopts the large soft reduction process rolling of low speed, rolling gross distortion can guarantee that oval base rolling deformation can penetrate into strand centre portions, to eliminate the uneven deformation on thickness direction as much as possible; Axial rolling stage draught per pass 60 ~ 90mm, front four-pass pressure total amount >=300mm, the 5th to the tenth passage adopts 15 ° of angular rolling techniques to carry out blank broadening, finishing temperature >=900 DEG C;
(4) slow cooling, after rolling completes, by blank air cooling to 300 ± 50 DEG C, steel plate arrangement pitch >=1.5m, heap slow cooling of then rolling off the production line, heap slow cooling time >=48h;
(5) normalizing+tempering heat treatment, preferred car type furnace carries out normalizing+tempering heat treatment to steel plate, and car type furnace space is little, and internal temperature is even; Steel plate heats up with stove, contributes to slowing down steel plate hot stress, ensures steel plate template; Car type furnace adopts blast furnace (BF) gas heating, production cost can be reduced, normalizing temperature 850 ~ 880 DEG C, soaking time 2 ~ 4min/mm, tempering temperature 550 ~ 600 DEG C, soaking time 3.5 ~ 4.5min/mm, obtain pre-hardening type mould of plastics slab, normalizing contributes to the internal segregation slowing down mould of plastics slab, uniform steel sheet tissue, reduces same plate different place difference of hardness.
Preferably, in step (1), blank carries out band temperature detector to blank surface behind hole and looks into from burial pit, is with temperature cleaning, flame cleaning temperature >=150 DEG C, eliminates blank surface defect, improve product surface quality to defect.
Further, in the operation of rolling, adopt 3 ~ 5 sub-high pressure water de-scalings, ensure plate surface quality; Use edge rolling, ensure quality of edges; Suitably increase by 2 ~ 3 planishing passes in the operation of rolling, guarantee steel plate roughness≤3mm/m, to improve planeness and the surface quality of steel plate further, guarantee surface of steel plate flawless, scab, bubble, defect, to be mingled with or pit, the straight of steel plate can be guaranteed in the operation of rolling.
The production of carbon high alloy die steel plate during above-mentioned technique especially adapts to, by mass percentage, C:0.38 ~ 0.42% in steel plate, 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%, all the other are Fe and inevitable impurity.
The present invention has following features:
Pre-hard state plastic die steel of the present invention belongs to middle carbon high quality steel, and crackle is very sensitive, very easily produces heart portion and surface crack.For avoiding after continuous casting φ 1000mm large round billet off-line because of speed of cooling too fast generation tissue change stress, blank inside is caused to there is tiny crack, the first-selected hot delivery and hot charging of strand, if do not possess hot delivery and hot charging condition, strand cheats slow cooling under must accomplishing high temperature, and sets specific slow cooling condition in case the appearance of crack arrest line.
The present invention adopts soaking pit to heat large round billet, high insulating effect, and in-furnace temperature is even.
The present invention adopts shaped blank rolling technology, steel plate rolling adopts the large soft reduction process rolling of low speed, guarantees that rolling deformation can penetrate into strand centre portions, eliminates final gained steel plate difference in a thickness direction, guarantee uniform texture, this technique can realize the rolling of heavy thickness steel plate.
Compared with prior art, the invention has the advantages that: the thick plastic steel plate for die of spy that involved technique obtains, production cost is low, production efficiency is high, with short production cycle, compared with the plastic steel plate for die that " die casting-ingot formation-reversing mill rolling or ingot casting forge technique of becoming a useful person " produces, increase substantially lumber recovery, reduced production cost.
The thick plastic steel plate for die of spy that the present invention produces, maximum ga(u)ge reaches 250mm, steel plate homogeneous microstructure, and performance is homogeneous, and reach JB/4730.3-2005 standard level through ultrasound examination, inclusion behavior is low, and steel plate processing characteristics is good.
Accompanying drawing explanation
Fig. 1 be in the embodiment of the present invention pre-hardening type mould of plastics slab along the tissue morphology figure on surface, thickness of slab direction;
Fig. 2 be in the embodiment of the present invention pre-hardening type mould of plastics slab along the tissue morphology figure at thickness of slab direction 1/4 place;
Fig. 3 be in the embodiment of the present invention pre-hardening type mould of plastics slab along the tissue morphology figure at thickness of slab direction 1/2 place.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
A special heavy plate production technique for plastic die steel, die steel maximum ga(u)ge can reach 250mm, and this production technique adopts suitable Composition Design, belong to middle carbon high quality steel, the chemical composition of steel plate is C:0.38 ~ 0.42% by mass percentage, 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%, all the other are Fe and inevitable impurity.Converter steelmaking, with φ 1000mm large round billet continuous casting material-forming, obtains internal soundness excellence by rational type of heating, rolling technology and heat treating regime, the pre-hardening type mould of plastics slab that processing characteristics is good.Concrete technology step is as follows:
Use straight arc continuous caster continuous casting φ 1000mm large round billet, cutting on line becomes the blank of about 2000mm.Control molten steel overheat 10 ~ 20 DEG C, realize low overheat continuous casting, the electromagnetic mixing apparatus stirring molten steel is installed in crystallizer, utilize electromagnetic stirring equipment, contribute to the timely heat release of molten steel, reduce blank inside and outside temperature difference, contribute to eliminating crystallizer surface molten steel solidification encrustation phenomena; Atomized water refrigerating unit is arranged in two cold-zones, by spraying atomized water cooling to blank surface, being conducive to blank surface uniform decrease in temperature, improving surface quality; Adopt electromagnetic agitating technology and dynamic soft reduction technology at molten steel solidification end, slow down hole defect and segregation phenomena that oval blank core produces because molten steel solidification shrinks, improve blank internal soundness.
(1) the preferred heat in time of continuous casting gained blank delivers to soaking pit, and setting charging temperature is 600 ± 10 DEG C; If do not possess heat to send condition, soaking pit is delivered to again by after blank slow cooling, pad hot base bottom burial pit hole temperature to be remained on be greater than 50 DEG C, blank skin adds a cover woven asbesto, then insulation cover is covered, slow cooling 24 ~ 48h, blank goes out to cheat surface temperature control at 200 ~ 250 DEG C, blank carries out band temperature detector to blank surface behind hole and looks into from burial pit, is with temperature cleaning, flame cleaning temperature >=150 DEG C to defect, eliminate blank surface defect, improve product surface quality, to the blank entering to cheat slow cooling, setting charging temperature is not less than 150 DEG C;
(2) heat, the heat-up rate of setting stepwise soaking pit :≤1000 DEG C, heat-up rate is 80 ~ 100 DEG C/h; > 1000 DEG C, heat-up rate 50 ~ 70 DEG C/h; Maximum heating temperature 1280 DEG C, soaking temperature 1260 ± 10 DEG C, this heating and thermal insulation mode can guarantee the abundant solid solution of the alloying element of this composition blank, and ensures that autstenitic grain size is thick not too much;
(3) rolling, adopt shaped blank rolling technology, design " axial rolling → angular rolling → transverse rolling → axial rolling " technical process, start rolling temperature 1050 ~ 1100 DEG C, steel plate rolling adopts the large soft reduction process rolling of low speed, rolling gross distortion can guarantee that oval base rolling deformation can penetrate into strand centre portions, to eliminate the uneven deformation on thickness direction as much as possible; Axial rolling stage draught per pass 60 ~ 90mm, front four-pass pressure total amount >=300mm, the 5th to the tenth passage adopts 15 ° of angular rolling techniques to carry out blank broadening, finishing temperature >=900 DEG C; Adopt 3 ~ 5 sub-high pressure water de-scalings in the operation of rolling, ensure plate surface quality; Use edge rolling, ensure quality of edges; Suitably increase by 2 ~ 3 planishing passes in the operation of rolling, guarantee steel plate roughness≤3mm/m, to improve planeness and the surface quality of steel plate further;
(4) slow cooling, after rolling completes, by online for blank air cooling to 300 ± 50 DEG C, steel plate arrangement pitch >=1.5m, heap slow cooling of then rolling off the production line, heap slow cooling time >=48h;
(5) normalizing+tempering heat treatment, car type furnace is utilized to carry out normalizing+tempering heat treatment to steel plate, normalizing temperature 850 ~ 880 DEG C, soaking time 2min/mm, tempering temperature 550 ~ 600 DEG C, soaking time 3.5min/mm, normalizing contributes to the internal segregation slowing down mould of plastics slab, uniform steel sheet tissue, reduces same plate different place difference of hardness, obtains pre-hardening type mould of plastics slab.
Without macroscopic sand holes after the pre-hardening type mould of plastics slab sawing of above-mentioned explained hereafter.Steel plate appearance surfaces is bright and clean, flawless, scab, bubble, fold, be mingled with, the defect such as pit.As shown in Figure 1 to Figure 3, be the metallographic structure at mould slab different thickness place, slab is organized even in a thickness direction, is tempering bainite tissue.Thick plate structure segregation is little, and section hardness is evenly distributed, and whole plate difference of hardness is no more than 2HRC, and machinability is good, and polishing performance is excellent.Slab maximum ga(u)ge reaches 250mm, and flaw detection meets JB/4730.3-2005 standard level, and check inclusion according to ASTM E45 (A method), the total rank of inclusion is not more than 2.5 grades, and over-all properties is good.Utilize the thick steel of the special thick pre-hardening type mould of plastics of this explained hereafter, lumber recovery can reach more than 88%, and improve 8 ~ 11% than die casting technique of becoming a useful person, ton steel production cost reduces by more than 600 yuan.
Claims (9)
1. a special heavy plate production technique for plastic die steel, is characterized in that: become a useful person with continuous casting ф 1000mm large round billet, step comprises
(1) continuous casting gained blank heat delivers to soaking pit, and setting charging temperature is 600 ± 10 DEG C; If do not possess heat to send condition, soaking pit is delivered to again by after blank slow cooling, pad hot base bottom burial pit hole temperature to be remained on be greater than 50 DEG C, blank skin adds a cover woven asbesto, then cover insulation cover, slow cooling 24 ~ 48h, blank goes out to cheat surface temperature control at 200 ~ 250 DEG C, to the blank entering to cheat slow cooling, setting charging temperature is not less than 150 DEG C;
(2) heat, setting stepwise heat-up rate :≤1000 DEG C, heat-up rate is 80 ~ 100 DEG C/h; > 1000 DEG C, heat-up rate 50 ~ 70 DEG C/h; Maximum heating temperature 1280 DEG C, soaking temperature 1260 ± 10 DEG C;
(3) rolling, adopt " axial rolling → angular rolling → transverse rolling → axial rolling " technical process, start rolling temperature 1050 ~ 1100 DEG C, steel plate rolling adopts the large soft reduction process rolling of low speed, axial rolling stage draught per pass 60 ~ 90mm, front four-pass pressure total amount >=300mm, the 5th to the tenth passage adopts 15 ° of angular rolling techniques to carry out blank broadening, finishing temperature >=900 DEG C;
(4) slow cooling, after rolling completes, by blank air cooling to 300 ± 50 DEG C, steel plate spacing >=1.5m, heap slow cooling of then rolling off the production line, heap slow cooling time >=48h;
(5) normalizing+tempering heat treatment, normalizing temperature 850 ~ 880 DEG C, soaking time 2 ~ 4min/mm, tempering temperature 550 ~ 600 DEG C, soaking time 3.5 ~ 4.5min/mm, obtains pre-hardening type mould of plastics slab.
2. the special heavy plate production technique of plastic die steel according to claim 1, it is characterized in that: described ф 1000mm large round billet adopts straight arc continuous caster to carry out continuous casting, adopt Prepared by Low Superheat Pouring, molten steel overheat is 10 ~ 20 DEG C, and in crystallizer, configuration stirs the electromagnetic mixing apparatus of molten steel to reduce blank internal-external temperature difference; Two cold-zones arrange that atomized water refrigerating unit carries out atomization water-cooled to blank surface; Induction stirring and dynamic soft-reduction technique is adopted at molten steel solidification end.
3. the special heavy plate production technique of plastic die steel according to claim 1, is characterized in that: step (5) adopts car type furnace to carry out normalizing+tempering heat treatment to steel plate.
4. the special heavy plate production technique of plastic die steel according to claim 1, is characterized in that: in step (1), and blank is looked into blank surface band temperature detector behind hole from burial pit, is with temperature cleaning, flame cleaning temperature >=150 DEG C to defect.
5. the special heavy plate production technique of plastic die steel according to claim 1, is characterized in that: adopt 3 ~ 5 sub-high pressure water de-scalings in the operation of rolling, ensures plate surface quality.
6. the special heavy plate production technique of plastic die steel according to claim 1, is characterized in that: the operation of rolling uses edge rolling, ensures quality of edges.
7. the special heavy plate production technique of plastic die steel according to claim 1, is characterized in that: suitably increase by 2 ~ 3 passage flattening process in the operation of rolling, guarantee steel plate roughness≤3mm/m.
8. the special heavy plate production technique of the plastic die steel according to claim arbitrary in claim 1 to 7, is characterized in that: the thickness of gained pre-hardening type mould of plastics slab reaches 250mm.
9. the special heavy plate production technique of the plastic die steel according to claim arbitrary in claim 1 to 7, it is characterized in that: gained pre-hardening type mould of plastics slab is middle carbon high quality steel, by mass percentage, 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%, all the other are Fe and inevitable impurity.
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Cited By (12)
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| CN105624571A (en) * | 2016-03-10 | 2016-06-01 | 山东钢铁股份有限公司 | Super-thick steel plate and production technology thereof |
| CN105755238A (en) * | 2015-12-31 | 2016-07-13 | 柳州钢铁股份有限公司 | Rolling technology and heat treatment method of pre-hardening type plastic die steel |
| 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 |
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| CN110539140A (en) * | 2019-09-06 | 2019-12-06 | 鞍钢股份有限公司 | Production method of super-thick steel plate for pre-hardened plastic mold |
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| CN113265575A (en) * | 2021-04-26 | 2021-08-17 | 五矿营口中板有限责任公司 | Preparation method of extra-thick Mn-Cr series die steel |
| WO2021169621A1 (en) * | 2020-02-27 | 2021-09-02 | 江阴兴澄特种钢铁有限公司 | Pre-hardened mirror mold steel plate and manufacturing method therefor |
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