CN103173682B - Hot rolled strip for conveying concrete and manufacturing method thereof - Google Patents
Hot rolled strip for conveying concrete and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a hot rolled strip for conveying concrete and a manufacturing method of the hot rolled strip. The hot rolled strip comprises the following ingredients in mass percentage (%): 0.60-0.70% of C, 0.12-0.37% of Si, 0.90-1.20% of Mn, 0.015-0.06% of Al, not more than 0.035 of P, not more than 0.035 of S, 0.20-0.50% of Cr, not more than 0.025 of V, and the balance of Fe and unavoidable impurity elements. The technology of the preparation method comprises molten iron pretreatment, converter smelting, external refining, slab continuous casting, infrared direct loading, slab heating, high pressure water descaling, rolling by a roughing mill group, high pressure water descaling, rolling by a finishing mill group, reeling, quality and performance inspection, packaging and labeling, and putting in storage; and a second method comprises molten iron pretreatment, converter smelting, external refining, slab continuous casting, slab annealing, slab heating, high pressure water descaling and rolling by a roughing mill group. The concrete conveying capacity of the hot rolled strip in service life is more than 70000m<3>.
Description
Technical field
The present invention relates to the effective hot rolled strip of a kind of concrete conveyance and manufacture method thereof, is namely a kind of effective hot rolled strip of concrete conveyance and manufacture method thereof with high-wearing feature.
Technical background
Conveying throughout industries such as electric power, metallurgy, coal, oil, chemical industry, building materials, machineries, and develops at high speed.When the material carrying grindability large in abrasion-proof pipe (as lime-ash, coal dust, tantalite power, mine tailing, cement etc.), all there is the problem of an abrasion-proof pipe quick abrasion.When conveying in abrasion-proof pipe has gas, the liquid or solid of strong corrosion, there is abrasion-proof pipe and be corroded and the problem destroyed very soon.When conveying in abrasion-proof pipe has the material of comparatively high temps, there is the problem using heat resisting pipe price very expensive.Concrete delivery pump pipe road common name pump line, because concrete is called for short concrete, therefore is often called concrete pump line.
At present, widely used concrete delivery pump pipe road intensity is low, wear no resistance, the life-span is short, and the life-span, domestic common level was only 10000-20000m
3, advanced international level is 40000m
3, advanced international standard is 60000-70000 m
3, and domesticly generally select with low cost, that the life-span is short material, this act-short-view, cause huge waste undoubtedly, be also unfavorable for technical progress, let alone low-carbon environment-friendly.
Summary of the invention
The invention provides a kind of have the long lifetime, high-wearing feature, high strength, good welding property,
The effective hot rolled strip of concrete conveyance of good corrosion resistance, provides a kind of manufacture method of this hot rolled strip simultaneously.
For achieving the above object, technical scheme of the present invention is: with C, Si, Mn, Al for main alloy element, with Cr, V for alloy element.By the control of temperature drop after liquid steel refining, continuous casting control, the control of slab crackle, type of heating, rolling mode, the type of cooling, Heating temperature, roughing temperature, finishing temperature, coiling temperature and rolling, obtain the hot rolled strip of premium properties, it is organized as perlite and ferrite.
The invention provides the effective hot-rolled coil of a kind of concrete conveyance, the mass percent of its chemical composition is:
C：0.60～0.70；Si：0.12～0.37；Mn：0.90～1.20；Al：0.015-0.06；P≤0.035； S：≤0.035； Cr：0. 20～0.50；V：≤0.25；
Surplus is Fe and inevitable impurity element.
Its mechanical property is as follows:
Its tensile strength Rm>=600Mpa, yield strength is R
p0.2>=350 Mpa, elongation A %>=15, hardness HB≤350, practical decarburized depth is not more than 1.1% of belt steel thickness.Meet the performance requirement of concrete delivery pipe to hot rolled strip of any dimensions.
Producible dimensions is:
Roll bending thickness 2.0 ~ 25.4mm, wide 1000 ~ 2130mm.
In the effective hot-rolled coil of a kind of concrete conveyance of the present invention and manufacture method thereof, the cause that each composition is determined is as follows:
Carbon: be strengthening element most economical, the most basic in steel, therefore, this patent C content controls within the scope of 0.60-0.70%.
Silicon: suitable silicone content, to improving, the formability of steel, weldability, toughness and plasticity are favourable, and therefore, this patent Si content controls within the scope of 0.12-0.37%.
Manganese: add appropriate Mn, (1) can improve the hardening capacity of steel, produces the effect of solution strengthening; (2) significant effect is had to the intensity of carbon perlitic steel in raising.(3) the high-temperature instantaneous intensity of steel can be improved.
But the main drawback of manganese steel is; 1. Mn content exceedes a certain amount of, then easily produce segregation, forms banded structure; 2. containing manganese higher time, have obvious temper brittleness phenomenon; 3. manganese has the effect promoting grain growth, and therefore manganese steel is to overheated more responsive, and thermal treatment process must be noted that.This shortcoming can overcome with adding crystal grain thinning element such as vanadium etc.: 4. when the massfraction of manganese is more than 1%, the welding property of steel can be made to degenerate; 5. manganese can make the corrosion-resistant property of steel reduce.Therefore, this patent Mn content controls within the scope of 0.90-1.20%.
Aluminium: aluminium is main deoxidant element in steel and solid N element, and crystal grain thinning, improves the toughness of steel when low temperature, particularly reduce the brittle transition temperature of steel; But as too much by aluminum amount during deoxidation, will the greying tendency of steel be promoted.And when containing aluminium higher time. its hot strength and toughness lower.Therefore, this patent Al content controls at 0.015-0.06%.
Phosphorus: be inevitable impurity element in steel, phosphorus easily produces segregation, more low better.Therefore, this patent P content controls≤0.035%.
Sulphur: be the element be extremely harmful to, this patent S content controls≤0.035 %.
Chromium: chromium can improve the intensity of steel, hardness, high-temperature mechanical property and hardening capacity, makes steel have good erosion resistance and oxidation-resistance, has simultaneously and stops graphited effect.But chromium significantly improves the brittle transition temperature of steel, promote steel belt roof bolt fragility.Therefore, this patent Cr content control 0.20-0.50%.
Vanadium: be carbide, can obtain the fine and close steel that deoxidation dehydrogenation is good, and all right crystal grain thinning, reduces superheated susceptivity, improves obdurability and the fatigue property of steel.The carbide of V is almost the hardest and the most wear-resisting in all metallic carbide, the V of Dispersed precipitate
4c
3hardness and the wear resistance of steel will be improved.Therefore, this patent V content controls≤0.25%.
The present invention proposes the manufacture method of the effective hot-rolled coil of a kind of concrete conveyance, and its process procedure is: hot metal pretreatment → converter smelting → external refining → sheet billet continuous casting → red send straight dress or slab annealing → heating of plate blank → high-pressure water descaling → roughing mills rolling → high-pressure water descaling → finishing train rolling → batch → quality and performance inspection → packing mark → warehouse-in; It is characterized in that in LF refining, by the molten steel desulfurizing after converter smelting to S≤0.004%; In RH refining, after vacuum outgas vacuum breaker, Ca process is carried out, to inclusion modification to molten steel; In sheet billet continuous casting, continuous casting temperature: 1485-1535 DEG C; Pulling speed of continuous casting :≤1.5m/min; Molten steel overheat: 15 DEG C-50 DEG C; Strand slighter compress: 2-3.5mm; Induction stirring: frequency 2.5-2.7Hz; Mould flux: fluxing point is 1050 ± 40 DEG C, viscosity is 1300 DEG C, 0.5 ± 0.05 pool; Send in straight dress slab is red, red the sending of slab directly fills temperature >=150 DEG C; In heating of plate blank, slab heating temperature: 1230 DEG C ~ 1280 DEG C; In roughing mills rolling, roughing mills final temperature: 1030 DEG C ~ 1180 DEG C, middle made-up belt thickness: 25 ~ 60mm; In finishing train rolling, finishing train final temperature: 820 DEG C ~ 930 DEG C; In batching, steel strip coiling temperature: 650 DEG C ~ 820 DEG C.
Described slab annealing temperature: 650-850 DEG C.
Described hot metal pretreatment is clean by skimming during hot metal pretreatment, after hot metal pretreatment, the S in molten iron is reduced to S≤0.005%.；
Described converter smelting adds in converter by preprocessed molten iron, the steel scrap ([S]≤0.03%) of meet converter smelting 80 ~ 95%; During converter tapping, molten steel per ton adds carbon dust 5 ~ 8 Kg, molten steel per ton adds ferro-aluminum 5 ~ 7 Kg, add high carbon ferromanganese alloy, silicomanganese and ferrochrome, wherein carbon-manganese alloy 6 ~ 9.5Kg increased by molten steel per ton, molten steel per ton adds silicomanganese 5 ~ 8Kg, and molten steel per ton adds ferrochrome 2 ~ 5 Kg.
Described ferro-aluminum grade is Al:36-46%; Ferrochrome grade is Cr >=65%; High carbon ferromanganese grade is Mn >=80%; Silicomanganese grade is Si >=18%, Mn >=65%;
Add lime during described LF refining, molten steel per ton adds lime 4 ~ 8Kg and takes off S, is taken off by S to being not more than 0.004%, and afterwards, add V iron, Cr iron microalloying, wherein molten steel per ton adds vanadium iron 0.2 ~ 5.9Kg, ferrochrome 2 ~ 5Kg; And be not less than 5 minutes with BOTTOM ARGON BLOWING flow 20 ~ 200NL/ min weak time of stirring.
In described Si-Ca core powder, Ca content is 25-35%; Vanadium iron grade is V >=65%; Ferrochrome grade is Cr >=65%;
In described RH refining, under Vacuum Pressure intensity values is not more than 10mbar state, be not less than 10 minutes cycling time; After vacuum breaker, carry out Ca process to molten steel, to inclusion modification, the soft churning time of BOTTOM ARGON BLOWING is not less than 7 minutes;
Through assay, the composition by weight percent of molten steel is:
C：0.60～0.70 Si：0.12～0.37 Mn：0.90～1.20 Al：0.015-0.060 P≤0.035； S：≤0.035 Cr：0. 20～0.50 V：≤0.25
Sheet billet continuous casting
inmolten steel in ladle is joined in tundish; by crystallizer, continuous casting becomes slab, and continuously cast bloom pulling rate is not higher than 1.5m/min; continuous casting temperature; 1485-1535 DEG C, strand slighter compress: 2.0mm, molten steel overheat: 15 DEG C-50 DEG C; induction stirring: frequency 2.5-2.7Hz; mould flux: fluxing point is 1050 ± 40 DEG C, viscosity is 1300 DEG C, 0.5 ± 0.05 pool.
In roughing mills rolling, slab is become middle made-up belt through 5 ~ 7 passage reversible rollings on roughing mills, final temperature, 1030 DEG C.
The effective hot-rolled coil of concrete conveyance of the present invention, As rolled is perlite+ferritic structure.After quenching, HBW hardness fluctuations is less than 1.5%, and surface of steel plate decarburized layer deepness is less than 1.1% of steel plate thickness.
What the present invention manufactured is the concrete delivery pump pipe in a kind of high work-ing life, and its work-ing life is that concrete conveyance amount reaches 70000 m
3above.
The effective hot-rolled coil of concrete conveyance of the present invention, its yield strength is >=350 Mpa, tensile strength Rm >=600Mpa, elongation A % >=15, and hardness HBW≤350, practical decarburized depth is not more than 1.1% of belt steel thickness.Meet the performance requirement of concrete delivery pipe to hot rolled strip of any dimensions.
Below the manufacture method mechanism of the effective hot-rolled coil of a kind of concrete conveyance of the present invention is described.
After ensureing concrete conveyance effective hot-rolled coil tubulation, there is good corrosion resistance in the present invention, strict demand is had to the control of S content, high-quality steel scrap need be selected, most slag is taken off during hot metal pretreatment, hot metal pretreatment is to S≤0.005%, enter converter smelting, the dark desulfurization of rear employing LF, takes off to S≤0.004%.For ensureing purity of steel, need RH Fruit storage be carried out, after vacuum breaker, also Ca process be carried out, to inclusion modification to molten steel.
For ensureing purity of steel in the present invention, continuously cast bloom pulling rate is not higher than 1.5m/min.Slab heating temperature controls at 1230 DEG C-1280 DEG C; Rolling technology is roughing final temperature 1030-1180 DEG C, middle made-up belt thickness: 25-60mm; Finish rolling final temperature 820-930 DEG C; Steel strip coiling temperature 650-820 DEG C.What the effective hot-rolled coil of concrete conveyance that present method is produced obtained is organized as perlite and ferrite.
In sum, the present invention has following characteristics:
1, the present invention is by adopting external refining: the dark desulfurization of LF+RH vacuum outgas, Ca process nodularization inclusion technology obtain pure steel; Control to smelt each node temperature, adopt slighter compress and electromagnetic agitating technology, control nitrogen content, optimize cooling twice water model, effectively prevent the generation of chink; Develop mould flux, avoid the uneven fusing of covering slag caused because teeming temperature is low, pouring speed is low, thus make steel slab surface occur the problem of slag inclusion and pore.Develop hot delivery and hot charging or annealing process, effectively control from steel making working procedure in hot-rolled process process, the problem of slab crackle may be caused.Obtain and have that steel is pure, homogeneous microstructure, Decarburized layer are extremely low, the effective hot-rolled coil of concrete conveyance that is excellent surface quality.
2, the effective hot-rolled coil of concrete conveyance of the present invention has excellent over-all properties, high strength,
High-wearing feature, high tenacity, long lifetime, practical decarburized depth are thin and have the feature of good welding property, good corrosion resistance, the yield strength of its As rolled is >=350 Mpa, tensile strength Rm >=600Mpa, elongation A % >=15, hardness HBW≤310, practical decarburized depth is not more than 1.1% of belt steel thickness.
3, the effective hot rolled strip of concrete conveyance of the present invention adopts heat+controlled rolling process to produce, and the As rolled of acquisition is organized as perlite and ferritic structure.
4, the effective hot rolled strip of concrete conveyance of the present invention, has excellent uniformity of hardness, long service life after quench treatment, is applicable to the use of concrete delivery pipe.
5, hot-rolled coil of the present invention meets the service requirements of strong concrete conveying tube steel, and work-ing life, concrete conveyance amount reached 70000 m
3above.
Therefore; the present invention, by made-up belt thickness, finish rolling finishing temperature, coiling temperature in the middle of the crackle control techniques of chemical composition, external refining, slighter compress and electromagnetic agitating technology, mould flux, continuous casting control techniques, slab hot delivery and hot charging or annealing process, Heating temperature, roughing finishing temperature, roughing outlet, obtains desired tissue and the performance of the effective hot-rolled coil of a kind of concrete conveyance.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment
embodiment one
The technical characteristic of roll bending of the present invention is described below in detail with the present embodiment.The mass percent of the chemical composition of the effective hot-rolled coil of concrete conveyance of the present embodiment is:
C：0.60 Si：0.25 Mn：1.05 P：0.011 S：0.002 Al：0.022
Cr：0.35 V：0.20 N：0.003
Surplus is Fe and inevitable impurity element.
The thick 3.2mm of roll bending of the present embodiment, wide 1700mm, long 708.8 m.
The yield strength of its As rolled is 680 Mpa, and tensile strength is 1000Mpa, and elongation is 20%, hardness HBW 300, practical decarburized depth 0.01 mm.Meet the performance requirement of concrete delivery pipe to hot rolled strip.
The present embodiment carries out on 180 tons of top and bottom combined blown converters and 2250mm hot tandem, and it comprises following step successively:
ihot metal pretreatment
Skim during hot metal pretreatment clean, after hot metal pretreatment, the S in molten iron is taken off to 0.005%;
iIconverter smelting
By meet converter smelting preprocessed molten iron 170 tons, steel scrap ([S]≤0.03%) 30 tons, add in converter.During converter tapping, during converter tapping, molten steel per ton adds carbon dust 6 Kg, and molten steel per ton adds ferro-aluminum 5Kg, adds high carbon ferromanganese, silicomanganese, Cr iron alloy, and molten steel per ton adds high carbon ferromanganese 7.9Kg and silicomanganese 6.2Kg, Cr iron 2.5 Kg.After hot metal pretreatment, converter smelting, molten steel composition reaches following compositions mass percent, can tap.
C：0.55 Si：0.18 Mn：1.01 P：0.012 S：0.008 Cr：0.15 Al：0.051
Surplus is Fe and inevitable impurity element.
Converter terminal temperature: 1650 DEG C.
Send Argon station to carry out Argon process after tapping, blowing argon gas flow 220NL/min, carries out stir process.
Go out Argon station composition:
C：0.57 Si：0.20 Mn：1.03 P：0.013 S：0.010 Cr：0.15 Al：0.051
Surplus is Fe and inevitable impurity element.
Go out Argon station temperature: 1573 DEG C.
iIIlF refining
After hot metal pretreatment, converter smelting, Argon process, furnaceman's LF sequence will be entered:
LF adds quantitative sweetening agent Wingdale 920Kg, is taken off by S to 0.0013%, and after desulfurization terminates, molten steel per ton adds V iron 4.8Kg, Cr iron 2.2Kg microalloying, fine setting composition.And stir 10 minutes time so that BOTTOM ARGON BLOWING flow 80NL/ min is weak.
The mass percent of molten steel composition reaches following values:
C：0.60 Si：0.26 Mn：1.05 P：0.011 S： 0.008 Al：0.018
Cr：0.35 V：0.22 N：0.007
Surplus is Fe and inevitable impurity element.
Out-station temperature 1600 DEG C.
iVrH refining
Under Vacuum Pressure intensity values 6mbar state, circulate 30 minutes.After vacuum breaker, feeding 380mCa-Si line, weak stirring afterwards 10 minutes, argon flow amount 100NL/min, carries out Ca process to molten steel, carries out inclusions class.
The weight percent of molten steel composition is:
C：0.60 Si：0.25 Mn：1.05 P：0.011 S：0.002 Al：0.022
Cr：0.35
V：0.20 N：0.003
Surplus is Fe and inevitable impurity element.
vsheet billet continuous casting
Join in tundish by the molten steel in ladle, by crystallizer, continuous casting becomes slab, continuously cast bloom pulling rate 1.4m/min; continuous casting temperature 1525 DEG C, strand slighter compress: 2.0mm, induction stirring: frequency 2.5Hz; mould flux: fluxing point is 1010 DEG C, viscosity is 1300 DEG C, 0.45 pool.
Slab specification: thickness 200mm, width 1730mm, length 11065mm;
Slab quantity: 6 pieces;
vIslab is red send straight dress or slab annealing
Slab is red send straight dress: slab is red send straight dress temperature 160 DEG C.
Slab annealing temperature: 650 DEG C.
vIIheating of plate blank
Heated in walking beam furnace by slab, heat-up time is 150min, Heating temperature 1230 DEG C.
vIIIroughing high-pressure water descaling
The slab of heating is removed the iron scale of billet surface generation by roughing high-pressure water descaling.
Ⅸroughing mills rolling
By slab in four roller reversible roughing mills reciprocal rolling 7 passage, be rolled into thickness 40mm, the middle made-up belt of width 1715mm, length 55808mm, roughing finishing temperature: 1080 DEG C.
Ⅹfinish rolling high-pressure water descaling
Before finish rolling, by the secondary oxidation iron sheet on made-up belt surface in the middle of the removing of finish rolling high-pressure water descaling case.
Ⅺfinishing train rolling
Slab is made thickness 3.2mm in 7 frame finishing train, width 1700mm, length 709m
Steel band, finishing train finishing temperature: 840 DEG C.
Ⅻbatch
With 3 Wrapping Roll all-hydraulic moving formula reeling machines, at 680 DEG C of temperature, be rolled into coil of strip.
through quality and performance inspection, the assay of the present embodiment is as follows:
It is as follows that it can reach mechanical property:
The yield strength of its As rolled is 680 Mpa, and tensile strength is 1000Mpa, and elongation is 20%, hardness HBW 300, practical decarburized depth 0.01 mm.
To packing mark be pasted before dispatching from the factory and put in storage.
other embodiment of hot-rolled coil manufacture method
The composition of other embodiment of hot-rolled coil is in table 2
The composition of other embodiment of table 2 hot-rolled coil
| Composition embodiment | C | Si | Mn | P | S | AL | Cr | V |
| Example I | 0.60 | 0.25 | 1.05 | 0.011 | 0.002 | 0.022 | 0.35 | 0.20 |
| Example II | 0.62 | 0.24 | 1.16 | 0.010 | 0.003 | 0.016 | 0.45 | 0.13 |
| Example III | 0.65 | 0.21 | 0.98 | 0.012 | 0.004 | 0.025 | 0.33 | 0.15 |
| Example IV | 0.68 | 0.21 | 0.96 | 0.010 | 0.004 | 0.017 | 0.30 | 0.12 |
| Example V | 0.70 | 0.20 | 0.93 | 0.013 | 0.002 | 0.020 | 0.23 | 0.07 |
The processing parameter of other manufacture method embodiment of hot-rolled coil and roll bending performance are in table 3
The processing parameter of other manufacture method embodiment of table 3 hot-rolled coil and roll bending performance (As rolled)
The above embodiment of the present invention, it is not that the present invention can also have other embodiment for limiting the present invention, and all employings are equal to the technical scheme that replacement or equivalent transformation are formed, and all drops within protection domain that the claims in the present invention define.
Claims (1)
1. the effective hot rolled strip of concrete conveyance, the mass percent of its chemical composition is:
C：0.60 Si：0.25 Mn：1.05 P：0.011 S：0.002 Al：0.022
Cr：0.35 V：0.20 N：0.003
Surplus is Fe and inevitable impurity element;
The thick 3.2mm of roll bending, wide 1700mm, long 708.8 m;
The yield strength of its As rolled is 680 MPa, and tensile strength is 1000MPa, and elongation is 20%, hardness HBW 300, practical decarburized depth 0.01 mm;
Its manufacture method comprises following step successively:
(1)hot metal pretreatment
Skim during hot metal pretreatment clean, after hot metal pretreatment, the S in molten iron is taken off to 0.005%;
(2)converter smelting
By meet the preprocessed molten iron 170 tons of converter smelting, [S]≤0.03% steel scrap 30 tons, add in converter; During converter tapping, during converter tapping, molten steel per ton adds carbon dust 6 kg, and molten steel per ton adds ferro-aluminum 5kg, adds high carbon ferromanganese, silicomanganese, Cr iron alloy, and molten steel per ton adds high carbon ferromanganese 7.9kg and silicomanganese 6.2kg, Cr iron 2.5 kg; After hot metal pretreatment, converter smelting, molten steel composition mass percent is C:0.55, Si:0.18, Mn:1.01, P:0.012, S:0.008, Cr:0.15, Al:0.051, and surplus is Fe and inevitable impurity element; Tapping;
Converter terminal temperature: 1650 DEG C;
Send Argon station to carry out Argon process after tapping, blowing argon gas flow 220NL/min, carries out stir process;
Going out Argon station Ingredient percent is:
C:0.57, Si:0.20, Mn:1.03, P:0.013, S:0.010, Cr:0.15, Al:0.051, surplus is Fe and inevitable impurity element;
(3)lF refining
After hot metal pretreatment, converter smelting, Argon process, furnaceman's LF sequence will be entered:
LF adds quantitative sweetening agent Wingdale 920kg, is taken off by S to 0.0013%, and after desulfurization terminates, molten steel per ton adds V iron 4.8kg, Cr iron 2.2kg microalloying, fine setting composition; And stir 10 minutes time so that BOTTOM ARGON BLOWING flow 80NL/ min is weak;
The mass percent of molten steel composition:
C：0.60 ， Si：0.26 ， Mn：1.05， P：0.011， S： 0.008， Al：0.018，
Cr:0.35, V:0.22, N:0.007, surplus is Fe and inevitable impurity element;
Out-station temperature 1600 DEG C;
(4)rH refining
Under Vacuum Pressure intensity values 6mbar state, circulate 30 minutes; After vacuum breaker, feeding 380mCa-Si line, weak stirring afterwards 10 minutes, argon flow amount 100NL/min, carries out Ca process to molten steel, carries out inclusions class;
The weight percent of molten steel composition is:
C：0.60 ， Si：0.25， Mn：1.05， P：0.011 ， S：0.002 ， Al：0.022，
Cr:0.35,
v: 0.20, N:0.003, surplus is Fe and inevitable impurity element;
(5)sheet billet continuous casting
Join in tundish by the molten steel in ladle, by crystallizer, continuous casting becomes slab, continuously cast bloom pulling rate 1.4m/min, continuous casting temperature 1525 DEG C, strand slighter compress: 2.0mm, induction stirring: frequency 2.5Hz, mould flux: fluxing point is 1010 DEG C, viscosity is 1300 DEG C, 0.45 pool;
Slab specification: thickness 200mm, width 1730mm, length 11065mm;
Slab quantity: 6 pieces;
(6)slab is red send straight dress or slab annealing
Slab is red send straight dress: slab is red send straight dress temperature 160 DEG C;
Slab annealing temperature: 650 DEG C;
(7)heating of plate blank
Heated in walking beam furnace by slab, heat-up time is 150min, Heating temperature 1230 DEG C;
(8)roughing high-pressure water descaling
The slab of heating is removed the iron scale of billet surface generation by roughing high-pressure water descaling;
(9)roughing mills rolling
By slab in four roller reversible roughing mills reciprocal rolling 7 passage, be rolled into thickness 40mm, the middle made-up belt of width 1715mm, length 55808mm, roughing finishing temperature: 1080 DEG C;
(10)finish rolling high-pressure water descaling
Before finish rolling, by the secondary oxidation iron sheet on made-up belt surface in the middle of the removing of finish rolling high-pressure water descaling case;
(11)finishing train rolling
Slab is made thickness 3.2mm in 7 frame finishing train, width 1700mm, length 709m
Steel band, finishing train finishing temperature: 840 DEG C;
(12)batch
With 3 Wrapping Roll all-hydraulic moving formula reeling machines, at 680 DEG C of temperature, be rolled into coil of strip;
The yield strength of coil of strip As rolled is 680 MPa, and tensile strength is 1000MPa, and elongation is 20%, hardness HBW 300, practical decarburized depth 0.01 mm.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086495A (en) * | 2010-12-22 | 2011-06-08 | 山西太钢不锈钢股份有限公司 | Production method of oxide film hot-rolled strip steel with high adhesion |
| CN102373383A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | X70 pipeline steel hot rolled coil and manufacture method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4650006B2 (en) * | 2004-03-10 | 2011-03-16 | Ｊｆｅスチール株式会社 | High carbon hot-rolled steel sheet excellent in ductility and stretch flangeability and method for producing the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102086495A (en) * | 2010-12-22 | 2011-06-08 | 山西太钢不锈钢股份有限公司 | Production method of oxide film hot-rolled strip steel with high adhesion |
| CN102373383A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | X70 pipeline steel hot rolled coil and manufacture method thereof |
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