CN102978511B - Method for producing hot-rolled steel plate for automobile girder steel by low cost - Google Patents
Method for producing hot-rolled steel plate for automobile girder steel by low cost Download PDFInfo
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- CN102978511B CN102978511B CN201210511575.0A CN201210511575A CN102978511B CN 102978511 B CN102978511 B CN 102978511B CN 201210511575 A CN201210511575 A CN 201210511575A CN 102978511 B CN102978511 B CN 102978511B
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Abstract
The invention provides a method for producing a hot-rolled steel plate for automobile girder steel by low cost. Through the innovation of steel-making and steel rolling processes, the problems that the cost of Nb and V micro-alloys in a cast blank for producing a high-strength hot-rolling plate in the steel making process is high, and transverse cracks of a cast blank are difficult to control are solved; and the problems that the returning and the re-crystallization of steel are obvious in a process of rolling the high-strength steel, a controlled rolling and controlled cooling process is difficult to sufficiently exert, the temperature difference of the belt steel in a length direction is greater, the fluctuation of the mechanical property is great, the investment of equipment of the controlled rolling and controlled cooling process is great and the like can be solved. Therefore, the produced product has the advantages of higher strength, ductility and toughness, good welding performance and the like; and the yield strength is 510-580 MPa, the tensile strength is 610-700 MPa, the elongation rate is 26-34%, the yield ratio is less than or equal to 0.85 and the low-temperature impact is more than or equal to 60 J at 20 DEG C, so that the hot-rolled steel plate is very suitable for being used as the material with higher requirements on strength, toughness and welding performance of steel, such as an automobile girder and a bridge.
Description
Technical field
The present invention relates to the production method of hot-rolled steel sheet for a kind of beam steel, the production method of the above high-strength steel K610L of especially a kind of low cost production 600 MP, belongs to ferrous metallurgy and metal material processing and field shaping technique.
Background technology
High strength, high tenacity steel, not only can improve the utilization ratio of resource, also can alleviate the weight of steel construction, is the developing direction of ferrous materials.The steel of production high strength, high tenacity, mainly adopt Nb, V alloy steel billet at present, through cooling controlling and rolling controlling process, realize.Not only will consume Nb, the V alloy of a large amount of costlinesses, cause STEELMAKING PRODUCTION cost high, but also require steel rolling process have the milling train equipment of high rigidity, large rolling load and roll rear quick cooling equipment etc., make steel rolling process equipment investment large, technical requirements is high.Therefore, seek a kind of do not need to add more expensive Nb, V alloy, and adopt cheap alloy replacing, by rational process for making, control again, when reducing the alloying cost of smelting, with common cooling controlling and rolling controlling process equipment, the method that just can produce high tensile hot rolled steel sheet, can provide for the development of existing iron and steel enterprise robust techniques support.
Summary of the invention
The present invention aims to provide a kind of method of hot-rolled steel sheet or steel band for low cost production beam steel, to solve in existing steelmaking process, when producing high-strength hot-rolled plate or band and using strand, Nb, V microalloy cost are high, strand transverse crack is difficult controls, and under common rolling equipment condition, is difficult to adopt cooling controlling and rolling controlling process to produce the problems such as high-strength hot-rolled plate (steel band).
Beam steel provided by the invention has the Chemical Composition of following weight ratio with hot-rolled steel sheet: C≤0.12 wt%, Si:0.10～0.34 wt%, Mn:1.50～1.80 wt%, Ti:0.050～0.090 wt%, Als:0.020～0.060 wt%, S≤0.010 wt%, P≤0.020 wt%, N≤0.004 wt% and: C*Ti≤0.0070 wt%, all the other are Fe and inevitable impurity.
The method of hot-rolled steel sheet for a kind of low cost production beam steel provided by the invention, process the following step:
A, by sending in LD converter containing the molten iron of S≤0.005%, carry out top bottom blowing, and carry out conventional slag making, controlling tapping temperature is 1625～1655 ℃, terminal C content is 0.04～0.07 wt%, tapping;
Before B, tapping, by 3～4 kg/t
steelamount, to ladle bottom, add CaO content to be greater than the lime of 92 wt%, by 1～2kg/t
steelamount, then to add CaO content be 43.00wt%, Al
2o
3content is the refining slag of 38.00wt%, tapping;
C, when ladle molten steel amount is greater than 1/5, first by 19.2～20.1kg/t
steelamount, to adding Mn content in ladle, be the low carbon ferromanganese of 82.50 wt%, then by 1.80～2.40kg/t
steelamount, to adding Si content in ladle, be the ferrosilicon of 74.50 wt%, finally by 1.5～2.6kg/t
steelamount, to adding Al content in ladle, be the iron core aluminium of 50.00 wt%, carry out deoxidation alloying; Tapping process adopts wash heat and omnidistance BOTTOM ARGON BLOWING, and argon flow amount control is 25～35NL/min;
After D, tapping, molten steel winches to argon station to carry out routine and determines oxygen, and adds oxygen activity to 0.0015～0.0020wt% in ferro-aluminum adjustment steel, and whole process is carried out Argon with the argon gas that flow is 15～25 NL/min;
E, determine after oxygen, molten steel is sent into LF stove, the argon gas Argon that is 15～25NL/min with flow 2 minutes, and electrode insertion is changed slag in 3～4 minutes, by 1.89～2.83 kg/t
steelamount, add CaO content to be greater than the lime of 92 wt%, then by 0.38～0.57kg/t
steelamount, add CaC
2content is greater than the calcium carbide of 95.00 wt%, by 0.19～0.57kg/t
steelamount, be sprinkled into the aluminum shot residue adjustment that Al content is greater than 99.90 wt%, afterwards by 0.4～0.6kg/t
steelamount, in the top of the slag, be sprinkled into the ferrosilicon powder that Si content is 74.50wt%, after slag Pao Dropletsization, electrode insertion is heated to 1580～1600 ℃ by liquid steel temperature;
F, oxygen activity≤0.0005 wt% in steel, Als is 0.040～0.070%, slag composition is: FeO+MnO < 1.0wt %, SiO
2during <15.0 wt%, strengthen argon flow amount to the bright circle that forms 300～400mm, afterwards by 3.63～4.82 kg/t
steelamount, in bright circle, adding Ti content is the ferrotianium of 30.00wt%, with flow, is the argon gas Argon 3min of 10～15 NL/min, fully carries out Ti Alloying;
G, by 6～8m/ t
steelamount, to opening, water stove feeding silico-calcium iron wire, or by 6～8 m/ t
steelamount, to company, water stove feeding silico-calcium iron wire, with flow, be the argon gas Argon 8min of 10～15 NL/min, press afterwards 0.75～0.94 kg/t
steelamount, add conventional ladle covering agent, send conventional casting, obtain strand;
H, by the strand of step G, to send temperature be the process furnace of 1230～1270 ℃, heats 150～250 minutes, come out of the stove, and the high pressure water that is 15～20MPa with pressure is to coming out of the stove 10～15 seconds of slab positive and negative water jet descaling;
I, by the slab after step H de-scaling, sending Steckel mill, is 1100～1200 ℃ at start rolling temperature, under the condition that roll speed is 2～3m/s, carries out the continuous roughing of 4～6 passages, opens water coolant between passage simultaneously, obtains roughing steel plate;
J, by step I gained roughing steel plate time delay 30～60 seconds, make roughing steel billet temperature lower than 900 ℃, under the roll speed of 4～7m/s, carry out the continuous finish rolling of 3～5 passage, and open water coolant between passage, controlling finishing temperature is 790～830 ℃, obtains finish rolling steel plate;
K, send reeling machine to batch step J gained finish rolling steel plate, and to control coiling temperature be 540～580 ℃, control 25～30 ℃/s of laminar flow speed of cooling simultaneously, obtain roll of steel plate;
L, by step K gained roll of steel plate natural air cooling to room temperature, obtain beam steel hot-rolled steel coiled sheet.
The refining slag of described step B is the slag that the refining steel process especially of making steel produces.
The process furnace of described step H is conventional equipment, and slab is controlled at 40～60 minutes in the heat-up time of soaking zone, and fully heavy molten to guarantee separating out Ti microalloy element in slab, refine austenite crystal grain is also separated out and prepared for cooling control after rolling, even internal structure of slab.
In described step J, roughing steel plate is carried out to time delay, to allow roughing steel plate in ground roll, back and forth move about 30～60 seconds, carry out again afterwards finish rolling, and control finish rolling total deformation rate and be greater than 40%, allow the slab generation relaxation after continuous roughing gross distortion separate out, the roughed bloom that obtains evenly tiny austenite structure, effectively prevents the generation of mixed crystal.
25～30 ℃/s of laminar flow speed of cooling of described step K, in order to control precipitation strength and the solution strengthening of microalloy, by controlling coiling temperature, reach the object of controlling pearlitic transformation pattern, size, quantity and distribution, to guarantee that product has enough intensity and toughness simultaneously.
Adopting the inventive method to produce beam steel K610L has the following advantages:
1, adopt the present invention to produce beam steel K610L, at steelmaking process by reducing tapping temperature, control rational terminal C content, guarantee argon blowing time, strictly controlling the measures such as refinement and deoxidation, the nitrogen that can control in steel contains amount≤0.004%, available titanium alloy replaces expensive Nb, V microalloy, significantly reduce the production cost of high-strength plate, and can solve the problem that titanium recovery rate is low and unstable, casting process bears water mouth and Nb-microalloying is produced high-strength plate transverse corner crack line.
2, adopt the present invention to produce beam steel K610L, the potentiality of existing steckel mill have fully been excavated, make it to complete continuously roughing and finish rolling on a steckel mill, expanded strip range of product, optimized product structure.
3, in the operation of rolling, add time delay rolling technology, made to add the Ti micro alloying element in steel to play one's part to the full, obtained fine uniform tissue, thereby prevent the appearance of mixed crystal, effectively improved intensity and the toughness of K610L beam steel.
4, utilize composition of the present invention and production technique, by the strict control of each link in actual production process, the product that makes to produce has high intensity, ductility and toughness and good welding property etc., yield strength 510～580MPa, tensile strength 600～700MPa, degree of stretching rate: 24～32%, yield tensile ratio≤0.88, low-temperature impact work-20 ℃ >=60J, is very suitable for the material of the intensity of steel, toughness and welding property being had relatively high expectations as automotive frame and bridge etc.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
embodiment 1
A method for hot-rolled steel sheet for low cost production beam steel, process the following step:
A, by sending in 50 tons of LD converters containing the molten iron of S≤0.005%, carry out top bottom blowing, and carry out conventional slag making, controlling tapping temperature is 1625 ℃, terminal C content is 0.04wt%, tapping;
Before B, tapping, by 3 kg/t
steelamount, to ladle bottom, add CaO content to be greater than the lime of 92 wt%, by 1kg/t
steelamount, then to add CaO content be 43.00wt%, Al
2o
3content is the refining slag of 38.00wt%, tapping;
C, when ladle molten steel amount is greater than 1/5, first press 19.2kg/t
steelamount, to adding Mn content in ladle, be the low carbon ferromanganese of 82.50 wt%, then press 1.80kg/t
steelamount, to adding Si content in ladle, be the ferrosilicon of 74.50 wt%, finally press 1.5kg/t
steelamount, to adding Al content in ladle, be the iron core aluminium of 50.00 wt%, carry out deoxidation alloying; Tapping process adopts wash heat and omnidistance BOTTOM ARGON BLOWING, and argon flow amount is controlled as 25NL/min;
After D, tapping, molten steel winches to argon station to carry out routine and determines oxygen, and adds that in ferro-aluminum adjustment steel, oxygen activity is to 0.0015wt%, and whole process is carried out Argon with the argon gas that flow is 15 NL/min;
E, determine after oxygen, molten steel is sent into LF stove, the argon gas Argon that is 15NL/min with flow 2 minutes, and electrode insertion is changed slag in 3 minutes, by 1.89 kg/t
steelamount, add CaO content to be greater than the lime of 92 wt%, then press 0.38kg/t
steelamount, add CaC
2content is greater than the calcium carbide of 95.00 wt%, by 0.19kg/t
steelamount, be sprinkled into the aluminum shot residue adjustment that Al content is greater than 99.90 wt%, press afterwards 0.4kg/t
steelamount, in the top of the slag, be sprinkled into the ferrosilicon powder that Si content is 74.50wt%, after slag Pao Dropletsization, electrode insertion is heated to 1580 ℃ by liquid steel temperature;
F, oxygen activity≤0.0005 wt% in steel, Als is 0.040%, slag composition is: FeO+MnO < 1.0wt %, SiO
2during <15.0 wt%, strengthen argon flow amount to the bright circle that forms 300mm, afterwards by 3.63 kg/t
steelamount, in bright circle, adding Ti content is the ferrotianium of 30.00wt%, with flow, is the argon gas Argon 3min of 10 NL/min, fully carries out Ti Alloying;
G, press 6m/ t
steelamount, to opening, water stove feeding silico-calcium iron wire, with flow, be the argon gas Argon 8min of 10 NL/min, press afterwards 0.75 kg/t
steelamount, add conventional ladle covering agent, send conventional casting, obtain strand;
H, by the strand of step G, to send temperature be the process furnace of 1230 ℃, heat 150 minutes, make slab be controlled at 40 minutes in the heat-up time of soaking zone simultaneously, to guarantee that separating out Ti microalloy element in slab fully weighs molten, refine austenite crystal grain is also separated out and is prepared for cooling control after rolling, evenly internal structure of slab, comes out of the stove afterwards, and the high pressure water that is 15MPa with pressure is to coming out of the stove 10 seconds of slab positive and negative water jet descaling;
I, by the slab after step H de-scaling, sending Steckel mill, is 1100 ℃ at start rolling temperature, under the condition that roll speed is 2m/s, carries out the continuous roughing of 6 passages, opens water coolant between passage simultaneously, obtains roughing steel plate;
J, step I gained roughing steel plate is sent in ground roll and back and forth moved about 30 seconds, make roughing steel billet temperature lower than 900 ℃, under the roll speed of 4m/s, carry out the continuous finish rolling of 5 passage, control finish rolling total deformation rate and be greater than 40%, allow the slab generation relaxation after continuous roughing gross distortion separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, open water coolant between passage, controlling finishing temperature is 790 ℃, obtains finish rolling steel plate simultaneously;
K, send reeling machine to batch step J gained finish rolling steel plate, and to control coiling temperature be 540 ℃, control 25 ℃/s of laminar flow speed of cooling simultaneously, to control precipitation strength and the solution strengthening of microalloy, by controlling coiling temperature, reach the pearlitic transformation pattern of control simultaneously, size, the object of quantity and distribution, to guarantee that product has enough intensity and toughness, obtain the following steel plate of Chemical Composition: C≤0.12 wt%, Si:0.10 wt%, Mn:1.50 wt%, Ti:0.050 wt%, Als:0.020 wt%, S≤0.010 wt%, P≤0.020 wt%, N≤0.004 wt% and: C*Ti≤0.0070 wt%, all the other are Fe and inevitable impurity,
L, by step K gained steel plate natural air cooling to room temperature, obtain beam steel hot-rolled steel sheet.
embodiment 2
A method for hot-rolled steel sheet for low cost production beam steel, process the following step:
A, by sending in 50 tons of LD converters containing the molten iron of S≤0.005%, carry out top bottom blowing, and carry out conventional slag making, controlling tapping temperature is 1655 ℃, terminal C content is 0.07 wt%, tapping;
Before B, tapping, by 4 kg/t
steelamount, to ladle bottom, add CaO content to be greater than the lime of 92 wt%, by 2kg/t
steelamount, then to add CaO content be 43.00wt%, Al
2o
3content is the refining slag of 38.00wt%, tapping;
C, when ladle molten steel amount is greater than 1/5, first press 20.1kg/t
steelamount, to adding Mn content in ladle, be the low carbon ferromanganese of 82.50 wt%, then press 2.40kg/t
steelamount, to adding Si content in ladle, be the ferrosilicon of 74.50 wt%, finally press 2.6kg/t
steelamount, to adding Al content in ladle, be the iron core aluminium of 50.00 wt%, carry out deoxidation alloying; Tapping process adopts wash heat and omnidistance BOTTOM ARGON BLOWING, and argon flow amount is controlled as 35NL/min;
After D, tapping, molten steel winches to argon station to carry out routine and determines oxygen, and adds that in ferro-aluminum adjustment steel, oxygen activity is to 0.0020wt%, and whole process is carried out Argon with the argon gas that flow is 25 NL/min;
E, determine after oxygen, molten steel is sent into LF stove, the argon gas Argon that is 25NL/min with flow 2 minutes, and electrode insertion is changed slag in 4 minutes, by 2.83 kg/t
steelamount, add CaO content to be greater than the lime of 92 wt%, then press 0.57kg/t
steelamount, add CaC
2content is greater than the calcium carbide of 95.00 wt%, by 0.57kg/t
steelamount, be sprinkled into the aluminum shot residue adjustment that Al content is greater than 99.90 wt%, press afterwards 0.6kg/t
steelamount, in the top of the slag, be sprinkled into the ferrosilicon powder that Si content is 74.50wt%, after slag Pao Dropletsization, electrode insertion is heated to 1600 ℃ by liquid steel temperature;
F, oxygen activity≤0.0005 wt% in steel, Als is 0.070%, slag composition is: FeO+MnO < 1.0wt %, SiO
2during <15.0 wt%, strengthen argon flow amount to the bright circle that forms 400mm, afterwards by 4.82 kg/t
steelamount, in bright circle, adding Ti content is the ferrotianium of 30.00wt%, with flow, is the argon gas Argon 3min of 15 NL/min, fully carries out Ti Alloying;
G, by 8 m/ t
steelamount, to company, water stove feeding silico-calcium iron wire, with flow, be the argon gas Argon 8min of 15 NL/min, press afterwards 0.94 kg/t
steelamount, add conventional ladle covering agent, send conventional casting, obtain strand;
H, by the strand of step G, to send temperature be the process furnace of 1270 ℃, heat 250 minutes, make slab be controlled at 60 minutes in the heat-up time of soaking zone simultaneously, to guarantee that separating out Ti microalloy element in slab fully weighs molten, refine austenite crystal grain is also separated out and is prepared for cooling control after rolling, evenly internal structure of slab, comes out of the stove afterwards, and the high pressure water that is 20MPa with pressure is to coming out of the stove 15 seconds of slab positive and negative water jet descaling;
I, by the slab after step H de-scaling, sending Steckel mill, is 1200 ℃ at start rolling temperature, under the condition that roll speed is 3m/s, carries out the continuous roughing of 4 passages, opens water coolant between passage simultaneously, obtains roughing steel plate;
J, step I gained roughing steel plate is sent in ground roll and back and forth moved about 60 seconds, make roughing steel billet temperature lower than 900 ℃, under the roll speed of 7m/s, carry out the continuous finish rolling of 3 passage, control finish rolling total deformation rate and be greater than 40%, allow the slab generation relaxation after continuous roughing gross distortion separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, open water coolant between passage, controlling finishing temperature is 830 ℃, obtains finish rolling steel plate simultaneously;
K, send reeling machine to batch step J gained finish rolling steel plate, and to control coiling temperature be 580 ℃, control 30 ℃/s of laminar flow speed of cooling simultaneously, to control precipitation strength and the solution strengthening of microalloy, by controlling coiling temperature, reach the pearlitic transformation pattern of control simultaneously, size, the object of quantity and distribution, to guarantee that product has enough intensity and toughness, obtain the following steel plate of Chemical Composition: C≤0.12 wt%, Si:0.34 wt%, Mn:1.80 wt%, Ti:0.090 wt%, Als:0.060 wt%, S≤0.010 wt%, P≤0.020 wt%, N≤0.004 wt% and: C*Ti≤0.0070 wt%, all the other are Fe and inevitable impurity,
L, by step K gained steel plate natural air cooling to room temperature, obtain beam steel hot-rolled steel sheet.
embodiment 3
A method for hot-rolled steel sheet for low cost production beam steel, process the following step:
A, by sending in 50 tons of LD converters containing the molten iron of S≤0.005%, carry out top bottom blowing, and carry out conventional slag making, controlling tapping temperature is 1645 ℃, terminal C content is 0.056wt%, tapping;
Before B, tapping, by 3.5 kg/t
steelamount, to ladle bottom, add CaO content to be greater than the lime of 92 wt%, by 1.5kg/t
steelamount, then to add CaO content be 43.00wt%, Al
2o
3content is the refining slag of 38.00wt%, tapping;
C, when ladle molten steel amount is greater than 1/5, first press 19.66kg/t
steelamount, to adding Mn content in ladle, be the low carbon ferromanganese of 82.50 wt%, then press 1.940kg/t
steelamount, to adding Si content in ladle, be the ferrosilicon of 74.50 wt%, finally press 1.96kg/t
steelamount, to adding Al content in ladle, be the iron core aluminium of 50.00 wt%, carry out deoxidation alloying; Tapping process adopts wash heat and omnidistance BOTTOM ARGON BLOWING, and argon flow amount is controlled as 30NL/min;
After D, tapping, molten steel winches to argon station to carry out routine and determines oxygen, and adds that in ferro-aluminum adjustment steel, oxygen activity is to 0.0018wt%, and whole process is carried out Argon with the argon gas that flow is 19 NL/min;
E, determine after oxygen, molten steel is sent into LF stove, the argon gas Argon that is 19NL/min with flow 2 minutes, and electrode insertion is changed slag in 3 minutes, by 2.23 kg/t
steelamount, add CaO content to be greater than the lime of 92 wt%, then press 0.45kg/t
steelamount, add CaC
2content is greater than the calcium carbide of 95.00 wt%, by 0.37kg/t
steelamount, be sprinkled into the aluminum shot residue adjustment that Al content is greater than 99.90 wt%, press afterwards 0.49kg/t
steelamount, in the top of the slag, be sprinkled into the ferrosilicon powder that Si content is 74.50wt%, after slag Pao Dropletsization, electrode insertion is heated to 1595 ℃ by liquid steel temperature;
F, oxygen activity≤0.0005 wt% in steel, Als is 0.057%, slag composition is: FeO+MnO < 1.0wt %, SiO
2during <15.0 wt%, strengthen argon flow amount to the bright circle that forms 350mm, afterwards by 3. 88 kg/t
steelamount, in bright circle, adding Ti content is the ferrotianium of 30.00wt%, with flow, is the argon gas Argon 3min of 13 NL/min, fully carries out Ti Alloying;
G, press 7m/ t
steelamount, to opening, water stove feeding silico-calcium iron wire, with flow, be the argon gas Argon 8min of 12 NL/min, press afterwards 0.89 kg/t
steelamount, add conventional ladle covering agent, send conventional casting, obtain strand;
H, by the strand of step G, to send temperature be the process furnace of 1250 ℃, heat 170 minutes, make slab be controlled at 50 minutes in the heat-up time of soaking zone simultaneously, to guarantee that separating out Ti microalloy element in slab fully weighs molten, refine austenite crystal grain is also separated out and is prepared for cooling control after rolling, evenly internal structure of slab, comes out of the stove afterwards, and the high pressure water that is 18MPa with pressure is to coming out of the stove 13 seconds of slab positive and negative water jet descaling;
I, by the slab after step H de-scaling, sending Steckel mill, is 1180 ℃ at start rolling temperature, under the condition that roll speed is 2m/s, carries out the continuous roughing of 5 passages, opens water coolant between passage simultaneously, obtains roughing steel plate;
J, step I gained roughing steel plate is sent in ground roll and back and forth moved about 45 seconds, make roughing steel billet temperature lower than 900 ℃, under the roll speed of 6m/s, carry out the continuous finish rolling of 4 passage, control finish rolling total deformation rate and be greater than 40%, allow the slab generation relaxation after continuous roughing gross distortion separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, open water coolant between passage, controlling finishing temperature is 800 ℃, obtains finish rolling steel plate simultaneously;
K, send reeling machine to batch step J gained finish rolling steel plate, and to control coiling temperature be 560 ℃, control 28 ℃/s of laminar flow speed of cooling simultaneously, to control precipitation strength and the solution strengthening of microalloy, by controlling coiling temperature, reach the pearlitic transformation pattern of control simultaneously, size, the object of quantity and distribution, to guarantee that product has enough intensity and toughness, obtain the following steel plate of Chemical Composition: C≤0.12 wt%, Si:0.23 wt%, Mn:1.68 wt%, Ti:0.079 wt%, Als:0.046 wt%, S≤0.010 wt%, P≤0.020 wt%, N≤0.004 wt% and: C*Ti≤0.0070 wt%, all the other are Fe and inevitable impurity,
L, by step K gained steel plate natural air cooling to room temperature, obtain beam steel hot-rolled steel sheet.
Claims (1)
1. the method for hot-rolled steel sheet for a low cost production beam steel, described beam steel has the Chemical Composition of following weight ratio with hot-rolled steel sheet: C≤0.12 wt%, Si:0.10～0.34 wt%, Mn:1.50～1.80 wt%, Ti:0.050～0.090 wt%, Als:0.020～0.060 wt%, S≤0.010 wt%, P≤0.020 wt%, N≤0.004 wt% and: C*Ti≤0.0070 wt%, all the other are Fe and inevitable impurity, it is characterized in that through the following step:
A, by sending in LD converter containing the molten iron of S≤0.005%, carry out top bottom blowing, and carry out conventional slag making, controlling tapping temperature is 1625～1655 ℃, terminal C content is 0.04～0.07 wt%, tapping;
Before B, tapping, by 3～4 kg/t
steelamount, to ladle bottom, add CaO content to be greater than the lime of 92 wt%, by 1～2kg/t
steelamount, then to add CaO content be 43.00wt%, Al
2o
3content is the refining slag of 38.00wt%, tapping;
C, when ladle molten steel amount is greater than 1/5, first by 19.2～20.1kg/t
steelamount, to adding Mn content in ladle, be the low carbon ferromanganese of 82.50 wt%, then by 1.80～2.40kg/t
steelamount, to adding Si content in ladle, be the ferrosilicon of 74.50 wt%, finally by 1.5～2.6kg/t
steelamount, to adding Al content in ladle, be the iron core aluminium of 50.00 wt%, carry out deoxidation alloying; Tapping process adopts wash heat and omnidistance BOTTOM ARGON BLOWING, and argon flow amount control is 25～35NL/min;
After D, tapping, molten steel winches to argon station to carry out routine and determines oxygen, and adds oxygen activity to 0.0015～0.0020wt% in ferro-aluminum adjustment steel, and whole process is carried out Argon with the argon gas that flow is 15～25 NL/min;
E, determine after oxygen, molten steel is sent into LF stove, the argon gas Argon that is 15～25NL/min with flow 2 minutes, and electrode insertion is changed slag in 3～4 minutes, by 1.89～2.83 kg/t
steelamount, add CaO content to be greater than the lime of 92 wt%, then by 0.38～0.57kg/t
steelamount, add CaC
2content is greater than the calcium carbide of 95.00 wt%, by 0.19～0.57kg/t
steelamount, be sprinkled into the aluminum shot residue adjustment that Al content is greater than 99.90 wt%, afterwards by 0.4～0.6kg/t
steelamount, in the top of the slag, be sprinkled into the ferrosilicon powder that Si content is 74.50wt%, after slag Pao Dropletsization, electrode insertion is heated to 1580～1600 ℃ by liquid steel temperature;
F, oxygen activity≤0.0005 wt% in steel, Als is 0.040～0.070%, slag composition is: FeO+MnO < 1.0wt %, SiO
2during <15.0 wt%, strengthen argon flow amount to the bright circle that forms 300～400mm, afterwards by 3.63～4.82 kg/t
steelamount, in bright circle, adding Ti content is the ferrotianium of 30.00wt%, with flow, is the argon gas Argon 3min of 10～15 NL/min, fully carries out Ti Alloying;
G, by 6～8m/ t
steelamount, to opening, water stove feeding silico-calcium iron wire, or by 6～8 m/ t
steelamount, to company, water stove feeding silico-calcium iron wire, with flow, be the argon gas Argon 8min of 10～15 NL/min, press afterwards 0.75～0.94 kg/t
steelamount, add conventional ladle covering agent, send conventional casting, obtain strand;
H, by the strand of step G, to send temperature be the process furnace of 1230～1270 ℃, heats 150～250 minutes, come out of the stove, and the high pressure water that is 15～20MPa with pressure is to coming out of the stove 10～15 seconds of slab positive and negative water jet descaling;
I, by the slab after step H de-scaling, sending Steckel mill, is 1100～1200 ℃ at start rolling temperature, under the condition that roll speed is 2～3m/s, carries out the continuous roughing of 4～6 passages, opens water coolant between passage simultaneously, obtains roughing steel plate;
J, by step I gained roughing steel plate time delay 30～60 seconds, make roughing steel billet temperature lower than 900 ℃, under the roll speed of 4～7m/s, carry out the continuous finish rolling of 3～5 passage, and open water coolant between passage, controlling finishing temperature is 790～830 ℃, obtains finish rolling steel plate;
K, send reeling machine to batch step J gained finish rolling steel plate, and to control coiling temperature be 540～580 ℃, control 25～30 ℃/s of laminar flow speed of cooling simultaneously, obtain roll of steel plate;
L, by step K gained roll of steel plate natural air cooling to room temperature, obtain beam steel hot-rolled steel coiled sheet.
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| CN109219670B (en) * | 2016-08-09 | 2020-09-04 | 杰富意钢铁株式会社 | High-strength thick steel plate and method for producing same |
| CN109182639B (en) * | 2018-09-13 | 2020-07-14 | 马鞍山钢铁股份有限公司 | Method for improving cleanliness of 420MPa high-strength automobile girder steel under calcium-free treatment process condition |
| CN111363879A (en) * | 2018-12-25 | 2020-07-03 | 新疆八一钢铁股份有限公司 | Production control method for steelmaking continuous casting of high-strength automobile hub steel |
| CN111235477B (en) * | 2020-02-28 | 2021-09-21 | 本钢板材股份有限公司 | 950MPa thin-specification hot-rolled automobile girder steel and preparation method thereof |
| CN113862418A (en) * | 2020-06-30 | 2021-12-31 | 宝山钢铁股份有限公司 | CSP production method of crack-resistant bridge steel |
| CN115747617B (en) * | 2022-11-29 | 2024-04-19 | 北京科技大学 | Titanium reinforced automobile girder steel, preparation method and application |
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