CN103710490A - Method for adding refining denaturant in 3Cr2MnMoS die steel - Google Patents

Method for adding refining denaturant in 3Cr2MnMoS die steel Download PDF

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Publication number
CN103710490A
CN103710490A CN201310695686.6A CN201310695686A CN103710490A CN 103710490 A CN103710490 A CN 103710490A CN 201310695686 A CN201310695686 A CN 201310695686A CN 103710490 A CN103710490 A CN 103710490A
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molten steel
refining
slag
3cr2mnmos
sulphur
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CN201310695686.6A
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CN103710490B (en
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莫敦
邓吉宁
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JIANGYOU CHANGXIANG SPECIAL STEEL MANUFACTURING Co Ltd
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JIANGYOU CHANGXIANG SPECIAL STEEL MANUFACTURING Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention provides a method for adding a refining denaturant in 3Cr2MnMoS die steel, which is used for solving such problems of a method for adding a refining denaturant in 3Cr2MnMoS die steel in the prior art that the denaturant yield is low to cause unstable denaturation effect and low nodularization rate of internal impurities of a steel matrix, and the like. 3Cr2MnMoS die steel is produced by an electric arc furnace EF and ladle refining LF. The method is characterized by comprising the following steps: producing acidic slag by fire bricks after LF deoxidating and regulating the other components, increasing sulfur by using a sulfur core wire, treating molten steel through a VD type ladle refining furnace after removing 80wt% of slag, adding the denaturant in a casting process for spheroidizing sulfides in the molten steel. The method for adding refining denaturant in 3Cr2MnMoS die steel provided by the invention has the beneficial effects of being capable of greatly improving the denaturant yield and ensuring the nodularization of the majority of sulfide impurities, and the qualified rate of flaw detection of the produced die steel is larger than 95%.

Description

3Cr2MnMoS die steel refining denaturing agent adds method
Technical field
The present invention relates to a kind of senior die steel refining techniques, specially refer to a kind of 3Cr2MnMoS die steel refining denaturing agent and add method.
Background technology
3Cr2MnMoS die steel is the die steel (conventionally also referred to as German Bu Delusi 3Cr2MnMoS die steel) of German standard, because it has comparatively applicable hardness, intensity and surface smoothness, be usually used on the large-sized plastic rubber mould, mould bases of requirement high surface finish, as: bumper, housing of TV set mould etc.
Conventionally, adopt the explained hereafter 3Cr2MnMoS die steel of electric arc furnace EF+ ladle refining LF or VD type ladle refining furnace, when EF smelts, adopt oxidation style, 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 matrix i nside sulfid to be mingled with content also higher, at hot procedure medium sulphide content, be mingled with easy generation internal fissure, while making hot-work part usually because of carrying out flaw detection, internal fissure exceeds standard and scraps.For this reason, take to add denaturing agent inclusion to be carried out to the mode of denaturing treatment, be about to inclusion and carry out spheroidizing, with this, reduce the impact of inclusion on steel matrix internal fissure.So-called denaturing agent is generally rare earth element, as Ce, Y etc., adds the inclusion that can make after denaturing agent to separate out with strip MnS form to change over the form of the rare-earth sulfides such as spherical CeS and separates out.And spherical rare-earth sulfide is compared with strip MnS, in hot procedure, there is better hot-workability, be difficult for to produce internal fissure and flaw detection qualification rate is significantly improved.Conventionally, the add-on of rare earth element is 1~1.3 times of S content.It is to add denaturing agent in VD type ladle refining process that prior art 3Cr2MnMoS die steel refining denaturing agent adds method, 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 that forms spherical rare-earth sulfide is reduced, make its sex change effect unstable, unreliable.Conventionally, by forming the denaturing agent quantity of spherical sulfide and the ratio of its add-on, be referred to as denaturing agent recovery rate, and weigh the service efficiency of denaturing agent with this.Obviously, it is lower that prior art 3Cr2MnMoS die steel refining denaturing agent adds method to exist the recovery rate of denaturing agent, makes the problems such as unstable and nodularization rates steel matrix inner clamps foreign material of its sex change effect are lower.
Summary of the invention
For solving prior art 3Cr2MnMoS die steel refining denaturing agent, add the denaturing agent recovery rate of method existence lower, make the problems such as unstable and nodularization rates steel matrix inner clamps foreign material of its sex change effect are lower, the present invention proposes a kind of 3Cr2MnMoS die steel refining denaturing agent and adds method.3Cr2MnMoS die steel refining denaturing agent of the present invention adds method to adopt electric arc furnace EF+ ladle refining LF to produce 3Cr2MnMoS die steel, it is characterized in that: in LF deoxidation with adjust after other compositions, adopt firebrick piece to make acid slag, adopt sulphur heart yearn to increase sulphur, after removing the slag of weight percent 80%, adopt VD type ladle refining furnace to process molten steel, and in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel;
After described employing firebrick piece is made acid slag and is included in the deoxidation of LF stove and composition adjustment and completes, adding the slag making of firebrick piece and making basicity of slag is 1.1~1.4, and the composition of described firebrick piece is the SiO of weight ratio 60% 2with 40% Al 2o 3;
After described employing sulphur heart yearn increasing sulphur comprises that slag melts well, with feeding wire machine feeding sulphur heart yearn, adjust S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
Described employing VD type ladle refining furnace is processed and is comprised ladle is hung in to VD stove molten steel, and evacuated time >=20 minute, make its vacuum tightness≤67Pa;
Describedly in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel to be included in when cast mould and to hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires, add-on is 0.3~0.5kg/ ton molten steel.
Further, 3Cr2MnMoS die steel refining denaturing agent of the present invention adds 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, comprise, deoxidation is also adjusted alloy ingredient;
S3, employing firebrick piece are made acid slag, comprise, adding the slag making of firebrick piece and making basicity of slag is 1.1~1.4, and the composition of described firebrick piece is the SiO of weight ratio 60% 2with 40% Al 2o 3;
S4, employing sulphur heart yearn increase sulphur, comprise, after slag melts well, with feeding wire machine feeding sulphur heart yearn, adjust S content to 0.09%, and the S content of described sulphur heart yearn is weight ratio 60%;
S5, employing VD type ladle refining furnace are processed molten steel, comprise, ladle is hung in to VD stove, and evacuated time >=20 minute, make its vacuum tightness≤67Pa;
S6, in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel, comprise, when cast, in mould, hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires, add-on is 0.3~0.5kg/ ton molten steel.
It is the recovery rate that can significantly improve denaturing agent that 3Cr2MnMoS die steel refining denaturing agent of the present invention adds the useful technique effect of method, guarantees that most sulfide inclusions are by nodularization, and the die steel carrying out flaw detection qualification rate of producing is greater than 95%.
Accompanying drawing explanation
Accompanying drawing 1 is the step schematic diagram that 3Cr2MnMoS die steel refining denaturing agent of the present invention adds method.
Below in conjunction with the drawings and specific embodiments, to 3Cr2MnMoS die steel refining denaturing agent of the present invention, add method to be further described.
Embodiment
Accompanying drawing 1 is the step schematic diagram that 3Cr2MnMoS die steel refining denaturing agent of the present invention adds method, as seen from the figure, 3Cr2MnMoS die steel refining denaturing agent of the present invention adds method to adopt electric arc furnace EF+ ladle refining LF to produce 3Cr2MnMoS die steel, it is characterized in that: in LF deoxidation with adjust after other compositions, adopt firebrick piece to make acid slag, adopt sulphur heart yearn to increase sulphur, after removing the slag of weight percent 80%, adopt VD type ladle refining furnace to process molten steel, and in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel;
After described employing firebrick piece is made acid slag and is included in the deoxidation of LF stove and composition adjustment and completes, adding the slag making of firebrick piece and making basicity of slag is 1.1~1.4, and the composition of described firebrick piece is the SiO of weight ratio 60% 2with 40% Al 2o 3;
After described employing sulphur heart yearn increasing sulphur comprises that slag melts well, with feeding wire machine feeding sulphur heart yearn, adjust S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
Described employing VD type ladle refining furnace is processed and is comprised ladle is hung in to VD stove molten steel, and evacuated time >=20 minute, make its vacuum tightness≤67Pa;
Describedly in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel to be included in when cast mould and to hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires, add-on is 0.3~0.5kg/ ton molten steel.
3Cr2MnMoS die steel refining denaturing agent of the present invention adds 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, comprise, deoxidation is also adjusted alloy ingredient;
S3, employing firebrick piece are made acid slag, comprise, adding the slag making of firebrick piece and making basicity of slag is 1.1~1.4, and the composition of described firebrick piece is the SiO of weight ratio 60% 2with 40% Al 2o 3;
S4, employing sulphur heart yearn increase sulphur, comprise, after slag melts well, with feeding wire machine feeding sulphur heart yearn, adjust S content to 0.09%, and the S content of described sulphur heart yearn is weight ratio 60%;
S5, employing VD type ladle refining furnace are processed molten steel, comprise, ladle is hung in to VD stove, and evacuated time >=20 minute, make its vacuum tightness≤67Pa;
S6, in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel, comprise, when cast, in mould, hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires, add-on is 0.3~0.5kg/ ton molten steel.
Embodiment 1
Heat (batch) number 13V122, steel grade 3Cr2MnMoS, ingot shape 10.6T, 2 of numbers;
Electric arc furnace EF melting, oxygen blast is fluxed, and oxygen is pressed 0.4Mpa; Dark oxygen blast, oxygen is pressed 1.0Mpa; Sampling, skims 90%, 1635 ℃ of tappings of temperature, 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, and high carbon ferromanganese 450kg, molybdenum-iron 30kg, 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 piece 400kg, basicity of slag is 1.1~1.4, and the composition of described firebrick piece is the SiO of weight ratio 60% 2with 40% Al 2o 3;
Sulphur heart yearn increases sulphur, adjusts 1630 ℃ of left and right of molten steel temperature, 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, adjusts 1650 ℃ of left and right of molten steel temperature, and vapor pressure 1Mpa starts to find time; Vacuum tightness 67Pa keeps 15 minutes, and vacuum tightness 39Pa is broken empty, adjusts 157 ℃ of left and right of temperature, hangs out and waters steel;
Casting: adopt 10.6T ingot mould, hang in respectively rare-earth wires 4.5kg 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, 2 of numbers; The making step of embodiment 2 is identical with embodiment 1, and supplementary material add-on, condition are controlled 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 every 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 are controlled all identical with embodiment 2 with Composition Control.
The steel ingot of embodiment 1~3 cast is carrying out carrying out flaw detection to it after hot-work, and it is qualified that all steel ingots are.Composition assay and the flaw detection of embodiment 1~3 the results are shown in following table.
As can be seen from the above table, invention 3Cr2MnMoS die steel refining denaturing agent adds method, in casting cycle, add rare earth, 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 oxidized possibility of rare earth element is reduced greatly, and its overwhelming majority has formed spherical rare-earth sulfide.
Obviously, it is the recovery rate that can significantly improve denaturing agent that 3Cr2MnMoS die steel refining denaturing agent of the present invention adds the useful technique effect of method, guarantees that most sulfide inclusions are by nodularization, and the die steel carrying out flaw detection qualification rate of producing is greater than 95%.

Claims (2)

1. a 3Cr2MnMoS die steel refining denaturing agent adds method, it is characterized in that: adopt electric arc furnace EF+ ladle refining LF to produce 3Cr2MnMoS die steel, it is characterized in that: in LF deoxidation with adjust after other compositions, adopt firebrick piece to make acid slag, adopt sulphur heart yearn to increase sulphur, after removing the slag of weight percent 80%, adopt VD type ladle refining furnace to process molten steel, and in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel;
After described employing firebrick piece is made acid slag and is included in the deoxidation of LF stove and composition adjustment and completes, adding the slag making of firebrick piece and making basicity of slag is 1.1~1.4, and the composition of described firebrick piece is the SiO of weight ratio 60% 2with 40% Al 2o 3;
After described employing sulphur heart yearn increasing sulphur comprises that slag melts well, with feeding wire machine feeding sulphur heart yearn, adjust S content to 0.09%, the S content of described sulphur heart yearn is weight ratio 60%;
Described employing VD type ladle refining furnace is processed and is comprised ladle is hung in to VD stove molten steel, and evacuated time >=20 minute, make its vacuum tightness≤67Pa;
Describedly in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel to be included in when cast mould and to hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires, add-on is 0.3~0.5kg/ ton molten steel.
2. 3Cr2MnMoS die steel refining denaturing agent adds method according to claim 1, it 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, comprise, deoxidation is also adjusted alloy ingredient;
S3, employing firebrick piece are made acid slag, comprise, adding the slag making of firebrick piece and making basicity of slag is 1.1~1.4, and the composition of described firebrick piece is the SiO of weight ratio 60% 2with 40% Al 2o 3;
S4, employing sulphur heart yearn increase sulphur, comprise, after slag melts well, with feeding wire machine feeding sulphur heart yearn, adjust S content to 0.09%, and the S content of described sulphur heart yearn is weight ratio 60%;
S5, employing VD type ladle refining furnace are processed molten steel, comprise, ladle is hung in to VD stove, and evacuated time >=20 minute, make its vacuum tightness≤67Pa;
S6, in casting cycle, add denaturing agent to carry out spheroidizing to the sulfide in molten steel, comprise, when cast, in mould, hang rare-earth wires, content of rare earth >=99% weight ratio of described rare-earth wires, add-on is 0.3~0.5kg/ ton molten steel.
CN201310695686.6A 2013-12-17 2013-12-17 3Cr2MnMoS die steel refining denaturing agent Adding Way Expired - Fee Related CN103710490B (en)

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Cited By (1)

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CN106893799A (en) * 2015-12-18 2017-06-27 中国科学院金属研究所 High-purity H13 hot die steel methods are prepared using aluminium rare earth composite deoxidation

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CN1986839A (en) * 2005-12-22 2007-06-27 攀枝花钢企工贸有限责任公司 Process of producing high quality carbon steel ingot with aluminium and RE added for high grade forging
JP2007302987A (en) * 2006-05-15 2007-11-22 Sanyo Special Steel Co Ltd Method of improving yield of chromium in melting low phosphorus-chromium-containing tool steel in electric furnace
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106893799A (en) * 2015-12-18 2017-06-27 中国科学院金属研究所 High-purity H13 hot die steel methods are prepared using aluminium rare earth composite deoxidation
CN106893799B (en) * 2015-12-18 2019-02-19 中国科学院金属研究所 High-purity H13 hot die steel method is prepared using aluminium rare earth composite deoxidation

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