CN103710490B - 3Cr2MnMoS die steel refining denaturing agent Adding Way - Google Patents
3Cr2MnMoS die steel refining denaturing agent Adding Way Download PDFInfo
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- CN103710490B CN103710490B CN201310695686.6A CN201310695686A CN103710490B CN 103710490 B CN103710490 B CN 103710490B CN 201310695686 A CN201310695686 A CN 201310695686A CN 103710490 B CN103710490 B CN 103710490B
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- denaturing agent
- 3cr2mnmos
- sulphur
- molten steel
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- 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
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Abstract
For the denaturing agent recovery rate solving the existence of prior art 3Cr2MnMoS die steel refining denaturing agent Adding Way is lower, make the problems such as its degenerative effects Oxygen potential that is unstable and steel intrinsic silicon inclusion is lower, the present invention proposes a kind of 3Cr2MnMoS die steel refining denaturing agent Adding Way and adopts electric arc furnace EF+ ladle refining LF to produce 3Cr2MnMoS die steel, it is characterized in that: in LF deoxidation with after adjusting other compositions, firebrick block is adopted to make acid slag, sulphur heart yearn is adopted to increase sulphur, after the slag removing weight percent 80%, VD type ladle refining furnace is adopted to process molten steel, and in casting cycle, add denaturing agent spheroidizing is carried out to the sulfide in molten steel.The Advantageous Effects of 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention is the recovery rate that significantly can improve denaturing agent, and ensure that most sulfide inclusion is by nodularization, the die steel carrying out flaw detection qualification rate produced is greater than 95%.
Description
Technical field
The present invention relates to a kind of senior die steel refining techniques, be related specifically to a kind of 3Cr2MnMoS die steel refining denaturing agent Adding Way.
Background technology
The die steel (usually also referred to as German Bu Delusi 3Cr2MnMoS die steel) of 3Cr2MnMoS die steel system German standard, because it has hardness, intensity and the surface smoothness be comparatively applicable to, be usually used on the large-sized plastic rubber mould of requirement high surface finish, mould bases, as: bumper, TV shell die etc.
Usually, adopt the explained hereafter 3Cr2MnMoS die steel of electric arc furnace EF+ ladle refining LF or VD type ladle refining furnace, adopt oxidation style when EF smelts, remove impurity; Deoxidation and other compositions of adjustment when LF or VD type ladle refining.According to standard, the sulphur content of 3Cr2MnMoS die steel is 0.05 to 0.10(weight percent), its steel intrinsic silicon sulfide to be mingled with content also higher, be mingled with at hot procedure medium sulphide content and easily produce internal fissure, make hot-work part usually exceed standard because of internal fissure during carrying out flaw detection and scrap.For this reason, take to add denaturing agent carries out denaturing treatment mode to inclusion, carry out spheroidizing by inclusion, reduce the impact of inclusion on steel intrinsic silicon crackle with this.So-called denaturing agent is generally rare earth element, as Ce, Y etc., the inclusion of separating out with strip MnS form can be made to change over separate out with the form of the rare-earth sulfides such as spherical CeS after adding denaturing agent.And spherical rare-earth sulfide is compared with strip MnS, there is in hot procedure better hot-workability, not easily produce internal fissure and flaw detection qualification rate is significantly improved.Usually, the add-on of rare earth element is 1 ~ 1.3 times of S content.Prior art 3Cr2MnMoS die steel refining denaturing agent Adding Way adds denaturing agent in VD type ladle refining process, because the temperature of molten steel in refining process is higher and oxygen level is higher, and rare earth is very easily oxidized, make the oxidized formation rare earth oxide of part rare earth element, the rare earth element amount forming spherical rare-earth sulfide is reduced, makes its degenerative effects unstable, unreliable.Usually, the formation denaturing agent quantity of spherical sulfide and the ratio of its add-on are referred to as denaturing agent recovery rate, and weigh the service efficiency of denaturing agent with this.Obviously, the recovery rate that prior art 3Cr2MnMoS die steel refining denaturing agent Adding Way also exists denaturing agent is lower, makes the problems such as its degenerative effects Oxygen potential that is unstable and steel intrinsic silicon inclusion is lower.
Summary of the invention
For the denaturing agent recovery rate solving the existence of prior art 3Cr2MnMoS die steel refining denaturing agent Adding Way is lower, make the problems such as its degenerative effects Oxygen potential that is unstable and steel intrinsic silicon inclusion is lower, the present invention proposes a kind of 3Cr2MnMoS die steel refining denaturing agent Adding Way.3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention adopts electric arc furnace EF+ ladle refining LF to produce 3Cr2MnMoS die steel, it is characterized in that: in LF deoxidation with after adjusting other compositions, firebrick block is adopted to make acid slag, sulphur heart yearn is adopted to increase sulphur, after the slag removing weight percent 80%, adopt VD type ladle refining furnace to process molten steel, and in casting cycle, add denaturing agent spheroidizing is carried out to the sulfide in molten steel;
Described employing firebrick block is made acid slag and is included in after the deoxidation of LF stove and composition adjusted, and add the slag making of firebrick block and make basicity of slag be 1.1 ~ 1.4, the composition of described firebrick block is the SiO of weight ratio 60%
2with 40% Al
2o
3;
After described employing sulphur heart yearn increasing sulphur comprises slag melting getting well, with feeding wire machine feeding sulphur heart yearn, adjustment S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
Described employing VD type ladle refining furnace carries out process to molten steel and comprises and ladle is hung in VD stove, evacuated time >=20 minute, makes its vacuum tightness≤67Pa;
The described denaturing agent that adds in casting cycle carries out hanging rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires in mould when spheroidizing is included in cast to the sulfide in molten steel, and add-on is 0.3 ~ 0.5kg/ ton molten steel.
Further, 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention, comprises the following steps:
S1, employing electric arc furnace EF melting 3Cr2MnMoS mould molten steel;
S2, employing ladle refining LF carry out refining to 3Cr2MnMoS mould molten steel, and comprise, deoxidation also adjusts alloy ingredient;
S3, employing firebrick block make acid slag, and comprise, add the slag making of firebrick block and make basicity of slag be 1.1 ~ 1.4, the composition of described firebrick block is the SiO of weight ratio 60%
2with 40% Al
2o
3;
S4, adopt sulphur heart yearn to increase sulphur, comprise, slag melting good after, with feeding wire machine feeding sulphur heart yearn, adjustment S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
S5, employing VD type ladle refining furnace process molten steel, comprise, ladle are hung in VD stove, evacuated time >=20 minute, make its vacuum tightness≤67Pa;
S6, add denaturing agent carry out spheroidizing to the sulfide in molten steel in casting cycle, comprise, hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires when pouring into a mould in mould, add-on is 0.3 ~ 0.5kg/ ton molten steel.
The Advantageous Effects of 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention is the recovery rate that significantly can improve denaturing agent, and ensure that most sulfide inclusion is by nodularization, the die steel carrying out flaw detection qualification rate produced is greater than 95%.
Accompanying drawing explanation
Accompanying drawing 1 is the step schematic diagram of 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention.
Below in conjunction with the drawings and specific embodiments, 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention is further described.
Embodiment
Accompanying drawing 1 is the step schematic diagram of 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention, as seen from the figure, 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention adopts electric arc furnace EF+ ladle refining LF to produce 3Cr2MnMoS die steel, it is characterized in that: in LF deoxidation with after adjusting other compositions, firebrick block is adopted to make acid slag, sulphur heart yearn is adopted to increase sulphur, after the slag removing weight percent 80%, adopt VD type ladle refining furnace to process molten steel, and in casting cycle, add denaturing agent spheroidizing is carried out to the sulfide in molten steel;
Described employing firebrick block is made acid slag and is included in after the deoxidation of LF stove and composition adjusted, and add the slag making of firebrick block and make basicity of slag be 1.1 ~ 1.4, the composition of described firebrick block is the SiO of weight ratio 60%
2with 40% Al
2o
3;
After described employing sulphur heart yearn increasing sulphur comprises slag melting getting well, with feeding wire machine feeding sulphur heart yearn, adjustment S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
Described employing VD type ladle refining furnace carries out process to molten steel and comprises and ladle is hung in VD stove, evacuated time >=20 minute, makes its vacuum tightness≤67Pa;
The described denaturing agent that adds in casting cycle carries out hanging rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires in mould when spheroidizing is included in cast to the sulfide in molten steel, and add-on is 0.3 ~ 0.5kg/ ton molten steel.
3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention, comprises the following steps:
S1, employing electric arc furnace EF melting 3Cr2MnMoS mould molten steel;
S2, employing ladle refining LF carry out refining to 3Cr2MnMoS mould molten steel, and comprise, deoxidation also adjusts alloy ingredient;
S3, employing firebrick block make acid slag, and comprise, add the slag making of firebrick block and make basicity of slag be 1.1 ~ 1.4, the composition of described firebrick block is the SiO of weight ratio 60%
2with 40% Al
2o
3;
S4, adopt sulphur heart yearn to increase sulphur, comprise, slag melting good after, with feeding wire machine feeding sulphur heart yearn, adjustment S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
S5, employing VD type ladle refining furnace process molten steel, comprise, ladle are hung in VD stove, evacuated time >=20 minute, make its vacuum tightness≤67Pa;
S6, add denaturing agent carry out spheroidizing to the sulfide in molten steel in casting cycle, comprise, hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires when pouring into a mould in mould, add-on is 0.3 ~ 0.5kg/ ton molten steel.
Embodiment 1
Heat (batch) number 13V122, steel grade 3Cr2MnMoS, ingot shape 10.6T, number 2;
Electric arc furnace EF melting, oxygen blast is fluxed, oxygen pressure 0.4Mpa; Dark oxygen blast, oxygen pressure 1.0Mpa; Sampling, skims 90%, temperature 1635 DEG C tapping, molten steel component weight percent C0.06, Si0.01, Mn0.06, P0.006, S0.1, Cr0.25, Mo0.15;
Ladle refining LF, adds lime 300kg, high carbon ferro-chrome 650kg, high carbon ferromanganese 450kg, molybdenum-iron 30kg, and melting is after 30 minutes, and feeding aluminum steel 80m, adds silicon calcium powder 30kg, carbon dust 30kg, sampling, molten steel component weight percent C0.31, Si0.15, Mn1.25.P0.013,S0.045,Cr1.65,Mo0.21;
Make acid slag, add firebrick block 400kg, basicity of slag is 1.1 ~ 1.4, and the composition of described firebrick block is the SiO of weight ratio 60%
2with 40% Al
2o
3;
Sulphur heart yearn increases sulphur, adjustment molten steel temperature about 1630 DEG C, feeding sulphur heart yearn 120m, and the S content of described sulphur heart yearn is weight ratio 60%, sampling, molten steel component weight percent C0.34, Si0.17, Mn, 1.28, P0.015, S0.104, Cr1.69, Mo0.21;
VD type ladle refining, adjustment molten steel temperature about 1650 DEG C, vapor pressure 1Mpa starts to find time; Vacuum tightness 67Pa keeps 15 minutes, and vacuum tightness 39Pa is broken empty, and adjustment temperature about 157 DEG C, hangs out and water steel;
Casting: adopt 10.6T ingot mould, hang in rare-earth wires 4.5kg respectively in 2 ingot moulds, described rare-earth wires is Ce rare-earth wires, its Ce content >=99% weight percent.
Embodiment 2
Heat (batch) number 13V140, steel grade 3Cr2MnMoS, ingot shape 13T, number 2; The making step of embodiment 2 is identical with embodiment 1, and supplementary material add-on, condition control also identical with embodiment 1 with Composition Control, and difference is only that the add-on of rare-earth wires is slightly different.Due to the ingot shape 13T of embodiment 2, therefore, the add-on of rare-earth wires is for often to prop up ingot shape 5.5kg.
Embodiment 3
Heat (batch) number 13V196, steel grade 3Cr2MnMoS, ingot shape 13T, number 2; Embodiment 3 is actually the replica test of embodiment 2, and its making step, supplementary material add-on, condition control all identical with embodiment 2 with Composition Control.
The steel ingot that embodiment 1 ~ 3 is poured into a mould, after hot-work, carrying out carrying out flaw detection to it, it is qualified that all steel ingots are.The composition assay of embodiment 1 ~ 3 and flaw detection the results are shown in following table.
As can be seen from the above table, invention 3Cr2MnMoS die steel refining denaturing agent Adding Way, rare earth is added in casting cycle, because the oxygen level in the molten steel of molten steel after VD type ladle refining is lower, in addition, after casting, molten steel will solidify very soon, and the possibility making rare earth element oxidized reduces greatly, and its overwhelming majority defines spherical rare-earth sulfide.
Obviously, the Advantageous Effects of 3Cr2MnMoS die steel refining denaturing agent Adding Way of the present invention is the recovery rate that significantly can improve denaturing agent, and ensure that most sulfide inclusion is by nodularization, the die steel carrying out flaw detection qualification rate produced is greater than 95%.
Claims (2)
1. a 3Cr2MnMoS die steel refining denaturing agent Adding Way, electric arc furnace EF+ ladle refining LF is adopted to produce 3Cr2MnMoS die steel, it is characterized in that: in LF deoxidation with after adjusting other compositions, firebrick block is adopted to make acid slag, sulphur heart yearn is adopted to increase sulphur, after the slag removing weight percent 80%, adopt VD type ladle refining furnace to process molten steel, and in casting cycle, add denaturing agent spheroidizing is carried out to the sulfide in molten steel;
Described employing firebrick block is made acid slag and is included in after the deoxidation of LF stove and composition adjusted, and add the slag making of firebrick block and make basicity of slag be 1.1 ~ 1.4, the composition of described firebrick block is the SiO of weight ratio 60%
2with 40% Al
2o
3;
After described employing sulphur heart yearn increasing sulphur comprises slag melting getting well, with feeding wire machine feeding sulphur heart yearn, adjustment S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
Described employing VD type ladle refining furnace carries out process to molten steel and comprises and ladle is hung in VD stove, evacuated time >=20 minute, makes its vacuum tightness≤67Pa;
The described denaturing agent that adds in casting cycle carries out hanging rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires in mould when spheroidizing is included in cast to the sulfide in molten steel, and add-on is 0.3 ~ 0.5kg/ ton molten steel.
2. 3Cr2MnMoS die steel refining denaturing agent Adding Way according to claim 1, is characterized in that: the method comprises the following steps:
S1, employing electric arc furnace EF melting 3Cr2MnMoS mould molten steel;
S2, employing ladle refining LF carry out refining to 3Cr2MnMoS mould molten steel, and comprise, deoxidation also adjusts alloy ingredient;
S3, employing firebrick block make acid slag, and comprise, add the slag making of firebrick block and make basicity of slag be 1.1 ~ 1.4, the composition of described firebrick block is the SiO of weight ratio 60%
2with 40% Al
2o
3;
S4, adopt sulphur heart yearn to increase sulphur, comprise, slag melting good after, with feeding wire machine feeding sulphur heart yearn, adjustment S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
S5, employing VD type ladle refining furnace process molten steel, comprise, ladle are hung in VD stove, evacuated time >=20 minute, make its vacuum tightness≤67Pa;
S6, add denaturing agent carry out spheroidizing to the sulfide in molten steel in casting cycle, comprise, hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires when pouring into a mould in mould, add-on is 0.3 ~ 0.5kg/ ton molten steel.
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2013
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CN1363439A (en) * | 2001-07-20 | 2002-08-14 | 南京理工大学 | Conticasting technology for feeding rare-earth wires into tundish |
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