CN108624815A - Containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel and preparation method thereof - Google Patents
Containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel and preparation method thereof, belong to field of steel metallurgy.The technical problem to be solved is that pre-hardened plastic mold steel production cost is high and the quenching and tempering type plastic die steel production cycle is long, there is provided containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel, chemical composition is technical solution：By weight percentage, C 0.45%~0.52%, Si 0.30%~0.60%, Mn 1.20%~1.50%, P≤0.030%, S≤0.030%, Cr 0.20%~0.40%, V 0.10%~0.15%, Nb 0.010%~0.020%, Ti 0.010%~0.030%, Als 0.015%~0.050%, Mo≤0.03%, Ni≤0.30%, Cu≤0.25%, surplus Fe.
Description
Technical field
The present invention relates to containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel and preparation method thereof, belong to Ferrous Metallurgy neck
Domain.
Background technology
Plastic die steel be on active service when due to bear larger pressure, bending force, impact force and frictional force etc.,
To the more demanding of its comprehensive mechanical property, there are higher hardness, intensity and wearability and enough toughness.
Quenching and tempering type plastic die steel by quenching, reheating process, can make mould steel have hardness uniformly, processability
Can and the advantages that mechanical property is good, die deformation is small, however, it may appear that the defects of being heat-treated the deformation brought, cracking, decarburization,
But also it can extend manufacture cycle.In contrast, Micro Alloying pre-hardened plastic mold steel be not required to be quenched, temper, warp
It is air-cooled after forging or rolling to directly reach required quenching and tempering hardness, it not only avoids various caused by being heat-treated again after processing
Defect, improves the making precision of mold, while can also shorten fabrication cycle.
Current most popular pre-hardened plastic mold steel is mainly P20 (national standard trade mark 3Cr2Mo) and 718 (state's labels
Number 3Cr2NiMo) steel.P20 is the CrMo steel containing (1.40%~2.00%) Cr, (0.30%~0.52%) Mo, and 718 be in P20
On the basis of add (0.80%~1.20%) Ni high performance plastics mould steel.However, the above steel grade be both needed to addition content it is higher
The expensive alloying elements such as Mo, Cr just can guarantee that the mechanical property of mould steel, production cost are higher.
Invention content
The purpose of the present invention is to provide containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel and preparation method thereof, with solution
The problem of certainly existing pre-hardened plastic mold steel production cost height and quenching and tempering type plastic die steel production cycle length.
The present invention provides containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel, chemical composition is：By weight percentage
Meter, C：0.45%~0.52%, Si：0.30%~0.60%, Mn：1.20%~1.50%, P≤0.030%, S≤
0.030%, Cr：0.20%~0.40%, V：0.10%~0.15%, Nb：0.010%~0.020%, Ti：0.010%~
0.030%, Als：0.015%~0.050%, Mo≤0.03%, Ni≤0.30%, Cu≤0.25%, surplus Fe.
Further, the Micro Alloying pre-hardened plastic mold steel, chemical composition comprises the following components in percentage by weight, meet with
It is at least one of lower：P content is 0.012%~0.018%；S contents are 0.011%~0.012%；Als contents be 0.026%~
0.034%；Mo contents are 0.001%；Ni contents are 0.01%；Cu contents are 0.03%.
The present invention provides the preparation methods of the Micro Alloying pre-hardened plastic mold steel, include the following steps：Converter smelting
It refines, inert gas is blown into after Converter, LF stoves refine, RH application of vacuum, and steel billet is made in continuous casting, and heating steel billet, rolling are become a useful person, cold
But to get.
Further, the heating steel billet, rolling become a useful person step meet it is at least one of following：
Billet heating temperature is 950~1250 DEG C；
Preferably, billet heating temperature is 1194~1243 DEG C；
Soaking temperature is 1150~1200 DEG C；
Heating and soaking total time are 120~210min.
Wherein, soaking temperature need to be controlled at 1150 DEG C or more, just be can ensure that and rolled in austenite one phase area；In addition, casting
In base heating process, temperature is higher, then autstenitic grain size is about coarse, unfavorable to the structure property of finished product, and the present invention limits equal
The upper limit of hot temperature just can guarantee the structure property of finished product no more than 1200 DEG C.
Wherein, heating needed just to can ensure that strand center portion is consistent with surface temperature in 120~210min with soaking total time,
Otherwise temperature gradient is excessive, then is unfavorable for the structure property control of finished product.
Further, band steel is rolled into using band steel rolling line.
Further, the cooling step meets at least one of following：
The cold middle one or more of modes of natural air cooling, air-cooled, water cooling, mist are taken to be cooled down；
Cooling velocity is controlled in 1.00~1.50 DEG C/s；
It is collected when being cooled to 650 DEG C or less, later natural air cooling；
Preferably, it is collected when being cooled to 505~644 DEG C.
Further, the type of cooling is chosen according to the thickness of band steel.
Wherein, the tissue and property of plastic die steel needs could be obtained in 1.00~1.50 DEG C/s by cooling velocity being controlled
Can, otherwise tissue abnormalities and performance can be caused not to conform to.
Wherein, if be collected when temperature is higher than 650 DEG C, the cooling velocity of steel can be caused slack-off, to influence steel
Tissue and performance, cause mechanical property not conform to；Less than the temperature collection, then there is no problem, and cooling procedure hereafter does not influence steel
Tissue and performance.
Further, the converter smelting step meets at least one of following：
Molten iron and steel scrap are added in converter, enters stove S content≤0.060%；
After converter is added in molten iron and steel scrap, C is taken off by Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, when molten steel at
C is arrived in refining at the beginning of point：0.05%~0.20%, P≤0.025%, S≤0.025%, and tapping temperature be not less than 1650 DEG C when tapping arrive
In ladle；
Preferably, tapping temperature is 1650~1690 DEG C；
FeSi alloys, FeMn alloys, FeCr alloys, FeV alloys, FeNb alloys and carburant, control are added in tapping process
C processed is 0.40%~0.45%, Si be 0.35%~0.52%, Mn be 1.25%~1.45%, Cr is 0.25%~0.35%,
V is that 0.10%~0.15%, Nb is 0.010%~0.020%；
Preferably, the carburant is C powder or anthracite；
It is initially added into FeSi alloys, FeMn alloys, FeCr alloys, FeV alloys and FeNb alloys in tapping 1/3, is tapped
It is added before to 2/3.
Wherein, it controls into stove sulfur content≤0.060%, just can guarantee the requirement that finished product sulfur content reaches≤0.030%, it is no
It then needs to carry out desulfurization by LF stoves, not only increases cost, but also extend refining time, cannot ensure to smelt and continuous casting rhythm
Matching.
Wherein, the just control of steel-making water constituent：C：If oxygen activity of the control in ＜ 0.05% in steel is higher, and fluctuates
Larger, about in 50~1200ppm, follow-up refining is difficult to control, and deoxidation cost is higher；If C content ＞ 0.20%, due to
Liquid steel temperature in converter is so that strong heating element C, Si in molten steel etc. is generated heat by oxidation, to improve steel by oxygen blast
Coolant-temperature gage, if terminal C content is too high, the temperature of molten steel cannot meet tapping and require；P：It is oxidizing atmosphere, P in converter
Occur oxidation reaction with the oxygen that is blown into, oxidation product adsorbs to achieve the purpose that de- P by slag charge, and in follow-up LF refining and
It is reducing atmosphere during RH application of vacuum, in ladle, the P in vessel slag of the part containing high P that when tapping brings into is reduced
And be again introduced into steel, to cause finished product P to runaway (P≤0.030%), therefore, it is necessary to control the P of just steel-making water
Content is not more than 0.025%；S：If just S contents are more than 0.025% in steel-making water, finished product S contents are be easy to cause beyond control
Range (S≤0.030%), and S is easy to form sulphide inculsion in steel, it is totally unfavorable to the service life of mold.
Wherein, tapping temperature control is >=1650 DEG C, just can ensure that molten steel will not solidify before reaching LF stoves.If warm
Degree controls excessively high, then needs converter depth oxygen blast, is unfavorable for the control of cost and aim carbon, therefore preferably tapping temperature is 1650
~1690 DEG C.
Wherein, alloy is added in tapping process, the content range of each ingredient of control is committed step：It is sent out in production practices
Existing, if the upper limit value beyond above-mentioned restriction, finished product ingredient is easy to exceed the upper limit；If alloy is added very little when converter tapping,
Cause each component content to be less than the lower limiting value of above-mentioned restriction, whens RH stove trimmings, will need to be added a large amount of alloys, ingredient it is equal
It even property and pours steel temperature (the big molten steel temperature drop of alloy amount is also big) and is difficult to ensure, and usually all contain more impurity member in alloy
A large amount of alloys are added in element at this time, and subsequently without refining measure, the impurity element in alloy is difficult to remove, and is unfavorable for degree of purity
Control.
Wherein, FeSi alloys, FeMn alloys, FeCr alloys and FeV alloys, tapping to 2/3 are initially added into tapping 1/3
Before add, be conducive to alloy it is abundant fusing and be evenly distributed in molten steel.If it is too early that alloy is added, it is difficult to ensure alloy
Rapid melting；It is added too late, alloy rests on molten steel surface, is unfavorable for the fusing of alloy and is uniformly distributed.
Further, at least one of inert gas step satisfaction or less is blown into after the Converter：
The inert gas is argon gas or nitrogen；
It is blown into time >=2min of inert gas；
Preferably, it is blown into time >=4min of inert gas；
Aluminum steel is fed when being blown into inert gas, pre-deoxidation is carried out to molten steel；
Preferably, aluminum steel is fed according to molten steel oxygen activity, molten steel oxygen activity is reduced by the pure Al of ton steel feeding 0.0015kg
1ppm is controlled, by the control of molten steel oxygen activity within 30ppm.
Wherein, the blowing time of inert gas is not less than 2min, can ensure that molten steel has enough circulation time, can be with
Make all kinds of alloys of addition fully melt and uniformly.
Further, the LF stoves refinement step meets at least one of following：
The refining of LF stoves uses electrical heating；
Liquid steel temperature is 1556~1596 DEG C.
Wherein, control liquid steel temperature be 1556~1596 DEG C, it can be ensured that when pouring steel molten steel overheat 20~50 DEG C it
Between, being smoothed out for steel is poured in guarantee.
Further, the RH application of vacuum step meets at least one of following：
Vacuum processing time >=12min；
Preferably, vacuum processing time is 13~16min；
The processing time of vacuum degree≤3mbar >=10min；
Preferably, the processing time of vacuum degree≤3mbar is 10~13min；
After vacuum degree≤3mbar processing, trimming is carried out, and FeTi alloys are added, control the C in steel：0.45%~
0.52%, Si：0.30%~0.60%, Mn：1.20%~1.50%, Cr：0.20%~0.40%, V：0.10%~
0.15%, Nb：0.010%~0.020%, Ti：0.010%~0.030%, Als：0.015%~0.050%.
Wherein, when vacuum degree reaches 3mbar or less, could effectively deviate from molten steel [H]；Ensure vacuum degree≤3mbar's
Processing time >=10min could control [H] in molten steel within 2.0ppm.
Further, the continuous casting step meets at least one of following：
Tundish temperature is 1496~1536 DEG C；
Preferably, tundish temperature is 1515~1516 DEG C；
Slab cooling is to room temperature.
The liquidus temperature of steel grade of the present invention is about 1476~1486 DEG C, and control tundish temperature is higher than the liquidus temperature of steel
20 DEG C or more, it can be ensured that molten steel will not solidify in ladle, it is ensured that pour steel and be smoothed out；When the degree of superheat is more than 50 DEG C, casting
Base center porosity and centre burst are more serious, and center porosity possibly even reaches 3.0 grades or more, and generate a large amount of middle heart shake
The defects of line and shrinkage cavity, therefore, the upper limit for controlling the degree of superheat is 50 DEG C, can ensure slab quality.
The present invention provides the Micro Alloying pre-hardened plastic mold steels containing V, Nb, Ti, mainly have the following advantages：
1, using V, Nb, Ti microalloying mode, under the premise of ensureing mechanical property needed for mould steel, compared to existing
Pre-hardened plastic mold steel the usage amount of precious metal element Mo, Cr can be greatly decreased, significantly reduce production cost.
2, it is not necessarily to modifier treatment, it is main to optimize soaking temperature, total heating time and cooling velocity after rolling etc. in the operation of rolling
Parameter can reach pre-hardening effect by online controlled rolling and controlled cooling, and operating method is simple, with short production cycle, and avoids
The problems such as being processed into the heat-treatment distortion after mold.
3, the plastic die steel hardness that the present invention is prepared can control into 28~36HRC, disclosure satisfy that market
Requirement to pre-hardened plastic mold steel is suitble to promote and apply in the industrial production.
Specific implementation mode
The raw material that is used in the specific embodiment of the invention, equipment are known product, pass through and buy commercial product and obtain.
The present invention provides the Micro Alloying pre-hardened plastic mold steel containing V, Nb, Ti, chemical composition is：Percentage by weight
Than meter, C：0.45%~0.52%, Si：0.30%~0.60%, Mn：1.20%~1.50%, P≤0.030%, S≤
0.030%, Cr：0.20%~0.40%, V：0.10%~0.15%, Nb：0.010%~0.020%, Ti：0.010%~
0.030%, Als：0.015%~0.050%, Mo≤0.03%, Ni≤0.30%, Cu≤0.25%, surplus Fe.
Plastic die steel of the present invention is by adding alloying component V：0.10%~0.15%, Nb：0.010%~0.020%
And Ti：0.010%~0.030%, the usage amount of precious metal element Mo, Cr is greatly reduced, and hardness can be prepared
For the plastic die steel of 28~36HRC.Wherein, V is added：0.10%~0.15%, Nb：0.010%~0.020% and Ti：
0.010%~0.030%, primarily to giving full play to its precipitation strength and Grain refinement, steel can be made to keep fine grain
Grain tissue, to ensure that steel has the matching of good obdurability and high hardness, to improve the service life of mold.
In addition, the chemical composition of plastic die steel of the present invention also contains Cr：0.20%~0.40%, Cr are to effectively improve steel
Quenching degree, tensile strength and hardness one of element, therefore, be added 0.20%~0.40% Cr primarily to improve steel
In the comprehensive performance after line Pre-hardening treatment.
Further, the present invention optimizes the parameters such as soaking temperature, total heating time and cooling velocity after rolling in the operation of rolling,
Pre-hardening effect is can reach by online controlled rolling and controlled cooling, without carrying out modifier treatment.
The preparation of 1 Micro Alloying pre-hardened plastic mold steel of the present invention of embodiment
The technology of the present invention is used on 120 tons of (practical tap is within the scope of 120~140 tons) bof processes of nominal capacity
Produce the Micro Alloying pre-hardened plastic mold steel containing V, Nb, Ti, production technology is is blown into inert gas → LF after converter smelting → stove
The machine 4 of stove refining → RH application of vacuum → 4, which flows billet caster and is cast into 360mm × 450mm steel billets → heating steel billet → band steel, to be rolled
Production line processed is rolled into 10~100mm (thickness) × 400~500mm (width) → and rolls rear online Pre-hardening treatment.
123 tons of molten iron and 20 tons of steel scraps are added first in converter, it is 0.035% to enter stove S contents, and molten iron and steel scrap are added
After converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, when molten steel composition is just refined to 0.06%
C, 0.014% P, 0.012% S, tapping is in ladle when temperature is 1669 DEG C, and practical tap is 133 tons of (converters at this time
About 5% raw material is burnt in smelting process).Tap 1/3 when be initially added into FeSi alloys, FeMn alloys, FeCr alloys, FeV
Alloy and FeNb alloys add before tapping to 2/3, wherein Si contents are Mn in 74%, FeMn alloys in the FeSi alloys being added
Content is that Cr contents are that Nb contents are that V content is in 65%, FeV alloys in 54%, FeNb alloys in 82%, FeCr alloys
78%, it is 92% that C is fixed in anthracite, controls in molten steel that C content is 0.42%, Si contents are that 0.45%, Mn contents are
1.33%, Cr content is 0.28%, V content 0.10%, and Nb contents are 0.011%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into argon gas, is blown into argon
200m aluminum steels are fed using the method for line feeding after gas 4min, by the control of molten steel oxygen activity within 30ppm.
After molten steel reaches LF stoves, connects argon gas pipeline and be blown into argon gas, and be electrically heated, liquid steel temperature reaches 1572 DEG C
When, molten steel is sent to RH processes and is vacuum-treated.
After molten steel reaches RH processes, it is vacuum-treated, vacuum processing time 14min, at wherein vacuum degree≤3mbar
When managing 11min, trimming is carried out, and FeTi alloys are added, Ti contents are 40% in FeTi alloys, control Ti contents in molten steel
It is 0.013%, then molten steel is sent to conticaster and is cast.
It being cast into 360mm × 450mm strands on 4 machines 4 stream billet caster, tundish temperature is 1516 DEG C when continuous casting,
The liquidus temperature of steel is 1482 DEG C, packet sampling analysis molten steel chemical constituent is 0.45% in conticaster C, 0.32%
Si, 1.23% Mn, 0.018% P, 0.012% S, 0.22% Cr, 0.10% V%, Nb content be 0.011%,
0.012% Ti, 0.026% Als, 0.001% Mo, 0.01% Ni, 0.03% Cu, surplus is Fe and inevitable
Impurity.Casting blank stacking cooled to room temperature.
It is sent after slab cooling to band steel rolling line and is heated, rolled, rolling specs are 10mm (thickness) × 410mm
The band steel of (width).Billet heating temperature control is 1243 DEG C, and soaking temperature control is 1194 DEG C, heating and soaking total time
206min；Rear natural air cooling is rolled, cooling velocity is 1.0 DEG C/s, is collected when being cooled to 644 DEG C, later stacking natural air cooling.
The Hardness Surveillance result of steel is 29HRC；Mechanical properties test result：Rel is 624.5Mpa, Rm 887.8Mpa, A
For 44.1%, Aku (room temperature) 36.2J；The tissue of steel is ferrite+pearlite；The decarburized layer deepness measurement result of steel is
0.42mm；The non-metallic inclusion rating result of steel be A classes be carefully 1.0 grades, A classes are slightly 0 grade, B classes are carefully 0.5 grade, B classes are slightly
0 grade, C classes be carefully 0 grade, C classes are slightly 0 grade, D classes are carefully 0 grade, D classes are slightly 0 grade, Ds classes are 0 grade.
The preparation of 2 Micro Alloying pre-hardened plastic mold steel of the present invention of embodiment
The technology of the present invention is used on 120 tons of (practical tap is within the scope of 120~140 tons) bof processes of nominal capacity
Produce the Micro Alloying pre-hardened plastic mold steel containing V, Nb, Ti, production technology is is blown into inert gas → LF after converter smelting → stove
The machine 4 of stove refining → RH application of vacuum → 4, which flows billet caster and is cast into 360mm × 450mm steel billets → heating steel billet → band steel, to be rolled
Production line processed is rolled into 10~100mm (thickness) × 400~500mm (width) → and rolls rear online Pre-hardening treatment.
123 tons of molten iron and 20 tons of steel scraps are added first in converter, it is 0.052% to enter stove S contents, and molten iron and steel scrap are added
After converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, when molten steel composition is just refined to 0.15%
C, 0.014% P, 0.010% S, tapping is in ladle when temperature is 1667 DEG C, and practical tap is 136 tons of (converters at this time
About 5% raw material is burnt in smelting process).Tap 1/3 when be initially added into FeSi alloys, FeMn alloys, FeCr alloys, FeV
Alloy and FeNb alloys add before tapping to 2/3, wherein Si contents are Mn in 74%, FeMn alloys in the FeSi alloys being added
Content is that Cr contents are that Nb contents are that V content is in 65%, FeV alloys in 54%, FeNb alloys in 82%, FeCr alloys
78%, it is 92% that C is fixed in anthracite, controls in molten steel that C content is 0.44%, Si contents are that 0.41%, Mn contents are
1.38%, Cr content are 0.26%, V content 0.15%, Nb contents are 0.019%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into argon gas, is blown into argon
200m aluminum steels are fed using the method for line feeding after gas 4min, by the control of molten steel oxygen activity within 30ppm.
After molten steel reaches LF stoves, connects argon gas pipeline and be blown into argon gas, and be electrically heated, liquid steel temperature reaches 1572 DEG C
When, molten steel is sent to RH processes and is vacuum-treated.
After molten steel reaches RH processes, it is vacuum-treated, vacuum processing time 16min, at wherein vacuum degree≤3mbar
When managing 13min, trimming is carried out, and FeTi alloys are added, Ti contents are 40% in FeTi alloys, control Ti contents in molten steel
It is 0.029%, then molten steel is sent to conticaster and is cast.
It being cast into 360mm × 450mm strands on 4 machines 4 stream billet caster, tundish temperature is 1515 DEG C when continuous casting,
The liquidus temperature of steel is 1482 DEG C, packet sampling analysis molten steel chemical constituent is 0.51% in conticaster C, 0.57%
Si, 1.48% Mn, 0.017% P, 0.011% S, 0.38% Cr, 0.15% V%, 0.018% Nb,
0.027% Ti, 0.032% Als, 0.001% Mo, 0.01% Ni, 0.03% Cu, surplus is Fe and inevitable
Impurity.Casting blank stacking cooled to room temperature.
It is sent after slab cooling to band steel rolling line and is heated, rolled, rolling specs are 100mm (thickness) × 500mm
The band steel of (width).Billet heating temperature control is 1194 DEG C, and soaking temperature control is 1156 DEG C, heating and soaking total time
121min；Online Pre-hardening treatment is carried out by wearing water+misting cooling mode after rolling, the surface cooling velocity of steel is 1.4 DEG C/s,
It is collected when being cooled to 505 DEG C, later stacking natural air cooling.
The Hardness Surveillance result of steel is 36HRC；Mechanical properties test result：Rel is 697.9Mpa, Rm 993.6Mpa, A
For 38.7%, Aku (room temperature) 24.1J；The tissue of steel is ferrite+pearlite；The decarburized layer deepness measurement result of steel is
0.32mm；The non-metallic inclusion rating result of steel be A classes be carefully 0.5 grade, A classes are slightly 0.5 grade, B classes are carefully 0.5 grade, B classes are thick
It it is 0 grade, C classes are carefully 0 grade, C classes are slightly 0 grade, D classes are carefully 0 grade, D classes are slightly 0 grade, Ds classes are 0 grade.
The preparation of 3 Micro Alloying pre-hardened plastic mold steel of the present invention of embodiment
The technology of the present invention is used on 120 tons of (practical tap is within the scope of 120~140 tons) bof processes of nominal capacity
Produce the Micro Alloying pre-hardened plastic mold steel containing V, Nb, Ti, production technology is is blown into inert gas → LF after converter smelting → stove
The machine 4 of stove refining → RH application of vacuum → 4, which flows billet caster and is cast into 360mm × 450mm steel billets → heating steel billet → band steel, to be rolled
Production line processed is rolled into 10~100mm (thickness) × 400~500mm (width) → and rolls rear online Pre-hardening treatment.
124 tons of molten iron and 20 tons of steel scraps are added first in converter, it is 0.042% to enter stove S contents, and molten iron and steel scrap are added
After converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, when molten steel composition is just refined to 0.16%
C, 0.011% P, 0.011% S, tapping is in ladle when temperature is 1667 DEG C, and practical tap is 132 tons of (converters at this time
About 5% raw material is burnt in smelting process).Tap 1/3 when be initially added into FeSi alloys, FeMn alloys, FeCr alloys, FeV
Alloy and FeNb alloys add before tapping to 2/3, wherein Si contents are Mn in 74%, FeMn alloys in the FeSi alloys being added
Content is that Cr contents are that Nb contents are that V content is in 65%, FeV alloys in 54%, FeNb alloys in 82%, FeCr alloys
78%, it is 92% that C is fixed in anthracite, controls in molten steel that C content is 0.44%, Si contents are that 0.48%, Mn contents are
1.35%, Cr content are 0.29%, V content 0.13%, Nb contents are 0.016%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into argon gas, is blown into argon
200m aluminum steels are fed using the method for line feeding after gas 4min, by the control of molten steel oxygen activity within 30ppm.
After molten steel reaches LF stoves, connects argon gas pipeline and be blown into argon gas, and be electrically heated, liquid steel temperature reaches 1577 DEG C
When, molten steel is sent to RH processes and is vacuum-treated.
After molten steel reaches RH processes, it is vacuum-treated, vacuum processing time 13min, at wherein vacuum degree≤3mbar
When managing 10min, trimming is carried out, and FeTi alloys are added, Ti contents are 40% in FeTi alloys, control Ti contents in molten steel
It is 0.022%, then molten steel is sent to conticaster and is cast.
It being cast into 360mm × 450mm strands on 4 machines 4 stream billet caster, tundish temperature is 1516 DEG C when continuous casting,
The liquidus temperature of steel is 1482 DEG C, packet sampling analysis molten steel chemical constituent is 0.49% in conticaster C, 0.48%
Si, 1.34% Mn, 0.012% P, 0.011% S, 0.30% Cr, 0.13% V%, 0.014% Nb,
0.022% Ti, 0.034% Als, 0.001% Mo, 0.01% Ni, 0.03% Cu, surplus is Fe and inevitable
Impurity.Casting blank stacking cooled to room temperature.
It is sent after slab cooling to band steel rolling line and is heated, rolled, rolling specs are 60mm (thickness) × 455mm
The band steel of (width).Billet heating temperature control is 1214 DEG C, and soaking temperature control is 1189 DEG C, heating and soaking total time
175min；Online Pre-hardening treatment is carried out by spraying+air cooling way after rolling, the surface cooling velocity of steel is 1.2 DEG C/s, is cooled to
It is collected at 594 DEG C, later stacking natural air cooling.
The Hardness Surveillance result of steel is 30HRC；Mechanical properties test result：Rel is 656.4pa, Rm 928.6Mpa, A
For 38.9%, Aku (room temperature) 27.8J；The tissue of steel is ferrite+pearlite；The decarburized layer deepness measurement result of steel is
0.33mm；The non-metallic inclusion rating result of steel be A classes be carefully 0.5 grade, A classes are slightly 0.5 grade, B classes are carefully 0.5 grade, B classes are thick
It it is 0 grade, C classes are carefully 0 grade, C classes are slightly 0 grade, D classes are carefully 0 grade, D classes are slightly 0 grade, Ds classes are 0 grade.
Claims (10)
1. the Micro Alloying pre-hardened plastic mold steel containing V, Nb, Ti, it is characterized in that：Its chemical composition is：By weight percentage, C：
0.45%~0.52%, Si：0.30%~0.60%, Mn：1.20%~1.50%, P≤0.030%, S≤0.030%, Cr：
0.20%~0.40%, V：0.10%~0.15%, Nb：0.010%~0.020%, Ti：0.010%~0.030%, Als：
0.015%~0.050%, Mo≤0.03%, Ni≤0.30%, Cu≤0.25%, surplus Fe.
2. Micro Alloying pre-hardened plastic mold steel as described in claim 1, it is characterized in that：Its chemical composition is by weight percentage
Meter meets at least one of following：P content is 0.012%~0.018%；S contents are 0.011%~0.012%；Als contents are
0.026%~0.034%；Mo contents are 0.001%；Ni contents are 0.01%；Cu contents are 0.03%.
3. the preparation method of Micro Alloying pre-hardened plastic mold steel described in claims 1 or 2, it is characterized in that：Include the following steps：
Converter smelting, inert gas, the refining of LF stoves are blown into after Converter, and steel billet, heating steel billet, rolling is made in RH application of vacuum, continuous casting
Become a useful person, it is cooling to get.
4. preparation method as claimed in claim 3, it is characterized in that：The heating steel billet, rolling become a useful person step meet with down toward
One item missing：
Billet heating temperature is 950~1250 DEG C；
Preferably, billet heating temperature is 1194~1243 DEG C；
Soaking temperature is 1150~1200 DEG C；
Heating and soaking total time are 120~210min.
5. preparation method as claimed in claim 3, it is characterized in that：The cooling step meets at least one of following：
The cold middle one or more of modes of natural air cooling, air-cooled, water cooling, mist are taken to be cooled down；
Cooling velocity is controlled in 1.00~1.50 DEG C/s；
It is collected when being cooled to 650 DEG C or less, later natural air cooling；
Preferably, it is collected when being cooled to 505~644 DEG C.
6. preparation method as claimed in claim 3, it is characterized in that：The converter smelting step meets at least one of following：
Molten iron and steel scrap are added in converter, enters stove S content≤0.060%；
After converter is added in molten iron and steel scrap, C is taken off by Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, at the beginning of molten steel composition
Refine C：0.05%~0.20%, P≤0.025%, S≤0.025%, and when tapping temperature is not less than 1650 DEG C tapping to ladle
In；
Preferably, tapping temperature is 1650~1690 DEG C；
FeSi alloys, FeMn alloys, FeCr alloys, FeV alloys, FeNb alloys and carburant are added in tapping process, control C is
0.40%~0.45%, it be 1.25%~1.45%, Cr is that 0.25%~0.35%, V is that Si, which is 0.35%~0.52%, Mn,
0.10%~0.15%, Nb are 0.010%~0.020%；
Preferably, the carburant is C powder or anthracite；
FeSi alloys, FeMn alloys, FeCr alloys, FeV alloys and FeNb alloys, tapping to 2/3 are initially added into tapping 1/3
Before add.
7. preparation method as claimed in claim 3, it is characterized in that：It is following that inert gas step satisfaction is blown into after the Converter
At least one of：
The inert gas is argon gas or nitrogen；
It is blown into time >=2min of inert gas；
Preferably, it is blown into time >=4min of inert gas；
Aluminum steel is fed when being blown into inert gas, pre-deoxidation is carried out to molten steel；
Preferably, aluminum steel is fed according to molten steel oxygen activity, by ton steel feeding 0.0015kg pure Al reduction molten steel oxygen activity 1ppm into
Row control, by the control of molten steel oxygen activity within 30ppm.
8. preparation method as claimed in claim 3, it is characterized in that：The LF stoves refinement step meets at least one of following：
The refining of LF stoves uses electrical heating；
Liquid steel temperature is 1556~1596 DEG C.
9. preparation method as claimed in claim 3, it is characterized in that：The RH application of vacuum step meets at least one of following：
Vacuum processing time >=12min；
Preferably, vacuum processing time is 13~16min；
The processing time of vacuum degree≤3mbar >=10min；
Preferably, the processing time of vacuum degree≤3mbar is 10~13min；
After vacuum degree≤3mbar processing, trimming is carried out, and FeTi alloys are added, control the C in steel：0.45%~
0.52%, Si：0.30%~0.60%, Mn：1.20%~1.50%, Cr：0.20%~0.40%, V：0.10%~
0.15%, Nb：0.010%~0.020%, Ti：0.010%~0.030%, Als：0.015%~0.050%.
10. preparation method as claimed in claim 3, it is characterized in that：The continuous casting step meets at least one of following：
Tundish temperature is 1496~1536 DEG C；
Preferably, tundish temperature is 1515~1516 DEG C；
Slab cooling is to room temperature.
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Application publication date: 20181009 |