CN101139687A - Weather-resistant hot rolled broad steel strip and method for manufacturing same - Google Patents

Weather-resistant hot rolled broad steel strip and method for manufacturing same Download PDF

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CN101139687A
CN101139687A CNA2007101132313A CN200710113231A CN101139687A CN 101139687 A CN101139687 A CN 101139687A CN A2007101132313 A CNA2007101132313 A CN A2007101132313A CN 200710113231 A CN200710113231 A CN 200710113231A CN 101139687 A CN101139687 A CN 101139687A
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steel
weather
rolling
hot rolled
steel strip
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CN100513618C (en
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董杰
周平
亓伟伟
王学新
孙正旭
霍孝新
宁伟
杨旭
胡滨
陈爱娇
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Laiwu Iron and Steel Group Co Ltd
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Laiwu Iron and Steel Group Co Ltd
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Abstract

The invention relates to a manufacturing method of weathering resistance steel stripe. The chemical components based on the weight percentage are that: C of 0.06 to 0.12 per cent, Si of 0.25 to 0.50 per cent, Mn of 0.30 to 0.50 per cent, P of 0.07 to 0.15 per cent, S of less than 0.015 per cent, Cu of 0.25 to 0.40 per cent, Cr of 0.30 to 1.2 per cent, Ni of 0.10 to 0.50 per cent, and the remainder Fe and unavoidable foreign matters. The steel stripe is manufactured by converter smelting, continuous sheet blank casting, and rolling by a hot continuous rolling unit, etc., which has excellent anti-corrosion performance and weldability, even mechanical properties, and can be used for making a plurality of products with long service life. The weathering resistance steel stripe is especially suitable for manufacturing containers, and has low cost and easy industrialization.

Description

A kind of Weather-resistant hot rolled broad steel strip and manufacture method thereof
Technical field
The present invention relates to a kind of weathering steel and manufacture method thereof, belong to low alloy steel and make the field, be specifically related to a kind of Weather-resistant hot rolled broad steel strip that freight container is made that is mainly used in.
Background technology
Weathering steel is the common name of the steel grade of a class atmospheric corrosion resistance, and prior art generally adopts adds alloying elements such as a large amount of Cu, P, Cr, Ni, Al, the also interpolation As, Ce, Co, the elements such as Ti, V that have in steel.As Chinese patent file CN1752260 and CN1970818, though improved the performance of steel like this, cost is too high, and the technical process complexity, and there is bigger difficulty in the marketization.
Chinese patent file CN1664152 discloses the high-strength anti-corrosion steel plate (hereinafter to be referred as steel grade one) that a kind of rail vehicle uses and preparation method thereof (application number 200510012431.0), the chemical ingredients of this steel plate (weight percentage) is: C≤0.10, Si≤2.00, Mn≤2.00, P≤0.040, S≤0.030, Cr 8.00-12.0, Ni 0.2-0.5 and Fe, and 700 ± 10 ℃ of insulations annealing in 6-12 hour, in air the steel plate of naturally cooling.Its preparation method is to cast steel billet earlier, in 1200 ± 30 ℃, is incubated 200 minutes in sealed heating furnace; During to 820 ± 30 ℃, be rolled into steel plate; When being cooled to 650 ± 30 ℃, steel plate is rolled into coil of strip; Coil of strip is incubated annealing in 6-12 hour at 700 ± 10 ℃, annealing back naturally cooling.This rail vehicle with anti-corrosion steel plate under painted situation not, year etching extent in 0.05 millimeter, good manufacturability.This invention cost is very high, and there is certain difficulty in marketing.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of Weather-resistant hot rolled broad steel strip and manufacture method thereof are provided, belong to the weather-proof steel of low-alloy, this wide strip is specially adapted to the freight container manufacturing, and cost is low, and industrialization is easy.
Technical scheme of the present invention is as follows:
Weather-resistant hot rolled broad steel strip, wherein the chemical component weight degree of steel is:
C:0.06-0.12%, Si:0.25-0.50%, Mn:0.30-0.50%, P:0.07-0.15%, S:0.015% are following, Cu:0.25-0.40%, Cr:0.30-1.2%, Ni:0.10-0.50%, Alt:0.01-0.03%, all the other are Fe and trace impurity.
Determining of steel grades of the present invention taken into account the corrosion resistance nature of hot rolled strip, higher requirement of strength, welding property requirement simultaneously, promptly to the contribution of steel band erosion resistance bigger element P, Cu, Cr and intensity contribution Elements C, Si, Mn reasonable ratio.Based on the requirement of steel band corrosion resistance nature, P, Cu, Cr are controlled at P:0.07-0.15%, Cu:0.25-0.40%, Cr:0.30-1.2% in the following scope; For satisfying the requirement of welding property, carbon content is controlled at 0.06-0.12%, S≤0.015%; Take all factors into consideration the requirement of strength of steel band, Si, Mn are controlled in the following scope: Si:0.25-0.50%, Mn:0.30-0.50%; The course of hot rolling of Copper Bearing Steel is prone to " copper brittleness " defective, thereby adds the hot workability after a certain amount of nickel improves the heating of cupric steel billet in the steel, takes all factors into consideration effect and the production cost of nickel in steel, and nickel content is controlled at Ni:0.10-0.50%.
Further preferred, the chemical component weight degree of steel is: C:0.06-0.10%, Si:0.35-0.45%, Mn:0.35-0.50%, P:0.08-0.10%, S≤0.010%, Cu:0.25-0.35%, Cr:0.30-0.50%, Ni:0.10-0.15%, Alt:0.01-0.03%, all the other are Fe and trace impurity.
The manufacture method of Weather-resistant hot rolled broad steel strip of the present invention, the technological process of production of employing is as follows:
Hot metal pretreatment-top and bottom combined blown converter smelting-LF ladle refining-sheet billet continuous casting-1500 broadband is rolling.
The manufacture method of Weather-resistant hot rolled broad steel strip of the present invention; comprise that pre-desulphurised hot metal enters top and bottom combined blown converter smelting; deoxidation and Alloying Treatment; molten steel after the smelting carries out the LF ladle refining; molten steel after refining is carried out whole process protection cast (sheet billet continuous casting) on continuous caster; it is rolling that continuously cast bloom enters 1500 broadbands again; it is characterized in that the chemical component weight degree of steel is: C 0.06-0.12%, Si 0.25-0.50%; Mn 0.30-0.50%; P 0.07-0.15%, S be below 0.015%, Cu0.25-0.40%; Cr 0.30-1.2%; Ni 0.10-0.50%, Alt 0.01-0.03%, all the other are Fe and trace impurity.Rolling employing four roll reversing rollers carry out 5 passage breaking down, and finish rolling is six tandem rolling units; The thick 26-29mm that is chosen at of intermediate blank.Adopt hightension rolling when rolling, tension force 80-100KN, 1020 ℃-1080 ℃ of roughing extreme trace time temperature; 870 ± 20 ℃ of finish rolling finishing temperatures; 620 ± 15 ℃ of coiling temperatures.
Further preferred, can consider that following processing condition operate:
1, hot metal pretreatment
Adopt the winding-up Inactivate granular magnesium to carry out molten iron pre-desulfurization in iron ladle, sulphur is controlled at below 0.015% in the molten iron, and temperature is not less than 1250 ℃.
2, converter smelting
Before smelting corronel is added converter with steel scrap.Control suitable rifle position and reinforced opportunity in the smelting process, the slag making material added in terminal point in preceding 3 minutes.Terminal point control: C≤0.06%, S<0.015%.At first at the bottom of ladle, add synthetic slag before the converter tapping and carry out wash heat.Adopt silico-calcium barium, the deoxidation of aluminium manganese titanium, consumption is the 1kg/t steel, is putting steel four/for the moment, add silico-calcium barium, aluminium manganese titanium, silicomanganese, ferrosilicon, ferrophosphorus, medium carbon ferrochrome, and molten steel goes out to 3/4ths o'clock to add.
Synthetic slag and consumption get final product by prior art, are generally the 750-850kg/ stove.
3, LF refining
The operation of white slag method is adopted in refining.In order to improve the molten steel cleanliness factor, guarantee that molten steel has good casting properties, improve the quality of steel, feeding 500-600m/ stove silicon-calcium wire carries out calcification processing in molten steel, and the stirring of soft blow argon, calmness are time 12-20 minute after the line feeding.
4, sheet billet continuous casting
Sheet billet continuous casting adopts the whole process protection cast, covering slag container plate privacy protection slag (west, Henan is protected metallurgical material Group Co.,Ltd and produced).For guaranteeing continuous casting billet quality, reduce crackle, crystallizer cooling and secondary cooling are all adopted weak cold: the crystallizer inflow temperature is than the high 3-6 of straight carbon steel ℃, and two cold specific waters are the 0.8-1.01/kg steel.
This steel grade contains alloying element cu, and base shell and copper plate of crystallizer have certain avidity, stick together easily, cause bonding steel leakage, and the Cu in the steel can make casting billet surface crack, and can cause the crackle bleed-out under the pulling rate condition with higher.Steel interalloy constituent content height, process of setting steel billet shrinking percentage is big, forms easily than air gaps between base shell and crystallizer inwall, hinders the base shell and conducts heat, and the attenuation of base shell also can cause bleed-out.Thereby strict control pulling rate is than straight carbon steel low 20%.
5, the 1500mm broadband is rolling
This steel grade Cu content is higher, therefore in reductibility or the heating of neutral atmosphere, reduces heat-up time and prevents over oxidation, avoids steel that the limit takes place when rolling and splits; Accelerate heat-up rate during heating, improve Heating temperature, shorten steel billet high temperature (1100 ℃ of right sides) time inside furnace.Should suitably reduce soaking temperature in addition.In the production process, under the hot-loading and hot-conveying condition, the tapping temperature of slab is: 1160 ℃-1210 ℃, heat-up time 80-90min.
Because this steel grade material is harder, and institute's rolling specs is thinner, finishing train rolling load and rolling electric current are bigger in the operation of rolling, are prone to accidents when rolling, therefore suitably reduce intermediate blank thickness.According to the specification difference of becoming a useful person, the thick 26-29mm that generally is chosen at of intermediate blank.Adopt hightension rolling when rolling, tension force adopts design higher limit 80-100KN, compares high approximately 20KN than same specification straight carbon steel series.
Weather-resistant hot rolled broad steel strip of the present invention is specially adapted to the freight container manufacturing, and cost is low, and industrialization is easy.
Beneficial effect
The present invention is compared with prior art: the present invention has stipulated more accurate span of control to each element in the steel, under the situation that reduces expensive alloy element content, STEELMAKING PRODUCTION cost of alloy, the corrosion resistance nature of steel band does not reduce, the stable easily control of production process, chemical ingredients.This invention is respond well by the steel band atmospheric corrosion resistance, and welding property is good, intensity is higher, good moldability, the freight container manufacturing user's that meets the requirements requirement.
This composition of steel control: C0.10%, Si0.42%, Mn0.39%, P0.086%, S0.003%, Cu0.273%, Cr0.337%, Ni0.103%, Alt0.021%; Steel band mechanical property: yield strength 425MPa, tensile strength 540MPa, unit elongation 32.5%.Use DW-UD-3 type dipping and do wet compound cycle testing apparatus, adopt dipping-moistening-dry three processes to move in circles and simulate the atomospheric corrosion process, circulation in per 15 minutes, steeping fluid adopts 0.01mol/L NaHSO 3+ 0.005mol/LNaCl the aqueous solution is with simulation industrial city atomospheric corrosion, long run test 120 hours.Press the method for GB/T16545-1996 regulation, the calculating erosion rate is: 1.8 gram/rice 2Hour, be equivalent to 54.8% of the straight carbon steel produced with the bar production line.And with existing similar steel grade contrast, only Cu, Cr, three alloy items of Ni 600-2300 unit/t steel that just can reduce cost.
Embodiment
Embodiment 1: Weather-resistant hot rolled broad steel strip and manufacture method thereof
1, the chemical ingredients of steel is as follows by weight percentage:
C:0.08%, Si:0.38%, Mn:0.38%, P:0.086%, S:0.005%, Cu:0.263%, Cr:0.349%, Ni:0.125%, Alt:0.021%, all the other are Fe and unavoidable impurities.
2, the manufacture method of Weather-resistant hot rolled broad steel strip
(1) technological process of production
Hot metal pretreatment-top and bottom combined blown converter smelting-LF ladle refining-sheet billet continuous casting-1500 broadband rolling (2) is an example with the thick steel band of 6.0mm, and slab thickness is 160mm, belongs to medium thin slab.Step is as follows:
Hot metal pretreatment molten iron sulphur is controlled at below 0.010%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.Converter smelting endpoint control: C:0.04%, S:0.010%.The operation of LF refining white slag.Every stove molten steel feeding 500mSi-Ca line carries out calcification processing, soft blow argon 12-14 minute.The cast of sheet billet continuous casting whole process protection, covering slag adopt the west, Henan to protect low melting point, the low viscosity container plate privacy protection slag that metallurgical material Group Co.,Ltd produces.The crystallizer cooling water inflow is constant, and inflow temperature is increased to 30-33 ℃; Two cold employings are weak cold, and the specific water gets 0.91/kg.Control each section pulling rate than straight carbon steel low 20%.This steel grade Cu content is higher, therefore at neutral atmosphere internal heating, accelerates heat-up rate during heating, improves Heating temperature, shortens steel billet high temperature time inside furnace.Suitably reduce soaking temperature to 1240 ℃ than straight carbon steel.In the production process, under the hot-loading and hot-conveying condition, the tapping temperature of slab is: 1200 ℃, and hot charging condition following heat-up time of 80min.
Because this steel grade material is harder, and institute's rolling specs is thinner, finishing train rolling load and rolling electric current are bigger in the operation of rolling, are prone to accidents when rolling, have therefore suitably reduced intermediate blank thickness than straight carbon steel, intermediate blank thickness 27mm.1500 broadbands are rolling, adopt hightension rolling when rolling, and tension force adopts 95KN, compares high approximately 20KN than same specification straight carbon steel series.Roughing extreme trace time temperature: 1025 ℃; Finish rolling finishing temperature: 880 ℃; Steel band carries out water-cooled with compact mode after going out finishing train immediately, and leading portion quickens cooling, back segment control coiling temperature, coiling temperature: 620 ℃.
Embodiment 2: Weather-resistant hot rolled broad steel strip and manufacture method thereof
1, the chemical ingredients of steel is as follows by weight percentage:
C:0.07%, Si:0.35%, Mn:0.38%, P:0.089%, S:0.006%, Cu:0.281%, Cr:0.375%, Ni:0.133%, Alt:0.015%, all the other are Fe and unavoidable impurities.
2, the manufacture method of Weather-resistant hot rolled broad steel strip, the technological process of production is with embodiment 1.
With the thick steel band of 3.8mm is example, and slab thickness is 160mm, belongs to medium thin slab.Step is as follows:
Hot metal pretreatment molten iron sulphur is controlled at below 0.010%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.Converter smelting endpoint control: C:0.04%, S:0.010%.The operation of LF refining white slag.Every stove molten steel feeding 500mSi-Ca line carries out calcification processing, soft blow argon 14 minutes.The cast of sheet billet continuous casting whole process protection, covering slag adopt the west, Henan to protect low melting point, the low viscosity container plate privacy protection slag that metallurgical material Group Co.,Ltd produces.The crystallizer cooling water inflow is constant, and inflow temperature is increased to 30-33 ℃; Two cold employings are weak cold, and the specific water gets 0.91/kg.Control each section pulling rate than straight carbon steel low 20%.This steel grade Cu content is higher, therefore at neutral atmosphere internal heating, accelerates heat-up rate during heating, improves Heating temperature, shortens steel billet high temperature time inside furnace.Suitably reduce soaking temperature to 1240 ℃ than straight carbon steel.In the production process, under the hot-loading and hot-conveying condition, the tapping temperature of slab is: 1200 ℃, and hot charging condition following heat-up time of 80min, cold charge condition following heat-up time of 90min.
Because this steel grade material is harder, and institute's rolling specs is thinner, finishing train rolling load and rolling electric current are bigger in the operation of rolling, are prone to accidents when rolling, have therefore suitably reduced intermediate blank thickness than straight carbon steel, intermediate blank thickness 26mm.1500 broadbands are rolling, adopt hightension rolling when rolling, and tension force adopts 100KN, compares high approximately 20KN than same specification straight carbon steel series.Roughing extreme trace time temperature: 1020 ℃; Finish rolling finishing temperature: 870 ℃; Steel band carries out water-cooled with compact mode after going out finishing train immediately, and leading portion quickens cooling, back segment control coiling temperature, coiling temperature: 620 ℃.
Embodiment 3:
1, the chemical ingredients of steel is as follows by weight percentage:
C:0.08%, Si:0.37%, Mn:0.4%, P:0.094%, S:0.008%, Cu:0.307%, Cr:0.338%, Ni:0.126%, Alt:0.015%, all the other are Fe and unavoidable impurities.
Manufacture method is with embodiment 1.
The performance data of relevant wide strip is listed in the table 1, and relevant testing method adopts general international standard:
Table 1
Steel band Thickness mm Yield strength MPa Tensile strength MPa Unit elongation % Crooked Simulation atmospheric corrosion test erosion rate, g/m 2·h
Embodiment 1 6.0 425 540 32.5 D=a is qualified 1.8
Embodiment 2 3.8 408 510 40.5 D=a is qualified -
Embodiment 3 6.0 399 517 38 D=a is qualified 1.82

Claims (8)

1. Weather-resistant hot rolled broad steel strip, wherein the chemical component weight degree of steel is:
C:0.06-0.12%, Si:0.25-0.50%, Mn:0.30-0.50%, P:0.07-0.15%, the following Cu:0.25-0.40% of S:0.015%, Cr:0.30-1.2%, Ni:0.10-0.50%, Alt:0.02-0.03%, all the other are Fe and trace impurity.
2. Weather-resistant hot rolled broad steel strip as claimed in claim 1, the chemical component weight degree that it is characterized in that steel is: C:0.06-0.10%, Si:0.35-0.45%, Mn:0.35-0.50%, P:0.08-0.10%, S≤0.010%, Cu:0.25~0.35%, Cr:0.30-0.50%, Ni:0.10-0.15%, Alt:0.01-0.03%, all the other are Fe and trace impurity.
3. the manufacture method of a Weather-resistant hot rolled broad steel strip, comprise that pre-desulphurised hot metal enters top and bottom combined blown converter smelting, deoxidation and Alloying Treatment, molten steel after the smelting carries out the LF ladle refining, molten steel after refining is carried out whole process protection cast (sheet billet continuous casting) on continuous caster, it is rolling that continuously cast bloom enters 1500 broadbands again, it is characterized in that, the chemical component weight degree of steel is: C 0.06-0.12%, Si 0.25-0.50%, Mn 0.30-0.50%, P 0.07-0.15%, S is below 0.015%, Cu0.25-0.40%, Cr 0.30-1.2%, Ni 0.10-0.50%, all the other are Fe and trace impurity; Rolling employing four roll reversing rollers carry out 5 passage breaking down, and finish rolling is six tandem rolling units; The thick 26-29mm that is chosen at of intermediate blank; Tension force 80-100KN when rolling, 1020 ℃-1080 ℃ of roughing extreme trace time temperature; 870 ± 20 ℃ of finish rolling finishing temperatures; 620 ± 15 ℃ of coiling temperatures.
4. the manufacture method of Weather-resistant hot rolled broad steel strip as claimed in claim 3 is characterized in that molten iron pre-desulfurization is to adopt the winding-up Inactivate granular magnesium to carry out in iron ladle, and sulphur is controlled at below 0.015% in the molten iron, and temperature is not less than 1250 ℃.
5. the manufacture method of Weather-resistant hot rolled broad steel strip as claimed in claim 3 is characterized in that before the converter smelting corronel being added converter with steel scrap, and the slag making material added in terminal point in preceding 3 minutes, terminal point control: C≤0.06%, S<0.015%.At first at the bottom of ladle, add synthetic slag before the converter tapping and carry out wash heat, adopt silico-calcium barium, the deoxidation of aluminium manganese titanium, consumption is the 1kg/t steel, is putting steel four/for the moment, add silico-calcium barium, aluminium manganese titanium, silicomanganese, ferrosilicon, ferrophosphorus, medium carbon ferrochrome, molten steel goes out to 3/4ths o'clock to add.
6. the manufacture method of Weather-resistant hot rolled broad steel strip as claimed in claim 3 is characterized in that the LF ladle refining adopts the operation of white slag method, and feeding 500-600m/ stove silicon-calcium wire carries out calcification processing in molten steel, and the stirring of soft blow argon, calmness are time 12-20 minute after the line feeding.
7. the manufacture method of Weather-resistant hot rolled broad steel strip as claimed in claim 3; it is characterized in that the cast of sheet billet continuous casting whole process protection; crystallizer cooling and secondary cooling are all adopted weak cold; the crystallizer inflow temperature is than the high 3-6 of straight carbon steel ℃; two cold specific waters take 0.8-1.0 l/kg steel, and the control pulling rate is than straight carbon steel low 20%.
8. the manufacture method of Weather-resistant hot rolled broad steel strip as claimed in claim 3 is characterized in that the 1500mm broadband is rolling under the hot-loading and hot-conveying condition, and the tapping temperature of slab is: 1160 ℃-1210 ℃, heat-up time 80-90min.
CNB2007101132313A 2007-10-12 2007-10-12 Weather-resistant hot rolled broad steel strip and method for manufacturing the same Expired - Fee Related CN100513618C (en)

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