CN103602785B - A kind of high speed heavy rail steel al-free deoxidation method of economical and efficient - Google Patents
A kind of high speed heavy rail steel al-free deoxidation method of economical and efficient Download PDFInfo
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- CN103602785B CN103602785B CN201310629016.4A CN201310629016A CN103602785B CN 103602785 B CN103602785 B CN 103602785B CN 201310629016 A CN201310629016 A CN 201310629016A CN 103602785 B CN103602785 B CN 103602785B
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Abstract
The invention discloses a kind of high speed heavy rail steel al-free deoxidation method of economical and efficient, described al-free deoxidation method adds reductor respectively at three Different periods in a tapping cycle, the reductor that described first time adds comprises: manganese metal: 0.64 ~ 0.68%, special silicon: 0.19 ~ 0.24%, Si-Ca-Ba: 0.04 ~ 0.06%, the reductor that described second time adds comprises: manganese metal: 0.36 ~ 0.40%, special silicon: 0.09 ~ 0.12%, Si-Ca-Ba: 0.04 ~ 0.06%, the reductor that described third time adds comprises: manganese metal: 0.14 ~ 0.17%, special silicon: 0.04 ~ 0.06%, Si-Ca-Ba: 0.25 ~ 0.38%, surplus is iron and other inevitable impurity.The present invention have meet Properties of Heavy Rail Steel By oxygen level requirement, simplify steel making working procedure, saved the feature of steel-making cost, smelting iron and steel technical field can be widely used in.
Description
Technical field
The present invention relates to smelting iron and steel technical field, particularly relate to a kind of high speed heavy rail steel al-free deoxidation method of economical and efficient.
Background technology
In order to improve the quality grade of heavy rail, to adapt to the requirement of market to high-speed overload rail, and drawing close to international standard, requiring that rail has higher purity.The provisional technological standard of high-speed railway heavy rail steel has all done stricter regulation to total oxygen, Holo-Al content etc. in rail, i.e. w([T.O in rail])≤20 × 10
-6, w([Alt])≤40 × 10
-6, as can be seen from technological standard, should meet the oxygen level in rail, aluminium can not be used again in steelmaking process to carry out deep deoxidation, be that Properties of Heavy Rail Steel By smelts the technical barrier faced.
Usual Properties of Heavy Rail Steel By is smelted in tapping process can only select silicon, manganese alloy realizes al-free deoxidation, and then through LF(Ladle Furnace, ladle furnace) external refining and RH(RH be respectively the first letter of the Liang Jia manufacturer of nineteen fifty-nine Germany's invention RH vacuum processing technique) vacuum processing technique continues deoxidation and could meet w([T.O in rail])≤20 × 10
-6, w([Alt])≤40 × 10
-6.LF refining treatment technique needs, through heating, slag making and deoxidation three links, also to need to add 3 ~ 10kg/t silicon, manganese alloy reductor, more than at least 40 minutes treatment time during deoxidation.RH vacuum-treat makes the oxygen level in steel reduce further by reaction between carbon and oxygen, more than process at least 30 times minute.
Through investigating and studying known, employing silicon in the past, manganese alloy carry out al-free deoxidation, and Properties of Heavy Rail Steel By is greater than 40 × 10 at LF external refining total oxygen content before treatment
-6.
Summary of the invention
The object of the invention is the deficiency in order to overcome above-mentioned background technology, a kind of high speed heavy rail steel al-free deoxidation method of economical and efficient is provided, there is the requirement meeting Properties of Heavy Rail Steel By oxygen level, the feature simplifying steel making working procedure, saved steel-making cost, improve steel-making efficiency.
The high speed heavy rail steel al-free deoxidation method of a kind of economical and efficient provided by the invention, described al-free deoxidation method adds reductor respectively at three Different periods in a tapping cycle, the reductor that described first time adds comprises the component of following weight percent: manganese metal: 0.64 ~ 0.68%, special silicon: 0.19 ~ 0.24%, Si-Ca-Ba: 0.04 ~ 0.06%, the reductor that described second time adds comprises following component and weight part: manganese metal: 0.36 ~ 0.40%, special silicon: 0.09 ~ 0.12%, Si-Ca-Ba: 0.04 ~ 0.06%, the reductor that described third time adds comprises following component and weight part: manganese metal: 0.14 ~ 0.17%, special silicon: 0.04 ~ 0.06%, Si-Ca-Ba: 0.25 ~ 0.38%, surplus is iron and other inevitable impurity.In tapping process, manganese metal, special silicon and Si-Ca-Ba are best reductors, and select pure manganese metal and special silicon materials, not only deoxidation effect is good, and the high purity of molten steel; Carry out deep deoxidation with the strong reductor of Si-Ca-Ba compound, oxygen content in steel can be made to be reduced to less than 0.0020% level.
In technique scheme, described al-free deoxidation method is respectively in 1/4 of a tapping cycle, 1/2, 3/4 period added reductor, the reductor that described first time adds comprises following component and weight part: manganese metal: 0.65%, special silicon: 0.22%, Si-Ca-Ba: 0.05%, the reductor that described second time adds comprises following component and weight part: manganese metal: 0.38%, special silicon: 0.11%, Si-Ca-Ba: 0.05%, the reductor that described third time adds comprises following component and weight part: manganese metal: 0.1:6%, special silicon: 0.05%, Si-Ca-Ba: 0.33%, surplus is iron and other inevitable impurity.Reductor is added in 1/4,1/2,3/4 period in a tapping cycle respectively during tapping, be conducive to making the fusing of reductor more even, simultaneously according to the principle of carrying out deep deoxidation after first carrying out weak deoxidation, throw in the input ratio increasing manganese metal and special silicon early stage of reductor, later stage strengthens the content of Si-Ca-Ba in reductor, to reach better deoxidation effect.
The high speed heavy rail steel al-free deoxidation method of economical and efficient of the present invention, there is following beneficial effect: on the basis of requirement meeting Properties of Heavy Rail Steel By oxygen level, the technique of deoxidation is continued owing to eliminating LF external refining and RH vacuum processing technique etc., improve production efficiency, reduce cost, simplify steel making working procedure, make operation simpler, the not defeated high speed heavy rail steel refined out in prior art of product composition stability.
Embodiment
Below in conjunction with form and embodiment, the present invention is described in further detail, but this embodiment should not be construed as limitation of the present invention.
Embodiment 1
Described al-free deoxidation method is respectively a duration is the tapping cycle of 10 minutes the 3rd, 5, 7 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 240kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 120kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 60kg, Si-Ca-Ba: 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0018%.
Embodiment 2
Described al-free deoxidation method is respectively a duration is the tapping cycle of 4 minutes the 1st, 2, 3 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 228kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 114kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal 192kg, special silicon 57kg, Si-Ca-Ba 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0015%.
Embodiment 3
Described al-free deoxidation method is respectively a duration is the tapping cycle of 8 minutes the 2nd, 4, 7 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component parts of following weight: manganese metal: 768kg, special silicon: 284kg, Si-Ca-Ba: 51kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 139kg, Si-Ca-Ba: 51kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 70kg, Si-Ca-Ba: 303kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0016%.
Embodiment 4
Described al-free deoxidation method is respectively a duration is the tapping cycle of 10 minutes the 2nd, 5, 7 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 228kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 114kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0014%.
Embodiment 5
Described al-free deoxidation method is respectively a duration is the tapping cycle of 8 minutes the 2nd, 4, 6 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 228kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 114kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0017%.
Embodiment 6
Described al-free deoxidation method is respectively a duration is the tapping cycle of 6 minutes the 1st, 3, 4 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 228kg, Si-Ca-Ba: 61kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 114kg, Si-Ca-Ba: 61kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 370kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0015%.
Embodiment 7
Described al-free deoxidation method is respectively a duration is the tapping cycle of 4 minutes the 1st, 2, 3 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 228kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 114kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0017%.
Embodiment 8
Described al-free deoxidation method is respectively a duration is the tapping cycle of 12 minutes the 3rd, 6, within 8 minutes, add reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 230kg, Si-Ca-Ba: 62kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 115kg, Si-Ca-Ba: 62kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 372kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0012%.
Embodiment 9
Described al-free deoxidation method is respectively a duration is the tapping cycle of 10 minutes the 2nd, 5, within 8 minutes, add reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 228kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 114kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0017%.
Embodiment 10
Described al-free deoxidation method is respectively a duration is the tapping cycle of 4 minutes the 1st, 2, 3 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 770kg, special silicon: 228kg, Si-Ca-Ba: 53kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 450kg, special silicon: 114kg, Si-Ca-Ba: 53kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 318kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0015%.
Embodiment 11
Described al-free deoxidation method is respectively a duration is the tapping cycle of 6 minutes the 1st, 2, 4 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 816kg, special silicon: 228kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 475kg, special silicon: 114kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 202kg, special silicon: 57kg, Si-Ca-Ba: 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0013%.
Embodiment 12
Described al-free deoxidation method is respectively a duration is the tapping cycle of 8 minutes the 2nd, 4, 7 points of clockwise weighs in the molten steel of 120 tons and adds reductor, the reductor that described first time adds comprises the component of following weight: manganese metal: 768kg, special silicon: 228kg, Si-Ca-Ba: 50kg, the reductor that described second time adds comprises the component of following weight: manganese metal: 440kg, special silicon: 114kg, Si-Ca-Ba: 50kg, the reductor that described third time adds comprises the component of following weight: manganese metal: 192kg, special silicon: 57kg, Si-Ca-Ba: 300kg, surplus is iron and other inevitable impurity.After testing, the total oxygen content in high speed heavy rail steel is 0.0012%.
Each embodiment high speed Properties of Heavy Rail Steel By al-free deoxidation method and concrete total oxygen content are see table 1, and as can be seen from the table, the total oxygen content of each embodiment all controls 20 × 10
-6within, meet the technical indicator of high speed heavy rail steel, the not defeated high speed heavy rail steel made in any existing al-free deoxidation method.
Table 1 high speed heavy rail steel al-free deoxidation method and total oxygen content thereof
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
The content be not described in detail in this specification sheets belongs to the known prior art of professional and technical personnel in the field.
Claims (2)
1. the high speed heavy rail steel al-free deoxidation method of an economical and efficient, it is characterized in that: described al-free deoxidation method adds reductor respectively at three Different periods in a tapping cycle, the reductor that described first time adds comprises the component of following weight percent: manganese metal: 0.64 ~ 0.68%, special silicon: 0.19 ~ 0.24%, Si-Ca-Ba: 0.04 ~ 0.06%, the reductor that described second time adds comprises the component of following weight percent: manganese metal: 0.36 ~ 0.40%, special silicon: 0.09 ~ 0.12%, Si-Ca-Ba: 0.04 ~ 0.06%, the reductor that described third time adds comprises the component of following weight percent: manganese metal: 0.14 ~ 0.17%, special silicon: 0.04 ~ 0.06%, Si-Ca-Ba: 0.25 ~ 0.38%.
2. the high speed heavy rail steel al-free deoxidation method of economical and efficient according to claim 1, it is characterized in that: described al-free deoxidation method is respectively in 1/4 of a tapping cycle, 1/2, 3/4 period added reductor, the reductor that described first time adds comprises the component of following weight percent: manganese metal: 0.65%, special silicon: 0.22%, Si-Ca-Ba: 0.05%, the reductor that described second time adds comprises the component of following weight percent: manganese metal: 0.38%, special silicon: 0.11%, Si-Ca-Ba: 0.05%, the reductor that described third time adds comprises the component of following weight percent: manganese metal: 0.1:6%, special silicon: 0.05%, Si-Ca-Ba: 0.33%.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864275A (en) * | 2012-09-25 | 2013-01-09 | 鞍钢股份有限公司 | Control method for aluminum content of heavy rail steel |
| CN103146882A (en) * | 2013-03-23 | 2013-06-12 | 鞍钢股份有限公司 | Method for controlling type B inclusion of steel rail for high-speed railway |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864275A (en) * | 2012-09-25 | 2013-01-09 | 鞍钢股份有限公司 | Control method for aluminum content of heavy rail steel |
| CN103146882A (en) * | 2013-03-23 | 2013-06-12 | 鞍钢股份有限公司 | Method for controlling type B inclusion of steel rail for high-speed railway |
Non-Patent Citations (2)
| Title |
|---|
| 转炉冶炼重轨钢技术操作控制及效果;张永智等;《包钢科技》;20040831;第30卷(第4期);第1.5节 * |
| 高强度耐蚀钢轨的研究;任安超;《中国博士学位论文全文数据库 工程科技Ⅰ辑》;20130515;第4.1.2.2，4.1.2.8节 * |
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