CN110241358A - Novel body structural member die-casting die steel and its preparation process - Google Patents

Novel body structural member die-casting die steel and its preparation process Download PDF

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Publication number
CN110241358A
CN110241358A CN201910666292.5A CN201910666292A CN110241358A CN 110241358 A CN110241358 A CN 110241358A CN 201910666292 A CN201910666292 A CN 201910666292A CN 110241358 A CN110241358 A CN 110241358A
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die
temperature
steel
structural member
preparation process
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姚杰
王春涛
周云海
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NINGBO HELI MOULD TECHNOLOGY Co Ltd
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NINGBO HELI MOULD TECHNOLOGY Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2209—Selection of die materials
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

A kind of novel body structural member die-casting die steel and its preparation process, mould steel provided by the invention include the following components'mass percentage: C:0.25~0.35%, Si:0.20~0.40%, Mn:0.20~0.60%, P≤0.002%, S≤0.001%, Cr:7~9%, Mo:2.5~3.5%, V:0.30~0.50%, W:0.40~0.60%, Nb:0.10~0.30%, N:0.005~0.10%, Ti:0.05~0.20%, surplus are Fe and inevitable impurity.To which novel body structural member die-casting die steel has good harden ability, wearability and thermal fatigue resistance.

Description

Novel body structural member die-casting die steel and its preparation process
Technical field
The present invention relates to Steel material technical fields, specifically, be a kind of novel body structural member die-casting die steel and its Preparation process.
Background technique
Automobile structure is the composition that bearing vehicle body plays the role of support and carrying, is the installation foundation of vehicle body parts. With the development of automotive light weight technology, more and more body structural members use almag Die Casting.Inner plate of car door, damping The body structural members die casting such as tower, in length and breadth beam, instrument board, boot boot is often larger, single mold weight often beyond 40 tons, monoblock modules outer dimension is more than 1000mm.Common die-casting die steel is using Sweden QRO90 as representative both at home and abroad at present Cr content be 3% Series Steel and by the Cr content that represents of U.S. H13 as 5% Series Die Steel.Such mould steel Tissue segregation between irregular sub-micron martensite is distributed 40-70nm carbide, has good comprehensive performance to lead in die casting Domain is widely used.But such mould steel is when making full-sized car structural member die casting, since harden ability is not good enough, It is easy to produce the incomplete transformation of pro-eutectoid ferrite, proeutectoid carbide, the precipitation of coarse bainite and austenite, is caused It cracks in mold use process.
Summary of the invention
The main purpose of the present invention is to provide a kind of novel body structural member die-casting die steel and its preparation process, gram Take the deficiencies in the prior art, broken domestic and international advanced hot die steel it is traditional in, the constraint of low Cr content, take high Cr to contain The new alloy ingredient of amount designs, and has good harden ability, improves the wear-resistant of hot die steel, anti-erosion and antiscour Ability.
To achieve the above objectives, a kind of the technical solution adopted by the present invention are as follows: novel body structural member die casting ladle Include the component of following mass percent: C:0.25~0.35%, Si:0.20~0.40%, Mn:0.20~0.60%, P≤ 0.002%, S≤0.001%, Cr:7~9%, Mo:2.5~3.5%, V:0.30~0.50%, W:0.40~0.60%, Nb: 0.10~0.30%, N:0.005~0.10%, Ti:0.05~0.20%, surplus are Fe and inevitable impurity.
An embodiment according to the present invention, the novel body structural member die-casting die steel includes following mass percent Component: C:0.28~0.32%, Si:0.20~0.40%, Mn:0.20~0.60%, P≤0.002%, S≤0.001%, Cr: 7.50~8.50%, Mo:2.80~3.20%, V:0.30~0.50%, W:0.40~0.60%, Nb:0.10~0.30%, N: 0.005~0.10%, Ti:0.05~0.20%, surplus are Fe and inevitable impurity.
A kind of preparation process of novel body structural member die-casting die steel comprising step:
Aluminium is added in two portions in S100 intermediate frequency (IF) smelting, high temperature refinery, comprehensive deoxidation, after steel scrap is melting down, corresponding iron is added and closes V-Fe is added before tapping in gold, in 1600~1650 DEG C of slotting aluminium tappings, carries out composite inoculating using method is poured in packet, breeds, purifies Processing；
S200 electroslag remelting process is segmented feeding；
S300 forging technology, using segmentally heating, heating speed is no more than 200 DEG C/h, and initial forging temperature is 1250 DEG C, Final forging temperature is 850 DEG C, is pulled out using three upsettings three, and forging ratio is greater than 6；
S400 homogenization and Grain Refinement keep the temperature 24 hours using 1250 DEG C, the cold progress high-temperature homogenization diffusion of furnace Processing, using 1130 DEG C of air-cooled carry out ultra fine-grained process twice, using complete annealing process；
The process and heat treatment of S500 mold, die cast, using 1080 DEG C of quenchings, 600 DEG C of double temperings after roughing Heat treatment, finishing.
The specific steps of an embodiment according to the present invention, the step S200 include:
S210 guarantees that electrode welding is closely knit, guarantees concentric centering, removes joint flash and oxide；
S220 graphite slugging, low level send slag to open arc；
S230 coordination electrode insertion depth improves corresponding molten speed；
S240 exchanges high-power temperature raising before electrode, changes to electrode crawl power transmission, slowly adjusts after triggering；
S250 guarantees that dummy ingot is smooth, checks crystallizer interior surface and both ends deformation
An embodiment according to the present invention, the step S200 further comprises step S260: with killing Ti powder or Al powder, mid-term adjust slag charge, above in three times to be added, and proportion is 20% aluminium oxide and 80% calcirm-fluoride.
An embodiment according to the present invention uses medium-frequency induction furnace, basic lining, non-oxidizing process in the step S100 Process for making, first 5~10 minutes guarantee ingredients of tapping and temperature are suitable, take terminal sample within 10 minutes after alloying, are added in two portions Aluminium, 0.5kg in forehearth of tapping, adds 0.5kg when tapping one third in ladle.
An embodiment according to the present invention wraps interior composite modifier composition are as follows: Y, Ce, Ti-Fe, Si-Ca, granularity 5 ~10mm.
An embodiment according to the present invention, annealing temperature are 350 DEG C.
Compared with the existing technology, the invention has the benefit that
(1) broken domestic and international advanced hot die steel it is traditional in, low Cr content (Cr:1-5.5wt.%, Cr/C (wt.%): 6.7-15.7 constraint) proposes high-Cr (Cr:7.5~8.5wt.%, Cr/C (wt.%): 26-30) New design of alloy has good harden ability, obtains 10~20nm carbide in nanometer (40-50nm) low-carbon lath horse Family name's body intergranular is in the Strengthening and Toughening tissue of the dense oxidation film of laminar configuration and resistance to high temperature oxidation；
(2) it improves the red hard of New Hot Work Die Steel by elements such as optimized alloy ingredient C, Cr, Co, Mo, W, V, N Property, thermal stability, inoxidizability etc.；Crystal grain is refined by the way that Ti, Y, Ce, Si-Ca is added, reduces harmful member such as O, S in molten steel Element and improvement inclusion morphology and solidified structure, improve the wearability and obdurability of novel body structural member die-casting die steel；It mentions The service life of high hot-work die and the working efficiency of equipment and reduction die manufacturing cost；
(3) it designs, breed, going bad by optimized alloy ingredient, microalloying etc., improving the wear-resistant of hot die steel The abilities such as damage, anti-erosion and antiscour improve the service life of hot-work die and the working efficiency of equipment and reduce mold manufacture Cost；
(4) it is generated by changing the element mixed ratio of C and Cr to reduce Cr7C3, Cr23C6；The addition of Co can increase Diffusion velocity of the carbon in austenite, Co are able to ascend elevated temperature strength in the alloy, and facing for steel can be improved in phase transition process Boundary's temperature can reduce the adverse effect of Cr to accelerate phase transition process to a certain extent；The disperse in the alloy of each element Distribution, is initially formed solidification core in the process, forms crystal grain with this core, crystal grain becomes smaller；Ti is strong deoxidier, can be effective Reduce oxygen content；Si can significantly improve the elastic limit, yield point and tensile strength of steel, meanwhile, Si is as reducing agent and deoxidation Agent can effectively reduce the oxygen in molten steel.
(5) it anneals at 350 DEG C after mould steel is made, crystal grain refinement is achieved the purpose that by recrystallization, is increased with this The intensity and hardness of strong mould steel.
Specific embodiment
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.
Embodiment 1: damping tower die casting
(1) chemical component
Novel body structural member die-casting die steel weight percent composition is as follows: C:0.280；Si:0.200；Mn:0.200； P:0.002；S:0.0008；Cr:7.5；Mo:2.800；V:0.300；W:0.400；Nb:0.100；N:0.005；Ti:0.050.
(2) intermediate frequency (IF) smelting technique
Using 3000Kg medium-frequency induction furnace, basic lining, non-oxidizing process process for making.A small amount of bottom ash, high-power fusing； Change clear rear sampling in time；High temperature refinery, comprehensive deoxidation, first 5~10 minutes guarantee ingredients of tapping and temperature are suitable, and clinker is pure white； Take terminal sample within 10 minutes after alloying；Sulphur phosphorus content actual requirement P≤0.02, S≤0.0008.Final deoxidizing is added in two times with Al Enter, 1.5 kilograms in forehearth of tapping, adds 1 kilogram when tapping one third in ladle.After steel scrap is melting down, various ferroalloys are added V-Fe is added before tapping in (Cr-Fe, Mo-Fe, Ni etc.), in 1600~1650 DEG C of slotting Al tappings, is answered using method is poured in packet Conjunction goes bad, breeds, purified treatment, wrap in composite modifier composition are as follows: Y, Ce, Ti-Fe, Si-Ca, granularity are 5~10mm.
(3) electroslag remelting process
Guarantee that electrode welding is closely knit, guarantee concentric centering, removes joint flash and oxide；Graphite slugging, low level send slag to open Arc；Coordination electrode insertion depth properly increases molten speed；High-power temperature raising before exchange electrode, changes to electrode crawl power transmission, after triggering Slowly adjustment；The integrality for guaranteeing electrode, prevents chip off-falling；Guarantee that dummy ingot is smooth, checks crystallizer interior surface and both ends deformation Situation；Suitably match killing Ti or Al powder；Mid-term adjusts 15 kilograms of slag charge, above in three times to be added, and matches 20%Al2O3+ 80%CaF2；It is segmented feeding.
(4) forging technology
Using segmentally heating, heating speed is no more than 200 DEG C/h, and initial forging temperature is 1250 DEG C, final forging temperature 850 ℃.It is pulled out using three upsettings three, forging ratio is greater than 6.
(5) homogenization and Grain Refinement
Using 1250 DEG C keep the temperature 24 hours, the cold progress high-temperature homogenization DIFFUSION TREATMENT of furnace, using 1130 DEG C it is air-cooled twice just Ultra fine-grained process is carried out well, using complete annealing process, is annealed after mould steel is made at 350 DEG C.
(6) process and heat treatment of mold
The damping tower die casting of novel body structural member die casting steel making, is processed, roughing according to drawing Afterwards using 1080 DEG C of quenchings, 580 DEG C of double tempering heat treatments, temper number HRC48.Finally finish outbound.
Using effect:
Using novel body structural member die casting steel making damping tower die casting, which strangles 2700 tons of die casting in cloth It is applied on machine, the mold has been used to 80,000 moulds at present, and there is abrasion on surface, but does not influence to continue to use.
Embodiment 2: inner plate of car door die casting
(1) chemical component
Novel body structural member die-casting die steel weight percent composition is as follows: C:0.320；Si:0.400；Mn:0.600； P:0.002；S:0.001；Cr:8.500；Mo:3.200；V:0.500；W:0.600；Nb:0.300；N:0.100；Ti:0.200.
(2) intermediate frequency (IF) smelting technique
Using 1000Kg medium-frequency induction furnace, basic lining, non-oxidizing process process for making.A small amount of bottom ash, high-power fusing； Change clear rear sampling in time；High temperature refinery, comprehensive deoxidation, first 5~10 minutes guarantee ingredients of tapping and temperature are suitable, and clinker is pure white； Take terminal sample within 10 minutes after alloying；Sulphur phosphorus content actual requirement P≤0.02, S≤0.008.Final deoxidizing is added in two portions with Al, 0.5 kilogram in tapping forehearth, add 0.5 kilogram when tapping one third in ladle.After steel scrap is melting down, various ferroalloy (Cr- are added Fe, Mo-Fe, Ni etc.), V-Fe is added before tapping, in 1600~1650 DEG C of slotting Al tappings, carries out compound change using method is poured in packet Matter is bred, purified treatment, wraps interior composite modifier composition are as follows: Y, Ce, Ti-Fe, Si-Ca, granularity are 5~10mm.
(3) electroslag remelting process
Guarantee that electrode welding is closely knit, guarantee concentric centering, removes joint flash and oxide；Graphite slugging, low level send slag to open Arc；Coordination electrode insertion depth properly increases molten speed；High-power temperature raising before exchange electrode, changes to electrode crawl power transmission, after triggering Slowly adjustment；The integrality for guaranteeing electrode, prevents chip off-falling；Guarantee that dummy ingot is smooth, checks crystallizer interior surface and both ends deformation Situation；Suitably match killing Ti or Al powder；Mid-term adjusts 5 kilograms of slag charge, above in three times to be added, and matches 20%Al2O3+ 80%CaF2；It is segmented feeding.
(4) forging technology
Using segmentally heating, heating speed is no more than 200 DEG C/h, and initial forging temperature is 1250 DEG C, final forging temperature 850 DEG C, it is pulled out using three upsettings three, forging ratio is greater than 6.
(5) homogenization and Grain Refinement
Using 1250 DEG C keep the temperature 24 hours, the cold progress high-temperature homogenization DIFFUSION TREATMENT of furnace, using 1130 DEG C it is air-cooled twice just Ultra fine-grained process is carried out well, using complete annealing process, is annealed after mould steel is made at 350 DEG C.
(6) process and heat treatment of mold
The inner plate of car door die casting of novel body structural member die casting steel making, is processed according to drawing, thick to add Using 1080 DEG C of quenchings, 600 DEG C of double tempering heat treatments, temper number HRC45 after work.Finally finish outbound.
Using effect:
Using novel body structural member die casting steel making inner plate of car door die casting, which strangles 2700 tons of pressures in cloth It is applied on casting machine, the mold has been used to 60,000 moulds at present, and there is abrasion on surface, but does not influence to continue to use.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and what is described in the above embodiment and the description is only the present invention Principle, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these variation and Improvement is both fallen in the range of claimed invention.The present invention claims protection scope by appended claims and its Equivalent defines.

Claims (8)

1. a kind of novel body structural member die-casting die steel, which is characterized in that include the following components'mass percentage: C:0.25 ~0.35%, Si:0.20~0.40%, Mn:0.20~0.60%, P≤0.002%, S≤0.001%, Cr:7~9%, Mo: 2.5~3.5%, V:0.30~0.50%, W:0.40~0.60%, Nb:0.10~0.30%, N:0.005~0.10%, Ti: 0.05~0.20%, surplus is Fe and inevitable impurity.
2. novel body structural member die-casting die steel according to claim 1, which is characterized in that including following quality percentage The component of ratio: C:0.28~0.32%, Si:0.20~0.40%, Mn:0.20~0.60%, P≤0.002%, S≤ 0.001%, Cr:7.50~8.50%, Mo:2.80~3.20%, V:0.30~0.50%, W:0.40~0.60%, Nb:0.10 ~0.30%, N:0.005~0.10%, Ti:0.05~0.20%, surplus are Fe and inevitable impurity.
3. a kind of mold making process of novel body structural member die-casting die steel as claimed in claim 1 or 2, feature exist In, comprising steps of
S100 intermediate frequency (IF) smelting, high temperature refinery, comprehensive deoxidation are added in two portions aluminium, after steel scrap is melting down, corresponding ferroalloy are added, out V-Fe is added before steel, in 1600~1650 DEG C of slotting aluminium tappings, carries out composite inoculating using method is poured in packet, breed, purified treatment；
S200 electroslag remelting process is segmented feeding；
S300 forging technology, using segmentally heating, heating speed is no more than 200 DEG C/h, and initial forging temperature is 1250 DEG C, finish-forging Temperature is 850 DEG C, is pulled out using three upsettings three, and forging ratio is greater than 6；
S400 homogenization and Grain Refinement keep the temperature 24 hours using 1250 DEG C, the cold progress high-temperature homogenization DIFFUSION TREATMENT of furnace, Using 1130 DEG C of air-cooled carry out ultra fine-grained process twice, using complete annealing process；
The process and heat treatment of S500 mold, die cast are quenched after roughing using 1080 DEG C, at 600 DEG C of double tempering heat Reason, finishing.
4. preparation process according to claim 3, which is characterized in that the specific steps of the step S200 include:
S210 guarantees that electrode welding is closely knit, guarantees concentric centering, removes joint flash and oxide；
S220 graphite slugging, low level send slag to open arc；
S230 coordination electrode insertion depth improves corresponding molten speed；
S240 exchanges high-power temperature raising before electrode, changes to electrode crawl power transmission, slowly adjusts after triggering；
S250 guarantees that dummy ingot is smooth, checks crystallizer interior surface and both ends deformation.
5. preparation process according to claim 4, which is characterized in that the step S200 further comprises step S260: With killing Ti powder or Al powder, mid-term adjusts slag charge, above in three times to be added, and matches the aluminium oxide and 80% for being 20% Calcirm-fluoride.
6. preparation process according to claim 5, which is characterized in that medium-frequency induction furnace is used in the step S100, Basic lining, non-oxidizing process process for making, first 5~10 minutes guarantee ingredients of tapping and temperature are suitable, take within 10 minutes after alloying Aluminium is added in two portions in terminal sample, 0.5kg in forehearth of tapping, and adds 0.5kg when tapping one third in ladle.
7. preparation process according to claim 6, which is characterized in that wrap in composite modifier composition are as follows: Y, Ce, Ti-Fe, Si-Ca, granularity are 5~10mm.
8. preparation process according to claim 7, which is characterized in that annealing temperature is 350 DEG C.
CN201910666292.5A 2019-07-23 2019-07-23 Novel body structural member die-casting die steel and its preparation process Withdrawn CN110241358A (en)

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CN112501520A (en) * 2020-12-03 2021-03-16 上海工程技术大学 Impact-resistant and smashing-resistant wear-resistant steel and preparation method thereof
CN114309534A (en) * 2021-12-29 2022-04-12 恒新增材制造研究中心(佛山)有限公司 Die-casting die and preparation method thereof

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CN101880829A (en) * 2010-07-09 2010-11-10 中国第一汽车集团公司 Novel magnesium alloy hot die steel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101880829A (en) * 2010-07-09 2010-11-10 中国第一汽车集团公司 Novel magnesium alloy hot die steel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112501520A (en) * 2020-12-03 2021-03-16 上海工程技术大学 Impact-resistant and smashing-resistant wear-resistant steel and preparation method thereof
CN114309534A (en) * 2021-12-29 2022-04-12 恒新增材制造研究中心(佛山)有限公司 Die-casting die and preparation method thereof

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