CN102691004B - Production method for treating weathering steel for containers without sand blasting or shot blasting - Google Patents
Production method for treating weathering steel for containers without sand blasting or shot blasting Download PDFInfo
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Abstract
The invention provides a production method for treating weathering steel for containers without sand blasting or shot blasting. The production method adopts the following hot rolling process flow: heating with a heating furnace, rough rolling, finish rolling, laminar cooling, coiling, air blast cooling, insulating with an insulation cover and finishing. The production method is characterized in that the initial rolling temperature of a finishing mill is controlled between 950 DEG C and 1020 DEG C, the finishing rolling temperature is controlled between 850 DEC C and 900 DEC C, the rolling speed is more than 5.5m/s and each finish rolling stand adopts lubricating rolling; the surface roughness Ra of the roller of the stand at the tail of the finishing mill is controlled between 0.8mu m and 2.4mu m; front-section rapid cooling is adopted on the laminar cooling stage, the cooling water is controlled to be alkalescent and the PH value is 7.0-10; the coiling temperature is controlled between 550 DEG C and 620 DEG C; the steel coil after coiling is put in the ventilative and convective place or a fan is adopted to improve ventilation and convection to cool the steel coil to 460-500 DEG C at a speed of 2-5 DEG C/min; then the steel coil is put into the insulation cover to be insulated, is taken out after the temperature drops to 200+/-20 DEG C and is naturally cooled to the room temperature; and the chemical component Si of the adopted slab is controlled between 0.20% and 0.25%.
Description
Technical field
The present invention relates to a kind of production method of exempting from sandblast and Shot Blasting freight container use weathering steel, belong to the production technical field of hot rolled strip.
Background technology
Encased conveying has the advantages such as safe, rapid, is particularly suitable for transporting that added value is high, the goods of easy collision, and therefore, container manufacture has obtained greatly development.Steel for container requires steel used to have good corrosion resistance nature, higher mechanical property, good processability.Weathering steel is weather resisting steel, is characterized in adding the alloying elements such as Cu, P, Cr, Ni in steel, makes it have good corrosion resistance nature in atmosphere.With carbon steel, compare, weathering steel weather-resistance and coating are all very outstanding, therefore in the Production Container field, have obtained a large amount of application.
The work of freight container and applied environment very severe: the temperature variation of-40 ℃ ~ 70 ℃; Wind and weather; The erosion of high salinity marine atmosphere and sea washes; Corrosion of various corrosive gasess and dust, impurity etc. in city, industrial atmosphere, freight container is also rubbed and is collided in the transport operation lack of standardization of being everlasting in addition.The environment for use of freight container requires its surface to have very strong corrosion resistance nature, and the contribution of the corrosion resistance nature of container made of steel weather-proof element in steel matrix, its antiseptic property is mainly guaranteed by the coating container matching system.The normal 3 coating matching systems that use in the Nowadays, Container shipping outside: zinc rich primer → intermediate coat → finish paint; The normal 2 coating matching systems that use at the bottom of inner face and case: zinc rich primer → finish paint.These coating corollary systems have good integrated protection performance, can protect well freight container under the severe environment of working container, make it avoid corrosion.
The case outside coatings system system of freight container of take is example, and its main coating process is as follows:
Flat → shearing → sandblast that coil of strip is opened/ball blast → spray shop primer → spray base → spray intermediate coat → topcoating.
Sandblast in coating process and ball blast pre-treatment, its main purpose is in order to remove the iron scale of belt steel surface, and provides the roughness that is beneficial to the coating protection performance.After sandblast or Shot Blasting, painting workshop priming paint is in order to prevent pretreated steel surface oxidation or accumulated impurity again.Yet 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 container production producer 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.
Being similar to container steel exempts from the principal feature of sandblast and the pretreated correlation technique of ball blast and is belt steel surface scale structure and thickness in the optimal control course of hot rolling, make the ferric oxide cortex can deform and do not come off with matrix in deep-processing process, therefore do not 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 black rust steel for a kind of 510L automotive frame ", application number: 201110031827.5, the production method of black rust steel for the 510L automotive frame of having announced a kind of sheet rolling technical field, Composition Control: C is 0.06-0.14%, Si for<0.2%, Mn is 1.2-1.6%, P for<0.02%, S for<0.01%, Nb is that 0.01-0.05%, Alt are 0.02-0.06%.Control slab heating temperature at 1230 ~ 1270 ℃, be 3 ~ 3.5 hours heat-up time, controls 1040 ~ 1080 ℃ of roughing temperature outs, finish rolling finishing temperature in techniques such as 540 ~ 580 ℃ of 860 ~ 880 ℃ 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, by chemical composition and heating cycle and the steel rolling process etc. of optimizing beam steel, produced 510L and the 610L steel for automobile crossbeam plate of exempting from pickling.The 510L chemical composition is that C is that 0.06-0.12%, Si are that 0.05-0.15%, Mn are 0.50-1.40%, P for<0.02%, S for<0.01%, Cr is that 0.05-0.25%, Nb are that 0.01-0.04%, Alt are>0.02%; The 610L chemical composition is that C is that 0.06-0.12%, Si are that 0.05-0.15%, Mn are 1.20-1.70%, P for<0.02%, S for<0.01%, Cr is 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 is controlled as Heating temperature at 1220 ~ 1300 ℃, and be 3 ~ 3.5 hours heat-up time, controls the finish rolling finishing temperature 540 ~ 600 ℃ of 860 ~ 1000 ℃ and coiling temperatures etc.As Chinese patent " the 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 0.9-1.30%, P for<0.027%, S for<0.017%, Ti is that 0.004-0.012%, Nb are that 0.013-0.027%, Al are 0.01-0.09%.Billet heating temperature is 1200-1240 ℃; Hot rolling roughing start rolling temperature 1120-1220 ℃, finishing temperature 870-910 ℃, coiling temperature 550-585 ℃.Document " paddy spring sun-light, the time twilight, Zhang Ziyin; the development of hot rolling black surface steel plate 335L for automotive frame; " steel rolling "; 2009; April " production of 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 ℃, finishing temperature>Ar3, coiling temperature<600 ℃.
About the freight container weathering steel, the relevant report in environment-friendly type sufacing processing aspect is not yet arranged, its major technique research concentrates on the high strength aspect, as Chinese patent " a kind of method of producing the 700MPa Mpa V-N microalloyed high-strength air corrosion-resistant steel based on continuous casting and rolling technique of sheet bar ", application number 200610035800.2, announced under the continuous casting and rolling technique of sheet bar condition sheet material that other high-strength container of production intensity 700MPa level is used.Its chemical composition C for≤0.08%, Si is that 0.25-0.75%, Mn are that 0.8-2.0%, P are 0.070-0.150%, S for≤0.040%, Cu is that 0.25-0.60%, Cr are 0.30-1.25%, Ni for≤0.65%, V is that 0.05-0.25%, N are 0.015-0.030%.Chinese patent " has good high-intensity weather-resistant hot rolled steel sheet and manufacture method thereof ", application number 200780047894.8, announced a kind of high tensile steel plate with excellent weather resistance, Cu, Cr and Ni with weathering resistance have been added, yield strength is at 700-800MPa, and tensile strength is at 800-900MPa.
The front pretreatment process of paint of exempting from the pickling beam steel is generally bonderizing, and freight container pretreatment to the coating in process of production 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 the 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 that by controlling the steel product surface appearance technology of exempting from sandblast and Shot Blasting there is no relevant report at present.If sandblast or Shot Blasting are not carried out in the container steel surface, directly carry out application, need the densification of steel surface ferric oxide cortex, clean, its surfaceness is conducive to the application of coating, and iron scale and vanish system have consistency preferably, does not affect the coating properties.Therefore, in the steel for container production process, it is carried out to surface and control, make it in the Production Container process, exempt sandblast and Shot Blasting has its technological innovation and practicality.In addition, cancel sandblast and ball blast pretreatment process, discharge and the noise pollution of dust while producing 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, and the pill price is 10000 yuan/tons, the ball blast cost of steel per ton is 40 yuan, considers that the factors such as power consumption, human cost are cancelled the ball blast operations cost-saved at 40 yuan/tons more than steel.
Therefore, produce there is fine iron oxide skin performance, be applicable to freight container application and moulding process exempt from sandblast and the Shot Blasting freight container meets the requirement of country to " energy-saving and emission-reduction " with weathering steel, be very promising technology.
Summary of the invention
The purpose of this invention is to provide a kind of production method of exempting from sandblast and Shot Blasting freight container use weathering steel, at original freight container with on SPA-H base steel plinth, carrying out chemical composition and technology controlling and process, produce the freight container weathering steel with good oxidation iron sheet performance, in the freight container coating process, it can be without sandblast and the ball blast pretreatment process of non-environment-friendly type, 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: the production method of exempting from sandblast and Shot Blasting freight container use weathering steel proposed by the invention, adopting the hot rolling technology flow process: process furnace heating → roughing → finish rolling → laminar flow is cooling → batch → quenching → stay-warm case insulation → finishing, it is characterized in that:
1) the finishing mill start rolling temperature is controlled at 950 ℃～1020 ℃, and finishing temperature is at 850 ℃～900 ℃, roll speed>5.5m/s, and each frame of finish rolling adopts lubrication and rolling;
2) rack of finishing mill roll surface roughness Ra should be controlled at 0.8～2.4 μ m;
3) it is cold soon that the laminar flow type of cooling adopts leading portion, and cooling water quality is controlled at weakly alkaline, pH value=7.0～10;
4) coiling temperature is controlled at 550 ℃～620 ℃:
5) batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 460～500 ℃ with the cooling rate of 2～5 ℃/min;
6) then coil of strip is put into the stay-warm case insulation, after temperature is down to 200 ± 20 ℃, coil of strip is taken out, and naturally cools to room temperature.
The described production method of exempting from sandblast and Shot Blasting freight container use weathering steel, it is characterized in that: adopt the chemical composition mass percent wt% of slab to be controlled at: C:0.04～0.12%, Si:0.20～0.25 %, Mn:0.25～0.50%, S :≤0.015%, P :≤0.12%, Cu:0.25～0.40%, Cr:0.30～0.50%, Ni:0.10～0.50%, all the other are iron and inevitable impurity.
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 ℃, coil of strip is taken out, and naturally cools to room temperature.
Described finishing mill start rolling temperature is controlled at 980 ℃ ~ 1020 ℃, and finishing temperature is at 840 ℃～880 ℃, roll speed 6.0m/s, and rack of finishing mill roll surface roughness Ra is controlled at 1.4～2.4 μ m.
Described coiling temperature is controlled at 600 ℃, batching rear coil of strip is placed on the ventilating convection place or adopts fan to increase ventilating convection, cooling rate with 4～5 ℃/min is cooled to 500 ℃, then put into coil of strip stay-warm case insulation 36 hours, after temperature is down to 200 ℃ ± 20 ℃, coil of strip is taken out, naturally cool to room temperature.
Described slab exists in the process furnace heating and temperature control: 1220 ℃～1280 ℃, the process furnace time inside furnace is controlled at 100min～200min.
The temperature out of described roughing is at 1020 ℃～1100 ℃, roughing rolling pass >=3, and the de-scaling passage should >=2.
The described production method of exempting from sandblast and Shot Blasting freight container use weathering steel, rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, slab length is controlled at 9.8～10.0m, adopt the chemical composition mass percent wt% of slab to be: C:0.085%, Si:0.25%, Mn:0.42%, S:0.006%, P:0.080%, Cu:0.301%, Cr:0.390%, Ni:0.127%, all the other are iron and inevitable impurity;
Slab exists in the process furnace heating and temperature control: 1250 ℃～1260 ℃, tapping temperature is 1240 ℃, process furnace time inside furnace 160min; The temperature out of roughing is at 1040～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 5 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.2m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.2～1.6 μ m;
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at pH value 7.0;
Coiling temperature is controlled at 600 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 30 hours, after temperature is down to 200 ℃, coil of strip is taken out, naturally cool to room temperature.
The described production method of exempting from sandblast and Shot Blasting freight container use weathering steel, rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, slab length is controlled at 10.0～10.8m, adopt the chemical composition mass percent wt% of slab to be: C:0.082%, Si:0.20%, Mn:0.48%, S:0.005%, P:0.092%, Cu:0.301%, Cr:0.388%, Ni:0.128%, all the other are iron and inevitable impurity; Slab is in the process furnace heating and temperature control at 1260 ℃～1280 ℃, and tapping temperature is 1250 ℃, process furnace time inside furnace 150min; The temperature out of roughing is at 1050～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 4 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.0m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.4～2.4 μ m;
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at pH value 8.0;
Coiling temperature is controlled at 580 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 480 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 40 hours, after temperature is down to 200 ℃, coil of strip is taken out, naturally cool to room temperature.
The described production method of exempting from sandblast and Shot Blasting freight container use weathering steel, rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, slab length is controlled at 9.8～10.0m, adopt the chemical composition mass percent wt% of slab to be: C:0.085%, Si:0.25%, Mn:0.42%, S:0.006%, P:0.080%, Cu:0.301%, Cr:0.390%, Ni:0.127%, all the other are iron and inevitable impurity;
Slab exists in the process furnace heating and temperature control: 1250 ℃～1260 ℃, tapping temperature is 1240 ℃, process furnace time inside furnace 160min; The temperature out of roughing is at 1040～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 5 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.2m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.2～1.6 μ m;
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at pH value 10.
Coiling temperature is controlled at 600 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 35 hours, after temperature is down to 200 ℃, coil of strip is taken out, naturally cool to room temperature.
Beneficial effect of the present invention:
The freight container that the present invention obtains is used the densification of weathering steel scale on surface and is combined with matrix closely, and thickness is 8～10 μ m and even; Scale structure is mainly Fe
3O
4, content>80%; Iron scale bed roughness Ra is 0.6～1.2 μ m, meets the freight container coating specification.This freight container has been cancelled sandblast and ball blast operation and painting workshop priming paint operation subsequently with the application of weathering steel, by coating process from:
Flat → shearing → sandblast that coil of strip is opened/ball blast → spray shop primer → spray base → spray intermediate coat → topcoating
Be reduced to:
Coil of strip is opened flat → shearing → spray base → spray intermediate coat → topcoating.
(1) the freight container weathering steel obtained according to production method provided by the invention, it can cancel the necessary sandblast of original container production or ball blast pretreatment process in use, is directly used in application, has reduced discharge and the noise pollution of dust while producing; Cancel sandblast and ball blast pretreatment process, do not need surface of steel plate is carried out the spraying of shop primer, simplified production process, reduced production cost.
(2) the freight container weathering steel obtained according to production method provided by the invention, its scale on surface densification, good with the steel matrix bonding force, in the technological processs such as distortion, welding, do not come off; Iron scale is with Fe
3O
4For primary structure, there is certain corrosion resistance nature; Its surfaceness meets the coating specification of coating, there is consistency preferably with the coating container corollary system, to coating performance particularly corrosion resistance nature have no adverse effect, and it has good impact resistance, makes it avoid being subject in use impacting and come off.
(3) popularization of this technology, responded the call of country's " energy-saving and emission-reduction ", can reduce energy consumption, improves the economic benefit of enterprise, strengthens the competitive power of enterprise.
Embodiment
A kind of production method of exempting from sandblast and Shot Blasting freight container use weathering steel of the present invention, adopting the hot rolling technology flow process: process furnace heating → roughing → finish rolling → laminar flow is cooling → batch → quenching → stay-warm case insulation → finishing, adopt the chemical composition mass percent wt% of slab to be controlled at: C:0.04～0.12%, Si:0.20～0.25 %, Mn:0.25～0.50%, S :≤0.015%, P :≤0.12%, Cu:0.25～0.40%, Cr:0.30～0.50%, Ni:0.10～0.50%, all the other are iron and inevitable impurity.
Wherein:
1) the finishing mill start rolling temperature is controlled at 950 ℃～1020 ℃, and finishing temperature is at 850 ℃～900 ℃, roll speed>5.5m/s, and each frame of finish rolling adopts lubrication and rolling;
2) rack of finishing mill roll surface roughness Ra should be controlled at 0.8～2.4 μ m;
3) the laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at weakly alkaline, pH value=7.0～10, preferably 8～9;
4) coiling temperature is controlled at 550 ℃～620 ℃:
5) batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 460～500 ℃ with the cooling rate of 2～5 ℃/min;
6) then coil of strip is put into the stay-warm case insulation, after temperature is down to 200 ± 20 ℃, coil of strip is taken out, and naturally cools to room temperature.
Embodiment 1:
Rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, and continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, and slab length is controlled at 9.8～10.0m, the steel slab surface zero defect.Adopt the chemical composition mass percent wt% of slab to be: C:0.087%, Si:0.23%, Mn:0.44%, S:0.005%, P:0.092%, Cu:0.301%, Cr:0.390%, Ni:0.128%, all the other are iron and inevitable impurity.
Slab exists in the process furnace heating and temperature control: 1220 ℃～1280 ℃, tapping temperature is 1250 ℃, process furnace time inside furnace 180min; The temperature out of roughing is at 1080～1100 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 3 passages; The finishing mill start rolling temperature is controlled at 980 ℃ ~ 1020 ℃, and finishing temperature is at 850 ℃～880 ℃, roll speed 5.7m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 0.8～1.2 μ m.
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at weakly alkaline, pH value 7.0.
Coiling temperature is controlled at 600 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 500 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 30 hours, after temperature is down to 200 ℃ of left and right, coil of strip is taken out, naturally cool to room temperature.
Under room temperature state, to exempting from sandblast and shot peening freight container, with the every mechanical performance index of weathering steel, test, yield strength is 385MPa, and tensile strength is 520MPa, and elongation is 35%, crooked its surperficial flawless of check.Its scale on surface is tested, and iron scale thickness is 8～10 μ m and even; Scale structure is mainly Fe
3O
4, content is more than 80%; Ferric oxide cortex surface roughness Ra is 0.6～1.0 μ m, without sandblast, ball blast pre-treatment, is directly sprayed the epoxy zinc rich primer postadhesion good, on the japanning of follow-up impact briquetting, welding and rear operation without impact.
Embodiment 2:
Rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, and continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, and slab length is controlled at 10.0～10.8m, the steel slab surface zero defect.Adopt the chemical composition mass percent wt% of slab to be: C:0.082%, Si:0.20%, Mn:0.48%, S:0.005%, P:0.092%, Cu:0.301%, Cr:0.388%, Ni:0.128%, all the other are iron and inevitable impurity.
Slab exists in the process furnace heating and temperature control: 1220 ℃～1280 ℃, tapping temperature is 1250 ℃, process furnace time inside furnace 150min; The temperature out of roughing is at 1050～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 4 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.0m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.4～2.4 μ m.
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at weakly alkaline, pH value 8.0.
Coiling temperature is controlled at 580 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 480 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 40 hours, after temperature is down to 200 ℃ of left and right, coil of strip is taken out, naturally cool to room temperature.
Under room temperature state, to exempting from sandblast and shot peening freight container, with the every mechanical performance index of weathering steel, test, yield strength is 380MPa, and tensile strength is 515MPa, and elongation is 38%, crooked its surperficial flawless of check.Its scale on surface is tested, and iron scale thickness is 8～9.5 μ m and even; Scale structure is mainly Fe
3O
4, content is more than 85%; Ferric oxide cortex surface roughness Ra is 1.0～1.4 μ m, without sandblast, ball blast pre-treatment, is directly sprayed the epoxy zinc rich primer postadhesion good, on the japanning of follow-up impact briquetting, welding and rear operation without impact.
Embodiment 3:
Rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, and continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, and slab length is controlled at 9.8～10.0m, the steel slab surface zero defect.Adopt the chemical composition mass percent wt% of slab to be: C:0.085%, Si:0.25%, Mn:0.42%, S:0.006%, P:0.080%, Cu:0.301%, Cr:0.390%, Ni:0.127%, all the other are iron and inevitable impurity.
Slab exists in the process furnace heating and temperature control: 1250 ℃～1260 ℃, tapping temperature is 1240 ℃, process furnace time inside furnace 160min; The temperature out of roughing is at 1040～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 5 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.2m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.2～1.6 μ m.
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at weakly alkaline, pH value 9.
Coiling temperature is controlled at 600 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 35 hours, after temperature is down to 200 ℃ of left and right, coil of strip is taken out, naturally cool to room temperature.
Under room temperature state, to exempting from sandblast and shot peening freight container, with the every mechanical performance index of weathering steel, test, yield strength is 395MPa, and tensile strength is 520MPa, and elongation is 37%, crooked its surperficial flawless of check.Its scale on surface is tested, and iron scale thickness is 7.5～8.0 μ m and even; Scale structure is mainly Fe
3O
4, content is more than 85%; Ferric oxide cortex surface roughness Ra is 0.8～1.2 μ m, without sandblast, ball blast pre-treatment, is directly sprayed the epoxy zinc rich primer postadhesion good, on the japanning of follow-up impact briquetting, welding and rear operation without impact.
Claims (7)
1. to exempt from sandblast and the Shot Blasting freight container production method with weathering steel for one kind, adopt the hot rolling technology flow process: process furnace heating → roughing → finish rolling → laminar flow is cooling → batch → quenching → stay-warm case insulation → finishing, it is characterized in that:
Adopt the chemical composition mass percent wt% of slab to be controlled at: C:0.04～0.12%, Si:0.20～0.25 %, Mn:0.25～0.50%, S :≤0.015%, P :≤0.12%, Cu:0.25～0.40%, Cr:0.30～0.50%, Ni:0.10～0.50%, all the other are iron and inevitable impurity;
1) slab exists in the process furnace heating and temperature control: 1220 ℃～1280 ℃, the process furnace time inside furnace is controlled at 100min～200min; The temperature out of roughing is at 1020 ℃～1100 ℃, roughing rolling pass >=3, and the de-scaling passage should >=2;
2) the finishing mill start rolling temperature is controlled at 950 ℃～1020 ℃, and finishing temperature is at 850 ℃～900 ℃, roll speed>5.5m/s, and each frame of finish rolling adopts lubrication and rolling;
3) rack of finishing mill roll surface roughness Ra should be controlled at 0.8～2.4 μ m;
4) it is cold soon that the laminar flow type of cooling adopts leading portion, and cooling water quality is controlled at weakly alkaline, pH value=7.0～10;
5) coiling temperature is controlled at 550 ℃～620 ℃:
6) batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 460～500 ℃ with the cooling rate of 2～5 ℃/min;
7) then coil of strip is put into the stay-warm case insulation, after temperature is down to 200 ± 20 ℃, coil of strip is taken out, and naturally cools to room temperature.
2. sandblast and the Shot Blasting freight container production method with weathering steel of exempting from according to claim 1, it is characterized in that: step 7) is put into coil of strip stay-warm case insulation slow cooling and is controlled at 30～40 hours.
3. sandblast and the Shot Blasting freight container production method with weathering steel of exempting from according to claim 1 and 2, it is characterized in that: the finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, finishing temperature is at 840 ℃～880 ℃, roll speed 6.0m/s, rack of finishing mill roll surface roughness Ra is controlled at 1.4～2.4 μ m.
4. sandblast and the Shot Blasting freight container production method with weathering steel of exempting from according to claim 1 and 2, it is characterized in that: coiling temperature is controlled at 600 ℃, batching rear coil of strip is placed on the ventilating convection place or adopts fan to increase ventilating convection, cooling rate with 4～5 ℃/min is cooled to 500 ℃, then puts into coil of strip stay-warm case insulation 36 hours.
5. sandblast and the Shot Blasting freight container production method with weathering steel of exempting from according to claim 1 and 2, it is characterized in that: rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, slab length is controlled at 9.8～10.0m, adopt the chemical composition mass percent wt% of slab to be: C:0.085%, Si:0.25%, Mn:0.42%, S:0.006%, P:0.080%, Cu:0.301%, Cr:0.390%, Ni:0.127%, all the other are iron and inevitable impurity;
Slab exists in the process furnace heating and temperature control: 1250 ℃～1260 ℃, tapping temperature is 1240 ℃, process furnace time inside furnace 160min; The temperature out of roughing is at 1040～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 5 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.2m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.2～1.6 μ m;
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at pH value 7.0;
Coiling temperature is controlled at 600 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 30 hours, after temperature is down to 200 ℃, coil of strip is taken out, naturally cool to room temperature.
6. sandblast and the Shot Blasting freight container production method with weathering steel of exempting from according to claim 1 and 2, it is characterized in that: rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, slab length is controlled at 10.0～10.8m, adopt the chemical composition mass percent wt% of slab to be: C:0.082%, Si:0.20%, Mn:0.48%, S:0.005%, P:0.092%, Cu:0.301%, Cr:0.388%, Ni:0.128%, all the other are iron and inevitable impurity; Slab is in the process furnace heating and temperature control at 1260 ℃～1280 ℃, and tapping temperature is 1250 ℃, process furnace time inside furnace 150min; The temperature out of roughing is at 1050～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 4 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.0m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.4～2.4 μ m;
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at pH value 8.0;
Coiling temperature is controlled at 580 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 480 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 40 hours, after temperature is down to 200 ℃, coil of strip is taken out, naturally cool to room temperature.
7. sandblast and the Shot Blasting freight container production method with weathering steel of exempting from according to claim 1 and 2, it is characterized in that: rolling 4.0 * 1300mm exempts from sandblast and Shot Blasting freight container weathering steel, continuous casting steel billet thickness is 230mm, width of plate slab 1350mm, slab length is controlled at 9.8～10.0m, adopt the chemical composition mass percent wt% of slab to be: C:0.085%, Si:0.25%, Mn:0.42%, S:0.006%, P:0.080%, Cu:0.301%, Cr:0.390%, Ni:0.127%, all the other are iron and inevitable impurity;
Slab exists in the process furnace heating and temperature control: 1250 ℃～1260 ℃, tapping temperature is 1240 ℃, process furnace time inside furnace 160min; The temperature out of roughing is at 1040～1080 ℃, and the roughing rolling pass is 5 passages, and the de-scaling passage is 5 passages; The finishing mill start rolling temperature is controlled at 980 ℃～1020 ℃, and finishing temperature is at 840 ℃～870 ℃, roll speed 6.2m/s, and each frame of finish rolling drops into lubricating oil, and rack of finishing mill roll surface roughness Ra is controlled at 1.2～1.6 μ m;
The laminar flow type of cooling adopts leading portion cold soon, and cooling water quality is controlled at pH value 9;
Coiling temperature is controlled at 600 ℃, batch rear coil of strip and be placed on the ventilating convection place or adopt fan to increase ventilating convection, be cooled to 470 ℃ with the cooling rate of 4～5 ℃/min, then put into coil of strip stay-warm case insulation 35 hours, after temperature is down to 200 ℃, coil of strip is taken out, naturally cool to room temperature.
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| CN103103458B (en) * | 2013-02-17 | 2015-07-01 | 武汉钢铁(集团)公司 | High strength weathering resistant steel and preparation method |
| CN103194695B (en) * | 2013-04-07 | 2015-04-08 | 武汉钢铁(集团)公司 | Steel with stable oxide layer for pretreatment-free high-strength container and manufacture method of steel |
| CN104404382B (en) * | 2014-11-19 | 2017-01-04 | 武汉钢铁(集团)公司 | Exempt from sandblasting direct application weathering steel and production method thereof |
| CN111719081A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Control method for reducing cost of steel optimized alloy for container |
| CN111101070A (en) * | 2020-02-17 | 2020-05-05 | 本钢板材股份有限公司 | Steel for low-temperature liquid container tank car and preparation method thereof |
| CN111850406A (en) * | 2020-07-29 | 2020-10-30 | 攀钢集团研究院有限公司 | 380MPa grade high-phosphorus weathering steel and preparation method thereof |
| CN112111690B (en) * | 2020-08-06 | 2022-03-25 | 湖南华菱涟钢特种新材料有限公司 | Thin-specification high-strength container plate and preparation method thereof |
| CN112375966B (en) * | 2020-10-19 | 2022-08-09 | 邯郸钢铁集团有限责任公司 | Container plate with good toughness and production method thereof |
| CN114231843A (en) * | 2021-12-03 | 2022-03-25 | 日照钢铁控股集团有限公司 | Manufacturing method of plate-band weathering steel product for container gooseneck tunnel |
| CN115261733B (en) * | 2022-08-18 | 2023-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Abrasion-resistant corrosion-resistant steel rail for subway and production method thereof |
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| CN1974034A (en) * | 2006-12-08 | 2007-06-06 | 广州珠江钢铁有限责任公司 | Improved container plate producing process |
| CN101139687A (en) * | 2007-10-12 | 2008-03-12 | 莱芜钢铁集团有限公司 | Weather-resistant hot rolled broad steel strip and method for manufacturing same |
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| CN101139687A (en) * | 2007-10-12 | 2008-03-12 | 莱芜钢铁集团有限公司 | Weather-resistant hot rolled broad steel strip and method for manufacturing same |
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