CN105296853A - 930-MPa high-strength finished deformed steel bars and preparation technology thereof - Google Patents
930-MPa high-strength finished deformed steel bars and preparation technology thereof Download PDFInfo
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- CN105296853A CN105296853A CN201510863527.1A CN201510863527A CN105296853A CN 105296853 A CN105296853 A CN 105296853A CN 201510863527 A CN201510863527 A CN 201510863527A CN 105296853 A CN105296853 A CN 105296853A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 112
- 239000010959 steel Substances 0.000 title claims abstract description 112
- 238000005516 engineering process Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 163
- 238000001816 cooling Methods 0.000 claims abstract description 105
- 238000000034 method Methods 0.000 claims abstract description 65
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 23
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 23
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 81
- 238000007670 refining Methods 0.000 claims description 62
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 59
- 238000011084 recovery Methods 0.000 claims description 54
- 238000010079 rubber tapping Methods 0.000 claims description 27
- 229910052742 iron Inorganic materials 0.000 claims description 22
- 238000009749 continuous casting Methods 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- 239000002893 slag Substances 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 14
- 230000008676 import Effects 0.000 claims description 14
- 238000003801 milling Methods 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 230000011218 segmentation Effects 0.000 claims description 11
- 238000005496 tempering Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 7
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000000470 constituent Substances 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000012840 feeding operation Methods 0.000 claims description 7
- -1 ferrovanadium nitride Chemical class 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000007688 edging Methods 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 235000019628 coolness Nutrition 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003014 reinforcing effect Effects 0.000 description 20
- 238000011105 stabilization Methods 0.000 description 10
- 230000006698 induction Effects 0.000 description 9
- 230000007812 deficiency Effects 0.000 description 7
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 6
- 229910010271 silicon carbide Inorganic materials 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- 238000009966 trimming Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000007669 thermal treatment Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Abstract
The invention relates to the technical field of deformed steel bar production in the metallurgical industry, in particular to 930-MPa high-strength finished deformed steel bars and a preparation technology thereof. The 930-MPa high-strength finished deformed steel bars are composed of C of 0.40-0.50%, Mn of 0.80-1.20%, Si of 1.45-1.85%, V of 0.120-0.220%, S smaller than or equal to 0.030%, P smaller than or equal to 0.030% and the balance Fe. According to the preparation technology, the rolling production process route of coldly feeding billets into a heating furnace for heating, whole-process low-temperature control rolling, repeated intermittent control cooling, clamping and conveying tail steel through clamping rollers, sectioning by a multi-length flying shear, cooling by a cooling bed and indoor stacking and stack cooling is adopted. The 930-MPa high-strength finished deformed steel bars have the advantages of being low in production cost and high in quality stability. The preparation technology has the advantages that the processes are simplified, the finish rolling effect is excellent, the cooling effect after rolling is remarkable, the quality of the steel bars is not damaged or lowered, and the economic benefit and the social benefit are remarkable.
Description
(1) technical field
The present invention relates to metallurgy industry Twisted Steel production technical field, particularly a kind of 930MPa high-intensity fine rolling Deformed Steel Bars and preparation technology thereof.
(2) background technology
930MPa finish rolling deformed bar generally adopts Tempering and Quenching mode to produce at present at home and abroad.When to this kind of long section product thermal treatment, selecting more is both at home and abroad the type of heating of induction heating.Induction heating utilizes electromagnetic induction principle to make inside workpiece in alternating magnetic field produce eddy current, and workpiece relies on the joule heating of these electric currents to reach the method for estimating temperature.At home, carrying out induction heating to large gauge ribbed bar, modified once someone did research, and the research and development patent of China Anshan iron and steel plant 930MPa level reinforcing bar is exactly that the induction heating adopted is heat-treated.
At present, domestic and international most of enterprise takes off-line thermal treatment process route to produce 930MPa high-intensity fine rolling Deformed Steel Bars product, and the technological process of production is: feeding skid+dial steel device by root to dial steel+conveyor roller+1# induction furnace (being heated to 820 DEG C)+recovery section+2# induction furnace (being heated to 920 DEG C)+recovery section+quenching box process (water-cooled to 400 DEG C)+recovery section+3# induction furnace (temper is to 580-600 DEG C)+runoff table+blanking rack+naturally cooling+saw head, cut scale.This operational path long flow path, cost is high, constant product quality is limited, and in its technique, cooling adopts one-time continuous cold by force, and surface martensite is blocked up, the problems such as easily cause elongation defective.
The present invention proposes a kind of new processing technology routine being different from Heat Treatment technique and off-line quenching-and-tempering process, this operational path produce 930MPa high-intensity fine rolling Deformed Steel Bars product without off-line thermal treatment namely realize quality index stablize qualified, product quality is high, cost 300 yuan/t-500 lower than off-line thermal treatment process unit/t, remarkable in economical benefits.
(3) summary of the invention
The present invention is in order to make up the deficiencies in the prior art, provide the 930MPa high-intensity fine rolling Deformed Steel Bars that a kind of production cost is low, quality stability is high, also provide that a kind of flow process for the preparation of this 930MPa high-intensity fine rolling Deformed Steel Bars is short simultaneously, finish rolling excellent effect, roller repairing Be very effective and do not damage or reduce the technique of reinforcing bar quality, remarkable in economical benefits, solve problems of the prior art.
The present invention is achieved through the following technical solutions:
A kind of 930MPa high-intensity fine rolling Deformed Steel Bars, be made up of the composition of following weight percent: C:0.40-0.50%, Mn:0.80-1.20%, Si:1.45-1.85%, V:0.120-0.220%, S≤0.030%, P≤0.030%, surplus is Fe.
The preparation technology of this 930MPa high-intensity fine rolling Deformed Steel Bars, comprises following operation steps:
Prepared by A steel billet:
(1) converter is slightly refined: by molten iron, (main component is C, Si, Mn, P, S, all the other are Fe element, constituent content control overflow Si≤0.70%, P≤0.13%, S≤0.055%, other is without specific requirement) and steel scrap add according to the weight ratio of 9:1 and bessemerize 13-15 minute; Blow complete, control endpoint carbon content >=0.06%, terminal temperature≤1680 DEG C; Silicomanganese and ferrovanadium nitride alloy element (element addition adjusts accordingly according to C, Si, Mn actual content) is added in tapping process, guarantee weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn;
(2) LF stove refining: the molten steel that step (1) is tapped is winched to the refining of LF stove, refining furnace uses silicon carbide and ferrosilicon powder to carry out making white slag operation, after refining slag is adjusted to white, carry out trimming operation again, ensure that composition is all in the scope of above-mentioned elemental composition; Require refining time >=30 minute, white slag hold-time >=20 minutes, carry out line feeding operation by 2 ± 0.1m/t after completing refining operation.Ensure line outer soft blow time >=15 minutes.During refining furnace tapping, tapping temperature controls at 1555 DEG C-1565 DEG C; Carry out determining oxygen operation, by free Control for Oxygen Content within 12ppm before refining furnace tapping;
(3) continuous small-billet casting: step (2) is winched to cast station through the molten steel of LF stove refining.Continuous casting production uses stopper bag to produce, whole process protection is poured into a mould, and tundish temperature controls at 1505 DEG C-1525 DEG C, and casting speed control is at 1.3m/min-1.6m/min, require whole draw steel process pulling speed of continuous casting fluctuate be less than ± 0.01m/min, liquid level fluctuation of crystallizer is less than ± 3mm; Continuous casting becomes small billet, cuts into the billet scaling of different lengths according to different rolling specs;
B rolling:
The small billet cold charge that steps A is poured into a mould is entered process furnace heating, furnace temperature of heating furnace 1080 ± 30 DEG C, small billet is heated to 960-1000 DEG C in process furnace, heat-up time >=rolling of coming out of the stove after 1.5 hours; Adopt the controlled rolling of omnidistance stream low temperature: the small billet of coming out of the stove is sent into mill milling, first the iron scale that a de-scaling is used for removing small billet surface is carried out to steel billet, then enter roughing mill, altogether rolling 6 passages, roll speed: 0.34m/s-1.75m/s; Rolling time 46-48s; Enter middle milling train afterwards, altogether rolling 4 passages, roll speed: 2.40m/s-4.32m/s; Rolling time 46-48s; Finally enter finishing mill, altogether rolling 4 passages, roll speed: 5.50m/s-8.50m/s; Rolling time 46-48s;
C aftertreatment:
Adopted by the finish rolling steel of step B rolling the cold mode of discontinuous control to carry out cooling process, be supplied to cold bed after cooling by roller-way, then Double Dimension Flying Shears segmentation, cold bed tempering cooling, indoor piling cooling in heap, to obtain final product;
The cold discontinuous control for recovering after first wearing water of discontinuous control described in step C is cold;
Discontinuous control described in step C is cold is that the discontinuous control that recovers after first wearing water three times is cold;
Described first wear water three times after the discontinuous control that recovers is cold is:
The section of recovery after Water cooling for the first time: enter one " 60-80 rice " section of recovery after controlled rolling " 4 meters+4 meters " two Water cooling; The temperature of this section of Water cooling import is 800 ± 20 DEG C, and hydraulic pressure control is 0.40 ± 0.30MPa;
The section of recovery after second time Water cooling: enter one 4 meters of recovery sections after controlled rolling 4 meters of Water cooling and enter one 4 meters of recovery sections again; Cooling water pressure≤the 0.60MPa of this section of Water cooling;
The section of recovery after Water cooling for the third time: enter one 2 meters of recovery sections after controlled rolling 2 meters of Water cooling and enter one 4 meters of recovery sections again; The temperature of this section of Water cooling import is 550 ± 10 DEG C, and hydraulic pressure control is 0.20MPa ± 0.02.
The finishing pass sequence of " K4 elliptical aperture+K3 edging pass for rolling+K2 is with the elliptical aperture+K1 finished hole of bottom land convexity " is adopted to carry out finish rolling in step B rolling.
Step C Double Dimension Flying Shears is segmented into " 5# flying shear " segmentation.
The finishing pass sequence of " K4 elliptical aperture+K3 edging pass for rolling+K2 is with the elliptical aperture+K1 finished hole of bottom land convexity " is adopted to carry out finish rolling in step B rolling.
Step C cold bed tempering temperature is 650-670 DEG C.
The invention has the beneficial effects as follows:
Preparation technology of the present invention had both been different from the induction heating off-line heat treatment technics route of domestic and international high cost technological line, also be different from: the inferior quality technological line of Heat Treatment by Rolling Heat, by above-mentioned brand-new processing technology routine, take series of process and equipment technology innovative measure, cost 300-500 yuan/ton lower than the thermal treatment of induction heating off-line, quality stability far above Heat Treatment by Rolling Heat processing technology routine, and realizes stably manufactured and the steady quality of 930MPa high-strength finish rolling deformed bar under new low cost process technological line condition.Major advantage and effect as follows:
1, the discontinuous control recovered after implementing first to wear water three times in post-processing step is cold, avoid one-time continuous by force cold, that surface martensite is blocked up (more than 1.5mm) causes elongation do not conform to problem, by ensure that the mitigation of the cold falling temperature gradient of discontinuous control to the control of hydraulic pressure and the water yield, avoid controlled rolling speed of cooling too fast generation abnormal structure.
2, by the 4# flying shear of former Double Dimension Flying Shears, adopt 5# flying shear to substitute, be exclusively used in the multiple length segmentation of 930MPa finish rolling screw thread, overcome cold bed difficulty on former Double Dimension Flying Shears shear ability deficiency, tail steel, cause the problem of unstable properties because tail steel transfer rate fluctuates.
3, Double Dimension Flying Shears entrance establishes pinch roll on new, implements tail steel clamp and send technique, achieve roll rear rebar full length constant speed rolling, constant speed control is cold, thus ensure that the consistence of rebar full length performance.
4, the finishing pass sequence of " K4 elliptical aperture+K3 edging pass for rolling+K2 is with the elliptical aperture+K1 finished hole of bottom land convexity ", achieve reinforcing bar basic circle high precision that is high, wide and cross rib height and control, the high precision met between reinforcing bar with junctor is connected; Form a groove and cut, make reinforcing bar in fixed size scissors shear history, bear three-dimensional compressive stress, solve the cracked problem of bar cutting.
5, the yield strength comparatively GB 930MPa height 50-120MPa of 930Mpa fining twisted steel that obtains of this preparation technology, tensile strength is GB 1080MPa height 50-170MPa comparatively, unit elongation is the high 1.0%-4.0% of GB 6.0% comparatively, and quality stability is high, product with stable quality.
| Mechanical property | Yield strength MPa | Tensile strength MPa | Unit elongation % |
| Mechanical property numerical value | 980-1050 | 1130-1250 | 7.0-10.0 |
(4) embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited thereto.
Embodiment 1:
A kind of preparation technology of 930MPa high-intensity fine rolling Deformed Steel Bars: adopt following operation steps:
Prepared by A steel billet:
(1) converter is slightly refined: by molten iron, (main component is C, Si, Mn, P, S, all the other are Fe element, constituent content control overflow Si≤0.70%, P≤0.13%, S≤0.055%, other is without specific requirement) and steel scrap add converter according to the weight ratio of 9:1 and carry out blowing operation, duration of blast 14 minutes, blow and completely require endpoint carbon content >=0.06%, terminal temperature≤1680 DEG C; Silicomanganese and ferrovanadium nitride alloy element (element addition adjusts accordingly according to C, Si, Mn actual content) is added in tapping process, guarantee weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn.
(2) LF stove refining: the molten steel that step (1) is tapped is winched to the refining of LF stove: refining furnace uses silicon carbide and ferrosilicon powder to carry out making white slag operation, after refining slag is adjusted to white, carry out trimming operation again, ensure that composition is all in the scope of above-mentioned elemental composition; Refining time 30 minutes, 20 minutes white slag hold-times, carries out line feeding operation by 2m/t after completing refining operation, ensures the line outer 15 minutes soft blow time; During refining furnace tapping, tapping temperature controls at 1555 DEG C; Carry out determining oxygen operation, by free Control for Oxygen Content within 12ppm before refining furnace tapping.
(3) continuous small-billet casting: step (2) is winched to cast station through the molten steel of LF stove refining, continuous casting production uses stopper bag to produce, whole process protection is poured into a mould, tundish temperature controls at 1505 DEG C, casting speed control is at 1.3m/min, require whole draw steel process pulling speed of continuous casting fluctuate be less than ± 0.01m/min, liquid level fluctuation of crystallizer is less than ± 3mm; Continuous casting becomes the small billet of 165mm × 165mm specification, cuts into the billet scaling of different lengths according to different rolling specs.The chemical composition of this steel billet is: C:0.40%, Mn:0.80%, Si:1.45%, V:0.120%, S:0.030%, P:0.030%, and surplus is Fe.
B rolling:
The small billet cold charge that steps A is poured into a mould is entered process furnace heating, furnace temperature of heating furnace 1080 DEG C, small billet is heated to 960 DEG C in process furnace, heats rolling of coming out of the stove after 1.5 hours; Adopt the controlled rolling of omnidistance stream low temperature: the small billet of coming out of the stove is sent into mill milling, first the iron scale that a de-scaling is used for removing small billet surface is carried out to steel billet, then enter roughing mill, altogether rolling 6 passages, roll speed: 0.34m/s; Rolling time 46s; Enter middle milling train afterwards, altogether rolling 4 passages, roll speed: 2.40m/s; Rolling time 46s; Finally enter finishing mill, altogether rolling 4 passages, roll speed: 5.50m/s; Rolling time 46s; Finally obtain finish rolling steel.
C aftertreatment:
Adopted by the finish rolling steel of step B rolling the cold mode of discontinuous control of replying after first wearing water three times to carry out cooling process, comprise controlled rolling and controlled cooling and recover section layout, design parameter and operation:
The section of recovery after Water cooling for the first time: enter one 80 meters after controlled rolling " 4 meters+4 meters " two Water cooling and recover sections; The temperature of this section of Water cooling import is 800 DEG C, and hydraulic pressure control is 0.40MPa;
The section of recovery after second time Water cooling: enter one 4 meters of recovery sections after controlled rolling 4 meters of Water cooling and enter one 4 meters of recovery sections again; The cooling water pressure of this section of Water cooling controls as 0.60MPa;
The section of recovery after Water cooling for the third time: enter one 2 meters of recovery sections after controlled rolling 2 meters of Water cooling and enter one 4 meters of recovery sections again; The temperature of this section of Water cooling import is 550 DEG C, and hydraulic pressure control is 0.20MPa.
After above-mentioned three Water cooling, be supplied to cold bed fast by roller-way, pinch roll pinches in process guarantees reinforcing bar poker velocity-stabilization, guarantees reinforcing bar poker velocity-stabilization, and the process that pinches adopts automatically to detect and identifies that tail steel system pinches; Then carry out the segmentation of 5# Double Dimension Flying Shears, overcome cold bed difficulty on former Double Dimension Flying Shears shear ability deficiency, tail steel, cause the problem of unstable properties because tail steel transfer rate fluctuates; Carry out cold bed tempering cooling, indoor piling cooling in heap again 7 days, obtain a kind of 930MPa high-intensity fine rolling Deformed Steel Bars.
The chemical composition of the 930MPa high-intensity fine rolling Deformed Steel Bars reinforcing bar that above-mentioned steps obtains is: C:0.40%, Mn:0.80%, Si:1.45%, V:0.120%, S:0.030%, P:0.030%, surplus is Fe.
Embodiment 2:
A preparation technology for 930MPa high-intensity fine rolling Deformed Steel Bars, adopts following operation steps:
Prepared by A steel billet:
(1) converter is slightly refined: by molten iron, (main component is C, Si, Mn, P, S, all the other are Fe element, constituent content control overflow Si≤0.70%, P≤0.13%, S≤0.055%, other is without specific requirement) and steel scrap add according to the weight ratio of 9:1 and bessemerize 13 minutes; Blow complete, control endpoint carbon content >=0.06%, terminal temperature≤1680 DEG C; Silicomanganese and ferrovanadium nitride alloy element (element addition adjusts accordingly according to C, Si, Mn actual content) is added in tapping process, guarantee weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn;
(2) LF stove refining: the molten steel that step (1) is tapped is winched to the refining of LF stove, refining furnace uses silicon carbide and ferrosilicon powder to carry out making white slag operation, after refining slag is adjusted to white, carry out trimming operation again, ensure that composition is all in the scope of above-mentioned elemental composition; Refining time 50 minutes, 30 minutes white slag hold-times, carries out line feeding operation by 1.9m/t after completing refining operation.Ensure line outer soft blow time >=minute.During refining furnace tapping, tapping temperature controls at 1565 DEG C; Carry out determining oxygen operation, by free Control for Oxygen Content within 12ppm before refining furnace tapping;
(3) continuous small-billet casting: step (2) is winched to cast station through the molten steel of LF stove refining.Continuous casting production uses stopper bag to produce, and whole process protection is poured into a mould, and tundish temperature controls at 1525 DEG C, and casting speed control is at 1.6m/min, and require wholely to draw steel process pulling speed of continuous casting to fluctuate to be less than ± 0.01m/min, liquid level fluctuation of crystallizer is less than ± 3mm; Continuous casting becomes small billet, cuts into the billet scaling of different lengths according to different rolling specs;
B rolling:
The small billet cold charge that steps A is poured into a mould is entered process furnace heating, furnace temperature of heating furnace 1110 DEG C, small billet is heated to 1000 DEG C in process furnace, heats rolling of coming out of the stove after 2 hours; Adopt the controlled rolling of omnidistance stream low temperature: the small billet of coming out of the stove is sent into mill milling, first the iron scale that a de-scaling is used for removing small billet surface is carried out to steel billet, then enter roughing mill, altogether rolling 6 passages, roll speed: 1.75m/s; Rolling time 48s; Enter middle milling train afterwards, altogether rolling 4 passages, roll speed: 4.32m/s; Rolling time 48s; Finally enter finishing mill, altogether rolling 4 passages, roll speed: 8.50m/s; Rolling time 48s;
C aftertreatment:
Adopted by the finish rolling steel of step B rolling the cold mode of discontinuous control of replying after first wearing water three times to carry out cooling process, comprise controlled rolling and controlled cooling and recover section layout, design parameter and operation:
The section of recovery after Water cooling for the first time: enter one 60 meters after controlled rolling " 4 meters+4 meters " two Water cooling and recover sections; The temperature of this section of Water cooling import is 820 DEG C, and hydraulic pressure control is 0.70MPa;
The section of recovery after second time Water cooling: enter one 4 meters of recovery sections after controlled rolling 4 meters of Water cooling and enter one 4 meters of recovery sections again; Cooling water pressure≤the 0.60MPa of this section of Water cooling;
The section of recovery after Water cooling for the third time: enter one 2 meters of recovery sections after controlled rolling 2 meters of Water cooling and enter one 4 meters of recovery sections again; The temperature of this section of Water cooling import is 560 DEG C, and hydraulic pressure control is 0.22MPa.
After above-mentioned three Water cooling, be supplied to cold bed fast by roller-way, pinch roll pinches in process guarantees reinforcing bar poker velocity-stabilization, guarantees reinforcing bar poker velocity-stabilization, and the process that pinches adopts automatically to detect and identifies that tail steel system pinches; Then carry out the segmentation of 5# Double Dimension Flying Shears, overcome cold bed difficulty on former Double Dimension Flying Shears shear ability deficiency, tail steel, cause the problem of unstable properties because tail steel transfer rate fluctuates; Carry out cold bed tempering cooling, indoor piling cooling in heap again 15 days, obtain a kind of 930MPa high-intensity fine rolling Deformed Steel Bars.
The chemical composition of the 930MPa high-intensity fine rolling Deformed Steel Bars reinforcing bar that above-mentioned steps obtains is: C:0.50%, Mn:1.20%, Si:1.85%, V:0.220%, S:0.010%, P:0.020%, surplus is Fe.
Embodiment 3:
A preparation technology for 930MPa high-intensity fine rolling Deformed Steel Bars, adopts following operation steps:
Prepared by A steel billet:
(1) converter is slightly refined: by molten iron, (main component is C, Si, Mn, P, S, all the other are Fe element, constituent content control overflow Si≤0.70%, P≤0.13%, S≤0.055%, other is without specific requirement) and steel scrap add according to the weight ratio of 9:1 and bessemerize 15 minutes; Blow complete, control endpoint carbon content >=0.06%, terminal temperature≤1680 DEG C; Silicomanganese and ferrovanadium nitride alloy element (element addition adjusts accordingly according to C, Si, Mn actual content) is added in tapping process, guarantee weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn;
(2) LF stove refining: the molten steel that step (1) is tapped is winched to the refining of LF stove, refining furnace uses silicon carbide and ferrosilicon powder to carry out making white slag operation, after refining slag is adjusted to white, carry out trimming operation again, ensure that composition is all in the scope of above-mentioned elemental composition; Refining time 45 minutes, 25 minutes white slag hold-times, carries out line feeding operation by 2.1m/t after completing refining operation.Ensure line outer soft blow time >=15 minutes.During refining furnace tapping, tapping temperature controls at 1560 DEG C; Carry out determining oxygen operation, by free Control for Oxygen Content within 12ppm before refining furnace tapping;
(3) continuous small-billet casting: step (2) is winched to cast station through the molten steel of LF stove refining.Continuous casting production uses stopper bag to produce, and whole process protection is poured into a mould, and tundish temperature controls at 1516 DEG C, and casting speed control is at 1.4m/min, and require wholely to draw steel process pulling speed of continuous casting to fluctuate to be less than ± 0.01m/min, liquid level fluctuation of crystallizer is less than ± 3mm; Continuous casting becomes small billet, cuts into the billet scaling of different lengths according to different rolling specs;
B rolling:
The small billet cold charge that steps A is poured into a mould is entered process furnace heating, furnace temperature of heating furnace 1050 DEG C, small billet is heated to 980 DEG C in process furnace, heats rolling of coming out of the stove after 2.5 hours; Adopt the controlled rolling of omnidistance stream low temperature: the small billet of coming out of the stove is sent into mill milling, first the iron scale that a de-scaling is used for removing small billet surface is carried out to steel billet, then enter roughing mill, altogether rolling 6 passages, roll speed: 1.04m/s; Rolling time 47s; Enter middle milling train afterwards, altogether rolling 4 passages, roll speed: 3.36m/s; Rolling time 47s; Finally enter finishing mill, altogether rolling 4 passages, roll speed: 7.0m/s; Rolling time 47s;
C aftertreatment:
Adopted by the finish rolling steel of step B rolling the cold mode of discontinuous control of replying after first wearing water three times to carry out cooling process, comprise controlled rolling and controlled cooling and recover section layout, design parameter and operation:
The section of recovery after Water cooling for the first time: enter one 70 meters after controlled rolling " 4 meters+4 meters " two Water cooling and recover sections; The temperature of this section of Water cooling import is 780 DEG C, and hydraulic pressure control is 0.10MPa;
The section of recovery after second time Water cooling: enter one 4 meters of recovery sections after controlled rolling 4 meters of Water cooling and enter one 4 meters of recovery sections again; Cooling water pressure≤the 0.60MPa of this section of Water cooling;
The section of recovery after Water cooling for the third time: enter one 2 meters of recovery sections after controlled rolling 2 meters of Water cooling and enter one 4 meters of recovery sections again; The temperature of this section of Water cooling import is 540 DEG C, and hydraulic pressure control is 0.18MPa.
After above-mentioned three Water cooling, be supplied to cold bed fast by roller-way, pinch roll pinches in process guarantees reinforcing bar poker velocity-stabilization, guarantees reinforcing bar poker velocity-stabilization, and the process that pinches adopts automatically to detect and identifies that tail steel system pinches; Then carry out the segmentation of 5# Double Dimension Flying Shears, overcome cold bed difficulty on former Double Dimension Flying Shears shear ability deficiency, tail steel, cause the problem of unstable properties because tail steel transfer rate fluctuates; Carry out cold bed tempering cooling, indoor piling cooling in heap again 12 days, obtain a kind of 930MPa high-intensity fine rolling Deformed Steel Bars.
The chemical composition of the 930MPa high-intensity fine rolling Deformed Steel Bars reinforcing bar that above-mentioned steps obtains is: C:0.47%, Mn:1.1%, Si:1.63%, V:0.170%, S:0.022%, P:0.016%, surplus is Fe.
Embodiment 4
A preparation technology for 930MPa high-intensity fine rolling Deformed Steel Bars, adopts following operation steps:
Prepared by A steel billet:
(1) converter is slightly refined: by molten iron, (main component is C, Si, Mn, P, S, all the other are Fe element, constituent content control overflow Si≤0.70%, P≤0.13%, S≤0.055%, other is without specific requirement) and steel scrap add according to the weight ratio of 9:1 and bessemerize 14 minutes; Blow complete, control endpoint carbon content >=0.06%, terminal temperature≤1680 DEG C; Silicomanganese and ferrovanadium nitride alloy element (element addition adjusts accordingly according to C, Si, Mn actual content) is added in tapping process, guarantee weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn;
(2) LF stove refining: the molten steel that step (1) is tapped is winched to the refining of LF stove, refining furnace uses silicon carbide and ferrosilicon powder to carry out making white slag operation, after refining slag is adjusted to white, carry out trimming operation again, ensure that composition is all in the scope of above-mentioned elemental composition; Refining time 40 minutes, 35 minutes white slag hold-times, carries out line feeding operation by 2m/t after completing refining operation.Ensure line outer soft blow time >=15 minutes.During refining furnace tapping, tapping temperature controls at 1562 DEG C; Carry out determining oxygen operation, by free Control for Oxygen Content within 12ppm before refining furnace tapping;
(3) continuous small-billet casting: step (2) is winched to cast station through the molten steel of LF stove refining.Continuous casting production uses stopper bag to produce, and whole process protection is poured into a mould, and tundish temperature controls at 1510 DEG C, and casting speed control is at 1.5m/min, and require wholely to draw steel process pulling speed of continuous casting to fluctuate to be less than ± 0.01m/min, liquid level fluctuation of crystallizer is less than ± 3mm; Continuous casting becomes small billet, cuts into the billet scaling of different lengths according to different rolling specs;
B rolling:
The small billet cold charge that steps A is poured into a mould is entered process furnace heating, furnace temperature of heating furnace 1100 DEG C, small billet is heated to 970 DEG C in process furnace, heats rolling of coming out of the stove after 3 hours; Adopt the controlled rolling of omnidistance stream low temperature: the small billet of coming out of the stove is sent into mill milling, first the iron scale that a de-scaling is used for removing small billet surface is carried out to steel billet, then enter roughing mill, altogether rolling 6 passages, roll speed: 1.34m/s; Rolling time 46s; Enter middle milling train afterwards, altogether rolling 4 passages, roll speed: 3.5m/s; Rolling time 47s; Finally enter finishing mill, altogether rolling 4 passages, roll speed: 6.50m/s; Rolling time 48s;
C aftertreatment:
Adopted by the finish rolling steel of step B rolling the cold mode of discontinuous control of replying after first wearing water three times to carry out cooling process, comprise controlled rolling and controlled cooling and recover section layout, design parameter and operation:
The section of recovery after Water cooling for the first time: enter one 80 meters after controlled rolling " 4 meters+4 meters " two Water cooling and recover sections; The temperature of this section of Water cooling import is 810 DEG C, and hydraulic pressure control is 0.60MPa;
The section of recovery after second time Water cooling: enter one 4 meters of recovery sections after controlled rolling 4 meters of Water cooling and enter one 4 meters of recovery sections again; Cooling water pressure≤the 0.60MPa of this section of Water cooling;
The section of recovery after Water cooling for the third time: enter one 2 meters of recovery sections after controlled rolling 2 meters of Water cooling and enter one 4 meters of recovery sections again; The temperature of this section of Water cooling import is 545 DEG C, and hydraulic pressure control is 0.22MPa.
After above-mentioned three Water cooling, be supplied to cold bed fast by roller-way, pinch roll pinches in process guarantees reinforcing bar poker velocity-stabilization, guarantees reinforcing bar poker velocity-stabilization, and the process that pinches adopts automatically to detect and identifies that tail steel system pinches; Then carry out the segmentation of 5# Double Dimension Flying Shears, overcome cold bed difficulty on former Double Dimension Flying Shears shear ability deficiency, tail steel, cause the problem of unstable properties because tail steel transfer rate fluctuates; Carry out cold bed tempering cooling, indoor piling cooling in heap again 10 days, obtain a kind of 930MPa high-intensity fine rolling Deformed Steel Bars.
The chemical composition of the 930MPa high-intensity fine rolling Deformed Steel Bars reinforcing bar that above-mentioned steps obtains is: C:0.41%, Mn:0.97%, Si:1.59%, V:0.180%, S:0.024%, P:0.019%, surplus is Fe.
Embodiment 5
A preparation technology for 930MPa high-intensity fine rolling Deformed Steel Bars, adopts following operation steps:
Prepared by A steel billet:
(1) converter is slightly refined: by molten iron, (main component is C, Si, Mn, P, S, all the other are Fe element, constituent content control overflow Si≤0.70%, P≤0.13%, S≤0.055%, other is without specific requirement) and steel scrap add according to the weight ratio of 9:1 and bessemerize 15 minutes; Blow complete, control endpoint carbon content >=0.06%, terminal temperature≤1680 DEG C; Silicomanganese and ferrovanadium nitride alloy element (element addition adjusts accordingly according to C, Si, Mn actual content) is added in tapping process, guarantee weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn;
(2) LF stove refining: the molten steel that step (1) is tapped is winched to the refining of LF stove, refining furnace uses silicon carbide and ferrosilicon powder to carry out making white slag operation, after refining slag is adjusted to white, carry out trimming operation again, ensure that composition is all in the scope of above-mentioned elemental composition; Require refining time 35 minutes, 20 minutes white slag hold-times, after completing refining operation, carry out line feeding operation by 1.9m/t.Ensure line outer soft blow time >=15 minutes.During refining furnace tapping, tapping temperature controls at 1558 DEG C; Carry out determining oxygen operation, by free Control for Oxygen Content within 12ppm before refining furnace tapping;
(3) continuous small-billet casting: step (2) is winched to cast station through the molten steel of LF stove refining.Continuous casting production uses stopper bag to produce, and whole process protection is poured into a mould, and tundish temperature controls at 1510 DEG C, and casting speed control is at 1.45m/min, and require wholely to draw steel process pulling speed of continuous casting to fluctuate to be less than ± 0.01m/min, liquid level fluctuation of crystallizer is less than ± 3mm; Continuous casting becomes small billet, cuts into the billet scaling of different lengths according to different rolling specs;
B rolling:
The small billet cold charge that steps A is poured into a mould is entered process furnace heating, furnace temperature of heating furnace 1090 DEG C, small billet is heated to 990 DEG C in process furnace, rolling of coming out of the stove after 2.5 hours heat-up times; Adopt the controlled rolling of omnidistance stream low temperature: the small billet of coming out of the stove is sent into mill milling, first the iron scale that a de-scaling is used for removing small billet surface is carried out to steel billet, then enter roughing mill, altogether rolling 6 passages, roll speed: 1.58m/s; Rolling time 47s; Enter middle milling train afterwards, altogether rolling 4 passages, roll speed: 2.9m/s; Rolling time 47s; Finally enter finishing mill, altogether rolling 4 passages, roll speed: 7.50m/s; Rolling time 46s;
C aftertreatment:
Adopted by the finish rolling steel of step B rolling the cold mode of discontinuous control of replying after first wearing water three times to carry out cooling process, comprise controlled rolling and controlled cooling and recover section layout, design parameter and operation:
The section of recovery after Water cooling for the first time: enter one 80 meters after controlled rolling " 4 meters+4 meters " two Water cooling and recover sections; The temperature of this section of Water cooling import is 790 DEG C, and hydraulic pressure control is 0.50MPa;
The section of recovery after second time Water cooling: enter one 4 meters of recovery sections after controlled rolling 4 meters of Water cooling and enter one 4 meters of recovery sections again; Cooling water pressure≤the 0.60MPa of this section of Water cooling;
The section of recovery after Water cooling for the third time: enter one 2 meters of recovery sections after controlled rolling 2 meters of Water cooling and enter one 4 meters of recovery sections again; The temperature of this section of Water cooling import is 555 DEG C, and hydraulic pressure control is 0.19MPa.
After above-mentioned three Water cooling, be supplied to cold bed fast by roller-way, pinch roll pinches in process guarantees reinforcing bar poker velocity-stabilization, guarantees reinforcing bar poker velocity-stabilization, and the process that pinches adopts automatically to detect and identifies that tail steel system pinches; Then carry out the segmentation of 5# Double Dimension Flying Shears, overcome cold bed difficulty on former Double Dimension Flying Shears shear ability deficiency, tail steel, cause the problem of unstable properties because tail steel transfer rate fluctuates; Carry out cold bed tempering cooling, indoor piling cooling in heap again 9 days, obtain a kind of 930MPa high-intensity fine rolling Deformed Steel Bars.
The chemical composition of the 930MPa high-intensity fine rolling Deformed Steel Bars reinforcing bar that above-mentioned steps obtains is: C:0.43%, Mn:1.17%, Si:1.74%, V:0.210%, S:0.017%, P:0.025%, surplus is Fe.
Claims (8)
1. a 930MPa high-intensity fine rolling Deformed Steel Bars, it is characterized in that: be made up of the composition of following weight percent: C:0.40-0.50%, Mn:0.80-1.20%, Si:1.45-1.85%, V:0.120-0.220%, S≤0.030%, P≤0.030%, surplus is Fe.
2. a preparation technology for 930MPa high-intensity fine rolling Deformed Steel Bars according to claim 1, is characterized in that: comprise following operation steps:
Prepared by A steel billet:
(1) converter is slightly refined: by molten iron (chemical composition C, Si, Mn, P, S, all the other are Fe element, constituent content control overflow Si≤0.70%, P≤0.13%, S≤0.055%, other is without specific requirement) and steel scrap add in converter according to the weight ratio of 9:1 and blow, blow complete control endpoint carbon content >=0.06%, terminal temperature≤1680 DEG C; Add silicomanganese and ferrovanadium nitride alloy element in tapping process, ensure weight content≤0.35% of the C of molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn;
(2) LF stove refining: the molten steel that step (1) is tapped is winched to the refining of LF stove, refining furnace carries out making white slag operation, refining time >=30 minute, white slag hold-time >=20 minutes, carry out line feeding operation by 1.9-2.1m/t after completing refining operation, ensure line outer soft blow time >=15 minutes; Refining furnace tapping temperature controls at 1555 DEG C-1565 DEG C; Carry out determining oxygen operation, by free Control for Oxygen Content within 12ppm before refining furnace tapping;
(3) continuous small-billet casting: step (2) is winched to cast station through the molten steel of LF stove refining, continuous casting production uses stopper bag to produce, whole process protection is poured into a mould, tundish temperature controls at 1505 DEG C-1525 DEG C, casting speed control is at 1.3m/min-1.6m/min, require wholely to draw steel process pulling speed of continuous casting fluctuation range ± 0.01m/min, liquid level fluctuation of crystallizer scope ± 3mm; Continuous casting becomes small billet, cuts into the billet scaling of different lengths according to different rolling specs;
B rolling:
The small billet cold charge that steps A is poured into a mould is entered process furnace heating, furnace temperature of heating furnace 1080 ± 30 DEG C, small billet is heated to 960-1000 DEG C in process furnace, heat-up time >=rolling of coming out of the stove after 1.5 hours; Adopt the controlled rolling of omnidistance stream low temperature: the small billet of coming out of the stove is sent into mill milling, first the iron scale that a de-scaling is used for removing small billet surface is carried out to steel billet, then enter roughing mill, altogether rolling 6 passages, roll speed: 0.34m/s-1.75m/s; Rolling time 46-48s; Enter middle milling train afterwards, altogether rolling 4 passages, roll speed: 2.40m/s-4.32m/s; Rolling time 46-48s; Finally enter finishing mill, altogether rolling 4 passages, roll speed: 5.50m/s-8.50m/s; Rolling time 46-48s;
C aftertreatment:
Adopted by the finish rolling steel of step B rolling the cold mode of discontinuous control to carry out cooling process, be supplied to cold bed after cooling by roller-way, then Double Dimension Flying Shears segmentation, cold bed tempering cooling, indoor piling cooling in heap, to obtain final product;
The cold discontinuous control for recovering after first wearing water of discontinuous control described in step C is cold.
3. the preparation technology of a kind of 930MPa high-intensity fine rolling Deformed Steel Bars according to claim 2, is characterized in that: the control of step C discontinuous is cold to be comprised several controlled rolling and controlled coolings set gradually and recovers section.
4. the preparation technology of a kind of 930MPa high-intensity fine rolling Deformed Steel Bars according to claim 2, is characterized in that: discontinuous control described in step C is cold is that the discontinuous control that recovers after first wearing water three times is cold.
5. the preparation technology of a kind of 930MPa high-intensity fine rolling Deformed Steel Bars according to claim 4, is characterized in that: described first wear water three times after the discontinuous control that recovers is cold is:
The section of recovery after Water cooling for the first time: enter one " 60-80 rice " section of recovery after controlled rolling " 4 meters+4 meters " two Water cooling; The temperature of this section of Water cooling import is 800 ± 20 DEG C, and hydraulic pressure control is 0.40 ± 0.30MPa;
The section of recovery after second time Water cooling: enter one 4 meters of recovery sections after controlled rolling 4 meters of Water cooling and enter one 4 meters of recovery sections again; Cooling water pressure≤the 0.60MPa of this section of Water cooling;
The section of recovery after Water cooling for the third time: enter one 2 meters of recovery sections after controlled rolling 2 meters of Water cooling and enter one 4 meters of recovery sections again; The temperature of this section of Water cooling import is 550 ± 10 DEG C, and hydraulic pressure control is 0.20 ± 0.02MPa.
6. the preparation technology of a kind of 930MPa high-intensity fine rolling Deformed Steel Bars according to claim 2, is characterized in that: adopt the finishing pass sequence of " K4 elliptical aperture+K3 edging pass for rolling+K2 is with the elliptical aperture+K1 finished hole of bottom land convexity " to carry out finish rolling in step B rolling.
7. the preparation technology of a kind of 930MPa high-intensity fine rolling Deformed Steel Bars according to claim 2, is characterized in that: the segmentation of step C Double Dimension Flying Shears adopts " 5# flying shear " segmentation.
8. the preparation technology of a kind of 930MPa high-intensity fine rolling Deformed Steel Bars according to claim 2, is characterized in that: step C cold bed tempering temperature is 650-670 DEG C.
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Denomination of invention: A 930MPa high-strength precision rolled threaded steel and its preparation process Effective date of registration: 20231222 Granted publication date: 20170704 Pledgee: Industrial and Commercial Bank of China Limited Feicheng sub branch Pledgor: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. Registration number: Y2023980073806 |