CN103397146A - Production method of pipeline steel - Google Patents
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Abstract
The invention provides a production method of pipeline steel. The production method comprises following steps: molten iron in a foundry ladle is subjected to slagging treatment, to desulphurization after addition of a desulfurizer, and then to slagging treatment for a second time; the molten iron is added into a dephosphorization furnace, steel scraps and slag materials are added into the molten iron, the mixture is subjected to converting decarburization treatment so as to obtain molten steel, and then the molten steel is added into the dephosphorization furnace; slag materials are added into the molten steel in the dephosphorization furnace, the mixture is subjected to converting decarburization treatment so as to obtain decarburized molten steel; the decarburized molten steel is subjected to steel tapping treatment, and the molten steel is added into a steel ladle; the molten steel in the steel ladle is subjected to RH refining; and then the refined molten steel is subjected to teeming treatment by using a continuous caster. According to the production method of pipeline steel, ' three removal' pre-treatment technologies on full molten iron are employed, secondary refining desulphurization is not needed, low-sulfur molten steel with S less than 0.006% can be producted by raw material controlling and converter operation, production cost is low, and cleanliness of products is high.
Description
Technical field
The present invention relates to steelmaking technical field, particularly a kind of production method of pipe line steel.
Background technology
Along with the progress of society, market strengthens day by day to the requirement of steel cleanliness factor and cost.High-cleanness, high, low cost are the major technique directions of 21 century steel products Quality Developing, in order to improve the various performances of steel, the reenlist life-span, improve intensity, require foreign matter content (N, O, H) and the inclusion total amount of steel more low better, and, in order to improve enterprise competitiveness, require steel product cost more low better.
Traditional pipe line steel production technique is to adopt full dose desulfurizing iron pre-treatment → conventional converter smelting → LF external refining (+RH) technological process, converter smelting treatment scheme in traditional pipe line steel Production Flow Chart is long, same converter need take into account the task of taking off P and taking off C, efficiency is lower and because the fluctuation of production technique also easily causes the quality of molten steel unstable, and LF external refining purification molten steel, main purpose is in order to heat up, take off S and alloying, but it is serious that the LF external refining easily causes molten steel to increase N, and Molten Steel Cleanliness reduces; And the energy consumption of traditional pipe line steel production technique is high, cost is high, CO
2Quantity discharged is high.
Summary of the invention
Technical problem to be solved by this invention is to provide the production method of the high pipe line steel of a kind of cleanliness factor.
For solving the problems of the technologies described above, the invention provides a kind of production method of pipe line steel, comprise the steps:
1) molten iron in hot metal ladle is skimmed successively processing, add that sweetening agent KR desulfurization is processed, the processing of again skimming, then molten iron is blended into dephosphorization converter;
2) add steel scrap and slag charge in the molten iron of described dephosphorization converter, the dephosphorization treatment that blows, then be blended into the decarburization converter with the gained molten steel;
3) molten steel to described decarburization converter adds slag charge, and the carbonization treatment that blows obtains the decarburization molten steel;
The decarburization molten steel that 4) will the obtain processing of tapping, then pour molten steel in ladle into;
5) molten steel in described ladle is carried out the RH refining;
6) molten steel after the RH refining is carried out the continuous caster cast.
Further, the sweetening agent described in step 1) is the mixture of lime and fluorite, and the mass ratio of described lime and fluorite is 10:1, and the add-on of described sweetening agent is 7-9kg/t iron, the sulphur content S in described desulfurized molten iron＜0.001%; The described rate of skimming of again skimming and processing〉95%.
The mass percent of the steel scrap that adds in molten iron further, step 2) is 7～10%, the sulphur content S in described steel scrap＜0.005%; Described slag charge is lime, light dolomite, agglomerate and fluorite, and described slag charge add-on is lime 14-17kg/t iron, light dolomite 4-6kg/t iron, agglomerate＜15kg/t iron, fluorite 2-3kg/t iron; Sulphur content S＜0.030% in described lime, sulphur content S＜0.010% in light dolomite, sulphur content S＜0.040% in agglomerate, sulphur content S＜0.020% in fluorite.
Further, the target basicity that step 2), in dephosphorization converter, molten iron blows is pressed 1.8-2.7 and is controlled; Primary period rifle position 2.7m, kept 2～3 minutes, reduces gradually afterwards the rifle position, blow end point rifle position 2-2.2m; In described dephosphorization converter, terminal temperature is pressed 1320-1380 ℃ of control; Blowing gained molten steel sulphur content S＜0.005%.
Further, slag charge described in step 3) is agglomerate, lime, light dolomite and fluorite, and the add-on of described slag charge is agglomerate＜5kg/t steel, lime 18～22kg/t steel, light dolomite 10-12kg/t steel, fluorite 2-4kg/t steel; Sulphur content S＜0.030% in described lime, sulphur content S＜0.010% in light dolomite, sulphur content S＜0.040% in agglomerate, sulphur content S＜0.020% in fluorite.
Further, the finishing slag basicity in the converter of decarburization described in step 3) is pressed 3.5-4.5 control; In described decarburization converter, terminal temperature is pressed 1680-1710 ℃ of control, the sulphur content S of described blowing gained molten steel＜0.007%.
Further, the pushing off the slag tapping is adopted in the molten steel of decarburization described in step 4) tapping, first adds the ferro-aluminum deoxidation in described decarburization molten steel tapping treating processes, adds granule lime and fluorite wash heat desulfurization again; Sulphur content S after described decarburized steel grain slag is washed＜0.005%; Tap after complete and add aluminium slag ball at the top of the slag, aluminium slag ball add-on 0.7-1.0kg/t steel, and 3-5 minute is stirred in bottom blowing.
Further, the add-on of described ferro-aluminum changes according to described decarburized steel oxygen content in water, when the decarburized steel oxygen content in water is 600ppm, the ferro-aluminum add-on is the 3.5kg/t steel, and the every increase of decarburized steel oxygen content in water or minimizing 100ppm, the ferro-aluminum add-on is corresponding increase or minimizing 0.5kg/t steel on the basis of 3.5kg/t steel; The add-on of described granule lime is the 7.5-8.5kg/t steel, and the add-on of described fluorite is the 1.8-2.2kg/t steel.
Further, the refining of RH described in step 5) is to adopt the dark vacuum refinement of RH vacuum oven, vacuum tightness≤200Pa, and vacuum processing time 〉=10 minute, alloy and temperature are adjusted complete rear pure cycling time 〉=5min.
Further, the cast of the continuous caster of molten steel described in step 6) is to adopt full argon for protecting pouring, and the superheating temperature of molten steel is controlled at 15-30 ℃.
The production method of a kind of pipe line steel provided by the invention, adopt full dose molten iron " three take off " to process, take off the wash heat of S and tapping process by the converter supplementary material and take off S, need not the LF refining desulfuration, the treatment scheme that converter adds the RH refining is the molten steel of stably manufactured S＜0.006% directly, adopts full dose molten iron " three take off " pretreatment technology, realizes converter less-slag melting,, by hot metal pretreatment and RH refining controlling Molten Steel Cleanliness, reach the target of low cost, high-cleanness, high, high efficiency.
The production method of a kind of pipe line steel provided by the invention has following features:
1, need not the LF refining desulfuration, by molten steel RH vacuum-treat, gas content and inclusion are fully removed.
2, for the production of low-sulfur steel, converter is controlled at S＜0.005% with sulphur, can avoid molten steel recarburization, nitrogen pick-up because the LF desulfurization causes.
3, converter lime total flow is less than 30kg/t, and total quantity of slag, less than 60kg/t, need not simultaneously LF and processes, and changes and walks RH technique, saves approximately 10 yuan/t steel of process costs, has played the effect that reduces costs.
Embodiment
The production method of a kind of pipe line steel that the embodiment of the present invention provides, comprise the steps:
1) molten iron in hot metal ladle is skimmed successively processing, add that sweetening agent KR desulfurization is processed, the processing of again skimming, then molten iron is blended into dephosphorization converter;
2) add steel scrap and slag charge in the molten iron of dephosphorization converter, the dephosphorization treatment that blows, then be blended into the decarburization converter with the gained molten steel;
3) molten steel to the decarburization converter adds slag charge, and the carbonization treatment that blows obtains the decarburization molten steel;
The decarburization molten steel that 4) will the obtain processing of tapping, then pour molten steel in ladle into;
5) molten steel in described ladle is carried out the RH refining;
6) molten steel after the RH refining is carried out the continuous caster cast.
Wherein, the sweetening agent that adds in step 1) is the mixture of lime and fluorite, and the mass ratio of lime and fluorite is 10:1, and the add-on of sweetening agent is 7-9kg/t iron, the sulphur content S in desulfurized molten iron＜0.001%; The rate of skimming of again skimming and processing〉95%.
The mass percent of the steel scrap that adds in molten iron wherein, step 2) is 7～10%, the sulphur content S in steel scrap＜0.005%; Slag charge is high calcium quickened lime, light dolomite, agglomerate and fluorite, and the slag charge add-on is lime 14-17kg/t iron, light dolomite 4-6kg/t iron, agglomerate＜15kg/t iron, fluorite 2-3kg/t iron; Sulphur content S＜0.030% in lime, sulphur content S＜0.010% in light dolomite, sulphur content S＜0.040% in agglomerate, sulphur content S＜0.020% in fluorite.
Wherein, the target basicity that step 2), in dephosphorization converter, molten iron blows is pressed 1.8-2.7 and is controlled; Primary period rifle position 2.7m, kept 2～3 minutes, reduces gradually afterwards the rifle position, blow end point rifle position 2-2.2m; In dephosphorization converter, terminal temperature is pressed 1320-1380 ℃ of control; Blowing gained molten steel sulphur content S＜0.005%.
Wherein, in step 3), slag charge is agglomerate, lime, light dolomite and fluorite, and the add-on of slag charge is agglomerate＜5kg/t steel, lime 18～22kg/t steel, light dolomite 10-12kg/t steel, fluorite 2-4kg/t steel; Sulphur content S＜0.030% in lime, sulphur content S＜0.010% in light dolomite, sulphur content S＜0.040% in agglomerate, sulphur content S＜0.020% in fluorite.
Wherein, in step 3), the finishing slag basicity in the decarburization converter is pressed 3.5-4.5 control; In the decarburization converter, terminal temperature is pressed 1680-1710 ℃ of control; The sulphur content S of blowing gained molten steel＜0.007%.
Wherein, in step 4), the pushing off the slag tapping is adopted in decarburization molten steel tapping, first adds the ferro-aluminum deoxidation in decarburization molten steel tapping treating processes, adds granule lime and fluorite wash heat desulfurization again; Sulphur content S after the decarburized steel grain slag is washed＜0.005%; Tap after complete and add aluminium slag ball at the top of the slag, aluminium slag ball add-on 0.7-1.0kg/t steel, and 3-5 minute is stirred in bottom blowing.
Wherein, the add-on of the ferro-aluminum that adds changes according to gained decarburized steel oxygen content in water, when the decarburized steel oxygen content in water is 600ppm, the ferro-aluminum add-on is the 3.5kg/t steel, and the every increase of decarburized steel oxygen content in water or minimizing 100ppm, the ferro-aluminum add-on is corresponding increase or minimizing 0.5kg/t steel on the basis of 3.5kg/t steel; The add-on of granule lime is the 7.5-8.5kg/t steel, and the add-on of fluorite is the 1.8-2.2kg/t steel.
Wherein, in step 5), the RH refining is to adopt the dark vacuum refinement of RH vacuum oven, vacuum tightness≤200Pa, and vacuum processing time 〉=10 minute, alloy and temperature are adjusted complete rear pure cycling time 〉=5min.
Wherein, in step 6), the cast of the continuous caster of molten steel is to adopt full argon for protecting pouring, and the superheating temperature of molten steel is controlled at 15-30 ℃.
Below in conjunction with embodiment, the production method of a kind of pipe line steel provided by the invention is described in detail.
The production method of a kind of pipe line steel that the embodiment of the present invention provides, produce respectively other pipe line steel of X52 level take 5 embodiment and describe as example:
Step (1): add sweetening agent after molten iron drossing, carrying out the KR desulfurization processes, the sweetening agent add-on is that molten iron per ton adds sweetening agent 7-9kg, the processing of again skimming after desulfurizing iron is disposed, the rate of skimming〉95%, after KR desulfurization processing finished, S in molten iron＜0.001%, then be blended into dephosphorization converter with the gained molten iron.In 5 example examples, the variation of KR desulfurization treating processes molten steel sulfur content and sweetening agent add-on are in Table 1.
Table 1KR desulfurization treating processes molten steel sulfur content changes and the sweetening agent add-on
| Embodiment | S content before KR | The sweetening agent add-on | The KR processing finishes S | The rate of skimming |
| Embodiment 1 | 0.0337% | 7.6kg/t | 0.00005% | 96% |
| Embodiment 2 | 0.0314% | 7.1kg/t | 0.00010% | 98% |
| Embodiment 3 | 0.0355% | 7.8kg/t | 0.00006% | 98% |
| Embodiment 4 | 0.0331% | 7.5kg/t | 0.00008% | 97% |
| Embodiment 5 | 0.0418% | 8.1kg/t | 0.00005% | 98% |
Step (2): add steel scrap in the molten iron of dephosphorization converter, steel scrap uses the low-sulfur steel scrap, and the mass percent that in molten iron, steel scrap adds is 7～10%, S in steel scrap＜0.005%; Then add slag charge, the add-on of slag charge is that molten iron per ton adds respectively lime 14～17kg, light dolomite 4-6kg, agglomerate＜15kg, fluorite 2-3kg, wherein, S in lime＜0.030%, S in light dolomite＜0.010%, S in agglomerate＜0.040%, S in fluorite＜0.020%.The target basicity of dephosphorization converter is controlled according to 1.8-2.7, and Primary period rifle position 2.7m kept 2～3 minutes, reduced gradually afterwards the rifle position, blow end point rifle position 2～2.2m.In dephosphorization converter, terminal temperature is according to 1320-1380 ℃ of control, and the finishing blowing molten steel meets the standard of S＜0.005%, then the gained molten steel is blended into the decarburization converter.
In 5 embodiment, the supplementary material add-on of dephosphorization converter is in Table 2; The sulphur content of the supplementary material that adds in dephosphorization converter in 5 embodiment is in Table 3; In 5 embodiment, the parameter of dephosphorization converter in converting process is in Table 4.
The supplementary material add-on of table 2 dephosphorization converter
| Embodiment | Scrap ratio % | Lime kg/t | Agglomerate kg/t | Light-burned white clouds kg/t | Fluorite kg/t |
| Embodiment 1 | 9 | 14.6 | 12.4 | 4.6 | 2.66 |
| Embodiment 2 | 10 | 15.3 | 12.0 | 5.3 | 2.43 |
| Embodiment 3 | 9 | 14.1 | 12.1 | 4.7 | 2.13 |
| Embodiment 4 | 9 | 15.7 | 13.0 | 4.3 | 2.35 |
| Embodiment 5 | 8 | 14.5 | 13.4 | 4.6 | 2.88 |
Table 3 dephosphorization converter supplementary material S content (mass percent), %
| Embodiment | Steel scrap S | Lime S | Agglomerate S | Light dolomite S | Fluorite S |
| Embodiment 1 | 0.003 | 0.022 | 0.035 | 0.008 | 0.018 |
| Embodiment 2 | 0.002 | 0.022 | 0.035 | 0.008 | 0.018 |
| Embodiment 3 | 0.002 | 0.028 | 0.031 | 0.007 | 0.017 |
| Embodiment 4 | 0.003 | 0.028 | 0.031 | 0.009 | 0.017 |
| Embodiment 5 | 0.004 | 0.021 | 0.031 | 0.009 | 0.017 |
Table 4 dephosphorization converter converting process is controlled parameter
Step (3): add slag charge in the molten steel of decarburization converter, slag charge is self-produced agglomerate, lime, light dolomite and fluorite, and the add-on of slag charge is that molten steel per ton adds respectively self-produced agglomerate＜5kg, lime 18～22kg, light dolomite 10-12kg, fluorite 2-4kg; Wherein, S in lime＜0.030%, S in light dolomite＜0.010%, S in self-produced agglomerate＜0.040%, S in fluorite＜0.020%.The target basicity of decarburization converter is controlled at 4～5, and the decarburization converter is opened and blown high rifle position fast slag, and rifle position 2.7～2.8m, kept 1～2 minute, reduces gradually afterwards the rifle position, terminal rifle position 1.7～1.8m; The time of converting process is about 10 minutes, and decarburization converter finishing slag basicity is controlled according to 3.5-4.5; In the decarburization converter, terminal temperature is according to 1680-1710 ℃ of control, and finishing blowing gained decarburization molten steel meets the standard of S＜0.007%.
In 5 embodiment, the auxiliary material add-on of decarburization converter is as shown in table 5; Decarburization converter supplementary material sulphur content is respectively: steel scrap S is 0.002%, and lime S is 0.025%, and light dolomite S is 0.009%, and agglomerate S is 0.032%, and fluorite S is 0.017%; After starting blowing, oxygen supply intensity is controlled to be 3.11Nm
3/ t.min; In 5 embodiment, the converting process parameter of decarburization converter is controlled as shown in table 6.
Table 5 decarburization converter auxiliary material add-on
| Embodiment | Self-produced agglomerate kg/ | T lime kg/t | Self-produced light-burned white clouds kg/t | Superfine fluorite kg/t |
| Embodiment 1 | 2.6 | 20.2 | 10.6 | 3.7 |
| Embodiment 2 | 4.0 | 20.6 | 10.3 | 3.0 |
| Embodiment 3 | 4.1 | 18.9 | 10.1 | 2.4 |
| Embodiment 4 | 4.8 | 20.3 | 10.6 | 3.6 |
| Embodiment 5 | 3.9 | 19.1 | 10.8 | 2.9 |
Table 6 decarburization is bessemerized process parameter and is controlled
Step (4): the decarburization molten steel that will the obtain processing of tapping, tapping process first add the ferro-aluminum deoxidation, add granule lime and fluorite wash heat desulfurization again; The ferro-aluminum add-on changes according to gained decarburized steel oxygen content in water, when the decarburized steel oxygen content in water is 600ppm, the ferro-aluminum add-on is that steel per ton adds ferro-aluminum 3.5kg, and the every increase of decarburized steel oxygen content in water or reduce 100ppm, ferro-aluminum add-on add on the basis of ferro-aluminum 3.5kg steel per ton correspondingly to increase or reduce the ferro-aluminum of 0.5kg at steel per ton; The add-on of granule lime is that steel per ton adds granule lime 7.5-8.5kg, and the add-on of fluorite is that steel per ton adds fluorite 1.8-2.2kg/t steel.And granule lime and fluorite slag charge add in tapping early stage, add before tapping 2/5, meet the standard of S＜0.006% after molten steel wash heat.
The complete backward top of the slag of tapping adds aluminium slag ball, and the aluminium slag ball add-on is that steel per ton adds aluminium slag ball 0.7-1.0kg, and bottom blowing stirring 3-5 minute, after being disposed, molten steel is poured in ladle.In 5 embodiment, tapping processing related data is shown in Table 7.
Related data is processed in table 7 tapping
Step (5): the molten steel in ladle is transported to the RH vacuum oven carries out the RH refining, the RH vacuum oven adopts dark vacuum-treat, vacuum tightness≤200Pa, vacuum processing time 〉=10 minute, alloy and temperature are adjusted complete rear pure cycling time 〉=5min, and during 5 embodiment produce, RH refining treatment parameter is as shown in table 8.
Table 8RH refining treatment parameter
| Embodiment | Vacuum tightness, | Vacuum processing time, | Pure cycling time, | RH finishes |
| ? | Kpa | min | min | S，% |
| Embodiment 1 | 13 | 28 | 7 | 0.0043 |
| Embodiment 2 | 48 | 28 | 8 | 0.0050 |
| Embodiment 3 | 7 | 24 | 8 | 0.0053 |
| Embodiment 4 | 34 | 24 | 8 | 0.0043 |
| Embodiment 5 | 16 | 27 | 8 | 0.0047 |
Step (6): the molten steel after the RH refining is carried out the continuous caster cast, and the pouring molten steel process adopts full argon for protecting pouring, and molten steel overheat is controlled at 15-30 ℃.The X52 pouring molten steel process control situation of 5 embodiment adopts three tunnel argon for protecting pouring: tundish upper nozzle argon flow amount 3-5NL/min; Stopper argon blowing rate 1-3NL/min; Argon blowing rate 6-8NL/min between plate; Carried out four temperature surveys in the X52 pouring molten steel process of 5 embodiment, average superheating temperature is respectively 18 ℃, 18.5 ℃, 19 ℃ and 20 ℃.
The Molten Steel Cleanliness of other pipe line steel of X52 level that 5 embodiment produce respectively is higher, after being embodied in oxygen, nitrogen, the hydrogen richness of molten steel and being rolled into coiled sheet on inclusion grading situation.T.O, N and the H content of the strand that 5 embodiment obtain are shown in Table 9; The hot-rolled sheet non-metallic inclusion grading of 5 embodiment rollings is as shown in table 10.
Table 9 strand T.O, N and H content
The grading of table 10 hot-rolled sheet non-metallic inclusion
From the strand that table 9 and table 10 provide the content of oxygen, nitrogen, hydrogen and be rolled into coiled sheet after can find out on the inclusion ratings data, T.O, N and the H content of the strand that 5 embodiment obtain are all very low, and the non-metallic inclusion of the hot-rolled sheet of 5 embodiment rollings is also very low.Therefore, the production method of the pipe line steel that the embodiment of the present invention provides, adopt full dose molten iron " three take off " pretreatment technology, need not the secondary refining desulfurization, rely on supplementary material control and converter operation can produce the low-sulfur molten steel of S＜0.006%, not only the production cost of product is low, and it is high to produce the cleanliness factor of the product obtain.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. the production method of a pipe line steel, is characterized in that, comprises the steps:
1) molten iron in hot metal ladle is skimmed successively processing, add that sweetening agent KR desulfurization is processed, the processing of again skimming, then molten iron is blended into dephosphorization converter;
2) add steel scrap and slag charge in the molten iron of described dephosphorization converter, the dephosphorization treatment that blows, then be blended into the decarburization converter with the gained molten steel;
3) molten steel to described decarburization converter adds slag charge, and the carbonization treatment that blows obtains the decarburization molten steel;
The decarburization molten steel that 4) will the obtain processing of tapping, then pour molten steel in ladle into;
5) molten steel in ladle is carried out the RH refining;
6) molten steel after the RH refining is carried out the continuous caster cast.
2. the production method of pipe line steel according to claim 1, it is characterized in that: the sweetening agent described in step 1) is the mixture of lime and fluorite, the mass ratio of described lime and fluorite is 10:1, the add-on of described sweetening agent is 7-9kg/t iron, the sulphur content S in the molten iron after described desulfurization＜0.001%; The described rate of skimming of again skimming and processing〉95%.
3. the production method of pipe line steel according to claim 1, is characterized in that: step 2) described in the mass percent of the steel scrap that adds in molten iron be 7～10%, the sulphur content S in described steel scrap＜0.005%; Described slag charge is lime, light dolomite, agglomerate and fluorite, and described slag charge add-on is lime 14-17kg/t iron, light dolomite 4-6kg/t iron, agglomerate＜15kg/t iron, fluorite 2-3kg/t iron; Sulphur content S＜0.030% in described lime, sulphur content S＜0.010% in described light dolomite, sulphur content S＜0.040% in described agglomerate, sulphur content S＜0.020% in described fluorite.
4. the production method of pipe line steel according to claim 3, is characterized in that: step 2) described in the target basicity of molten iron blowing in dephosphorization converter press 1.8-2.7 control; Primary period rifle position 2.7m, kept 2～3 minutes, reduces gradually afterwards the rifle position, blow end point rifle position 2-2.2m; In described dephosphorization converter, terminal temperature is pressed 1320-1380 ℃ of control; Gained molten steel sulphur content S＜0.005%.
5. the production method of pipe line steel according to claim 1, it is characterized in that: slag charge described in step 3) is agglomerate, lime, light dolomite and fluorite, the add-on of described slag charge is agglomerate＜5kg/t steel, lime 18～22kg/t steel, light dolomite 10-12kg/t steel, fluorite 2-4kg/t steel; Sulphur content S＜0.040% in described agglomerate, sulphur content S＜0.030% in described lime, sulphur content S＜0.010% in described light dolomite, sulphur content S＜0.020% in described fluorite.
6. the production method of pipe line steel according to claim 5 is characterized in that: the finishing slag basicity in the converter of decarburization described in step 3) is pressed 3.5-4.5 and is controlled; In described decarburization converter, terminal temperature is pressed 1680-1710 ℃ of control, the sulphur content S of described decarburization molten steel＜0.007%.
7. the production method of pipe line steel according to claim 1, it is characterized in that: the pushing off the slag tapping is adopted in the molten steel of decarburization described in step 4) tapping, first adds the ferro-aluminum deoxidation in described decarburization molten steel tapping treating processes, adds granule lime and fluorite wash heat desulfurization again; Sulphur content S after described decarburized steel grain slag is washed＜0.005%; Tap after complete and add aluminium slag ball at the top of the slag, aluminium slag ball add-on 0.7-1.0kg/t steel, and 3-5 minute is stirred in bottom blowing.
8. the production method of pipe line steel according to claim 7, it is characterized in that: the add-on of described ferro-aluminum changes according to described decarburized steel oxygen content in water, when the decarburized steel oxygen content in water is 600ppm, the ferro-aluminum add-on is the 3.5kg/t steel, and the every increase of decarburized steel oxygen content in water or minimizing 100ppm, the ferro-aluminum add-on is corresponding increase or minimizing 0.5kg/t steel on the basis of 3.5kg/t steel; The add-on of described granule lime is the 7.5-8.5kg/t steel, and the add-on of described fluorite is the 1.8-2.2kg/t steel.
9. the production method of pipe line steel according to claim 1, it is characterized in that: it is to adopt the dark vacuum refinement of RH vacuum oven that molten steel described in step 5) carries out the RH refining, vacuum tightness≤200Pa, vacuum processing time 〉=10 minute, alloy and temperature are adjusted complete rear pure cycling time 〉=5min.
10. the production method of pipe line steel according to claim 1 is characterized in that: it is to adopt full argon for protecting pouring that molten steel described in step 6) carries out the continuous caster cast, and the superheating temperature of molten steel is controlled at 15-30 ℃.
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| CN103952636A (en) * | 2014-05-20 | 2014-07-30 | 唐山瑞丰钢铁（集团）有限公司 | Production technique of hot-rolled strip steel for cold-rolling hot-galvanizing |
| CN105803148A (en) * | 2016-03-22 | 2016-07-27 | 首钢总公司 | Smelting method for low-sulfur steel |
| CN105821178A (en) * | 2016-03-24 | 2016-08-03 | 首钢总公司 | Smelting method for ultra-low carbon steel |
| CN107760810A (en) * | 2017-09-15 | 2018-03-06 | 首钢京唐钢铁联合有限责任公司 | Production method of pipeline steel |
| CN107868858A (en) * | 2017-10-16 | 2018-04-03 | 首钢京唐钢铁联合有限责任公司 | Production method of low-sulfur low-phosphorus steel |
| CN105865830B (en) * | 2015-01-23 | 2018-06-26 | 鞍钢股份有限公司 | Method for sampling and predicting chemical components of uniformly mixed iron ore |
| CN108300837A (en) * | 2018-02-27 | 2018-07-20 | 首钢京唐钢铁联合有限责任公司 | Steelmaking method |
| CN108396096A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | Method for desulfurizing ultra-low-temperature and ultra-high-sulfur molten iron in converter |
| CN111482566A (en) * | 2020-03-23 | 2020-08-04 | 首钢集团有限公司 | Continuous casting method of aluminum-containing peritectic high-strength automobile steel |
| CN112126737A (en) * | 2019-06-24 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Production method of low-sulfur alloy molten steel |
| CN113293253A (en) * | 2021-04-30 | 2021-08-24 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-cleanliness heat-system variety steel at low cost |
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| CN103952636B (en) * | 2014-05-20 | 2016-08-24 | 唐山瑞丰钢铁（集团）有限公司 | Cold rolling hot dip galvanizing hot-strip production technology |
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| CN105865830B (en) * | 2015-01-23 | 2018-06-26 | 鞍钢股份有限公司 | Method for sampling and predicting chemical components of uniformly mixed iron ore |
| CN105803148A (en) * | 2016-03-22 | 2016-07-27 | 首钢总公司 | Smelting method for low-sulfur steel |
| CN105803148B (en) * | 2016-03-22 | 2017-12-26 | 首钢总公司 | A kind of smelting process of low-sulfur steel |
| CN105821178A (en) * | 2016-03-24 | 2016-08-03 | 首钢总公司 | Smelting method for ultra-low carbon steel |
| CN108396096B (en) * | 2017-02-08 | 2019-09-20 | 鞍钢股份有限公司 | Method for desulfurizing ultra-low-temperature and ultra-high-sulfur molten iron in converter |
| CN108396096A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | Method for desulfurizing ultra-low-temperature and ultra-high-sulfur molten iron in converter |
| CN107760810A (en) * | 2017-09-15 | 2018-03-06 | 首钢京唐钢铁联合有限责任公司 | Production method of pipeline steel |
| CN107868858A (en) * | 2017-10-16 | 2018-04-03 | 首钢京唐钢铁联合有限责任公司 | Production method of low-sulfur low-phosphorus steel |
| CN108300837A (en) * | 2018-02-27 | 2018-07-20 | 首钢京唐钢铁联合有限责任公司 | Steelmaking method |
| CN112126737A (en) * | 2019-06-24 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Production method of low-sulfur alloy molten steel |
| CN112126737B (en) * | 2019-06-24 | 2022-04-15 | 上海梅山钢铁股份有限公司 | Production method of low-sulfur alloy molten steel |
| CN111482566A (en) * | 2020-03-23 | 2020-08-04 | 首钢集团有限公司 | Continuous casting method of aluminum-containing peritectic high-strength automobile steel |
| CN111482566B (en) * | 2020-03-23 | 2021-07-23 | 首钢集团有限公司 | Continuous casting method of aluminum-containing peritectic high-strength automobile steel |
| CN113293253A (en) * | 2021-04-30 | 2021-08-24 | 首钢京唐钢铁联合有限责任公司 | Method for producing high-cleanliness heat-system variety steel at low cost |
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