CN101906502A - Calcium treating method for reducing size of D and Ds type of inclusions containing aluminum steel - Google Patents
Calcium treating method for reducing size of D and Ds type of inclusions containing aluminum steel Download PDFInfo
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- CN101906502A CN101906502A CN201010259957XA CN201010259957A CN101906502A CN 101906502 A CN101906502 A CN 101906502A CN 201010259957X A CN201010259957X A CN 201010259957XA CN 201010259957 A CN201010259957 A CN 201010259957A CN 101906502 A CN101906502 A CN 101906502A
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- calcium
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- soft blow
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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
- Y02P10/20—Recycling
Abstract
The invention discloses a calcium treating method for reducing the size of D and Ds types of inclusions containing aluminum steel, belonging to the field of steelmaking and refining and mainly relating to the steel ladle bottom blowing strength before and after calcium treatment, the control of inclusion denaturation treatment time and the selection of the calcium treatment time. In the invention, the calcium treatment is carried out after soft blowing ends, and at the moment, large grain inclusions sufficiently float upwards; and small grain inclusions left in steel are subjected to denaturation treatment, and then pouring is carried out, wherein the soft blowing time before the calcium treatment is controlled to be 5-20min, the soft bottom blowing flow rate is controlled to be smaller than 2L/min.t, the calcium content of molten steel after the calcium treatment is controlled to be 5-20ppm, the bottom blowing strength during the calcium treatment is smaller than 5L/min.t, the soft blowing time after the calcium treatment is controlled within 20min, and the steel ladle bottom blowing flow rate is controlled within 2L.min.t. The invention can effectively reduce the size of D and Ds type of inclusions.
Description
Technical field:
The present invention relates to make steel refinery practice, particularly reduce the treatment process that contains the aluminum steel inclusion
Background technology:
Non-metallic inclusion in the steel all is independent and exists mutually, and their existence has destroyed the continuity of steel matrix, causes the inhomogeneous of microtexture, thereby reduces plasticity, toughness and the fatigue property of steel.This be because non-metallic inclusion make steel when carry load with the vertical cross section upper stress of loading direction skewness, thereby cause stress concentration.Along with the increase of stress, non-metallic inclusion will be broken and generate the space.So non-metallic inclusion often is regarded as one of major reason of micro-flaw generation, the process of surrendering rupture failure from steel then is the process of micro-flaw expansion.The brittle fracture process of steel is processes of the generation and the development of crackle, and non-metallic inclusion plays an important role as one of origin of micro-flaw.Promptly at first form tiny crack or with original tiny crack, cavity or inclusion as the destruction source, under the effect of stress, a certain critical size is expanded in crackle or destruction source lentamente to, instantaneous generation brittle rupture.Ductile rupture also is micro-flaw or the formation in cavity and the process of growing up.As in Tensile Fracture Process, after a large amount of viscous deformation took place, steel forming micro-cavity on the brittle inclusion or on inclusion and the basal body interface, secondly were growing up and polymerization of micro-cavity, until fracture at first.Non-metallic inclusion shows as influence to the steel impact absorbing energy to the influence of ductile rupture; The influence of brittle rupture is then shown as the influence of brittle transition temperature.
For the kind that contains the bigger inclusion of aluminum steel plate property influence is that aluminate class and manganese sulfide class are mingled with, and this type impurity is through after the refining treatment, and inclusion collides the come-up of growing up; For the less inclusion that is difficult for come-up, needing to feed calcium handles, inclusion is carried out sex change, with aluminate and the sex change of manganese sulfide class is solid-state on-deformable low melting point, high rigidity Spherical Inhomogeneity thing down, and the calcium-aluminate type impurity after this class nodularization is mingled with for the harm of plate property much smaller than aluminate class and manganese sulfide class
The inclusion size of handling through the soft blow inclusion size of carrying out after the soft blow is big, carry out directly that calcium is handled and sex change after the inclusion fusing point low, form liquid spherical calcium-aluminate class and be mingled with, because that the calcium-aluminate type impurity is invaded the profit angle is big, be difficult for come-up, stayed in the steel easily.If will carry out the soft blow argon gas earlier through the molten steel after the refining treatment, make macrobead aluminate class, manganese sulfide type impurity fully remove, pass through to feed calcium line nodularization sex change, then D class after the nodularization in the steel and Ds type impurity size decreases to the less inclusion of remaining size.
Summary of the invention:
Purpose of the present invention overcomes defective of the prior art exactly, and the calcium treating method that provides a kind of reduction to contain D class and Ds type impurity size in the aluminum steel reduces D class and Ds type impurity size in the steel.
The present invention relates to the calcium treating method that a kind of reduction contains D class and Ds type impurity size in the aluminum steel, generally, calcium is handled after refining, soft blow begins to carry out before handling, and carries out soft blow after calcium is handled and pours into a mould then.The present invention at first carries out soft blow after the refining, carry out calcium after soft blow finishes and handle, and carries out soft blow and inclusion modification processing after the calcium processing finishes, and pours into a mould at last, it is characterized in that:
(1) the molten steel oxygen activity was controlled in the 25ppm after refining finished, and molten steel aluminium content (mass percent, down together) is between 0.005%-0.060%; Top slag FeO+MnO content is less than 5%, CaO/Al
2O
3=1.2-3.0;
(2) refining is carried out soft blow after finishing, and the soft blow flow is lower than the 2L/min.t steel, and the soft blow time is controlled at 5min-20min, carrying out calcium after soft blow finishes handles, molten steel Ca content is controlled at 5ppm-30ppm, and Ca/S is controlled between the 0.1-6.0, and the bottom blowing flow was lower than the 5L/min.t steel when calcium was handled;
(3) the calcium processing is carried out soft blow after finishing, and inclusion modification is handled, and the soft blow time is controlled in the 20min, and the bottom blowing flow control is in the 2L/min.t steel.
Embodiment
Embodiment 1:
The smelting of steel of certain power station, adopting process route: desulfurizing iron pre-treatment-converter-LF-RH-soft blow-Ca processing-soft blow-cast.
The RH processing finishes the back molten steel is decided oxygen, and oxygen level is 15ppm, and molten steel aluminium content is 0.035%, FeO+MnO=1.5%, CaO/Al
2O
3=2.1; Carry out soft blow after the RH refining finishes and handle, the treatment time is controlled at 18min; The argon bottom-blowing flow control is at the 1L/min.t steel, and soft blow is fed Ca after finishing, and molten steel Ca content is controlled at 25ppm, and the molten steel sulphur content is at 10ppm, Ca/S=2.5, and the argon bottom-blowing flow is at the 2L/min.t steel in the Ca treating processes; The Ca processing finishes the back and continues soft blow, and the time is controlled at 5min, and the soft blow flow is at the 1.2L/min.t steel.Inclusion grade after the processing sees Table 1
Table 1D class and Ds type impurity grade
Embodiment 2:
The smelting of steel of certain deck of boat, adopting process route: desulfurizing iron pre-treatment-converter-LF-soft blow-Ca processing-soft blow-cast.
The RH processing finishes the back molten steel is decided oxygen, and oxygen level is 20ppm, and molten steel aluminium content is 0.030%, FeO+MnO=2.1%, CaO/Al
2O
3=2.4; Carrying out soft blow after the RH refining finishes handles, treatment time is controlled at the flow control of 12min argon bottom-blowing at the 1L/min.t steel, soft blow is fed Ca after finishing, molten steel Ca content is controlled at 18ppm, the molten steel sulphur content is at 20ppm, Ca/S=0.9, the argon bottom-blowing flow is at the 1.8L/min.t steel in the Ca treating processes; The Ca processing finishes the back and continues soft blow, and the time is controlled at 5min, and the soft blow flow is at the 1.0L/min.t steel.Inclusion grade after the processing sees Table 2
Table 2D class and Ds type impurity grade
Claims (1)
1. a reduction contains the calcium treating method of aluminum steel D class and Ds type impurity size, it is characterized in that:
(1) the molten steel oxygen activity was controlled in the 25ppm after refining finished, and molten steel aluminium content (mass percent, down together) is between 0.005%-0.060%; Top slag FeO+MnO content is less than 5%, CaO/Al
2O
3=1.2-3.0;
(2) refining is carried out soft blow after finishing, and the soft blow flow is lower than 2L/min.t, and the soft blow time is controlled at 5min-20min, carrying out calcium after soft blow finishes handles, molten steel Ca content is controlled at 5ppm-30ppm, and Ca/S is controlled between the 0.1-6.0, and the bottom blowing flow was lower than the 5L/min.t steel when calcium was handled;
(3) the calcium processing is carried out soft blow after finishing, and inclusion modification is handled, and the soft blow time is controlled in the 20min, and the bottom blowing flow control is in the 2L/min.t steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010259957XA CN101906502A (en) | 2010-08-23 | 2010-08-23 | Calcium treating method for reducing size of D and Ds type of inclusions containing aluminum steel |
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| CN201010259957XA CN101906502A (en) | 2010-08-23 | 2010-08-23 | Calcium treating method for reducing size of D and Ds type of inclusions containing aluminum steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506212A (en) * | 2015-12-23 | 2016-04-20 | 首钢总公司 | High-aluminum complex-phase steel and smelting method thereof |
| CN107541580A (en) * | 2017-08-25 | 2018-01-05 | 武汉钢铁有限公司 | The inclusion control method of Hot Rolling Automobile steel is smelted in CSP producing lines |
| CN110293219A (en) * | 2019-06-28 | 2019-10-01 | 中天钢铁集团有限公司 | A kind of method of large scale calcium-aluminate field trash in reduction steel |
| CN111172467A (en) * | 2020-01-07 | 2020-05-19 | 马鞍山钢铁股份有限公司 | Medium-high carbon steel with high fracture toughness |
| CN112921147A (en) * | 2021-01-21 | 2021-06-08 | 北京科技大学 | CaS precipitation inhibition method in heat treatment process of aluminum deoxidized calcium treated steel |
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| JP2001342512A (en) * | 2000-06-05 | 2001-12-14 | Sanyo Special Steel Co Ltd | Highly clean steel and production method |
| JP2002105527A (en) * | 2000-09-26 | 2002-04-10 | Kawasaki Steel Corp | Method for producing high cleanliness steel |
| CN101020940A (en) * | 2007-03-28 | 2007-08-22 | 北京科技大学 | Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel |
| CN101519710A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Method for controlling non-metallic impurities in structural alloy steel |
-
2010
- 2010-08-23 CN CN201010259957XA patent/CN101906502A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001342512A (en) * | 2000-06-05 | 2001-12-14 | Sanyo Special Steel Co Ltd | Highly clean steel and production method |
| JP2002105527A (en) * | 2000-09-26 | 2002-04-10 | Kawasaki Steel Corp | Method for producing high cleanliness steel |
| CN101020940A (en) * | 2007-03-28 | 2007-08-22 | 北京科技大学 | Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel |
| CN101519710A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Method for controlling non-metallic impurities in structural alloy steel |
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| Title |
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| 《第七届（2009）中国钢铁年会论文集（上）》 20091231 王文军等 钢包软吹氩对钢中非金属夹杂物去除效果研究 454-458 1 , 2 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506212A (en) * | 2015-12-23 | 2016-04-20 | 首钢总公司 | High-aluminum complex-phase steel and smelting method thereof |
| CN105506212B (en) * | 2015-12-23 | 2018-03-06 | 首钢总公司 | A kind of high alumina Multiphase Steel and its smelting process |
| CN107541580A (en) * | 2017-08-25 | 2018-01-05 | 武汉钢铁有限公司 | The inclusion control method of Hot Rolling Automobile steel is smelted in CSP producing lines |
| CN110293219A (en) * | 2019-06-28 | 2019-10-01 | 中天钢铁集团有限公司 | A kind of method of large scale calcium-aluminate field trash in reduction steel |
| CN111172467A (en) * | 2020-01-07 | 2020-05-19 | 马鞍山钢铁股份有限公司 | Medium-high carbon steel with high fracture toughness |
| CN111172467B (en) * | 2020-01-07 | 2021-04-27 | 马鞍山钢铁股份有限公司 | Medium-high carbon steel with high fracture toughness |
| CN112921147A (en) * | 2021-01-21 | 2021-06-08 | 北京科技大学 | CaS precipitation inhibition method in heat treatment process of aluminum deoxidized calcium treated steel |
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Open date: 20101208 |