CN102690937B - Production method of steel for thin-specification sand-spraying-free and shot-blasting-free structure - Google Patents
Production method of steel for thin-specification sand-spraying-free and shot-blasting-free structure Download PDFInfo
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Abstract
The invention provides a production method of steel for a thin-specification sand-spraying-free and shot-blasting-free structure. The production method adopts a sheet billet continuous casting and continuous rolling process of: desulfurizing molten iron, converting by a converter, blowing argon, treating in an LF (ladle furnace), carrying out continuous casting, treating in a soaking furnace, carrying out finish rolling by seven racks, cooling by a laminar flow, coiling, blowing air and cooling, keeping the heat by a heat-preservation cover, and carrying out finishing. The preparation method comprises the specific steps: 1) the surface roughness Ra of a final rack roller of a seven-rack finishing mill is controlled to be 0.8-2.4 microns; 2) the water quality of cooling water for cooling by the laminar flow is controlled to alkalescence and the pH is equal to 7.0-10; 3) a coiling temperature is controlled to be at 580-650 DEG C; and 4) the step of cooling by blowing the air adopts a manner of rapidly cooling at a front section and slowly cooling at a back section: a coiled steel coil is placed at an ventilation convection part or a fan is adopted to increase ventilation convection to cool to 470-500 DEG C by a cooling speed of 2-5 DEG C/min;, then, the steel coil is placed into the steel cover heat-preservation cover to keep heat and is slowly cooled for 30-40 hours, and after the temperature is reduced to 200+/-20 DEG C, the steel coil is taken out and is naturally cooled to a room temperature. The chemical component Si of a continuous casting sheet billet is controlled to 0.05-0.08%.
Description
Technical field
The present invention relates to a kind of thin specification and exempt from the production method of sandblast and Shot Blasting structural steel, belong to the production technical field of hot rolled strip.
Background technology
People produce with the various products, equipment, daily necessities that in life, contact as car crust, guard against error railing, light pole etc. long-term exposure in air, the structural steel material of its use can be subject to the erosion of moisture in environment, gas, microorganism etc., and work and the applied environment on freight container and sea going naval vessel etc. are more severe, it is to prevent that it from corroding that paint spraying is carried out in these structural steel surfaces, extends the important means of its time limit of service.
The coating process of coating is higher to the surface requirements of steel, and degree of cleaning aspect requires its surface can not have residual iron scale, iron rust or other dirts; Based on the consideration of coating adhesion and protective value thereof, require steel surface to there is certain roughness.Therefore before application, generally steel surface is carried out the surface treatments such as sandblast, ball blast or phosphatization.
Taking coatings system system outside the case of freight container as example, its main coating process is as follows:
Coil of strip is opened flat → shearing → sandblast/ball blast → spray shop primer → spray base → spray intermediate coat → topcoating.
Sandblast in this coating process or ball blast operation are the iron scales in order to remove belt steel surface, and provide the surfaceness that is beneficial to coating protection performance.After sandblast or Shot Blasting, painting workshop priming paint is in order to prevent that the steel surface after sandblast or ball blast is oxidized or accumulated impurity again.But this sandblast and ball blast pre-treatment have caused larger dust pollution in process of production, and noise is larger, severe exacerbation operating environment and increased process cost.Therefore, the consideration of manufacturer based on cost efficiency and environmental protection aspect, hope can be carried out and exempt from sandblast and Shot Blasting steel, directly it is carried out to application, and can not cause disadvantageous effect to coating quality, coating performance.
Be similar to this correlation technique of exempting from sandblast or Shot Blasting structural steel and on automotive frame, obtained application.Its principal feature is belt steel surface scale structure and thickness in optimal control course of hot rolling, makes ferric oxide cortex can deform and do not come off with matrix in deep-processing process, does not therefore need by operations such as pickling.This environment-friendly type steel process for treating surface application is mainly reflected in: as Chinese patent " production method of a kind of 510L automotive frame black rust steel ", application number: 201110031827.5, announced the production method of black rust steel for a kind of 510L automotive frame of sheet rolling technical field, Composition Control: C is that 0.06-0.14%, Si are that < 0.2%, Mn are that 1.2-1.6%, P are that < 0.02%, S are that < 0.01%, Nb are that 0.01-0.05%, Alt are 0.02-0.06%.Control slab heating temperature at 1230 ~ 1270 DEG C, be 3 ~ 3.5 hours heat-up time, controls 1040 ~ 1080 DEG C of roughing temperature outs, finish rolling finishing temperature in techniques such as 540 ~ 580 DEG C of 860 ~ 880 DEG C and coiling temperatures.As Chinese patent " production method of environment-friendly high-surface quality and pickling-free beamsteel ", application number: 201010235928.X, announce a kind of production method of environment-friendly high-surface quality and pickling-free beamsteel, produced 510L and the 610L steel for automobile crossbeam plate of exempting from pickling by chemical composition and heating cycle and the steel rolling process etc. of optimizing beam steel.510L chemical composition is that C is that 0.06-0.12%, Si are that 0.05-0.15%, Mn are that 0.50-1.40%, P are that < 0.02%, S are that < 0.01%, Cr are that 0.05-0.25%, Nb are that 0.01-0.04%, Alt are > 0.02%; 610L chemical composition is that C is that 0.06-0.12%, Si are that 0.05-0.15%, Mn are that 1.20-1.70%, P are that < 0.02%, S are that < 0.01%, Cr are that 0.05-0.25%, Nb are that 0.03-0.06%, V are that 0.03-0.06%, Ti are that 0.01-0.02%, Alt are > 0.02%.
Rolling technology control be Heating temperature at 1220 ~ 1300 DEG C, be 3 ~ 3.5 hours heat-up time, controls finish rolling finishing temperature 540 ~ 600 DEG C of 860 ~ 1000 DEG C and coiling temperatures etc.As Chinese patent " 490MPa level is exempted from the production method of pickling hot-rolled steel sheet ", application number: 20101028939.2, announced a kind of 490MPa level and exempted from the production method of pickling hot-rolled steel sheet, its chemical composition is that C is that 0.04-0.11%, Si are that 0.13-0.27%, Mn are that 0.9-1.30%, P are that < 0.027%, S are that < 0.017%, Ti are that 0.004-0.012%, Nb are that 0.013-0.027%, Al are 0.01-0.09%.Billet heating temperature is 1200-1240 DEG C; Hot rolling roughing start rolling temperature 1120-1220 DEG C, finishing temperature 870-910 DEG C, coiling temperature 550-585 DEG C.Document " paddy spring sun-light, time twilight, Zhang Ziyin; the development of hot rolling black surface steel plate 335L for automotive frame; " steel rolling "; 2009; April " production of the beam steel of the black surface of 335L proposed, its chemical composition C be >=0.05%, Si for≤0.30%, Mn for >=0.80%, P for≤0.020%, S for≤0.010%, Nb is >=0.015%, Al is >=0.015%.Billet heating temperature 1180-1250 DEG C, finishing temperature > Ar3,600 DEG C of coiling temperature <.
Before exempting from the paint of pickling beam steel, pretreatment process is generally bonderizing, and different be with it that the surface preparation operation of some structural steels before application is generally sandblast or ball blast, without this phosphatization operation.About steel surface being exempted to sandblast and Shot Blasting, the research of directly carrying out the environment-friendly type process for treating surface aspect of application mainly concentrates on exempts from sandblast technical field of hot and exempts from sandblast coating development research field, it focuses on the research of application techniques and coating aspect and does not consider the improvement of coating object surface appearance, and the scope of application is subject to certain restrictions.Realize the technology of exempting from sandblast and Shot Blasting and there is no at present relevant report by controlling steel product surface appearance.Steel are exempted to sandblast and Shot Blasting needs the densification of steel surface ferric oxide cortex, and clean, its surfaceness is conducive to the application of coating, and iron scale and vanish system have good consistency, does not affect coating properties.Therefore, in structural steel production process, its scale on surface is controlled, making it before application, in pretreatment technology, exempt the operation such as sandblast and ball blast has its technological innovation and practicality.
Oneself is widely used in the industries such as freight container, railway railway carriage, commercial car, home vehicle, household electrical appliances and hardware thin format hot rolled steel plate, it is to " with hot Dai Leng ", significant role has been brought into play in the realization of " with Bao Daihou ", has significant economic benefit and social benefit.Cancel sandblast and ball blast pretreatment process, discharge and the noise pollution of dust while production except having reduced, it also has significant advantage simplifying production process, aspect reducing production costs, according to the production data of certain factory's ball blast operation, pill consumption is 4kg/ ton steel, pill price is 10000 yuan/ton, and the ball blast cost of steel per ton is 40 yuan, can find out that cancel ball blast operation has certain effect aspect cost efficiency.Therefore, under continuous casting and rolling technique of sheet bar condition, producing that the thin specification with fine iron oxide skin performance is exempted from sandblast and Shot Blasting structural steel meets the requirement of country to " energy-saving and emission-reduction ", is very promising technology.
Summary of the invention
The object of the invention is proposed a kind of thin specification and exempt from the production method of sandblast and Shot Blasting structural steel, object is structural steel to be carried out the controls such as chemical composition and technique under continuous casting and rolling technique of sheet bar condition, produce the thin specification framework steel with good oxidation iron sheet performance, in coating process, can be without the sandblast of non-environment-friendly type or ball blast pretreatment technology, directly carry out application and coating quality, coating performance are had no adverse effect, its ferric oxide cortex is combined closely with coat system, has good consistency.
Technical scheme of the present invention: a kind of thin specification of the present invention is exempted from the production method of sandblast and Shot Blasting structural steel, adopting continuous casting and rolling technique of sheet bar flow process: desulfurizing iron → bessemerizing → Argon → LF stove → continuous casting → soaking pit → seven frame finish rolling → laminar flow is cooling → insulation → finishing of batch → quenching → stay-warm case, it is characterized in that:
1) seven frame rack of finishing mill roll surface roughness Ra should be controlled at 0.8 ~ 2.4 μ m;
2) the cooling cooling water quality of laminar flow is controlled at weakly alkaline, pH value=7.0～10;
3) coiling temperature is controlled at 580 DEG C ~ 650 DEG C;
4) quenching adopts leading portion rapid cooling, the mode of back segment slow cooling: batch rear coil of strip and be placed on ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470 ~ 500 DEG C with the cooling rate of 2 ~ 5 DEG C/min, then put into the insulation of coil of strip stay-warm case, after temperature is down to 200 ± 20 DEG C, coil of strip is taken out, naturally cool to room temperature.
Cooling water quality pH value=7.5～8.5 that described laminar flow is cooling.
The described coil of strip stay-warm case insulation slow cooling of putting into is controlled at 30～40 hours, after temperature is down to 200 ± 20 DEG C, coil of strip is taken out, and naturally cools to room temperature.
Described continuous casting steel billet adopts liquid core Reduction Technology, slab thickness is 50mm ~ 70mm, its chemical composition mass percent wt% is controlled at: C :≤0.20%, Si:0.05 ~ 0.08%, Mn:1.0 ~ 1.70%, S :≤0.030%, P :≤0.030%, and all the other are iron and inevitable impurity.
It is 850 DEG C ~ 1050 DEG C that described slab enters stove target temperature range, and slab tapping temperature is controlled at 1150 DEG C ~ 1220 DEG C, and the board briquette of coming out of the stove is even, the maximum temperature difference of slab is no more than ± and 20 DEG C.
Seven described frame finish rolling finishing temperatures are controlled at 850 DEG C ~ 900 DEG C, roll speed 7.0m/s ~ 12.0m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10 ~ 30%, the each frame of finish rolling adopts lubrication and rolling.
Described thin specification is exempted from the production method of sandblast and Shot Blasting structural steel, rolling thickness is that the thin specification of 1.6mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.18%, Si is 0.08%, Mn is 1.25%, S is 0.003%, P is 0.015%, and all the other are iron and inevitable impurity;
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C ~ 1000 DEG C, tapping temperature is at 1150 DEG C ~ 1200 DEG C; Finishing mill control finishing temperature is at 880 DEG C, roll speed 10m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10 ~ 30%, rack of finishing mill roll surface roughness Ra is controlled at 0.8 ~ 1.5 μ m;
The cooling cooling water quality of laminar flow is controlled at pH value 7.2;
Coiling temperature is controlled at 620 DEG C, is cooled to 500 DEG C with the cooling rate of 3.5 DEG C/min, then puts into coil of strip stay-warm case insulation 36 hours, after temperature is down to 200 DEG C ± 20 DEG C, coil of strip is taken out, and naturally cools to room temperature.
Described thin specification is exempted from the production method of sandblast and Shot Blasting structural steel, rolling thickness is that the thin specification of 2.0mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.15%, Si is 0.07%, Mn is 1.28%, S is 0.005%, P is 0.015%, and all the other are iron and inevitable impurity;
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C ~ 1000 DEG C, tapping temperature is at 1150 DEG C ~ 1200 DEG C; Finishing mill control finishing temperature is at 850 DEG C, roll speed 8.5m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10 ~ 30%, rack of finishing mill roll surface roughness Ra is controlled at 1.5 ~ 2.4 μ m;
The cooling cooling water quality of laminar flow is controlled at pH value 8.5;
Coiling temperature is controlled at 580 DEG C, batches that rear to adopt Industrial fan to accelerate to coil of strip cooling, is cooled to 470 DEG C with the cooling rate of 2 DEG C/min, then puts into coil of strip stay-warm case insulation 40 hours, after temperature is down to 200 DEG C of left and right, coil of strip is taken out, and naturally cools to room temperature.
Described thin specification is exempted from the production method of sandblast and Shot Blasting structural steel, rolling thickness is that the thin specification of 1.8mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.17%, Si is 0.05%, Mn is 1.25%, S is 0.005%, P is 0.015%, and all the other are iron and inevitable impurity;
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C ~ 1000 DEG C, tapping temperature is at 1150 DEG C ~ 1200 DEG C; Finishing mill control finishing temperature is at 900 DEG C, roll speed 9.2m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10 ~ 30%, rack of finishing mill roll surface roughness Ra is controlled at 1.0 ~ 1.4 μ m;
The cooling cooling water quality of laminar flow is controlled at pH value 9.0;
Coiling temperature is controlled at 600 DEG C, batch that rear to adopt Industrial fan to accelerate to coil of strip cooling, be cooled to 480 DEG C with the cooling rate of approximately 3 DEG C/min, then put into coil of strip stay-warm case insulation 36 hours, after temperature is down to 200 DEG C of left and right, coil of strip is taken out, naturally cool to room temperature.
Outstanding feature of the present invention and beneficial effect are mainly reflected in:
(1) the thin specification obtaining according to production method provided by the invention is exempted from sandblast and Shot Blasting structural steel, it can cancel sandblast necessary in original coating process and ball blast pretreatment process in use, be directly used in application, reduced discharge and the noise pollution of dust while production; After cancellation sandblast and ball blast pretreatment process, do not need surface of steel plate to carry out the spraying of shop primer, simplified production process, reduced production cost.
(2) the thin specification obtaining according to production method provided by the invention is exempted from sandblast and Shot Blasting structural steel, and its surface is that one deck is with Fe
3o
4for the fine and close iron scale of primary structure, itself and steel matrix bonding force are good, do not come off and have certain corrosion resistance nature in the technological processs such as distortion; In addition, its surfaceness meets the coating specification of coating, has good consistency with coatings system system, to coating performance particularly corrosion resistance nature have no adverse effect.
(3) use of this technology, has responded the call of country's " energy-saving and emission-reduction ", has reduced energy consumption, has significant economic benefit and social benefit.
Embodiment
A kind of thin specification of the present invention is exempted from the production method of sandblast and Shot Blasting structural steel, adopting continuous casting and rolling technique of sheet bar flow process: desulfurizing iron → bessemerizing → Argon → LF stove → continuous casting → soaking pit → seven frame finish rolling → laminar flow is cooling → insulation → finishing of batch → quenching → stay-warm case, the chemical composition mass percent wt% of strand Si is controlled at 0.05 ~ 0.08%, wherein:
1) seven frame rack of finishing mill roll surface roughness Ra should be controlled at 0.8 ~ 2.4 μ m;
2) the cooling cooling water quality of laminar flow is controlled at weakly alkaline, pH value=7.0～10; Preferably 7.2～8.5:
3) coiling temperature is controlled at 580 DEG C ~ 650 DEG C, preferably 580 DEG C ~ 600 DEG C;
4) quenching adopts leading portion rapid cooling, the mode of back segment slow cooling: batch rear coil of strip and be placed on ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470 ~ 500 DEG C with the cooling rate of 2 ~ 5 DEG C/min, then put into the insulation of coil of strip stay-warm case, after temperature is down to 200 ± 20 DEG C, coil of strip is taken out, naturally cool to room temperature.
Embodiment 1:
Rolling thickness is that the thin specification of 1.6mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.18%, Si is 0.08%, Mn is 1.25%, S is 0.003%, P is 0.015%, and all the other are iron and inevitable impurity.
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C ~ 1000 DEG C, tapping temperature is at 1150 DEG C ~ 1200 DEG C; Through the finish rolling horizontal high voltage water de-scaling of advancing, drop into entrance, two groups of descaling headers of outlet, finishing mill control finishing temperature is at 880 DEG C, roll speed 10m/s, front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10 ~ 30%, the each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra is controlled at 0.8 ~ 1.5 μ m.
The cooling type of cooling of laminar flow adopts leading portion rapid cooling, and cooling water quality is controlled at weakly alkaline, pH value 7.2.
Coiling temperature is controlled at 620 DEG C, batch that rear to adopt Industrial fan to accelerate to coil of strip cooling, be cooled to 500 DEG C with the cooling rate of 3.5 DEG C/min, then put into coil of strip stay-warm case insulation 36 hours, after temperature is down to 200 DEG C of left and right, coil of strip is taken out, naturally cool to room temperature.
Under room temperature state, thin specification is exempted to sandblast and the every mechanical performance index of Shot Blasting structural steel is tested, yield strength is 435MPa, and tensile strength is 580MPa, and elongation is 24%, bending its surperficial flawless of inspection.Its scale on surface is tested, and iron scale thickness is 6.5 μ m and even; Scale structure is mainly Fe
3o
4, content is in 85% left and right; Ferric oxide cortex surface roughness Ra is 0.6 ~ 1.0 μ m, and without sandblast, ball blast pre-treatment, the postadhesion of directly painting is good, to follow-up impact briquetting operation and post coat have no adverse effect.
Embodiment 2:
Rolling thickness is that the thin specification of 2.0mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.15%, Si is 0.07%, Mn is 1.28%, S is 0.005%, P is 0.015%, and all the other are iron and inevitable impurity.
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C ~ 1000 DEG C, tapping temperature is at 1150 DEG C ~ 1200 DEG C; Through the finish rolling horizontal high voltage water de-scaling of advancing, drop into entrance, two groups of descaling headers of outlet, finishing mill control finishing temperature is at 850 DEG C, roll speed 8.5m/s, front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10 ~ 30%, the each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra is controlled at 1.5 ~ 2.4 μ m.
The cooling type of cooling of laminar flow adopts leading portion rapid cooling, and cooling water quality is controlled at weakly alkaline, pH value 8.5.
Coiling temperature is controlled at 580 DEG C, batch that rear to adopt Industrial fan to accelerate to coil of strip cooling, be cooled to 470 DEG C with the cooling rate of approximately 2 DEG C/min, then put into coil of strip stay-warm case insulation 40 hours, after temperature is down to 200 DEG C of left and right, coil of strip is taken out, naturally cool to room temperature.
Under room temperature state, thin specification is exempted to sandblast and the every mechanical performance index of Shot Blasting structural steel is tested, yield strength is 415MPa, and tensile strength is 565MPa, and elongation is 26%, bending its surperficial flawless of inspection.Its scale on surface is tested, and iron scale thickness is 7.5 μ m and even; Scale structure is mainly Fe
3o
4, content is in 80% left and right; Ferric oxide cortex surface roughness Ra is 1.0 ~ 1.4 μ m, and without sandblast, ball blast pre-treatment, the postadhesion of directly painting is good, to follow-up impact briquetting operation and post coat have no adverse effect.
Embodiment 3:
Rolling thickness is that the thin specification of 1.8mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.17%, Si is 0.05%, Mn is 1.25%, S is 0.005%, P is 0.015%, and all the other are iron and inevitable impurity.
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C ~ 1000 DEG C, tapping temperature is at 1150 DEG C ~ 1200 DEG C; Through the finish rolling horizontal high voltage water de-scaling of advancing, drop into entrance, two groups of descaling headers of outlet, finishing mill control finishing temperature is at 900 DEG C, roll speed 9.2m/s, front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10 ~ 30%, the each frame of finish rolling adopts lubrication and rolling, and rack of finishing mill roll surface roughness Ra is controlled at 1.0 ~ 1.4 μ m.
The cooling type of cooling of laminar flow adopts leading portion rapid cooling, and cooling water quality is controlled at weakly alkaline, pH value 9.0.
Coiling temperature is controlled at 600 DEG C, batch that rear to adopt Industrial fan to accelerate to coil of strip cooling, be cooled to 480 DEG C with the cooling rate of approximately 3 DEG C/min, then put into coil of strip stay-warm case insulation 36 hours, after temperature is down to 200 DEG C of left and right, coil of strip is taken out, naturally cool to room temperature.
Under room temperature state, thin specification is exempted to sandblast and the every mechanical performance index of Shot Blasting structural steel is tested, yield strength is 415MPa, and tensile strength is 565MPa, and elongation is 26%, bending its surperficial flawless of inspection.Its scale on surface is tested, and iron scale thickness is 7.5 μ m and even; Scale structure is mainly Fe
3o
4, content is in 80% left and right; Ferric oxide cortex surface roughness Ra is 0.8 ~ 1.2 μ m, and without sandblast, ball blast pre-treatment, the postadhesion of directly painting is good, to follow-up impact briquetting operation and post coat have no adverse effect.
Claims (9)
1. a thin specification is exempted from the production method of sandblast and Shot Blasting structural steel, adopting continuous casting and rolling technique of sheet bar flow process: desulfurizing iron → bessemerizing → Argon → LF stove → continuous casting → soaking pit → seven frame finish rolling → laminar flow is cooling → insulation → finishing of batch → quenching → stay-warm case, it is characterized in that:
1) seven frame rack of finishing mill roll surface roughness Ra should be controlled at 0.8～2.4 μ m;
Seven frame finish rolling finishing temperatures are controlled at 850 DEG C～900 DEG C, roll speed 7.0m/s～12.0m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10～30%, the each frame of finish rolling adopts lubrication and rolling;
2) the cooling cooling water quality of laminar flow is controlled at weakly alkaline, pH value=7.0～10;
3) coiling temperature is controlled at 580 DEG C～650 DEG C;
4) quenching adopts leading portion rapid cooling, the mode of back segment slow cooling: batch rear coil of strip and be placed on ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470～500 DEG C with the cooling rate of 2～5 DEG C/min, then put into the insulation of coil of strip stay-warm case, after temperature is down to 200 ± 20 DEG C, coil of strip is taken out, naturally cool to room temperature.
2. thin specification according to claim 1 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: 2) cooling cooling water quality pH value=7.2～8.5 of laminar flow.
3. thin specification according to claim 1 and 2 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: put into coil of strip stay-warm case insulation slow cooling and be controlled at 30～40 hours, after temperature is down to 200 ± 20 DEG C, coil of strip is taken out, naturally cool to room temperature.
4. thin specification according to claim 1 and 2 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: continuous casting steel billet adopts liquid core Reduction Technology, slab thickness is 50mm～70mm, its chemical composition mass percent wt% is controlled at: C :≤0.20%, Si:0.05～0.08%, Mn:1.0～1.70%, S :≤0.030%, P :≤0.030%, and all the other are iron and inevitable impurity.
5. thin specification according to claim 3 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: continuous casting steel billet adopts liquid core Reduction Technology, slab thickness is 50mm～70mm, its chemical composition mass percent wt% is controlled at: C :≤0.20%, Si:0.05～0.08%, Mn:1.0～1.70%, S :≤0.030%, P :≤0.030%, and all the other are iron and inevitable impurity.
6. thin specification according to claim 1 and 2 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: it is 850 DEG C～1050 DEG C that slab enters stove target temperature range, slab tapping temperature is controlled at 1150 DEG C～1220 DEG C, the board briquette of coming out of the stove is even, and the maximum temperature difference of slab is no more than ± and 20 DEG C.
7. thin specification according to claim 1 and 2 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: the thin specification that rolling thickness is 1.6mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.18%, Si is 0.08%, Mn is 1.25%, S is 0.003%, P is 0.015%, and all the other are iron and inevitable impurity;
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C～1000 DEG C, tapping temperature is at 1150 DEG C～1200 DEG C; Finishing mill control finishing temperature is at 880 DEG C, roll speed 10m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10～30%, rack of finishing mill roll surface roughness Ra is controlled at 0.8～1.5 μ m;
The cooling cooling water quality of laminar flow is controlled at pH value 7.2;
Coiling temperature is controlled at 620 DEG C, is cooled to 500 DEG C with the cooling rate of 3.5 DEG C/min, then puts into coil of strip stay-warm case insulation 36 hours, after temperature is down to 200 DEG C ± 20 DEG C, coil of strip is taken out, and naturally cools to room temperature.
8. thin specification according to claim 1 and 2 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: the thin specification that rolling thickness is 2.0mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.15%, Si is 0.07%, Mn is 1.28%, S is 0.005%, P is 0.015%, and all the other are iron and inevitable impurity;
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C～1000 DEG C, tapping temperature is at 1150 DEG C～1200 DEG C; Finishing mill control finishing temperature is at 850 DEG C, roll speed 8.5m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10～30%, rack of finishing mill roll surface roughness Ra is controlled at 1.5～2.4 μ m;
The cooling cooling water quality of laminar flow is controlled at pH value 8.5;
Coiling temperature is controlled at 580 DEG C, batches that rear to adopt Industrial fan to accelerate to coil of strip cooling, is cooled to 470 DEG C with the cooling rate of 2 DEG C/min, then puts into coil of strip stay-warm case insulation 40 hours, after temperature is down to 200 DEG C, coil of strip is taken out, and naturally cools to room temperature.
9. thin specification according to claim 1 and 2 is exempted from the production method of sandblast and Shot Blasting structural steel, it is characterized in that: the thin specification that rolling thickness is 1.8mm is exempted from sandblast and Shot Blasting structural steel, after employing Liquid Core Reduction, continuous casting steel billet thickness is 60mm, its chemical composition mass percent wt%:C is 0.17%, Si is 0.05%, Mn is 1.25%, S is 0.005%, P is 0.015%, and all the other are iron and inevitable impurity;
Slab enters Soaking Pit Temperature and is controlled at: 950 DEG C～1000 DEG C, tapping temperature is at 1150 DEG C～1200 DEG C; Finishing mill control finishing temperature is at 900 DEG C, roll speed 9.2m/s, and front 3 frame percentage pass reduction >=30%, rear 4 frame percentage pass reductions 10～30%, rack of finishing mill roll surface roughness Ra is controlled at 1.0～1.4 μ m;
The cooling cooling water quality of laminar flow is controlled at pH value 9.0;
Coiling temperature is controlled at 600 DEG C, batches that rear to adopt Industrial fan to accelerate to coil of strip cooling, is cooled to 480 DEG C with the cooling rate of 3 DEG C/min, then puts into coil of strip stay-warm case insulation 36 hours, after temperature is down to 200 DEG C, coil of strip is taken out, and naturally cools to room temperature.
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| CN109440007B (en) * | 2018-11-27 | 2020-09-01 | 唐山不锈钢有限责任公司 | Thin-gauge high-performance ultrahigh-strength semi-hard steel strip and production method thereof |
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| CN1978688A (en) * | 2005-12-06 | 2007-06-13 | 鞍钢股份有限公司 | Hot-rolled black skin surface steel plate with firmly adhered oxide layer and manufacturing method thereof |
| CN101670372A (en) * | 2009-09-25 | 2010-03-17 | 首钢总公司 | Method for eliminating defect of strip shape of hot-rolled high-strength steel |
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| CN101906584A (en) * | 2010-07-22 | 2010-12-08 | 首钢总公司 | Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel |
| CN101956125A (en) * | 2010-08-10 | 2011-01-26 | 武汉钢铁(集团)公司 | Flexible manufacture method of steel in thin gauge, low alloy and high tensity series |
| CN102172622A (en) * | 2011-01-29 | 2011-09-07 | 首钢总公司 | Production method of black steel for 510L automobile frame |
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| CN1978688A (en) * | 2005-12-06 | 2007-06-13 | 鞍钢股份有限公司 | Hot-rolled black skin surface steel plate with firmly adhered oxide layer and manufacturing method thereof |
| CN101670372A (en) * | 2009-09-25 | 2010-03-17 | 首钢总公司 | Method for eliminating defect of strip shape of hot-rolled high-strength steel |
| CN101818299A (en) * | 2010-04-30 | 2010-09-01 | 武汉钢铁(集团)公司 | High-strength thin-specification direct-plating steel based on thin slab casting and rolling process and making method thereof |
| CN101906584A (en) * | 2010-07-22 | 2010-12-08 | 首钢总公司 | Production method of environment-friendly high-surface-quality acid-cleaning-free automobile beam steel |
| CN101956125A (en) * | 2010-08-10 | 2011-01-26 | 武汉钢铁(集团)公司 | Flexible manufacture method of steel in thin gauge, low alloy and high tensity series |
| CN102172622A (en) * | 2011-01-29 | 2011-09-07 | 首钢总公司 | Production method of black steel for 510L automobile frame |
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