CN109136753A - A kind of manufacturing method of P80 high mirror-surface plastic die steel plate - Google Patents

A kind of manufacturing method of P80 high mirror-surface plastic die steel plate Download PDF

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CN109136753A
CN109136753A CN201810917702.4A CN201810917702A CN109136753A CN 109136753 A CN109136753 A CN 109136753A CN 201810917702 A CN201810917702 A CN 201810917702A CN 109136753 A CN109136753 A CN 109136753A
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steel plate
steel
furnace
temperature
plate
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CN109136753B (en
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刘小林
赵和明
廖桑桑
董富军
袁静
刘胜赫
操瑞宏
刘坚锋
扶利群
王琨铭
熊雄
李声延
闫博
潘津
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Xinyu Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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  • Physics & Mathematics (AREA)
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Abstract

The invention discloses a kind of manufacturing methods of P80 high mirror-surface plastic die steel plate, and steps are as follows: 1) 80% or more Ni plate and Cu plate being added before converter molten iron pours into, the molten steel Ni content and Cu content after making blowing respectively reach 2.50% and 0.80%；2) LF refining makes high basicity slag, and adduction gold carries out trimming, and molten steel is made；3) molten steel deaerates through RH/VD vacuum drying oven and cleans, [H]≤2ppm in outbound steel；4) continuous casting uses mould flux, and slab casting speed control is in 0.55 ~ 0.85m/min；5) blank deposits furnace time >=700 minute in heating furnace, and preheating temperature≤800 DEG C are rapidly heated to 1150 DEG C or more after preheating；6) on-line cooling after steel plate rolling opens 865 DEG C ~ 885 DEG C of cold temperature, cooling velocity >=5 DEG C/S；7) ageing treatment, 520 DEG C ~ 540 DEG C of holding temperature.The present invention is using converter+continuous casting+ultrafast cold technique production, and instead of electric furnace ,+molding+is dissolved production model offline, and high production efficiency realizes the mass production of the high mirror-surface plastic die steel of high quality P 80.

Description

A kind of manufacturing method of P80 high mirror-surface plastic die steel plate
Technical field
The present invention relates to mould steel manufacturing technology field more particularly to a kind of manufactures of P80 high mirror-surface plastic die steel plate Method.
Background technique
With the fast development of the industries such as electronics, automobile, motor, electric appliance, instrument, instrument, household electrical appliances, communication and military project, very Multiple component material surface requires bright in mirror surface performance, and high mirror-surface plastic die steel comes into being, and the market demand is increasingly Greatly, currently, domestic also a large amount of dependence imports.In general, the bright in mirror surface performance of steel is mainly by following factor controlling: material is Matrix based on martensite or bainite, it is desirable that crystal grain uniformly tiny, higher cleanliness, ideal hardness 39~ 45HRCBetween.Currently, be limited to the characteristic of technological equipment level and product requirement, the matrix based on martensite is still merely Do not occur, and the high mirror-surface plastic die steel based on bainite structure is in the majority, if matrix is low-carbon lath-shaped geneva Body+bainite bipolar mixture tissue is just got well than the matrix bright in mirror surface performance based on bainite.American-European-Japanese equal states' phase After having put into substantial contribution, the plastic die steel of the mirror surface performance based on bainite structure is developed, Typical Representative is Japan Trade mark NAK80.The steel category age hardening steel, is used low carbon content and is added by a certain percentage with Ni-Cu-Al ternary alloy three-partalloy and mention High-hardenability, while matrix being made to obtain maximum precipitation-hardening effect, the extremely tiny of Dispersed precipitate is obtained after ageing treatment Intermetallic compound Al3Ni and richness Cu phase.To ensure that this steel grade harden ability is good, uniform bainite structure is obtained, usually Also add the alloying elements such as Mn, Mo.In order to realize production domesticization, domestic Great Wall special steel, northeast special steel, Fushun special steel, Taiyuan Iron and Steel Co., Wugang Equal steel mills have also carried out the research and development of age-hardening mould steel in succession, but are all that electric furnace+molding form produces, long flow path, energy consumption height, Pollution is big, and production capacity is limited, not only can not meet the demand in market, and be not suitable with the sustainable development of current energy-saving and emission-reduction Exhibition.
Currently, the manufacturing process of high mirror-surface plastic die steel material has following two both at home and abroad:
1) electric furnace → external refining → electroslag remelting → ESR ingot → forge or roll cogging → rolling become a useful person (band steel) → it is offline Solid solution → timeliness → inspection → storage.
2) electric furnace → external refining → water-cooled die casting casting → rolling is become a useful person (cut deal) → offline solid solution → timeliness → inspection It tests → is put in storage.
Above-mentioned production method is electric furnace production procedure, and die casting process energy consumption is high, blank recovery rate is low, environmental pollution is big, It is not suitable with the social orientation of current energy-saving and emission-reduction and environmental protection.
Based on this, have tried to using converter+continuous casting+offline solid solution mode of manufacture P80 high mirror-surface plastic die steel material (letter Claim P80, similarly hereinafter), because Molten Steel Cleanliness controls bad, and cause Inner Quality of Billet poor or casting billet surface cracks, So that slab is scrapped, lose more than gain, therefore, is had no both at home and abroad using the high mirror-surface plastic die steel material of converter+continuous casting mode of manufacture Report, be all using being rolled into steel plate or band steel after molding.
Summary of the invention:
For existing electric furnace+molding+offline solid solution production method, the purpose of the present invention is use Converter+continuous casting+ultrafast cold mode of manufacture P80 high mirror-surface plastic die steel plate can avoid existing for electric furnace+molding production model not Foot, and cancel offline solid solution process and further decrease energy consumption, production efficiency is higher, is able to satisfy the large batch of demand in market.
A kind of manufacturing method of P80 high mirror-surface plastic die steel plate, using converter+continuous casting+ultrafast cold technique, comprising specific Processing step is as follows:
1) converter smelting: being added 80% or more Ni plate and Cu plate before converter molten iron pours into, and the molten steel after making blowing arrives Ni content and Cu content respectively reach 2.50% and 0.80% when LF refining furnace；
2) LF furnace refines: LF refining makes high basicity slag, and dual alkalinity R is controlled between 5.0~6.5, adduction gold carry out at Point fine tuning, makes chemical component weight percentage meet C:0.06~0.16%, and Mn:1.40~1.70%, Si:0.05~ 0.20%, S :≤0.010%, P :≤0.020%, Cr :≤0.30%, Mo:0.20~0.50%, Cu:0.80~1.25%, Ni:2.50~3.50%, Alt:0.7~1.30%, remaining is iron and inevitable impurity；
3) RH/VD vacuum drying oven degassing removal of impurities: calcium line, 1~2min of midfeather, soft blow argon are fed in two times after the broken sky of vacuum drying oven Time >=20min, [H]≤2ppm in outbound steel；
4) continuous casting: using mould flux, whole process protection casting, which includes that weight percent is CaO 35.0 ~39.0%, SiO225.0~32.0%, Al2O3≤ 4.0%, CaF218.0~22.0%, Na25.0~8.0%TC of O 3.0~ 5.0%, the chemical component and fusing point that dual alkalinity is 1.1~1.5 are 1080~1120 DEG C, 1300 DEG C of viscosity coefficient of dross are 0.05~ 0.12Pa.s, the physical property of slagging speed≤26 second, slab casting speed control exist in 0.55~0.85m/min, degree of superheat control 10 DEG C~30 DEG C；
5) heat: blank deposits furnace time >=700 minute in heating furnace, wherein it is small that blank in preheating section will at least preheat 2 When, preheating temperature≤800 DEG C are rapidly heated to 1150 DEG C or more after preheating；
6) ultrafast cold: on-line cooling after steel plate rolling opens 865 DEG C~885 DEG C of cold temperature, and cooling velocity >=5 DEG C/S are cooling To Ms transformation temperature；
7) timeliness: after steel plate is cooled to room temperature, tempering is carried out to steel plate, 520 DEG C~540 DEG C of holding temperature, is protected Warm time (5.5~6.5) × H minutes (H be steel plate thickness mm), steel plate are come out of the stove air-cooled, obtain low-carbon lath martensite+bayesian Body bipolar mixture tissue.
It is further preferred that a kind of manufacturing method of P80 high mirror-surface plastic die steel plate, using converter+continuous casting+ultrafast cold Technique, include the specific process steps are as follows:
1) converter smelting: being added 85% or more Ni plate and Cu plate before converter molten iron pours into, and the molten steel after making blowing arrives Ni content and Cu content respectively reach 2.50% and 0.80% when LF refining furnace；
2) LF furnace refines: LF refining makes high basicity slag, and dual alkalinity R is controlled between 5.5~6.5, adduction gold carry out at Point fine tuning, makes chemical component weight percentage meet C:0.06~0.16%, and Mn:1.40~1.70%, Si:0.05~ 0.20%, S :≤0.010%, P :≤0.020%, Cr :≤0.30%, Mo:0.20~0.50%, Cu:0.80~1.25%, Ni:2.50~3.50%, Alt:0.7~1.30%, remaining is iron and inevitable impurity；
3) RH/VD vacuum drying oven degassing removal of impurities: feeding calcium line in two times after vacuum drying oven is broken empty, midfeather 1min, when soft blow argon Between >=22min, [H]≤1.5ppm in outbound steel；
4) continuous casting: using mould flux, whole process protection casting, which includes that weight percent is CaO 35.0 ~39.0%, SiO225.0~32.0%, Al2O3≤ 4.0%, CaF218.0~22.0%, Na25.0~8.0%TC of O 3.0~ 5.0%, the chemical component and fusing point that dual alkalinity is 1.1~1.5 are 1080~1120 DEG C, 1300 DEG C of viscosity coefficient of dross are 0.05~ 0.12Pa.s, the physical property of slagging speed≤23 second, slab casting speed control exist in 0.55~0.85m/min, degree of superheat control 15 DEG C~25 DEG C；
5) heat: blank deposits furnace time >=720 minute in heating furnace, wherein it is small that blank in preheating section will at least preheat 2 When, preheating temperature≤800 DEG C are rapidly heated to 1180 DEG C or more after preheating；
6) ultrafast cold: on-line cooling after steel plate rolling opens 865 DEG C~885 DEG C of cold temperature, and cooling velocity >=8 DEG C/S are cooling To Ms transformation temperature；
7) timeliness: after steel plate is cooled to room temperature, tempering is carried out to steel plate, 530 DEG C~540 DEG C of holding temperature, is protected Warm time (5.5~6.5) × H minutes (H be steel plate thickness mm), steel plate are come out of the stove air-cooled, obtain low-carbon lath martensite+bayesian Body bipolar mixture tissue.
General thought of the invention is:
1, the degree of purity control of molten steel: since P80 plastic die steel is mainly for the manufacture of high mirror surface mould, surface polishing Afterwards there can be no any flaw, therefore P80 high mirror-surface plastic die steel must have a very high degree of purity, and specially lower three Gas (N, H, O) content and lower inclusion behavior.Using before converter molten iron pours into be added 80% or more Ni plate and Cu plate, The LF refining period can be shortened, avoid hydrogen and nitrogen in molten steel absorption air；The refining of LF furnace makes white slag using high alkalinity, and white slag is protected It holds the time >=10 minutes, refining slag can be enhanced and adsorb the ability being mingled with, obtain lower inclusion behavior, and use aluminium block Deoxidation is carried out, Control for Oxygen Content is in 30ppm or less；It is refined using RH furnace or VD vacuum drying oven, it is ensured that [H]≤2ppm in outbound steel, Molten steel pernicious gas and field trash are further controlled, longer soft argon blowing time is kept, may advantageously facilitate field trash and sufficiently float, Improve Molten Steel Cleanliness.
2, the inside and outside quality control of slab: high-alloy steel sheet billet continuous casting to the force-power parameter of conticaster and required precision compared with Height, especially P80 contain higher Al content, and molten steel toughness is larger, such as pouring temperature, pulling rate, two cold water distributions controls are bad, Will it is easy to appear bleed-out, crackle and layering the problems such as.Continuous casting uses mould flux, and controls Al2O3≤ 4.0%, it is whole Molding casting, slab casting speed control are controlled in 0.55~0.85m/min, the degree of superheat at 10 DEG C~30 DEG C, efficiently solve these Problem.
3, steel plate on-line solution quality controls: solution treatment is to enable all kinds of alloying elements in steel to be dissolved as far as possible It is the key that good precipitation-hardening can be obtained in subsequent ageing treatment, and steel plate on-line solution is logical in matrix The ultrafast cool equipment crossed after rolling realizes the solid solution effect of all kinds of alloying elements in its steel, so that the out-line quenching of steel plate is substituted, Reduce by one of manufacturing process, therefore, how rationally to control steel plate open cold temperature, final cooling temperature, cooling rate, on be lauched than etc. will be The key technical problem of steel plate realization on-line solution.It is continuous that dynamic has been carried out to P80 steel plate using Gleebe-3800 thermal simulation machine Cooling curve measurement, the primary condition of test steel measurement CCT curve are as follows: be heated to 1200 DEG C with 1 DEG C/s heating speed, heat preservation 2 Minute, 1000 DEG C are dropped to 5 DEG C/s cooling velocity, keeps the temperature 30s, then press 5s-1Speed deformation 40%, respectively press 50 DEG C/s, 30 DEG C/s, 15 DEG C/s, 10 DEG C/s, 5 DEG C/s, 2 DEG C/s, 1 DEG C/s, 1000 DEG C/h, 500 DEG C/h, 200 DEG C/h be cooled to room temperature, measure The dynamic continuous cooling curve of steel plate is as shown in Figure 1, can be seen that the reduction with cooling velocity, phase from the CCT curve of Fig. 1 Transition temperature rises, and when cooling velocity is less than 2 DEG C/s, starting temperature of transformation variation is little；When cooling velocity is greater than 15 DEG C/s When, it obtains being martensitic structure, with the reduction of cooling velocity, bainite content increases.Accordingly, open cold temperature 865 DEG C~ 885 DEG C, cooling velocity >=5 DEG C/S is controlled, is cooled to Ms transformation temperature hereinafter, the effect being dissolved offline may be implemented, to save The steel plate reheating energy, and low-carbon lath martensite+bainite bipolar mixture tissue best at present is obtained after timeliness.
Compared with prior art, the present invention its advantage is that overcome using converter producing P80 high mirror-surface plastic die steel, because Molten Steel Cleanliness controls bad and easily leads to the technical bottleneck that Inner Quality of Billet is poor or casting billet surface cracks, using turning Furnace+continuous casting+ultrafast cold technique production, instead of electric furnace ,+molding+is dissolved production model offline, and advanced optimizes, instead of Traditional offline solid solution treatment process, enormously simplifies the technological process of production, and high production efficiency shortens the production cycle, simultaneously The energy that steel plate is dissolved reheating offline has been saved, manufacturing cost is reduced, has realized the high mirror-surface plastic die of high quality P 80 The mass production of steel plate.
Detailed description of the invention
Fig. 1 is P80 steel continuous cooling transformation CCT curve.
Fig. 2 is martensite+bainite bipolar mixture matrix after the ultrafast cold on-line solution of P80 steel of the present invention.
Fig. 3 is low-carbon lath martensite+bainite bipolar mixture matrix after P80 steel timeliness of the present invention.
Specific embodiment
Below with reference to embodiment, the invention will be further described.
P80 high mirror-surface plastic die steel plate in the following example is chemical component designed by the present invention, production stream Prepared by journey and production technology.
1) production procedure: molten iron → desulfurization → converter → Argon → LF furnace → RH/VD vacuum drying oven → sheet billet continuous casting → slab Scale → slab slow cooling → heating rolling → ultrafast cooling → timeliness → inspection storage；
2) processing step:
(1) converter smelting: taking top and bottom complex blowing oxygen coverter to be smelted, and 80% or more is added before converter molten iron pours into Ni plate and Cu plate, pour into a large amount of Ni plate and Cu plate in molten iron and melted with converting process, Ni contains when molten steel is to LF refining furnace Amount and Cu content respectively reach 2.50% and 0.80%, the purpose for the arrangement is that the LF refining period is greatly shortened, effectively avoid In LF refining process due to a large amount of Ni plate and Cu plate are added caused by temperature drop, while avoiding molten steel heating overlong time and adsorbing Hydrogen and nitrogen in air improve slab quality, terminal point control requirement: C :≤0.06%, P :≤0.010%, S :≤0.020%, Tapping uses floating plug slag-stopping tapping, and when tapping carries out wash heat, and all using aluminium block progress deoxidation, Control for Oxygen Content is in 30ppm Below；
(2) LF furnace refines: adding 800~1200kg of lime, 80~150kg of fluorite, refining slag binary when LF refining furnace processing Basicity R (CaO/SiO2) it is 5.0~6.5, Al2O318.0~22.0%, it energization slugging 6~10 minutes, is added Al and makes white slag, White slag retention time >=10 minute reinforce refining slag and adsorb the ability being mingled with, alloy ferrosilicon, manganese metal, nickel plate, molybdenum is then added Iron, copper sheet make chemical component weight percentage meet C:0.06~0.16%, and Mn:1.40~1.70%, Si:0.05~ 0.20%, S :≤0.010%, P :≤0.020%, Cr :≤0.30%, Mo:0.20~0.50%, Cu:0.80~1.25%, Ni:2.50~3.50%, Alt:0.7~1.30%, remaining is iron and inevitable impurity；
(3) RH furnace or the refining of VD vacuum drying oven: final vacuum≤20Pa when RH refining furnace is vacuum-treated, vacuum processing time >=20min, pure degassing time >=15min, removes removing and harmful gas H, N, it is ensured that [H]≤2ppm in outbound steel, break it is empty after in two times Calcium line is fed, 1~2min of midfeather feeds pure calcium line, and 250~300m of total length makes inclusion balling, after treatment soft blow argon >=20min, the control of soft blow argon flow promote field trash sufficiently to float in 80~100NL/min；Or use VD refining furnace vacuum Final vacuum≤45Pa when processing, vacuum processing time >=25min, ultimate vacuum retention time >=20min remove harmful gas Body H, N, it is ensured that [H]≤2ppm in outbound steel feeds calcium line after breaking sky in two times, and 1~2min of midfeather feeds pure calcium line, overall length 350~400m is spent, inclusion balling is made, guarantees soft argon blowing time >=20min, soft blow argon flow is controlled in 10~20Nm3/ h, Field trash is promoted sufficiently to float；
(4) continuous casting: a, crystallizer use weak cold technology, adjust the wide face of crystallizer and leptoprosopy water according to slab thickness；b, Using mould flux, whole process protection casting, which includes that weight percent is CaO 35.0~39.0%, SiO225.0~32.0%, Al2O3≤ 4.0%, CaF218.0~22.0%, Na2O 5.0~8.0%, TC 3.0~5.0%, two First basicity (CaO/SiO2) it is 1.1~1.5 chemical component and fusing point is 1080~1120 DEG C, 1300 DEG C of viscosity coefficient of dross are 0.05 ~0.12Pa.s, the physical property of slagging speed≤26 second；C, the mould flux is described as follows: basicity setting is higher than conventional (conventional 0.8 or less) is conducive to improve crystallization rate, improves thermal resistance, keep green shell uniform, while high alkalinity can reduce the glutinous of melt cinder Degree improves mobility, reinforces lubricant effect；It is high (more conventional by 1.5 or less) than conventional to control the full carbon content of covering slag, is conducive to improve The molten speed of covering slag；Limit Al in covering slag2O3Content, can control melt cinder inhale aluminium after physical property variation (P80 aluminium content It is high), to reduce the viscosity of melt cinder, improves slag flow, make slagging speed≤26 second；D, slab casting speed control 0.55~ 0.85m/min, the degree of superheat are controlled at 10 DEG C~30 DEG C, prevent slab drawing crack；E, enter to cheat slow cooling after slab cutting, slow cooling time >= 48 hours, blank entered to cheat temperature not less than 700 DEG C, is conducive to the abundant release of slab internal hydrogen, inside is avoided to crack, Guarantee that flaw detection is qualified；F, these measures effectively prevent the generation of slab crackle, the matching of specific slab thickness pulling rate and the degree of superheat It is shown in Table 1:
The matching of table 1 P80 steel pulling rate and the degree of superheat
(5) heat: blank deposits furnace time >=700 minute in heating furnace, wherein it is small that blank in preheating section will at least preheat 2 When, preheating temperature≤800 DEG C are rapidly heated to 1150 DEG C or more after preheating, effectively avoid generating " copper is split ", and guarantee to close Gold can be dissolved completely；
(6) ultrafast cold: blank is rolled using recrystallization zone, start rolling temperature >=1000 DEG C, finishing temperature >=880 DEG C, blank It is rolled into after steel plate on roller-way to temperature, then cooling into UFC (ultrafast cool equipment), opens 865 DEG C~885 DEG C of cold temperature, cooling speed It spends >=5 DEG C/S, is cooled to Ms transformation temperature hereinafter, obtaining coarse martensite+bainite bipolar mixture matrix (see Fig. 2)；
(7) timeliness: after steel plate is cooled to room temperature, tempering is carried out to steel plate, 520 DEG C~540 DEG C of holding temperature, is protected Warm time (5.5~6.5) × H minutes (H be steel plate thickness mm), steel plate are come out of the stove air-cooled, obtain crystal grain uniformly tiny low carbon board Strip martensite+bainite bipolar mixture tissue (see Fig. 3).
Embodiment 1:
1) production procedure: molten iron → desulfurization → converter → Argon → LF furnace → RH furnace → sheet billet continuous casting → slab scale → plate Base slow cooling → heating rolling → ultrafast cooling → timeliness → storage；
2) processing step:
(1) converter smelting: 85% Ni plate and Cu plate are added before 100 tons of top and bottom complex blowing oxygen coverter blowing, specially 2.8 tons of nickel plates and 0.9 ton of copper sheet are added in converter burner hearth, pours into molten iron, blows, Ni plate and Cu plate is made to pour into and blow in molten iron Process melt is refined, nickel content and copper content are respectively 2.52% and 0.85% when molten steel is to LF refining furnace, terminal: C:0.05%, P:0.008%, S:0.010%, tapping use floating plug slag-stopping tapping, and when tapping carries out wash heat, are all taken off using aluminium block Oxygen, oxygen content: 25ppm；
(2) LF furnace refines: molten steel adds lime 1000kg into 100 tons of LF refining furnace websites, adds fluorite 140kg, detection refining Slag CaO54.2%, SiO28.6%, Al2O319.0%, dual alkalinity R (CaO/SiO2) it is 6.30, it energization slugging 8 minutes, is added Al are made white slag, and the white slag retention time 12 minutes, alloy ferrosilicon, manganese metal, nickel plate, molybdenum-iron, copper sheet, trimming is then added Detection chemical component is C 0.10%, Mn 1.50%, Si 0.12%, S 0.003%, P 0.010% by weight percentage afterwards, Cr 0.01%, Mo 0.25%, Cu 0.95%, Ni 2.9%, Alt 0.89%；
(3) RH furnace refines: final vacuum 15Pa, vacuum processing time 22min when 100 tons of RH refining furnaces are vacuum-treated, Pure degassing time 18min, [H] 1.2ppm in outbound steel, break it is empty after feed calcium line, midfeather 1min in two times, calcium is respectively fed in front and back Line 130m, soft blow time are 22min, and soft blow argon flow is controlled in 90NL/min；
(4) continuous casting: the wide face of crystallizer and leptoprosopy water are controlled as 4075L/min and 410L/min when continuous casting is cast, Water Rate for Secondary Cooling Water 0.5L/kg, while mould flux is used, detect CaO 36.84%, SiO228.91%, Al2O32.46%, CaF220.0%, Na2O 6.0%, TC 3.97%, dual alkalinity CaO/SiO2It is 1.27,1100 DEG C of fusing point, 1300 DEG C of slags are viscous 0.10Pa.s is spent, slagging speed 25 seconds, whole process protection casting, slab casting speed control was controlled in 0.85m/min, the degree of superheat 20 DEG C, the P80 slab of 250mm thickness is produced, enters to cheat slow cooling after slab cutting, slow cooling time 48 hours, blank entered to cheat temperature 760 ℃；
(5) heat: blank preheats 2.1 hours, 780 DEG C of preheating temperature into after walking beam reheating furnace in preheating section.Slab adds 1200 DEG C of hot arc temperature, heating total time controlled by 768 minutes；
(6) ultrafast cold: blank is rolled into 21mm steel plate, 1050 DEG C of start rolling temperature, is rolled using recrystallization zone, finishing temperature It is 930 DEG C, cooling into UFC equipment in roller-way after warm to 885 DEG C after the completion of rolling, 15 DEG C/S of cooling velocity, red temperature It 350 DEG C, obtains martensitic matrix tissue (see Fig. 1), ultrafast cold technological parameter is shown in Table 2.
The 2 ultrafast cold technological parameter of 21mm thickness P80 steel plate of table
(7) timeliness: after steel plate is cooled to room temperature, to steel plate carry out tempering, 528 DEG C of holding temperature, time inside furnace 120 minutes temperings, steel plate are come out of the stove air-cooled, obtain crystal grain uniformly tiny low-carbon lath martensite+bainite two-phase Line and staff control (see Fig. 3), hardness 42HRC.
Embodiment 2:
1) production procedure: molten iron → desulfurization → converter → Argon → LF furnace → VD furnace → sheet billet continuous casting → slab scale → plate Base slow cooling → heating rolling → ultrafast cooling → timeliness → storage
2) processing step:
(1) 5.7 tons of nickel plates and 1.7 tons of copper sheets, molten steel to LF refining furnace converter smelting: are added in 210 tons of converter burner hearths When nickel content and copper content be respectively 2.59% and 0.88%, terminal: C:0.06%, P:0.010%, S:0.009%, tapping are adopted With floating plug slag-stopping tapping, when tapping, carries out wash heat, all carries out deoxidation, oxygen content: 28ppm using aluminium block；
(2) LF furnace refines: molten steel adds lime 2000kg into 210 tons of LF refining furnace websites, adds fluorite 300kg, detection refining Slag CaO52.8%, SiO29.9%, Al2O321.0%, dual alkalinity R (CaO/SiO2) it is 5.33, it energization slugging 9 minutes, is added Al are made white slag, and the white slag retention time 14 minutes, alloy ferrosilicon, manganese metal, nickel plate, molybdenum-iron, copper sheet, trimming is then added Detection chemical component is C 0.11%, Mn 1.45%, Si 0.10%, S 0.002%, P 0.012% by weight percentage afterwards, Cr 0.01%, Mo 0.26%, Cu 0.93%, Ni 3.1%, Alt 0.90%；
(3) VD furnace refines: final vacuum 20Pa when being vacuum-treated using 210 tons of VD refining furnaces, vacuum processing time 28min, ultimate vacuum retention time 22min, [H] 1.5ppm in outbound steel, break it is empty after feed calcium line in two times, feed pure calcium for the first time Line 200m fed pure calcium line 180m, soft argon blowing time 21min second after 1 minute, and soft blow argon flow is controlled in 16Nm3/h；
(4) continuous casting: the wide face of crystallizer and leptoprosopy water are controlled as 4378L/min and 602L/min when continuous casting is cast, Water Rate for Secondary Cooling Water 0.33L/kg, while mould flux is used, detect CaO 38.34%, SiO228.11%, Al2O32.21%, CaF221.2%, Na2O7.6%, TC 4.37%, dual alkalinity CaO/SiO2It is 1.36,1090 DEG C of fusing point, 1300 DEG C of slags are viscous 0.09Pa.s is spent, slagging speed 22 seconds, whole process protection casting, slab casting speed control was controlled in 0.65m/min, the degree of superheat 22 DEG C, the P80 slab of 360mm thickness is produced, enters to cheat slow cooling after slab cutting, slow cooling time 48 hours, blank entered to cheat temperature 780 ℃；
(5) heat: blank preheats 2.2 hours, 770 DEG C of preheating temperature into after walking beam reheating furnace in preheating section.Slab adds 1215 DEG C of hot arc temperature, heating total time controlled by 829 minutes；
(6) ultrafast cold: blank is rolled into 61mm steel plate, 1050 DEG C of start rolling temperature, is rolled using recrystallization zone, finishing temperature It is 920 DEG C, cooling into UFC equipment in roller-way after warm to 878 DEG C after the completion of rolling, 6 DEG C/S of cooling velocity, red temperature 393 DEG C, coarse martensite+bainite bipolar mixture tissue (see Fig. 2) is obtained, ultrafast cold technological parameter is shown in Table 3.
The 3 ultrafast cold technological parameter of 61mm thickness P80 steel plate of table
(7) timeliness: after steel plate is cooled to room temperature, to steel plate carry out tempering, 532 DEG C of holding temperature, time inside furnace 330 minutes temperings, steel plate are come out of the stove air-cooled, obtain crystal grain uniformly tiny low-carbon lath martensite+bainite two-phase Line and staff control (see Fig. 3), hardness 40HRC.

Claims (2)

1. a kind of manufacturing method of P80 high mirror-surface plastic die steel plate, which is characterized in that use converter+continuous casting+ultrafast cold work Skill, include the specific process steps are as follows:
1) converter smelting: being added 80% or more Ni plate and Cu plate before converter molten iron pours into, the molten steel after making blowing to LF refining Ni content and Cu content respectively reach 2.50% and 0.80% when furnace；
2) LF furnace refines: LF refining makes high basicity slag, and dual alkalinity R is controlled between 5.0 ~ 6.5, and it is micro- that adduction gold carries out ingredient It adjusts, chemical component weight percentage is made to meet C:0.06 ~ 0.16%, Mn:1.40 ~ 1.70%, Si:0.05 ~ 0.20%, S :≤ 0.010%, P :≤0.020%, Cr :≤0.30%, Mo:0.20 ~ 0.50%, Cu:0.80 ~ 1.25%, Ni:2.50 ~ 3.50%, Alt: 0.7 ~ 1.30%, remaining is iron and inevitable impurity；
3) RH/VD vacuum drying oven degassing removal of impurities: calcium line, 1 ~ 2min of midfeather, soft argon blowing time are fed in two times after the broken sky of vacuum drying oven >=20min, [H]≤2ppm in outbound steel；
4) continuous casting: use mould flux, whole process protection casting, the covering slag include weight percent be CaO 35.0 ~ 39.0%, SiO2 25.0 ~ 32.0%, Al2O3 ≤ 4.0%, CaF218.0 ~ 22.0%, Na25.0 ~ 8.0% TC 3.0 ~ 5.0% of O, The chemical component and fusing point that dual alkalinity is 1.1 ~ 1.5 are 1080 ~ 1120 DEG C, and 1300 DEG C of viscosity coefficient of dross are 0.05 ~ 0.12Pa.s, The physical property of slagging speed≤26 second, slab casting speed control are controlled in 0.55 ~ 0.85m/min, the degree of superheat at 10 DEG C ~ 30 DEG C；
5) heat: blank deposits furnace time >=700 minute in heating furnace, wherein blank will at least preheat 2 hours in preheating section, in advance Hot temperature≤800 DEG C are rapidly heated to 1150 DEG C or more after preheating；
6) ultrafast cold: on-line cooling after steel plate rolling opens 865 DEG C ~ 885 DEG C of cold temperature, and cooling velocity >=5 DEG C/S are cooled to Ms Below transformation temperature；
7) timeliness: after steel plate is cooled to room temperature, to steel plate carry out tempering, 520 DEG C ~ 540 DEG C of holding temperature, soaking time (5.5~6.5) × H minutes (H be steel plate thickness mm), steel plate was come out of the stove air-cooled, obtained low-carbon lath martensite+bainite two-phase Line and staff control.
2. a kind of manufacturing method of P80 high mirror-surface plastic die steel plate according to claim 1, which is characterized in that use Converter+continuous casting+ultrafast cold technique, include the specific process steps are as follows:
1) converter smelting: being added 85% or more Ni plate and Cu plate before converter molten iron pours into, the molten steel after making blowing to LF refining Ni content and Cu content respectively reach 2.50% and 0.80% when furnace；
2) LF furnace refines: LF refining makes high basicity slag, and dual alkalinity R is controlled between 5.5 ~ 6.5, and it is micro- that adduction gold carries out ingredient It adjusts, chemical component weight percentage is made to meet C:0.06 ~ 0.16%, Mn:1.40 ~ 1.70%, Si:0.05 ~ 0.20%, S :≤ 0.010%, P :≤0.020%, Cr :≤0.30%, Mo:0.20 ~ 0.50%, Cu:0.80 ~ 1.25%, Ni:2.50 ~ 3.50%, Alt: 0.7 ~ 1.30%, remaining is iron and inevitable impurity；
3) RH/VD vacuum drying oven degassing removal of impurities: feeding calcium line in two times after vacuum drying oven is broken empty, midfeather 1min, and soft argon blowing time >= 22min, [H]≤1.5ppm in outbound steel；
4) continuous casting: use mould flux, whole process protection casting, the covering slag include weight percent be CaO 35.0 ~ 39.0%, SiO2 25.0 ~ 32.0%, Al2O3 ≤ 4.0%, CaF218.0 ~ 22.0%, Na25.0 ~ 8.0% TC 3.0 ~ 5.0% of O, The chemical component and fusing point that dual alkalinity is 1.1 ~ 1.5 are 1080 ~ 1120 DEG C, and 1300 DEG C of viscosity coefficient of dross are 0.05 ~ 0.12Pa.s, The physical property of slagging speed≤23 second, slab casting speed control are controlled in 0.55 ~ 0.85m/min, the degree of superheat at 15 DEG C ~ 25 DEG C；
5) heat: blank deposits furnace time >=720 minute in heating furnace, wherein blank will at least preheat 2 hours in preheating section, in advance Hot temperature≤800 DEG C are rapidly heated to 1180 DEG C or more after preheating；
6) ultrafast cold: on-line cooling after steel plate rolling opens 865 DEG C ~ 885 DEG C of cold temperature, and cooling velocity >=8 DEG C/S are cooled to Ms Below transformation temperature；
7) timeliness: after steel plate is cooled to room temperature, to steel plate carry out tempering, 530 DEG C ~ 540 DEG C of holding temperature, soaking time (5.5~6.5) × H minutes (H be steel plate thickness mm), steel plate was come out of the stove air-cooled, obtained low-carbon lath martensite+bainite two-phase Line and staff control.
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CN112575144A (en) * 2020-11-21 2021-03-30 首钢京唐钢铁联合有限责任公司 Method for improving flaw detection qualification rate of medium plate
CN114855061A (en) * 2022-07-05 2022-08-05 中特泰来模具技术有限公司 Mirror surface plastic die steel and preparation method thereof
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CN104611642A (en) * 2014-11-26 2015-05-13 中原特钢股份有限公司 Production method of NAK80 high-grade mirror surface plastic rubber mold material for mobile phone mold
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CN102198504A (en) * 2011-06-27 2011-09-28 南京钢铁股份有限公司 Production technology of mirror-surface plastic die steel
JP2015045071A (en) * 2013-08-29 2015-03-12 山陽特殊製鋼株式会社 Steel for anticorrosive plastic molding die excellent in specularity
CN103981461A (en) * 2014-05-30 2014-08-13 秦皇岛首秦金属材料有限公司 X90 pipeline steel wide and thick plate and production method thereof
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