CN104232830A - Method for smelting ultralow-phosphor steel at low temperature in converter - Google Patents
Method for smelting ultralow-phosphor steel at low temperature in converter Download PDFInfo
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- CN104232830A CN104232830A CN201410432652.2A CN201410432652A CN104232830A CN 104232830 A CN104232830 A CN 104232830A CN 201410432652 A CN201410432652 A CN 201410432652A CN 104232830 A CN104232830 A CN 104232830A
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Abstract
The invention discloses a method for smelting ultralow-phosphor steel at a low temperature in a converter. According to the method, ultralow-phosphor steel smelting is carried out in a 35t top-blown converter under the following conditions: use of molten iron is 32-33t, use of waste steel is 2.5-3t, a flow rate of working oxygen gas of an oxygen lance is 6500-7800Nm<3>/h, and the molten iron contains 0.120-0.150% of [P]. The method specifically comprises the following operation steps: 1) an efficient dephosphorizing step; 2) a step of deslagging and shaking the converter; 3) a quick heating step; and 4) a tapping step adopting a steel retaining mode, wherein amount of retained steel is 1t, and the content of [P] in a steel ladle is not greater than 0.0050% after steel tapping. The method has the beneficial effects as follows: firstly, ultralow-phosphor steel smelting is completed in a single converter, and compared with a duplex process, the method is simple in process route, reasonable in control over a smelting period, strong in operability and easy to control; and secondly, the method is low in production cost, small in steel loss and capable of completing ultralow-phosphor smelting only by virtue of a low temperature and double slag process.
Description
Technical field
The present invention relates to a kind of method of converter low temperature smelting ultra-low phosphoretic steel, belong to technical field of steel production.
Background technology
In recent years, the production technology of Clean Steel, ultra-clean steel obtains and develops rapidly, adopting new technology, particularly phosphorus, sulphur content are the main contents of Clean Steel Study on Smelting Process to the content reducing impurity element in steel as far as possible, phosphorus is the harmful element in steel, easily at grain boundary segregation, cause low temperature brittleness and the temper brittleness of steel.The requirement of high-duty cast steel to phosphorus amount is more and more stricter, particularly for Cryogenic Steel, marine steel, anti-hydrogen induced cracking steel (being used as the heavy rail of long-term out-of-bounds operation, Sweet natural gas, petroleum transportation pipeline and petroleum refining unit etc.), require [P] < 0.010% even 0.005%.Ultra-low phosphoretic steel refers generally to [P]≤50 × 10 in steel
-6steel, smelting ultra-low phosphoretic steel will start with from the links of process for making (dephosphorization, tapping process liquid steel dephosphorization in liquid iron pretreatment dephosphorizing, Converter, prevent rephosphorization of tapping), reduces the phosphorus content in steel as far as possible.At present, the method that converter smelting realizes ultra-low phosphoretic steel comparative maturity is two block converter integrations of operation (i.e. duplex practice), but many steel-making enterprises adopt traditional stove machine match pattern, as according to double-united gear oil pump ultra-low phosphoretic steel, steelworks integral production enterprise schema can be upset, and duplex practice adds and pours in down a chimney number of times, temperature drop and iron loss are all larger.Playing converter deep dephosphorization potentiality, is many targets that cannot realize the steel-making enterprise Technology tackling key problem of double-united gear oil pump ultra-low phosphoretic steel.
More to the report of the technical study of ultra-low phosphoretic steel both at home and abroad, such as, Chou Shengtao etc. disclose a kind of ultra-low phosphoretic steel smelting process (application number: CN201210258353.2), the method adopts two slag and remaining slag operation technique to smelt and obtains ultra-low phosphoretic steel, but the method is to description steel-making concrete operations not having dephosphorizing method.Yellow one new etc. discloses " a kind of smelting process for producing ultra-low phosphorous steel by converter " (application number: CN201010266559.0), the method adopt repeatedly deslagging and control temperature low-phosphorous to realize, there is the problem of poor operability.Yu Zhixiang etc. disclose a kind of method (application number: CN02115419.8) of producing the control phosphorus of ultra-low phosphoretic steel, and the method lays particular emphasis on and controls rephosphorization to the exploitation of dephosphorizing agent and steel-making later process.Domestic and international many articles, patent etc. propose converter dephosphorization method in addition, it is all theoretical and thinking aspect, there is no clearly feasible steel making operation method, how to realize converter deep dephosphorization by the control of effective rifle position and rational oxygen rifle flow of arranging in pairs or groups, reasonably smelting flux consumption about converter, substantially there is no workable description.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of converter low temperature smelting ultra-low phosphoretic steel.
For solving the problems of the technologies described above, the method of the top blown converter low temperature smelting ultra-low phosphoretic steel of the present invention's design, two slag is made by adopting omnidistance low temperature smelting and smelting process, the concentrations by weight of smelting endpoint P is controlled for [P]≤0.004%, tapping then adopts stays the mode of steel thoroughly to stop slag, effectively inhibit tapping rephosphorization, ladle P≤0.0050% after tapping, thus realize the ultralow phosphorus smelting of converter.
The smelting condition of the inventive method is: carry out ultra-low phosphoretic steel smelting at 35t top blown converter, molten iron 32 ~ 33t, steel scrap 2.5 ~ 3t, and oxygen rifle work oxygen flow is 6500 ~ 7800Nm
3/ h, [P] 0.120 ~ 0.150% in molten iron, its concrete operations are:
1) the high efficiency dephosphorating phase (low for oxygen quenching decarburization intensification): adopt low oxygen supply intensity, oxygen blast flow is 6500 ~ 7000Nm
3/ h; Open and blow in 1min, blowing rifle position 800 ~ 900mm, main task is for heating up and melting steel scrap; In 1 ~ 4min, divide 2 ~ 4 batches to add lime and amount to 1500Kg and iron ore total 500Kg, rifle position is carried to 1100 ~ 1200mm simultaneously; In 4 ~ 7min, rifle position is carried to 1200 ~ 1300mm, and 2 ~ 4 add iron ore total 500Kg in batches; During 7min, the thermometric of falling stove, sampling; At the end of the high efficiency dephosphorating phase, it is 1450 ~ 1480 DEG C that temperature controls, and [C] controls is 1.70 ~ 2.00%, and [P] controls is 0.025 ~ 0.035%;
2) the deslagging grate phase: after removing the 1/3-1/2 of slag total amount, lifting stove to body of heater departs within the scope of petticoat pipe medullary ray ± 30 °, after slow front and back grate 1min, body of heater is shaken and is back to zero-bit, the object of front and back grate for prevent from slag from tying sticking together and under causing secondary rifle misfire;
3) be rapidly heated the phase: open and blow, oxygen flow 7600 ~ 7800Nm
3/ h, blowing rifle position 700 ~ 900mm, adds lime 600 ~ 800kg, magnesium ball 300kg, iron ore 700kg; Fall stove after blowing 4min, the control of falling furnace temperature is 1530 ~ 1550 DEG C, stove [C] 0.060 ~ 0.090%, stove [P]≤0.008%, taps after point blows 30 ~ 50s, tapping temperature 1550 ~ 1570 DEG C, tapping [C]≤0.040%, tapping [P]≤0.0040%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization, stays steel amount to be 1t, [P]≤0.0050% in ladle after tapping;
[TFe]>=55% of described iron ore, [SiO
2]≤15%, impurity element [P], [S]≤0.10%, described [P], [C], [S], [TFe] and [SiO
2] be respectively P, C, S, TFe and SiO
2weight percent content.
The present invention has following beneficial effect:
1) the present invention completes ultra-low phosphoretic steel in single seat converter and smelts, and contrast that operational path is simple, smelting cycle controls reasonable, workable with double-united gear oil pump ultra-low phosphoretic steel, is easy to control.
2) production cost of the present invention is low, and steel damages little, only relies on low temperature and two slag to complete ultralow phosphorus and smelts.
Embodiment
Below in conjunction with embodiment, the present invention is described in more detail.
The method of converter low temperature smelting ultra-low phosphoretic steel of the present invention, its smelting condition is: carry out ultra-low phosphoretic steel smelting at 35t top blown converter, molten iron 32 ~ 33t, steel scrap 2.5 ~ 3t, and oxygen rifle work oxygen flow is 6500 ~ 7800Nm
3/ h, [P] 0.120 ~ 0.150% in molten iron, concrete operation step is:
1) the high efficiency dephosphorating phase (low for oxygen quenching decarburization intensification): the high efficiency dephosphorating phase adopts low oxygen supply intensity, and oxygen blast flow is 6500 ~ 7000Nm
3/ h; Open and blow in 1min, blowing rifle position 800 ~ 900mm, main task is for heating up and melting steel scrap; In 1 ~ 4min, divide 2 ~ 4 batches to add lime and amount to 1500Kg and iron ore total 500Kg, rifle position is carried to 1100 ~ 1200mm simultaneously; In 4 ~ 7min, rifle position is carried to 1200 ~ 1300mm, and 2 ~ 4 add iron ore total 500Kg in batches, slow down temperature rise rate and then reduce decarbonization rate; During 7min, the thermometric of falling stove, sampling; At the end of the high efficiency dephosphorating phase, it is 1450 ~ 1480 DEG C that temperature controls, and [C] controls is 1.70 ~ 2.00%, and [P] controls is 0.025 ~ 0.035%;
2) the deslagging grate phase: after removing the 1/3-1/2 of slag total amount, lifting stove to body of heater departs within the scope of petticoat pipe medullary ray ± 30 °, after slow front and back grate 1min, body of heater is shaken and is back to zero-bit, the object of front and back grate for prevent from slag from tying sticking together and under causing secondary rifle misfire;
3) be rapidly heated the phase: open and blow, oxygen flow 7600 ~ 7800Nm
3/ h, blowing rifle position 700 ~ 900mm, the quantity of slag adds lime 600 ~ 800kg, magnesium ball 300kg, iron ore 700kg; Fall stove after blowing 4min, the control of falling furnace temperature is 1530 ~ 1550 DEG C, stove [C] 0.060 ~ 0.090%, stove [P]≤0.008%, taps after point blows 30 ~ 50s, tapping temperature 1550 ~ 1570 DEG C, tapping [C]≤0.040%, tapping [P]≤0.0040%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization, stays steel amount to be 1t, ladle [P]≤0.0050% after tapping;
[TFe]>=55% of described iron ore, [SiO
2]≤15%, impurity element [P], [S]≤0.10%, described [P], [C], [S], [TFe] and [SiO
2] be respectively P, C, S, TFe and SiO
2weight percent content.
Embodiment 1
1) the high efficiency dephosphorating phase (low for oxygen quenching decarburization intensification): adopt low oxygen supply intensity, oxygen blast flow 6500Nm
3/ h; Open and blow in 1min, blowing rifle position 800mm, main task is for heating up and melting steel scrap; During blowing 1 ~ 4min, divide 3 batches to add lime and amount to 1500Kg and iron ore total 500Kg, rifle position is carried to 1100mm simultaneously; During 4 ~ 7min, rifle position is carried to 1200mm, and points 3 batches add iron ore and amount to 500Kg and slow down temperature rise rate and then reduce decarbonization rate; The thermometric of falling stove, sampling after 7min, in earlier stage end temp 1450 DEG C.Early stage terminates [C] 2.00%, [P] 0.035%;
2) the deslagging grate phase: after removing 35% slag, lift stove to body of heater and depart within the scope of petticoat pipe medullary ray ± 30 °, after grate 1min, body of heater is shaken slowly and be back to zero-bit, the object of front and back grate for prevent from slag from tying sticking together and under causing secondary rifle misfire;
3) be rapidly heated the phase: open and blow, oxygen flow 7600Nm
3/ h, blowing rifle position 700mm, adds lime 600kg, magnesium ball 300kg, iron ore 700kg.Blowing 4min falls stove, falls furnace temperature 1530 DEG C, falls stove [C] 0.080%, falls stove [P] 0.009%, taps after point blows 30s, tapping temperature 1550 DEG C, tapping [C] 0.040%, tapping [P] 0.0040%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization (staying steel amount 1t), ladle [P] 0.0050% after tapping.
Embodiment 2
1) the high efficiency dephosphorating phase (low for oxygen quenching decarburization intensification): adopt low oxygen supply intensity, oxygen blast flow 6600Nm
3/ h; Open and blow in 1min, blowing rifle position 820mm, main task is for heating up and melting steel scrap; 1 ~ 4min divides 3 batches to add lime total 1500Kg and iron ore amounts to 500Kg, carries to 1120mm by rifle position simultaneously; 4 ~ 7min rifle position is carried to 1220mm, and points 3 batches add iron ore and amount to 500Kg and slow down temperature rise rate and then reduce decarbonization rate, the 7min thermometric of falling stove, sampling, early stage end temp 1460 DEG C.Early stage terminates [C] 2.00%, [P] 0.033%;
2) the deslagging grate phase: lift stove to body of heater after removing 40% slag and to depart within the scope of petticoat pipe medullary ray ± 30 ° after grate 1min, body of heater to be shaken slowly and be back to zero-bit, the object of front and back grate for prevent from slag from tying sticking together and under causing secondary rifle misfire;
3) be rapidly heated the phase: open and blow, oxygen flow 7650Nm
3/ h, blowing rifle position 750mm, adds lime 650kg, magnesium ball 300kg, iron ore 700kg.Blowing 4min falls stove, falls furnace temperature 1535 DEG C, falls stove [C] 0.085%, falls stove [P] 0.0078%, taps after point blows 35s, tapping temperature 1555 DEG C, tapping [C] 0.038%, tapping [P] 0.0038%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization (staying steel amount 1t), ladle [P]≤0.0048% after tapping.
Embodiment 3
1) the high efficiency dephosphorating phase (low for oxygen quenching decarburization intensification): adopt low oxygen supply intensity, oxygen blast flow 6700Nm
3/ h; Open and blow blowing rifle position 840mm in 1min, main task is for heating up and melting steel scrap; 1 ~ 4min divides 3 batches to add lime total 1500Kg and iron ore amounts to 500Kg, carries to 1140mm by rifle position simultaneously; 4 ~ 7min rifle position is carried to 1240mm, and points 3 batches add iron ore and amount to 500Kg and slow down temperature rise rate and then reduce decarbonization rate, the 7min thermometric of falling stove, sampling, early stage end temp 1465 DEG C.Early stage terminates [C] 1.80%, [P] 0.030%;
2) the deslagging grate phase: lift stove to body of heater after removing 45% slag and to depart within the scope of petticoat pipe medullary ray ± 30 ° after grate 1min, body of heater to be shaken slowly and be back to zero-bit, the object of front and back grate for prevent from slag from tying sticking together and under causing secondary rifle misfire;
3) be rapidly heated the phase: open and blow, oxygen flow 7700Nm
3/ h, blowing rifle position 800mm, adds lime 700kg, magnesium ball 300kg, iron ore 700kg.Blowing 4min falls stove, falls furnace temperature 1540 DEG C, falls stove [C] 0.080%, falls stove [P]≤0.0075%, taps after point blows 40s, tapping temperature 1560 DEG C, tapping [C] 0.036%, tapping [P] 0.0036%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization (staying steel amount 1t), ladle [P]≤0.0046% after tapping.
Embodiment 4
1) the high efficiency dephosphorating phase (low for oxygen quenching decarburization intensification): adopt low oxygen supply intensity, oxygen blast flow 6900Nm
3/ h; Open and blow blowing rifle position 860mm in 1min, main task is for heating up and melting steel scrap; 1 ~ 4min divides 3 batches to add lime total 1500Kg and iron ore amounts to 500Kg, carries to 1160mm by rifle position simultaneously; 4 ~ 7min rifle position is carried to 1260mm, and points 3 batches add iron ore and amount to 500Kg and slow down temperature rise rate and then reduce decarbonization rate, the 7min thermometric of falling stove, sampling, early stage end temp 1470 DEG C.Early stage terminates [C] 1.75%, [P] 0.028%;
2) the deslagging grate phase: lift stove to body of heater after removing 40% slag and to depart within the scope of petticoat pipe medullary ray ± 30 ° after grate 1min, body of heater to be shaken slowly and be back to zero-bit, the object of front and back grate for prevent from slag from tying sticking together and under causing secondary rifle misfire;
3) be rapidly heated the phase: open and blow, oxygen flow 7750Nm
3/ h, blowing rifle position 850mm, adds lime 750kg, magnesium ball 300kg, iron ore 700kg.Blowing 4min falls stove, falls furnace temperature 1545 DEG C, falls stove [C] 0.075%, falls stove [P] 0.075%, taps after point blows 45s, tapping temperature 1565 DEG C, tapping [C] 0.034%, tapping [P]≤0.035%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization (staying steel amount 1t), ladle [P] 0.0045% after tapping.
Embodiment 5
1) the high efficiency dephosphorating phase (low for oxygen quenching decarburization intensification): adopt low oxygen supply intensity, oxygen blast flow 7000Nm
3/ h; Open and blow blowing rifle position 900mm in 1min, main task is for heating up and melting steel scrap; 1 ~ 4min divides 3 batches to add lime total 1500Kg and iron ore amounts to 500Kg, carries to 1200mm by rifle position simultaneously; 4 ~ 7min rifle position is carried to 1300mm, and points 3 batches add iron ore 500Kg and slow down temperature rise rate and then reduce decarbonization rate, the 7min thermometric of falling stove, sampling, early stage end temp 1480 DEG C.Early stage terminates [C] 1.70%, [P] 0.025%;
2) the deslagging grate phase: lift stove to body of heater after removing 40% slag and to depart within the scope of petticoat pipe medullary ray ± 30 ° after grate 1min, body of heater to be shaken slowly and be back to zero-bit, the object of front and back grate for prevent from slag from tying sticking together and under causing secondary rifle misfire;
3) be rapidly heated the phase: open and blow, oxygen flow 7800Nm
3/ h, blowing rifle position 900mm, adds lime 800kg, magnesium ball 300kg, iron ore 700kg.Blowing 4min falls stove, falls furnace temperature 1550 DEG C, falls stove [C] 0.06%, falls stove [P]≤0.008%, taps after point blows 50s, tapping temperature 1570 DEG C, tapping [C] 0.030%, tapping [P]≤0.0030%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization (staying steel amount 1t), ladle [P]≤0.0040% after tapping.
Tapping [P], the content of ladle [P] and the low-sulfur steel smelting process analog value of LF stove routine in embodiment 1 ~ 5 are contrasted, the results are shown in Table 1:
Tapping [P], the content of ladle [P] and the Low-phosphorus Steel smelting process analog value of LF stove routine in table 1 embodiment 1 ~ 5
| Tupe | Tapping [P], % | Ladle [P], % |
| Embodiment 1 | 0.0040 | 0.0050 |
| Embodiment 2 | 0.0038 | 0.0048 |
| Embodiment 3 | 0.0036 | 0.0046 |
| Embodiment 4 | 0.0035 | 0.0045 |
| Embodiment 5 | 0.0030 | 0.0040 |
| Conventional smelting process | ≥0.010 | ≥0.013 |
After interpretation of result to embodiment 1 ~ 5, can find: adopt the present invention converter can be set off [P] control within 0.0050%.And produce not according to present method, adopt conventional smelting process, converter departures [P] >=0.013%.
Claims (1)
1. a method for converter low temperature smelting ultra-low phosphoretic steel, is characterized in that: the smelting condition of the method is: carry out ultra-low phosphoretic steel smelting at 35t top blown converter, molten iron 32 ~ 33t, steel scrap 2.5 ~ 3t, and oxygen rifle work oxygen flow is 6500 ~ 7800Nm
3/ h, [P] 0.120 ~ 0.150% in molten iron, concrete operation step is:
1) the high efficiency dephosphorating phase: adopt low oxygen supply intensity, oxygen blast flow is 6500 ~ 7000Nm
3/ h; Open and blow in 1min, blowing rifle position 800 ~ 900mm; In 1 ~ 4min, divide 2 ~ 4 batches to add lime and amount to 1500Kg and iron ore total 500Kg, rifle position is carried to 1100 ~ 1200mm simultaneously; In 4 ~ 7min, rifle position is carried to 1200 ~ 1300mm, and 2 ~ 4 add iron ore total 500Kg in batches, slow down temperature rise rate and then reduce decarbonization rate; During 7min, the thermometric of falling stove, sampling; At the end of the high efficiency dephosphorating phase, it is 1450 ~ 1480 DEG C that temperature controls, and [C] controls is 1.70 ~ 2.00%, and [P] controls is 0.025 ~ 0.035%;
2) the deslagging grate phase: after removing the 1/3-1/2 of slag total amount, lift stove to body of heater and depart within the scope of petticoat pipe medullary ray ± 30 °, after grate 1min, body of heater is shaken slowly and be back to zero-bit;
3) be rapidly heated the phase: open and blow, oxygen flow 7600 ~ 7800Nm
3/ h, blowing rifle position 700 ~ 900mm, adds lime 600 ~ 800kg, magnesium ball 300kg, iron ore 700kg; Fall stove after blowing 4min, the control of falling furnace temperature is 1530 ~ 1550 DEG C, stove [C] 0.060 ~ 0.090%, stove [P]≤0.008%, taps after point blows 30-50s, tapping temperature 1550 ~ 1570 DEG C, tapping [C]≤0.040%, tapping [P]≤0.0040%;
4) tapping steel: wear slag retaining cap tapping, adopts the mode staying steel to tap to prevent tapping process slag rephosphorization, stays steel amount to be 1t, ladle [P]≤0.0050% after tapping;
[TFe]>=55% of described iron ore, [SiO
2]≤15%, impurity element [P], [S]≤0.10%, described [P], [C], [S], [TFe] and [SiO
2] be respectively P, C, S, TFe and SiO
2weight percent content.
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| CN104911294A (en) * | 2015-06-23 | 2015-09-16 | 武汉钢铁(集团)公司 | Method for smelting high-carbon and low-phosphorus steel by utilizing converter at low temperature |
| CN105112599A (en) * | 2015-08-31 | 2015-12-02 | 桂林昌鑫机械制造有限公司 | Method for smelting ultra-low phosphorus steel |
| CN106319136A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Converter smelting method for ultra-low-phosphorus steel |
| CN106636531A (en) * | 2016-11-16 | 2017-05-10 | 南京钢铁股份有限公司 | Double-slag process for smelting ultralow-phosphorus and low-carbon steel in combined-blown converter |
| CN108950127A (en) * | 2018-07-27 | 2018-12-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of smelting process of Low-phosphorus Steel |
| CN109022670A (en) * | 2018-07-20 | 2018-12-18 | 首钢集团有限公司 | A kind of converter steel making method producing ultra-low phosphoretic steel |
| CN109913612A (en) * | 2019-03-06 | 2019-06-21 | 鞍钢股份有限公司 | A kind of control method of the environmentally protective smelting of converter |
| CN113444855A (en) * | 2020-03-27 | 2021-09-28 | 上海梅山钢铁股份有限公司 | Smelting method utilizing residual steel and residual slag in steel ladle |
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| CN104911294A (en) * | 2015-06-23 | 2015-09-16 | 武汉钢铁(集团)公司 | Method for smelting high-carbon and low-phosphorus steel by utilizing converter at low temperature |
| CN106319136A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Converter smelting method for ultra-low-phosphorus steel |
| CN105112599A (en) * | 2015-08-31 | 2015-12-02 | 桂林昌鑫机械制造有限公司 | Method for smelting ultra-low phosphorus steel |
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| CN105112599B (en) * | 2015-08-31 | 2018-02-27 | 浙江博盛不锈钢制造有限公司 | A kind of ultra-low phosphoretic steel smelting process |
| CN106636531A (en) * | 2016-11-16 | 2017-05-10 | 南京钢铁股份有限公司 | Double-slag process for smelting ultralow-phosphorus and low-carbon steel in combined-blown converter |
| CN106636531B (en) * | 2016-11-16 | 2018-06-19 | 南京钢铁股份有限公司 | A kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel |
| CN109022670A (en) * | 2018-07-20 | 2018-12-18 | 首钢集团有限公司 | A kind of converter steel making method producing ultra-low phosphoretic steel |
| CN108950127A (en) * | 2018-07-27 | 2018-12-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of smelting process of Low-phosphorus Steel |
| CN109913612A (en) * | 2019-03-06 | 2019-06-21 | 鞍钢股份有限公司 | A kind of control method of the environmentally protective smelting of converter |
| CN113444855A (en) * | 2020-03-27 | 2021-09-28 | 上海梅山钢铁股份有限公司 | Smelting method utilizing residual steel and residual slag in steel ladle |
| CN113444855B (en) * | 2020-03-27 | 2022-06-14 | 上海梅山钢铁股份有限公司 | Smelting method utilizing residual steel and residual slag in steel ladle |
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