CN101135030B - Weather-resistant hot rolled narrow steel strip and method for manufacturing same - Google Patents

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

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Publication number
CN101135030B
CN101135030B CN2007101132328A CN200710113232A CN101135030B CN 101135030 B CN101135030 B CN 101135030B CN 2007101132328 A CN2007101132328 A CN 2007101132328A CN 200710113232 A CN200710113232 A CN 200710113232A CN 101135030 B CN101135030 B CN 101135030B
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steel
weather
steel strip
hot rolled
rolling
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CN2007101132328A
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Chinese (zh)
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CN101135030A (en
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周平
汤化胜
亓伟伟
郭伟达
费燕
于全成
王奉县
王腾飞
杨旭
闫志华
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莱芜钢铁集团有限公司
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Abstract

The present invention relates to one kind of weather resistant hot roller narrow steel strip for welded structure and its production process. The steel strip has the chemical composition comprising C 0.07-0.12 wt%, Si 0.25-0.50 wt%, Mn 0.30-0.50 wt%, P 0.07-0.15 wt%, S less than 0.035 wt%, Cu 0.25-0.40 wt%, Cr 0.30-1.2 wt%, Ni 0.10-0.50 wt%, and Fe and inevitable impurity for the rest. It is produced through smelting in a top blown converter, LF refining, continuously casting steel strip billet and hot rolling in a continuous rolling mill train. It has high purity, excellent corrosion resistance, excellent welding performance and homogeneous mechanical performance. It may be applied in making square welded tube or other accessories for container.

Description

A kind of Weather-resistant hot rolled narrow steel strip and manufacture method thereof
Technical field
The present invention relates to a kind of weathering steel and manufacture method thereof, belong to the low alloy steel technical field, be specifically related to a kind of freight container welding assembly Weather-resistant hot rolled narrow steel strip and manufacture method thereof.
Background technology
Weathering steel is the common name of the steel grade of a class atmospheric corrosion resistance, prior art generally adopts adds alloying elements such as a large amount of Cu, P, Cr, Ni, Al in steel, the also interpolation As, Ce, Co, the elements such as Ti, V that have are with weathering resistance and the suitable intensity of acquisition that improves steel.Chinese patent file CN1752260, application number 200510012897.0 disclose a kind of " hot-rolling double-phase weather-resistant steel plate and manufacture method thereof ", this specification sheets has been put down in writing some basic characteristics and the purposes of weathering steel, contain Fe and 0.05-0.12%C, 0.05-0.15%P, 0.1-0.4%Cu, Cr, Ni, Ti, elements such as V, Nb in the described steel plate composition, tensile strength is greater than 680MPa, yield strength is greater than 360MPa, unit elongation is greater than 25%, work hardening exponent n value is greater than 0.20, yield tensile ratio is less than 0.60, and welded heat affecting zone tensile strength is greater than 550MPa.Chinese patent file CN1970818, application number 200610125365.2 disclose " a kind of high-strength weathering steel and production method thereof ", it adopts utmost point low-carbon (LC), the adding of Cu-Cr-Ni-Mo-Nb and two or more the compound interpolation among the Ti-Al-Zr in the composition design, carbon content is controlled at 0.01-0.04%, tensile strength adopts the production of quenching+tempering process greater than 690MPa.Though the weathering steel that provides in the above-mentioned patent documentation has improved the performance of steel, cost is too high, and technological process of production complexity, and there is bigger difficulty in the marketization.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of Weather-resistant hot rolled narrow steel strip and manufacture method thereof are provided, belong to the weather-proof steel of low-alloy, this narrow steel strip is specially adapted to the freight container welding assembly, and cost is low, and industrialization is easy.
Technical scheme of the present invention is as follows:
Weather-resistant hot rolled narrow steel strip, wherein the chemical component weight degree of steel is:
C:0.07-0.12%,, Si:0.25-0.50%, Mn:0.30-0.50%, P:0.07-0.15%, below the S:0.035%, Cu:0.25-0.40%, Cr:0.30-1.2%, Ni:0.10-0.50%, all the other are Fe and unavoidable impurities.
Determining of steel grades of the present invention taken into account the corrosion resistance nature of hot rolled strip, higher requirement of strength and welding property requirement simultaneously, promptly considers bigger element P, Cu, Cr and intensity Elements C, Si, the Mn of steel band erosion resistance influence answered reasonable ratio.Based on the requirement of steel band corrosion resistance nature, P, Cu, Cr are controlled in the following scope: P 0.07-0.15%, Cu0.25-0.40%, Cr:0.30-1.2%; For satisfying the requirement of welding property, carbon content is controlled at 0.07-0.12%; 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 composition of 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:0.07-0.10%, Si:0.25-0.40%, Mn:0.35-0.50%, P:0.08-0.12%, S≤0.030%, Cu:0.25-0.35%, Cr:0.40-0.60%, Ni:0.12-0.20%, all the other are Fe and unavoidable impurities.
The manufacture method of Weather-resistant hot rolled narrow steel strip of the present invention comprises that molten iron pre-desulfurization, top blown converter smelting, LF ladle refining, band continuous-casting of steel billet, full hot continuous rolling unit are rolling; It is characterized in that, the chemical component weight degree of steel is: C:0.07-0.12%, Si:0.25-0.50%, Mn:0.30-0.50%, P:0.07-0.15% is below the S:0.035%, Cu:0.25-0.40%, Cr:0.30-1.2%, Ni:0.10-0.50%, all the other are Fe and unavoidable impurities.Steel billet under the hot-loading and hot-conveying condition, 1150 ℃-1200 ℃ of the tapping temperatures of slab, heat-up time 80-90min; 850-880 ℃ of finish rolling finishing temperature; Coiling temperature: 620-640 ℃.
Further preferred, can consider following processing condition:
1, the manufacture method of above-mentioned Weather-resistant hot rolled narrow steel strip, wherein molten iron pre-desulfurization is to adopt the winding-up Inactivate granular magnesium to carry out in iron ladle, and molten iron sulphur is controlled at below 0.035%, temperature is not less than 1250 ℃.
2, the manufacture method of above-mentioned Weather-resistant hot rolled narrow steel strip, wherein the converter smelting operation step is as follows:
Pre-desulphurised hot metal enters converter smelting, before smelting corronel is added converter with steel scrap, and the slag making material added in terminal point in preceding 3 minutes.Terminal point control C≤0.07%, S≤0.035%.At first at the bottom of ladle, add 200kg half fritting synthetic slag before the converter tapping and carry out wash heat.Adopt Si-Al-Ca-Ba, steel core aluminium deoxidation, consumption is respectively 1.5kg/t steel, 0.4kg/t steel, is putting steel four/for the moment, add Si-Al-Ca-Ba, steel core aluminium, silicomanganese, ferrosilicon, ferrophosphorus, medium carbon ferrochrome, and molten steel goes out to 3/4ths o'clock to add.
3, the manufacture method of above-mentioned Weather-resistant hot rolled narrow steel strip, wherein the LF ladle refining is in order to improve purity of steel, the present invention has added LF ladle refining operation in Production Flow Chart, adopt the operation of white slag method.In order to guarantee that molten steel has good casting properties, improve the quality of steel, feeding 150-160m/ stove silicon-calcium wire carries out calcification processing in molten steel, and the stirring of soft blow argon, calmness are time 6-10 minute after the line feeding, thereby have reduced the probability of casting process nozzle clogging.
4, the manufacture method of above-mentioned Weather-resistant hot rolled narrow steel strip, wherein be with the continuous-casting of steel billet processing condition as follows:
Band continuous-casting of steel billet machine specifications section 120mm * (285mm, 360mm, 435mm), the whole process protection cast, covering slag adopts the west, Henan to protect the container plate privacy protection slag that metallurgical material Group Co.,Ltd produces.Be to guarantee continuous casting billet quality, reduce crackle, crystallizer cooling and secondary cooling are all adopted weak cold, and the crystallizer inflow temperature is than the high 3-6 of straight carbon steel ℃, and intensity of secondary cooling reduces 20% than straight carbon steel (as Q235B etc.), and the specific water takes the 0.8-1.0l/kg steel.Pulling rate is than straight carbon steel low 20%.
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 manufacture method of above-mentioned Weather-resistant hot rolled narrow steel strip, the wherein complete full tandem rolling unit of rolling preferred the employings 500mm of hot continuous rolling unit production line, comprise hold that the inlet side goes out, 1 of walking beam, accumulation of heat three-stage heating furnace; The roughing unit is two roller unidirectional types, and wherein edger roll is 3,5 of plain-barreled rolls; Finishing train is four roller unidirectional types, and wherein the edger roll machine is 1, and the edger roll machine adopts the short stress path rolling mill of high rigidity, accurately the control width tolerance is in-1.0-+2.0mm scope, 7 of plain-barreled rolls, plain-barreled roll machine roll length 600mm makes product limit width increase to 483mm by original 353mm.
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: 1150 ℃-1200 ℃, heat-up time 80-90min.
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.The minimizing of steel band Cr of the present invention, two alloy amounts of Ni reduces the steel grade cost, and atmospheric corrosion resistance is respond well, and the purity of steel height, welding property is good, intensity is higher, good moldability, meets freight container manufacturing user's requirement.Adopt full tandem rolling unit Rolling Production efficient height.
Steel band mechanical property of the present invention is as follows: the average 361MPa of yield strength, the average 530MPa of tensile strength, unit elongation 35.5%.This composition of steel control (weight percent): C0.10%, Si0.33%, Mn0.38%, P0.100%, S0.021%, Cu0.30%, Cr0.53%, Ni0.12%, 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/L NaCl 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: 1.9 gram/rice 2Hour, be equivalent to 48.2% of the straight carbon steel (Q235B) produced with the bar production line, fine corrosion resistance.
Use freight container appurtenances such as the weather-proof narrow steel strip of the present invention side of making rectangle welded tube, can be used for substituting with the kind roll bending; Reduce manufacturing procedures such as the user cuts out, itemize, reduced manufacturing cost.
Embodiment
The present invention will be further described below in conjunction with embodiment, but be not limited thereto.
Embodiment 1, specification are 3.0mm * 285mm steel band, casting blank specification 120mm * 285mm.
1, the chemical ingredients of steel is as follows by weight percentage:
C:0.10%, Si:0.33%, Mn:0.38%, P:0.100%, S:0.021%, Cu:0.30%, Cr:0.53%, Ni:0.12%, all the other are Fe and unavoidable impurities.
2, the manufacture method of Weather-resistant hot rolled narrow steel strip
Operational path is as follows:
Hot metal pretreatment-40t top blown converter smelting-LF ladle refining-band continuous-casting of steel billet-500mm is complete, and the hot continuous rolling unit is rolling.
Molten iron pre-desulfurization is to adopt the winding-up Inactivate granular magnesium in iron ladle, makes that sulphur is controlled at below 0.025% in the molten iron, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.40t top blown converter smelting endpoint control C:0.06%, S≤0.030%.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.At first at the bottom of ladle, add 200kg half fritting synthetic slag before the converter tapping and carry out wash heat.Adopt Si-Al-Ca-Ba, steel core aluminium deoxidation, consumption is respectively 1.5kg/t steel, 0.4kg/t steel, is putting steel four/for the moment, add Si-Al-Ca-Ba, steel core aluminium, silicomanganese, ferrosilicon, ferrophosphorus, medium carbon ferrochrome, and molten steel goes out to 3/4ths o'clock to add.The LF ladle refining adopts the white slag operation, and with silico-calcium, composite deoxidant deoxidation, the white slag hold-time was not less than 6 minutes.Every stove steel feeding 150m Si-Ca line carries out calcification processing, soft blow argon 6-7 minute, and the calm time is not less than 6 minutes.The cast of band continuous-casting of steel billet whole process protection, covering slag adopts 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 0.9l/kg.The control pulling rate is lower by 20% than straight carbon steel, and the highest pulling rate is no more than 1.8m/min.
The full hot continuous rolling unit of 500mm rolling technology condition is as follows:
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.990 ℃ of preheating section temperature, 1130 ℃ of heating zone temperature suitably reduce soaking temperature to 1240 ℃ than straight carbon steel, and the tapping temperature of slab is 1200 ℃, hot charging condition following heat-up time of 80min, cold charge condition following heat-up time of 90min.880 ℃ of finishing temperatures; 620 ℃ of coiling temperatures are forbidden water-cooled in the coiling process.This steel grade intensity is higher, and three drafts increase by 5% than straight carbon steel after the operation of rolling finish rolling.
Embodiment 2, specification are 2.8mm * 222mm steel band, casting blank specification 120mm * 285mm.
1, the chemical ingredients of steel is as follows by weight percentage:
C:0.08%, Si:0.29%, Mn:0.36%, P:0.103%, S:0.026%, Cu:0.282%, Cr:0.49%, Ni:0.132%, all the other are Fe and unavoidable impurities.
Manufacture method is with embodiment 1.
The steel band mechanical property of table 1. embodiment 1 and embodiment 2

Claims (4)

1. the manufacture method of Weather-resistant hot rolled narrow steel strip comprises molten iron pre-desulfurization, and top blown converter is smelted, the LF ladle refining, and the band continuous-casting of steel billet, full hot continuous rolling unit is rolling; The chemical component weight degree of steel is:
C:0.07-0.12%, Si:0.25-0.50%, Mn:0.30-0.50%, P:0.07-0.15%, below the S:0.035%, Cu:0.25-0.40%, Cr:0.30-1.2%, Ni:0.10-0.50%, all the other are Fe and unavoidable impurities; Steel billet under the hot-loading and hot-conveying condition, 1150 ℃-1200 ℃ of the tapping temperatures of slab, heat-up time 80-90min; 850-880 ℃ of finish rolling finishing temperature; Coiling temperature: 620-640 ℃; It is characterized in that,
Described LF ladle refining adopts the operation of white slag method, and feeding 150-160m/ stove silicon-calcium wire carries out calcification processing in molten steel, and the stirring of soft blow argon, calmness are time 6-10 minute after the line feeding;
Adopt the full tandem rolling unit of 500mm rolling, comprise that the end inlet side goes out, 1 of walking beam, accumulation of heat three-stage heating furnace; The roughing unit is two roller unidirectional types, and wherein edger roll is 3,5 of plain-barreled rolls; Finishing train is four roller unidirectional types, and wherein the edger roll machine is 1, and the edger roll machine adopts the short stress path rolling mill of high rigidity, accurately controls width tolerance-1.0-+2.0,7 in plain-barreled roll machine, plain-barreled roll machine roll length 600mm.
2. the manufacture method of Weather-resistant hot rolled narrow steel strip according to claim 1 is characterized in that the chemical component weight degree of steel is:
C:0.07-0.10%, Si:0.25-0.40%, Mn:0.35-0.50%, P:0.08-0.12%, S≤0.030%, Cu:0.25-0.35%, Cr:0.40-0.60%, Ni:0.12-0.20%, all the other are Fe and unavoidable impurities.
3. the manufacture method of Weather-resistant hot rolled narrow steel strip according to claim 1 is characterized in that, described molten iron pre-desulfurization is to adopt the winding-up Inactivate granular magnesium to carry out in iron ladle, and molten iron sulphur is controlled at below 0.035%, and temperature is not less than 1250 ℃.
4. the manufacture method of Weather-resistant hot rolled narrow steel strip according to claim 1 is characterized in that described converter smelting operation step is as follows:
Pre-desulphurised hot metal enters converter smelting, before smelting corronel is added converter with steel scrap, and the slag making material added in terminal point in preceding 3 minutes; Terminal point control C≤0.07%, S≤0.035%; At first at the bottom of ladle, add 200kg half fritting synthetic slag before the converter tapping and carry out wash heat; Adopt Si-Al-Ca-Ba, steel core aluminium deoxidation, consumption is respectively 1.5kg/t steel, 0.4kg/t steel, is putting steel four/for the moment, add Si-Al-Ca-Ba, steel core aluminium, silicomanganese, ferrosilicon, ferrophosphorus, medium carbon ferrochrome, and molten steel goes out to 3/4ths o'clock to add.
CN2007101132328A 2007-10-12 2007-10-12 Weather-resistant hot rolled narrow steel strip and method for manufacturing same CN101135030B (en)

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