CN105506212B - A kind of high alumina Multiphase Steel and its smelting process - Google Patents
A kind of high alumina Multiphase Steel and its smelting process Download PDFInfo
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- CN105506212B CN105506212B CN201510982798.9A CN201510982798A CN105506212B CN 105506212 B CN105506212 B CN 105506212B CN 201510982798 A CN201510982798 A CN 201510982798A CN 105506212 B CN105506212 B CN 105506212B
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- deoxidation
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- aluminium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of high alumina Multiphase Steel and its smelting process, the high alumina Multiphase Steel smelting process includes：Desulphurised hot metal is added into dephosphorization converter and decarburization converter carries out duplex smelting, molten steel carries out deoxidation tapping after end is bessemerized in decarburization, wherein, the aluminium deoxidation recovery rate 88%~92% of deoxidation tapping process, the aluminium alloying recovery rate 78%~82% of deoxidation tapping process, the aluminium target content of deoxidation tapping process is 1.4%~1.5%；Molten steel after being tapped to deoxidation carries out LF refining；RH refinings are carried out under vacuum to the molten steel after LF refining；Molten steel after being refined to RH carries out Calcium treatment and completes to smelt after handling per the 550m of stove line feeding 450；Full guard cast is carried out to completing molten steel after smelting.The aluminium content for efficiently solving existing Al deoxidization steel is low, the technical problem of the actually required target component of high alumina Multiphase Steel is not reached, the alloying recovery rate of aluminium is high on the premise of production stability is not reduced, smelt the high alumina Multiphase Steel of final aluminium content 1.2% 1.4%, reach the target component of actual steel grade needed for user.
Description
Technical field
The present invention relates to process for making technical field, more particularly to a kind of high alumina Multiphase Steel and its smelting process.
Background technology
In the composition design of high-strength steel, aluminium has the function that stable austenite, obtains paralympic tissue, residual in deformation process
Austria is transformed into martensite, improves the obdurability of strip.And the difficulty of steelmaking process aluminium alloying is greater than other elements, therefore
Aluminium content is below 0.1% in steel.High alumina Multiphase Steel described in this method, aluminium content reach more than 1%, existing smelter
Skill, the alloying difficulty of aluminium is big, and the loss of smelting process aluminium component is more, does not reach the actually required target component of high alumina Multiphase Steel.
Aluminium and covering slag reaction cause cast difficult in casting process steel, and Cleanliness of Molten Steel is poor.
The content of the invention
The embodiment of the present invention is by providing a kind of high alumina Multiphase Steel and its smelting process, the aluminium for solving existing Al deoxidization steel
Content is low, so as to not reach the technical problem of the actually required target component of high alumina Multiphase Steel.
In a first aspect, the embodiments of the invention provide a kind of high alumina Multiphase Steel smelting process, comprise the following steps：
Desulphurised hot metal is added into dephosphorization converter and decarburization converter carries out duplex smelting, after end is bessemerized in the decarburization
Molten steel carries out deoxidation tapping, wherein, the deoxidation tapping process control aluminium deoxidation recovery rate 88%~92%, the deoxidation tapping
Process control aluminium alloying recovery rate 78%~82%, the deoxidation tapping process control aluminium target content for 1.4%~
1.5%；
Molten steel after being tapped to the deoxidation carries out LF refining；
RH refinings are carried out under vacuum to the molten steel after the LF refining；
Molten steel after being refined to the RH carries out Calcium treatment and completes to smelt after handling per stove line feeding 450-550m；
To the molten steel progress full guard cast completed after smelting.
Preferably, it is described to it is described complete smelt after molten steel carry out full guard casting process in, pulling rate be 1.0~
1.1m/min, the degree of superheat are 40~55 DEG C.
Preferably, the endpoint carbon content for controlling the decarburization to bessemerize is 0.03%~0.07%.
Preferably, the outlet temperature for controlling the decarburization to bessemerize is 1685-1705 DEG C.
Preferably, before the progress deoxidation tapping, the high alumina Multiphase Steel smelting process also includes：In ladle bottom
Add 3900~4100kg of aluminum shot.
Preferably, described after ladle bottom adds 3900~4100kg of aluminum shot, the high alumina complex phase steel smelting side
Method also includes：
Aluminum shot 1600-1800kg is added and with addition of manganeisen by chute in the deoxidation tapping process.Preferably,
After the progress deoxidation tapping and before the progress LF refining, the high alumina Multiphase Steel smelting process also includes：
900~1100kg limes are added into the ladle, temperature is finely adjusted to knot during the LF refining
Shu Wendu is 1630-1640 DEG C.
Second aspect, the embodiments of the invention provide a kind of high alumina Multiphase Steel, by the high alumina complex phase described in second aspect
Steel smelting method, which is smelted, to be formed, wherein, the high alumina Multiphase Steel is made up of following chemical composition：C：0.15%~0.17%, Mn：
1.4%-1.6%, P<0.02%, S<0.007%, Al：1.2%-1.4%, N<0.005%, remaining is Fe and impurity.
The one or more technical schemes provided in the embodiment of the present invention, have at least the following technical effects or advantages：
1st, as a result of by the control of deoxidation tapping process aluminium deoxidation recovery rate 88%~92%, deoxidation tapping process
The control of aluminium alloying recovery rate is 78%~82%, and the control of deoxidation tapping process aluminium target content is in 1.4%~1.5%, RH essences
Molten steel after refining, so as to improve the alloying of deoxidation tapping process aluminium, efficiently solves existing aluminium per stove line feeding 450-550m
The aluminium content of dexidized steel is low, so as to not reach the technical problem of the actually required target component of high alumina Multiphase Steel, realizes and is not dropping
The alloying recovery rate of aluminium is improved on the premise of low production stability, and the high alumina for smelting final aluminium content 1.2%-1.4% is answered
Xiang Gang, reach the target component of actual steel grade needed for user.
2nd, Cleanliness of Molten Steel is improved to molten steel Calcium treatment as a result of after refining terminates, controlled in casting process
40~55 DEG C of 1.0~1.1m/min of pulling rate and the degree of superheat, so that the full guard cast of the low pulling rate of this high degree of superheat improves steel
Water castability, while Cleanliness of Molten Steel is further ensured, therefore efficiently solve aluminium and covering slag reaction in casting process steel
Cause cast difficult, the technical problem of Cleanliness of Molten Steel difference.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the process chart of high alumina Multiphase Steel smelting process in the embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
With reference to shown in figure 1, a kind of high alumina Multiphase Steel smelting process provided in an embodiment of the present invention, comprise the following steps：
S101, desulphurised hot metal is added to dephosphorization converter and decarburization converter progress duplex smelting, end is bessemerized in decarburization
Molten steel carries out deoxidation tapping afterwards, wherein, deoxidation tapping process control aluminium deoxidation recovery rate 88%~92%, deoxidation tapping process control
Aluminium alloying recovery rate 78%~82% processed, it is 1.4%~1.5% that deoxidation tapping process, which controls aluminium target content,.
Specifically, by adding aluminum shot 3900-4100kg in each ladle bottom before deoxidation is tapped, convertor deacidification goes out
Aluminum shot 1600-1800kg is added into molten steel by chute during steel, to also to steel while aluminum shot is added by chute
Manganeisen is added in water, it is achieved thereby that the coarse adjustment in deoxidation tapping process to alloying component, ensure that pour steel
Composition reaches the target component of actual steel grade needed for user.
Further, the terminal for controlling decarburization to bessemerize in duplex smelting is that carbon content is：0.03%~0.07%,
1685-1705 DEG C of the outlet temperature that decarburization is bessemerized.
In specific implementation process, dephosphorization converter and decarburization converter that duplex is smelted are smelted using 300 tons of converters.
S102, LF (ladle furnace, ladle furnace) refinings are carried out to the molten steel after deoxidation tapping.
Specifically, slag making desulfurization is carried out during LF refining.
In specific implementation process, by adding 900-1100kg limes in each ladle before carrying out LF refining, realize
Slag making desulfurization is carried out during LF refining, then LF refining is carried out to the molten steel after deoxidation tapping, so as to play desulfidation.
Specifically, it is 1630-1640 DEG C temperature to be finely adjusted also during LF refining to the end temp of LF refining.
In specific implementation process, the end temp of LF refining is finely adjusted by heated by electrodes, so that LF is smart
The end temp of refining is controlled in 1630-1640 DEG C.
S103, RH refinings are carried out under vacuum to the molten steel after LF refining.
Specifically, the vacuum of vacuum outgas condition is below 100Pa.
Specifically, the full name of RH refinings：RH vacuum circulation degassing purifying methods, wherein RH refine skill for Germany at that time using RH
The first letter of the Liang Ge producers of art.The end temp of RH refinings is controlled in 1585-1595 DEG C.
S104, Calcium treatment is carried out to the molten steel after RH refinings and smelting, RH essences are completed after being handled per stove line feeding 450-550m
Refining terminates to show that Calcium treatment improves Cleanliness of Molten Steel to molten steel, is realized per stove line feeding 450-550m to the micro- of molten steel composition
Adjust.
In specific implementation process, carry out LF refining using 300 tons of LF refining devices and 300 tons of RH purifiers carry out RH
Refining.
S105, carry out full guard cast to completing the molten steel after smelting.
Specifically, full guard is carried out to cast by filling pipe end, stopper and the road argon gas of Ban Jian tri-.
Specifically, it is 1.0~1.1m/ to completing the molten steel after smelting to carry out the casting speed control in full guard casting process
Min low pulling rate, the degree of superheat control of casting process is 40~55 DEG C of the high degree of superheat, so as to be carried out by above-mentioned casting process
The low pulling rate of the high degree of superheat full guard cast, improve pourability of molten steel, while further ensure Cleanliness of Molten Steel.
Based on same inventive concept, the embodiments of the invention provide a kind of high alumina Multiphase Steel, by previous embodiment
High alumina Multiphase Steel smelting process carries out smelting and formed, and the high alumina Multiphase Steel smelted is made up of following chemical composition：C
(carbon)：0.15%~0.17%, Mn (manganese)：1.4%-1.6%, P (phosphorus)<0.02%, S (sulphur)<0.007%, Al (aluminium)：
1.2%-1.4%, N (nitrogen)<0.005%, remaining is iron Fe and inevitable a small amount of impurity.
The high alumina Multiphase Steel smelting process of the present invention illustrate below by a smelting example for pouring time three stoves
It is bright：
First, desulphurised hot metal is added into dephosphorization converter and decarburization converter carries out duplex smelting, the aim carbon of decarburization converter contains
Amount is as shown in table 1, and outlet temperature that the oxygen content of deoxidation tapping, decarburization are bessemerized, ladle bottom add the amount of aluminum shot, chute
Shown in the amount of addition aluminum shot, the equal reference table 1 of molten steel aluminium content of deoxidation tapping.
The endpoint data of the decarburization converter of table 1. and deoxidation tapping data
Then, LF refining is carried out：900-1100kg granule limes are added in ladle before LF refining, LF refining is carried out to temperature
Fine setting, shown in the end temp reference table 2 of the LF refining of fine setting.
Then RH refinings are carried out：RH refinings are carried out under vacuum, shown in the end temp reference table 2 of RH refinings, RH
Refining carries out Calcium treatment and pure iron line is fed per stove after terminating, feed shown in pure iron line amount reference table 2.
Full guard cast is finally carried out, the degree of superheat and pulling rate of casting process are with reference to shown in table 2 below, ultimogenitary height
The aluminium content of aluminium Multiphase Steel is respectively 1.32%, 1.3%, 1.28%, more than 1.0%.
The data of the LF refining of table 2., RH refinings and casting process.
By the one or more technical schemes provided in the embodiments of the present invention, at least have the following technical effect that or
Advantage：
1st, as a result of by the control of deoxidation tapping process aluminium deoxidation recovery rate 88%~92%, deoxidation tapping process
The control of aluminium alloying recovery rate is 78%~82%, and the control of deoxidation tapping process aluminium target content is in 1.4%~1.5%, RH essences
Molten steel after refining, so as to improve the alloying of deoxidation tapping process aluminium, efficiently solves existing aluminium per stove line feeding 450-550m
The aluminium content of dexidized steel is low, does not reach the technical problem of the actually required target component of high alumina Multiphase Steel, and realizing is not reducing life
The alloying recovery rate of aluminium improves on the premise of production stability, smelts final aluminium content 1.2%-1.4% high alumina Multiphase Steel,
Reach the target component of actual steel grade needed for user.
2nd, Cleanliness of Molten Steel is improved to molten steel Calcium treatment as a result of after refining terminates, controlled in casting process
40~55 DEG C of 1.0~1.1m/min of pulling rate and the degree of superheat, so that the full guard cast of the low pulling rate of this high degree of superheat improves steel
Water castability, while Cleanliness of Molten Steel is further ensured, therefore efficiently solve aluminium and covering slag reaction in casting process steel
Cause cast difficult, the technical problem of Cleanliness of Molten Steel difference.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (1)
1. a kind of high alumina Multiphase Steel smelting process, it is characterised in that comprise the following steps：
Desulphurised hot metal is added into dephosphorization converter and decarburization converter carries out duplex smelting, the dephosphorization converter and decarburization converter that duplex is smelted
300 tons of converters are used, molten steel carries out deoxidation tapping after end is bessemerized in the decarburization, wherein, control the decarburization to turn
The endpoint carbon content of stove blowing is 0.03%~0.07%, and the outlet temperature for controlling the decarburization to bessemerize is 1685-1705
DEG C, before carrying out deoxidation tapping, 3900~4100kg of aluminum shot is added in ladle bottom, by slipping in the deoxidation tapping process
Groove adds aluminum shot 1600-1800kg and with addition of manganeisen, and the deoxidation tapping process control aluminium deoxidation recovery rate 88%~
92%, the deoxidation tapping process control aluminium alloying recovery rate 78%~82%, the deoxidation tapping process controls aluminium target
Content is 1.4%~1.5%；
After the progress deoxidation tapping and before the progress LF refining, 900~1100kg is added into the ladle
Lime；
Molten steel after being tapped to the deoxidation carries out LF refining, and during LF refining, temperature is carried out by heated by electrodes
Fine setting to end temp is 1630-1640 DEG C；
RH refinings are carried out under vacuum to the molten steel after the LF refining；
Molten steel after being refined to the RH carries out Calcium treatment and completes to smelt after feeding pure iron line 450-550m processing per stove；
To the molten steel progress full guard cast completed after smelting, all risk insurance is carried out in the molten steel to after the completion smelting
Protect in casting process, pulling rate is 1.0~1.1m/min, and the degree of superheat is 40~55 DEG C.
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| CN105506212B true CN105506212B (en) | 2018-03-06 |
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| CN101906502A (en) * | 2010-08-23 | 2010-12-08 | 首钢总公司 | Calcium treating method for reducing size of D and Ds type of inclusions containing aluminum steel |
| CN102952923A (en) * | 2012-11-27 | 2013-03-06 | 南京钢铁股份有限公司 | Process for smelting aluminum containing steel through calcium carbide deoxidation |
| CN103014221A (en) * | 2012-12-17 | 2013-04-03 | 莱芜钢铁集团有限公司 | Method for producing high-aluminum steel plate blanks |
| CN103627953A (en) * | 2013-12-12 | 2014-03-12 | 首钢总公司 | Aluminiferous complex phase steel insensitive to isothermal time and production method thereof |
| CN105154623A (en) * | 2015-07-30 | 2015-12-16 | 达力普石油专用管有限公司 | Efficient alloying method for smelting 38CrMoAl steel |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906502A (en) * | 2010-08-23 | 2010-12-08 | 首钢总公司 | Calcium treating method for reducing size of D and Ds type of inclusions containing aluminum steel |
| CN102952923A (en) * | 2012-11-27 | 2013-03-06 | 南京钢铁股份有限公司 | Process for smelting aluminum containing steel through calcium carbide deoxidation |
| CN103014221A (en) * | 2012-12-17 | 2013-04-03 | 莱芜钢铁集团有限公司 | Method for producing high-aluminum steel plate blanks |
| CN103627953A (en) * | 2013-12-12 | 2014-03-12 | 首钢总公司 | Aluminiferous complex phase steel insensitive to isothermal time and production method thereof |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |