CN105331769A - Deep-drawing pure iron for high-strength fastening piece and production method of deep-drawing pure iron - Google Patents
Deep-drawing pure iron for high-strength fastening piece and production method of deep-drawing pure iron Download PDFInfo
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- CN105331769A CN105331769A CN201510630796.3A CN201510630796A CN105331769A CN 105331769 A CN105331769 A CN 105331769A CN 201510630796 A CN201510630796 A CN 201510630796A CN 105331769 A CN105331769 A CN 105331769A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses deep-drawing pure iron for a high-strength fastening piece and a production method of the deep-drawing pure iron. The deep-drawing pure iron comprises, by mass, 0.015%-0.025% of C, not larger than 0.03% of Si, not larger than 0.15% of Mn, 0.06%-0.08% of Ti, 0.03%-0.05% of Al, not larger than 0.015% of P, not larger than 0.015% of S and the balance Fe and inevitable impurities. The production method includes the steps that blast furnace molten iron is subjected to converter smelting, LF furnace refining, RH furnace refining, continuous casting, controlled rolling and controlled cooling and coil collection, and the deep-drawing pure iron is obtained. According to the deep-drawing pure iron and the production method, a pure iron coil rod which is low in production cost and high in strength and is used for deep drawing is produced through an existing refining process and the controlled rolling and controlled cooling process, the produced hot-rolled coil rod can meet the requirements that tensile strength reaches 340+/-20 Mpa and one third of cold-headed products are qualified, and the requirement for high-strength fasting pieces of furniture production of downstream enterprises is met.
Description
Technical field
The invention belongs to technical field of steel production, relate to a kind of high-intensity fasteners deep-draw pure iron and production method thereof.
Background technology
The principal feature of deep-draw pure iron is that material is soft, plasticity good, not easy to crack when big distortion.Be generally used for and produce the larger rivet processing of deflection, its strength of parent requires lower, plays the effect of attractive, decorative, low strength anchoring, is widely used in the aspects such as case and bag, perambulator, tables and chairs.
The cold heading performance of deep-draw pure iron general requirement wire rod mother metal, to strength of parent not requirement, according to normal control, the intensity of pure iron only has about 280Mpa.But in the recent period down-stream enterprise proposes a kind of fastening piece pure iron demand of furniture application, wherein propose to adopt Φ 6.5mm specification wire rod to produce, wire rod strength of parent need meet the qualified demand of 340 ± 20Mpa, cold upsetting 1/3.User uses domestic wire rod to find to reach both to meet tensile strength, possess again the requirement of aximal deformation value, and according to imported materials and items, user cost can increase, the stability of the source of goods cannot be ensured simultaneously, therefore need domestic steel mill development of new material badly and meet its needs.
Analyze the service requirements of user, it claims to wire rod mother metal performance and mainly contains: tensile strength is 340 ± 20Mpa, and cold upsetting 1/3 is qualified for this reason; This intensity belongs to high strength span of control at pure iron steel grade category, and normal pure iron can not reach high strength so.Therefore we analyze this pure iron material specific aim, and have carried out design optimization from aspects such as composition, Control and Inclusion Removal, controlled rolling and controlled cooling, metallographic structures to steel grade.Pure iron steel grade technique generally adopts the technique of converter-RH stove-continuous casting, Xing Gang is according to the rational stitch technique route of existing installation, have employed the operational path of the fine work steel two pyrogene material of converter-LF stove-RH stove-continuous casting-cogging-controlled rolling and controlled cooling, develop High-strength pure iron pan bar, meet the deep-draw pure iron steel grade demand that down-stream enterprise's tensile strength is 340 ± 20Mpa.
Summary of the invention
The present invention seeks to utilize converter, LF stove, RH stove, continuous casting, cogging, controlled rolling and controlled cooling operational path production tensile strength be 340 ± 20Mpa, cold upsetting 1/3 qualified deep-draw pure iron class wire rod, make it possess and be easy to drawing and the wire rod product that intensity is higher, plasticity is good, meet the demand of user for pure iron fastening piece aspect.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of high-intensity fasteners deep-draw pure iron, described deep-draw pure iron chemical composition mass percent is as follows: C:0.015 ~ 0.025%, Si≤0.03%, Mn≤0.15%, Ti:0.06 ~ 0.08%, Al:0.03-0.05%, P≤0.015%, S≤0.015%, surplus is Fe and inevitable impurity.
A production method for high-intensity fasteners deep-draw pure iron, blast-melted through converter smelting, the refining of LF stove, the refining of RH stove, continuous casting, controlled rolling and controlled cooling, collection volume operation, obtain described deep-draw pure iron, specific embodiment is as follows:
(1) converter smelting: blast-melted carry out desulfurization process after, be blended into combined blown converter smelt, add aluminium block deoxidation after tapping, top slag add lime 2.0-3.5kg/T;
(2) LF stove refining: after LF enters the station, slag charge add-on is as follows: lime 2.0-4.0kg/T, and uses carbide of calcium, aluminum shot slag making; And be warming up to 1650 ~ 1680 DEG C, push up slag color based on white or light green, FeO and MnO quality sum≤1.0% in slag, molten steel oxygen≤50ppm leaving from station;
(3) RH stove refining: molten steel is winched to RH stove, forvacuum also carries out oxygen blast pressure Decarburization Operation, forces carbonization treatment complete, use aluminum shot deoxidation, add carbon dust 0.15-0.20kg/t, ferrotianium 1.3-1.6kg/t carries out alloying constituent adjustment in oxygen blast;
(4) continuous casting: RH stove, after carrying out Calcium treatment and soft blow 8min, winches to continuous caster and is cast into bloom before leaving from station;
The mass percent of composition in middle Baogang water: C:0.015 ~ 0.025%, Si≤0.03%, Mn≤0.15%, Ti:0.06 ~ 0.08%, Al:0.03-0.05%, P≤0.015%, S≤0.015%, surplus is Fe and inevitable impurity;
(5) controlled rolling and controlled cooling: after bloom cogging, enter process furnace and be warming up to 1070 ~ 1090 DEG C, steel billet of coming out of the stove carries out dephosphorize by high pressure water, enters high speed mill rolling; It is 880 ± 15 DEG C that the operation of rolling enters final rolling temperature, and laying temperature is 910 ± 10 DEG C, then through collection volume operation, obtains described deep-draw pure iron.
In step of the present invention (5) controlled rolling and controlled cooling operation, the steel billet after rolling enters Stelmor cooling line, and regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is 1.5 ~ 2.0 DEG C/s.
In step of the present invention (3) RH stove refining procedure, described forvacuum is also carried out in oxygen blast pressure decarburization, and controling parameters is: remaining oxygen controls at 300-450ppm; After aluminum shot deoxidation, control Oxygen Content in Liquid Steel≤15ppm leaving from station.
In step of the present invention (3) RH stove refining procedure, oxygen blast adopts full pump to vacuumize process, vacuum tightness≤150pa after forcing Decarburization Operation to terminate, and controls decarburization circulation time 10-15min.
In step of the present invention (3) RH stove refining procedure, described in add carbon dust, ferrotianium carries out alloying constituent adjustment, makes C:0.015 ~ 0.025% in molten steel, Ti:0.06 ~ 0.08%; Calcium treatment leaving from station simultaneously, control Ca:25-45ppm.
In step of the present invention (3) RH stove refining procedure, described RH circulation time 10-15min.
In step of the present invention (1) converter smelting operation, blast-melted middle S≤0.013%.
In step of the present invention (4) continuous casting working procedure, described bloom specification is 325 × 280mm
2.
In step of the present invention (5) controlled rolling and controlled cooling operation, described bloom cogging becomes 160 × 160mm
2specification
The technology of the present invention principle is as follows: 1, pure iron steel grade due to whole composition lower, it is all ferrite that wire rod is organized, be difficult to separately through controlled rolling and controlled cooling means adjustment mechanical property.Therefore need to increase solution strengthening element C, user requires some strength scope simultaneously, in steel grade, carried out vernier control in 0.015 ~ 0.025% interval to C element.
2, for meeting user's deep drawability needs, adopt and improve tissue, deformation method for grain refinement, improves wire rod performance, grain refining makes number of grain boundaries increase, and crystal boundary is the obstacle of dislocation motion, crystal boundary can also be limited to viscous deformation in certain scope, makes distortion homogenizing, crystal boundary is also the resistance of crack propagation, crystal grain is thinner, and crack propagation critical stress is larger, and the toughness of material better.
First add Ti element at steel grade, in molten steel, produce tiny dystectic Ti type impurity, thus process of setting promotes ferrite IGF nucleation rate, plays the effect of induced nucleation, reaches the object effectively splitting crystal grain, thinning microstructure.
Next utilizes TiN pinning crystal boundary, effectively suppresses the grain growth after recrystallize and recrystallize, realizes raw-material grain refining and phase transformation strengthening, improves wire rod intensity and also improves plasticity simultaneously.
Simultaneously adopt adjustment rolling line cooling controlling and rolling controlling process in rolling link, realize low temperature rolling, control material grains degree and grow up, refinement crystal grain.
3, for ensureing adding of steel grade Ti element, LF stove adopts the top Slag treatment mode of complete deoxidation, effectively reduces the loss of Ti alloy, carries out Calcium treatment and soft blow before RH stove is leaving from station simultaneously, form lower melting point inclusion with deoxidation products Al2O3 in steel, avoid mouth of a river wadding stream impact in casting cycle.
Mentality of designing of the present invention is as follows: 1, first adopt self peculiar technical process: blast-melted-converter-LF stove-RH stove-bloom caster-process furnace-cogging-process furnace-dephosphorize by high pressure water-high-speed rolling-collection volume.
2, for steel grade intensity, improve pure iron steel grade C Composition Control scope, heated up by LF stove and good top slag transformation of the way process, carry out the adjustment of molten steel alloying constituent at RH stove, ensure that deoxidation of molten steel is good simultaneously, reduce harmful inclusion in steel by RH circulation.
3, in order to improve the cold heading performance of material, the RH stove later stage adds Ti element, produces tiny dystectic Ti type impurity, thus promotes ferrite IGF nucleation rate, plays the effect of induced nucleation, reaches the object effectively splitting crystal grain, thinning microstructure.
Adopt adjustment rolling line cooling controlling and rolling controlling process in rolling link simultaneously, utilize TiN pinning crystal boundary, effectively suppress the grain growth after recrystallize and recrystallize, realize raw-material grain refining and phase transformation strengthening, improve wire rod intensity and also improve plasticity simultaneously.
4, adopt adjustment rolling line cooling controlling and rolling controlling process in rolling link, realize low temperature rolling, reach the object controlling material grains degree and grow up from temperature control aspect.
The beneficial effect adopting technique scheme to produce is: utilize existing refinery practice, cooling controlling and rolling controlling process, the deep-draw pure iron wire rod of production low cost, high strength, the As rolled wire rod tensile strength that this invention is produced can reach 340 ± 20Mpa, cold upsetting 1/3 is qualified, can meet the demand that down-stream enterprise produces furniture high-intensity fasteners simultaneously.
Accompanying drawing explanation
Fig. 1 is normal pure iron steel grade grain fineness number micro-structure diagram;
Fig. 2 is the micro-structure diagram of deep-draw pure iron crystal grain thinning.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further detailed explanation.
Embodiment 1
Deep-draw pure iron chemical composition mass percent is as follows: C:0.025%, Si:0.03%, Mn:0.15%, Ti:0.08%, Al:0.04%, P:0.015%, S:0.015%, and surplus is Fe and inevitable impurity.
Production technique is as follows:
(1) be blast-meltedly blended into converter smelting, tapping adds aluminium block deoxidation, and the later stage adds lime 2.0kg/T.
(2), after LF enters the station, top slag adds lime 2.0kg/T, and uses carbide of calcium, aluminum shot slag making; And being warming up to 1650 DEG C, top slag is white, and in slag, (FeO+MnO) is 1.0%, molten steel oxygen 50ppm leaving from station.
(3) molten steel is winched to RH stove, forvacuum also carries out OB operation (oxygen blast pressure decarburization), adopts full pump to vacuumize process after OB, controls vacuum tightness 150pa; After OB terminates, control decarburization circulation time 8min, decarburization terminates to determine oxygen, and remaining oxygen controls at 300ppm, and uses aluminum shot deoxidation according to determining oxygen value, adds carbon dust, ferrotianium carries out alloying constituent adjustment, RH circulation time 10min after deoxidation.
(4) RH stove Oxygen Content in Liquid Steel leaving from station is 15ppm, carries out Calcium treatment before leaving from station, and molten steel Ca controls at 25ppm, after soft blow 8min, winches to continuous caster casting.The mass percent of composition in middle Baogang water: C:0.025%, Si:0.03%, Mn:0.15%, Ti:0.08%, Al:0.04%, P:0.015%, S:0.015%, surplus is Fe and inevitable impurity.
(5), after bloom cogging, enter process furnace and be warming up to 1090 DEG C, steel billet of coming out of the stove carries out dephosphorize by high pressure water, enters high speed mill rolling.The operation of rolling is entered final rolling temperature and is controlled at 895 DEG C, and laying temperature controls at 920 DEG C.
Enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling controls at 2.0 DEG C/s.
The deep-draw pure iron tensile strength obtained is 360Mpa, and cold upsetting 1/3 is qualified.
Embodiment 2
Deep-draw pure iron chemical composition mass percent is as follows: C:0.015%, Si:0.02%, Mn:0.12%, Ti:0.06%, Al:0.03%, P:0.012%, S:0.010%, and surplus is Fe and inevitable impurity.
Production technique is as follows:
(1) be blast-meltedly blended into converter smelting, tapping adds aluminium block deoxidation, and the later stage adds lime 3.5kg/T.
(2), after LF enters the station, top slag adds lime 4.0kg/T, and uses carbide of calcium, aluminum shot slag making; And being warming up to 1680 DEG C, top slag color is light green, and in slag, (FeO+MnO) is 0.95%, and molten steel oxygen leaving from station is 35ppm.
(3) molten steel is winched to RH stove, forvacuum also carries out OB operation (oxygen blast pressure decarburization), adopts full pump to vacuumize process after OB, controls vacuum tightness 150pa; After OB terminates, control decarburization circulation time 8min, decarburization terminates to determine oxygen, and remaining oxygen controls at 450ppm, and uses aluminum shot deoxidation according to determining oxygen value, adds carbon dust, ferrotianium carries out alloying constituent adjustment, RH circulation time 12min after deoxidation.
(4) RH stove Oxygen Content in Liquid Steel leaving from station is 12ppm, carries out Calcium treatment before leaving from station, and molten steel Ca controls at 35ppm, after soft blow 8min, winches to continuous caster casting.The mass percent of composition in middle Baogang water: C:0.015%, Si:0.02%, Mn:0.12%, Ti:0.06%, Al:0.03%, P:0.012%, S:0.010%, surplus is Fe and inevitable impurity.
(5), after bloom cogging, enter process furnace and be warming up to 1070 DEG C, steel billet of coming out of the stove carries out dephosphorize by high pressure water, enters high speed mill rolling.The operation of rolling is entered final rolling temperature and is controlled at 865 DEG C, and laying temperature controls at 900 DEG C.
Enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling controls at 1.5 DEG C/s.
The deep-draw pure iron tensile strength obtained is 320Mpa, and cold upsetting 1/3 is qualified.
Embodiment 3
Deep-draw pure iron chemical composition mass percent is as follows: C:0.019%, Si:0.02%, Mn:0.11%, Ti:0.07%, Al:0.05%, P:0.012%, S:0.009%, and surplus is Fe and inevitable impurity.
Production technique is as follows:
(1) be blast-meltedly blended into converter smelting, tapping adds aluminium block deoxidation, and the later stage adds lime 3.0kg/T.
(2), after LF enters the station, top slag adds lime 3.0kg/T, and uses carbide of calcium, aluminum shot slag making; And being warming up to 1670 DEG C, top slag color is light green, and in slag, (FeO+MnO) is 0.88%, and molten steel oxygen leaving from station is 25ppm.
(3) molten steel is winched to RH stove, forvacuum also carries out OB operation (oxygen blast pressure decarburization), adopts full pump to vacuumize process after OB, controls vacuum tightness 150pa; After OB terminates, control decarburization circulation time 8min, decarburization terminates to determine oxygen, and remaining oxygen controls at 400ppm, and uses aluminum shot deoxidation according to determining oxygen value, adds carbon dust, ferrotianium carries out alloying constituent adjustment, RH circulation time 15min after deoxidation.
(4) RH stove Oxygen Content in Liquid Steel leaving from station is 8ppm, carries out Calcium treatment before leaving from station, and molten steel Ca controls at 45ppm, after soft blow 8min, winches to continuous caster casting.The mass percent of composition in middle Baogang water: C:0.019%, Si:0.02%, Mn:0.11%, Ti:0.07%, Al:0.05%, P:0.012%, S:0.009%, surplus is Fe and inevitable impurity.
(5), after bloom cogging, enter process furnace and be warming up to 1080 DEG C, steel billet of coming out of the stove carries out dephosphorize by high pressure water, enters high speed mill rolling.The operation of rolling is entered final rolling temperature and is controlled at 880 DEG C, and laying temperature controls at 910 DEG C.
Enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling controls at 1.7 DEG C/s.
The deep-draw pure iron tensile strength obtained is 332Mpa, and cold upsetting 1/3 is qualified.
Embodiment 4
Deep-draw pure iron chemical composition mass percent is as follows: C:0.021%, Si:0.02%, Mn:0.09%, Ti:0.07%, Al:0.04%, P:0.012%, S:0.008%, and surplus is Fe and inevitable impurity.
Production technique is as follows:
(1) be blast-meltedly blended into converter smelting, tapping adds aluminium block deoxidation, and the later stage adds lime 2.5kg/T.
(2), after LF enters the station, top slag adds lime 3.5kg/T, and uses carbide of calcium, aluminum shot slag making; And being warming up to 1660 DEG C, top slag color is with light green, and in slag, (FeO+MnO) is 0.92%, and molten steel oxygen leaving from station is 32ppm.
(3) molten steel is winched to RH stove, forvacuum also carries out OB operation (oxygen blast pressure decarburization), adopts full pump to vacuumize process after OB, controls vacuum tightness 150pa; After OB terminates, control decarburization circulation time 8min, decarburization terminates to determine oxygen, and remaining oxygen controls at 350ppm, and uses aluminum shot deoxidation according to determining oxygen value, adds carbon dust, ferrotianium carries out alloying constituent adjustment, RH circulation time 13min after deoxidation.
(4) RH stove Oxygen Content in Liquid Steel control leaving from station 6ppm, carries out Calcium treatment before leaving from station, and molten steel Ca controls at 40ppm, after soft blow 8min, winches to continuous caster casting.The mass percent of composition in middle Baogang water: C:0.021%, Si:0.02%, Mn:0.09%, Ti:0.07%, Al:0.04%, P:0.012%, S:0.008%, surplus is Fe and inevitable impurity.
(5), after bloom cogging, enter process furnace and be warming up to 1085 DEG C, steel billet of coming out of the stove carries out dephosphorize by high pressure water, enters high speed mill rolling.The operation of rolling is entered final rolling temperature and is controlled at 885 DEG C, and laying temperature controls at 915 DEG C.
Enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling controls at 1.8 DEG C/s.
The deep-draw pure iron tensile strength obtained is 348Mpa, and cold upsetting 1/3 is qualified.
Claims (10)
1. a high-intensity fasteners deep-draw pure iron, it is characterized in that, described deep-draw pure iron chemical composition mass percent is as follows: C:0.015 ~ 0.025%, Si≤0.03%, Mn≤0.15%, Ti:0.06 ~ 0.08%, Al:0.03-0.05%, P≤0.015%, S≤0.015%, surplus is Fe and inevitable impurity.
2. based on the production method of a kind of high-intensity fasteners deep-draw pure iron according to claim 1, blast-melted through converter smelting, the refining of LF stove, the refining of RH stove, continuous casting, controlled rolling and controlled cooling, collection volume operation, obtain described deep-draw pure iron, it is characterized in that, specific embodiment is as follows:
(1) converter smelting: blast-melted carry out desulfurization process after, be blended into combined blown converter smelt, add aluminium block deoxidation after tapping, top slag add lime 2.0-3.5kg/T;
(2) LF stove refining: after LF enters the station, slag charge add-on is as follows: lime 2.0-4.0kg/T, uses carbide of calcium, aluminum shot slag making, be warming up to 1650 ~ 1680 DEG C, push up slag color based on white or light green, FeO and MnO quality sum≤1.0% in slag, molten steel oxygen≤50ppm leaving from station;
(3) RH stove refining: molten steel is winched to RH stove, forvacuum also carries out oxygen blast pressure Decarburization Operation, forces carbonization treatment complete, use aluminum shot deoxidation, add carbon dust 0.15-0.20kg/t, ferrotianium 1.3-1.6kg/t carries out alloying constituent adjustment in oxygen blast;
(4) continuous casting: RH stove, after carrying out Calcium treatment and soft blow 8min, winches to continuous caster and is cast into bloom before leaving from station;
The mass percent of composition in middle Baogang water: C:0.015 ~ 0.025%, Si≤0.03%, Mn≤0.15%, Ti:0.06 ~ 0.08%, Al:0.03-0.05%, P≤0.015%, S≤0.015%, surplus is Fe and inevitable impurity;
(5) controlled rolling and controlled cooling: after bloom cogging, enter process furnace and be warming up to 1070 ~ 1090 DEG C, steel billet of coming out of the stove carries out dephosphorize by high pressure water, enters high speed mill rolling; It is 880 ± 15 DEG C that the operation of rolling enters final rolling temperature, and laying temperature is 910 ± 10 DEG C, then through collection volume operation, obtains described deep-draw pure iron.
3. production method according to claim 2, it is characterized in that, in described step (5) controlled rolling and controlled cooling operation, the steel billet after rolling enters Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is 1.5 ~ 2.0 DEG C/s.
4. production method according to claim 2, is characterized in that, in described step (3) RH stove refining procedure, described forvacuum is also carried out in oxygen blast pressure decarburization, and controling parameters is: remaining oxygen controls at 300-450ppm; After aluminum shot deoxidation, control Oxygen Content in Liquid Steel≤15ppm leaving from station.
5. production method according to claim 2, is characterized in that, in described step (3) RH stove refining procedure, oxygen blast adopts full pump to vacuumize process, vacuum tightness≤150pa after forcing Decarburization Operation to terminate, and controls decarburization circulation time 10-15min.
6. production method according to claim 2, is characterized in that, in described step (3) RH stove refining procedure, described in add carbon dust, ferrotianium carries out alloying constituent adjustment, makes C:0.015 ~ 0.025% in molten steel, Ti:0.06 ~ 0.08%; Calcium treatment leaving from station simultaneously, control Ca:25-45ppm.
7. production method according to claim 2, is characterized in that, in described step (3) RH stove refining procedure, and described RH circulation time 10-15min.
8. production method according to claim 2, is characterized in that, in described step (1) converter smelting operation, and blast-melted middle S≤0.013%.
9. production method according to claim 2, is characterized in that, in described step (4) continuous casting working procedure, described bloom specification is 325 × 280mm
2.
10. production method according to claim 2, is characterized in that, in described step (5) controlled rolling and controlled cooling operation, described bloom cogging becomes 160 × 160mm
2specification.
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| CN109825763A (en) * | 2019-01-23 | 2019-05-31 | 邢台钢铁有限责任公司 | A kind of high conductivity cathode band steel ingot iron and its production method |
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| CN113604723A (en) * | 2021-07-13 | 2021-11-05 | 日照钢铁控股集团有限公司 | Rolled steel and control method for inclusions in rolled steel |
| CN114632816A (en) * | 2022-02-18 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Heating and rolling method of industrial pure iron |
| CN114632816B (en) * | 2022-02-18 | 2024-02-23 | 包头钢铁（集团）有限责任公司 | Heating and rolling method for industrial pure iron |
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