CN101736203B - High-strength weather-resisting hot rolled steel strip and manufacturing method thereof - Google Patents
High-strength weather-resisting hot rolled steel strip and manufacturing method thereof Download PDFInfo
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- CN101736203B CN101736203B CN2010101014376A CN201010101437A CN101736203B CN 101736203 B CN101736203 B CN 101736203B CN 2010101014376 A CN2010101014376 A CN 2010101014376A CN 201010101437 A CN201010101437 A CN 201010101437A CN 101736203 B CN101736203 B CN 101736203B
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Abstract
The invention relates to a high-strength anti-atmospheric corrosion hot rolled steel strip and a manufacturing method thereof. The hot rolled steel strip comprises the following chemical components in percentage by weight: 0.063<=C<=0.10, 0.36-0.45 of Si, 1.29-1.40 of Mn, 0.010<=P<=0.020, 0.002<=S<=0.008, 0.73-1.00 of Cr, 0.23-0.55 of Ni, 0.41-0.50 of Cu, 0.09<=Nb+V+Ti<=0.22 and the balance of Fe and other unavoidable impurities. The manufacturing method of the hot rolled steel strip comprises the following steps: A. continuous casting billet preparation is realized by hot metal pretreatment desulfuration, top and bottom combined blown converter smelting, LF refining and thick plate blank continuous casting; B. controlled rolling and controlled cooling technology are adopted to process the continuous casting billet into the hot rolled steel strip, finish rolling temperature is 790-890 DEG C, water cooling is quickly carried out to 450-650 DEG C for reeling, and then the obtained product is cooled to room temperature. The steel strip processed by the manufacturing method of the high-strength anti-atmospheric corrosion hot rolled steel strip has low hazardous element content and banded structure rank, higher comprehensive mechanical property, anti-atmospheric corrosion performance and favorable formability.
Description
Technical field
The present invention relates to a kind of high-strength weather-resistant hot rolled steel strip and method of manufacture thereof, specifically is a kind of 450MPa grade high-strength atmospheric corrosion resistant hot-rolled steel strip and method of manufacture thereof.
Background technology
Weather resisting steel is mainly used in makes the structural part that freight container, rail vehicle, station boiler corrosion barrier, oil derrick and engineering machinery etc. require atmospheric corrosion resistance, and wherein railway systems are one of weather resisting steel most important applications fields.The development trend of rail vehicle is high speed and heavy duty; Improving steel strength is the important means that reaches this target to alleviate light weight; And punching press and bending are that rail vehicle is with the topmost molding mode of weather resisting steel; Therefore, except that requiring HS, also require rail vehicle to have good processability with weather resisting steel.Existing rail vehicle when intensity improves, but exists punching press or bending crack phenomenon with weather resisting steel, has had a strong impact on the stably manufactured and the safe operation of rail vehicle.
On August 6th, 2008, disclosed publication number was " a kind of ys is greater than 450MPa grade ultra-low-carbon hot rolling weather-resisting steel " patent of invention of CN101235470A; A kind of high-strength weather resisting steel is provided; But contain the valuable Alloy Elements Mo of 0.30-0.48% in this steel, improved steel product cost.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing high-strength weather-resistant hot rolled steel strip, the present invention provides that a kind of cost is low, the high-strength weather-resistant hot rolled steel strip of good moldability, and the method for manufacture of this steel band is provided simultaneously.
The quality per distribution ratio of the chemical ingredients of this high-strength weather-resistant hot rolled steel strip is:
0.063≤C≤0.10 Si?0.36～0.45 Mn?1.29～1.40 0.010≤P≤0.020
0.002≤S≤0.008 Cr?0.73～1.00 Ni?0.23～0.55 Cu 0.41～0.50
0.09≤Nb+V+Ti≤0.22。
All the other are Fe and unavoidable impurities.
General width is 1000～2130mm, thickness 4.0～14.0mm.
The qualification of high-strength weather-resistant hot rolled steel strip chemical ingredients according to the invention the reasons are as follows.
The not only easy but also cheap method of intensity that improves steel is to improve C content, yet along with the raising of C content, the impelling strength of steel, welding property and processability but obviously descend.In order to make finished steel have good comprehensive performances, especially good processability should reduce C content as far as possible, must not be higher than 0.10% so limit C content.
Remedy the decline of the hot rolled strip intensity that causes because of reduction C content through Mn content in the raising steel.Mn can form displaced type sosoloid in steel, play stronger solution strengthening effect, makes the linear increase of ys and tensile strength.In addition, Mn is an austenite former, has the effect of stable austenite, can reduce austenite transformation temperature (Ar3), improves the ferritic nucleation rate, reduces grain growth speed, promptly has the effect of crystal grain thinning.But Mn content improves the C equivalent (Ceq) that can make steel and increases, and is unfavorable to welding property.In order comprehensively to improve obdurability and to take into account welding and processability, should suitably improve Mn content.Therefore, Mn content is limited to the 0.70-1.40% scope.
The solution strengthening coefficient ratio Mn of Si in ferritic is high, and Si is very effective to improving intensity, but reduces the impelling strength and the processability of steel, adopts the amplitude of Si alloying limited.For this reason, Si content is limited to the 0.15-0.45% scope.
P is deleterious to impelling strength, welding property and the processability of steel.P is prone to separate out and form Fe in steel
3P increases the fragility of steel, particularly reduces the low-temperature impact toughness of steel tempestuously; P can worsen the welding property of steel; The velocity of diffusion of P in γ iron and α iron is little in addition, is prone to form segregation, thereby the processability of steel is caused disadvantageous effect.Strict because of hot rolled strip of the present invention to the welding performance requriements, therefore its P content is limited in below 0.020%.
Can cause steel to produce " hot-short " defective when S content is higher, the Mn that adds in the steel can form the MnS plastic occluded foreignsubstance with S, alleviates the harmful effect of S.But the MnS that in the operation of rolling, extends along rolling direction is prone to make steel band to form banded structure, reduces the transverse impact toughness and the processability of steel band.S is also extremely harmful to the solidity to corrosion of steel, and the sulfide in the steel can become the source region of corrosion, and therefore limiting S content must not be higher than 0.008%.
Cr, Ni, Cu element can play solution strengthening effect in various degree in steel, wherein Ni also can improve the low-temperature impact toughness of steel, but the main purpose that adds these elements is to give the finished product hot rolled strip good atmospheric corrosion resistance.An amount of combination of Cr, Ni, Cu element can make steel obtain good atmospheric corrosion resistance, for this limits as follows Cr, Ni, Cu constituent content: 0.35%≤Cr≤1.00%, 0.15%≤Ni≤0.55%, 0.25%≤Cu≤0.50%.
The Nb, V, carbide, nitride or the carbon of Ti, the nitrogen compound that in heat-processed, are dissolved in the austenite can effectively stop austenite crystal to magnify, and this can play active effect to the welding property of improving steel.In many reinforcement means such as solution strengthening, phase transformation strengthening, dislocations strengthening, precipitation strength and refined crystalline strengthening; Refined crystalline strengthening is to improve the strength of materials and flexible unique method simultaneously; Be the very important schedule of reinforcement of ferrous materials, adding micro alloying elements such as Nb, V, Ti then is the important means that this mechanism is played one's part to the full.Carbide, nitride or carbon, the nitrogen compound of the Nb of the more small and dispersed of on ferrite matrix, separating out after the phase transformation, V, Ti have then played the precipitation strength effect.For making the effectively above-mentioned effect of performance of Nb, V, Ti element, limit the Nb+V+Ti total amount and be not higher than 0.22%.
This high-strength weather-resistant hot rolled steel strip and method of manufacture thereof comprise following sequential steps:
A prepares continuously cast bloom
Through molten iron pretreatment desulfurizing, top bottom blowing converter smelting, LF refining and sheet billet continuous casting, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
0.063≤C≤0.10 Si?0.36～0.45 Mn?1.29～1.40 0.010≤P≤0.020
0.002≤S≤0.008?Cr?0.73～1.00 Ni?0.23～0.55 Cu?0.41～0.50
0.09≤Nb+V+Ti≤0.22。
All the other are Fe and unavoidable impurities.
B adopts controlled rolling and technology for controlled cooling that continuously cast bloom is processed into hot rolled strip
Continuously cast bloom heats in walking beam furnace, 1200 ℃-1220 ℃ of Heating temperatures, and soaking time 2.5 hours-3 hours makes the austenite homogenizing; Continuously cast bloom is through the roughing and the hot-work in two stages of finish rolling, and producing thickness range is the finished product hot rolled strip of 4.0～14.0mm, and 790～870 ℃ of hot rolled strip finishing temperatures are to realize ausrolling.After the hot rolled strip finish to gauge fast water-cooled to 450～600 ℃ batch, obtaining the precipitate of tiny and uniform ferrite crystal grain and disperse, and then in air cool to room temperature.
This high-strength weather-resistant hot rolled steel strip and method of manufacture thereof; Be rational Match through chemical ingredients and controlled rolling, technology for controlled cooling system; Produce a kind of low-cost high-strength atmospheric corrosion resistant hot-rolled steel strip; Its harmful element content and banded structure rank are lower, have good processability.
Table 1 is seen in the contrast of hot rolled strip of the present invention and CN101235470A patent of invention product mechanical property, processability.
Can be found out that by table 1 ys of contrast patented product is 450-495MPa, tensile strength does
Table 1 hot rolled strip of the present invention and the comparison that contrasts patented product mechanical property, processability
583～638MPa;-40 ℃ of Charpy-V impact power 86～129J; The ys of hot rolled strip of the present invention is 485～525MPa, and tensile strength is 595-645MPa ,-40 ℃ of Charpy-V impact power 215～289J; This explanation hot rolled strip of the present invention has higher intensity and impelling strength, and the obdurability coupling better.The unit elongation of contrast patented product is 22～26%, and the unit elongation of hot rolled strip of the present invention is 26～32.5%, and the plasticity of hot rolled strip of the present invention is higher.The yield tensile ratio of contrast patented product is 0.76～0.84; 180 ° of d=a cold bending tests are intact; The yield tensile ratio of hot rolled strip of the present invention is that 0.75～0.83,180 ° of d=0 cold bending tests are intact, and adopting width in addition is that the sample of 1000mm carries out 180 ° of d=0 cold bending tests; The result is intact, and this explanation hot rolled strip of the present invention has processability preferably.In a word, hot rolled strip of the present invention has higher comprehensive mechanical property and good processability, is that raw material is made rail vehicle with it, can effectively avoid punching press or bending crack phenomenon, and active effect is played in the stably manufactured and the safe operation that ensure rail vehicle.
Embodiment
Specify the embodiment of this high-strength weather-resistant hot rolled steel strip and method of manufacture thereof below in conjunction with embodiment, but the embodiment of this high-strength weather-resistant hot rolled steel strip and method of manufacture thereof is not limited to following embodiment.
The working condition of following embodiment is the hot metal pretreatment facility, 180 tons of top bottom blowing converters, LF a refining unit, slab caster, semi continuous hot rolled strip production line.
The atmospheric corrosion resistant hot-rolled steel strip chemical analysis method is GB/T 223, sampling method GB/T 20066.
Atmospheric corrosion resistant hot-rolled steel strip tensile property method of inspection GB/T 228, sampling method GB/T 2975.
Atmospheric corrosion resistant hot-rolled steel strip impelling strength method of inspection GB/T 229, sampling method GB/T 2975.
Atmospheric corrosion resistant hot-rolled steel strip cold-bending property method of inspection GB/T 232, sampling method GB/T 2975.
Atmospheric corrosion resistant hot-rolled steel strip banded structure method of inspection GB/T 13299, sampling method GB/T 13298.
Check of atmospheric corrosion resistant hot-rolled steel strip atmospheric corrosion resistance and sampling method TB/T 2375.
Steel band embodiment one
Present embodiment high-strength weather-resistant hot rolled steel strip thickness 4.0mm, the quality per distribution ratio of chemical ingredients is:
C：0.051 Si：0.24 Mn：1.01 P：0.009 S：0.004
Cr:0.66 Ni:0.21 Cu:0.40 Nb+V+Ti:0.07, all the other are Fe and unavoidable impurities.
Present embodiment hot rolled strip mechanical property, processability and banded structure test result are seen table 2, and the atmospheric corrosion resistance test result is seen table 3.
Table 2
Table 3
Steel band embodiment two
The good formability atmospheric corrosion resistant hot-rolled steel strip of present embodiment HS thickness 8.0mm, the quality per distribution ratio of chemical ingredients is:
C：0.063 Si：0.36 Mn：1.29 P：0.010 S：0.002
Cr:0.73 Ni:0.23 Cu:0.41 Nb+V+Ti:0.09, all the other are Fe and unavoidable impurities.
Present embodiment hot rolled strip mechanical property, processability and banded structure test result are seen table 2, and the atmospheric corrosion resistance test result is seen table 3.
Steel band embodiment three
The good formability atmospheric corrosion resistant hot-rolled steel strip of present embodiment HS thickness 14.0mm, the quality per distribution ratio of chemical ingredients is:
C：0.056 Si：0.23 Mn：1.40 P：0.011 S：0.002
Cr:0.69 Ni:0.22 Cu:0.43 Nb+V+Ti:0.13, all the other are Fe and unavoidable impurities.
Present embodiment hot rolled strip mechanical property, processability and banded structure test result are seen table 2, and the atmospheric corrosion resistance test result is seen table 3.
Method of manufacture embodiment one
The present embodiment manufacturing be steel band embodiment one, the method for manufacture of present embodiment comprises following sequential steps:
A prepares continuously cast bloom
Through molten iron pretreatment desulfurizing, 180 tons of top bottom blowing converter smeltings, LF refining and sheet billet continuous castings, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.051 Si：0.24 Mn：1.01 P：0.009 S：0.004
Cr:0.66 Ni:0.21 Cu:0.40 Nb+V+Ti:0.07, all the other are Fe and unavoidable impurities.
B adopts controlled rolling and technology for controlled cooling that continuously cast bloom is processed into hot rolled strip
Continuously cast bloom is heated to 1230 ℃ in walking beam furnace, soaking time 3 hours.Continuously cast bloom is through the roughing and the hot-work in two stages of finish rolling, and producing thickness is the finished product hot rolled strip of 4.0mm, 880 ℃ of hot rolled strip finishing temperatures.After the hot rolled strip finish to gauge fast water-cooled to 620 ℃ batch, and then in air cool to room temperature.
Present embodiment hot rolled strip mechanical property, processability and banded structure test result are seen table 2, and the atmospheric corrosion resistance test result is seen table 3.
Method of manufacture embodiment two
The present embodiment manufacturing be steel band embodiment two, the method for manufacture of present embodiment comprises following sequential steps:
A prepares continuously cast bloom
Through molten iron pretreatment desulfurizing, 180 tons of top bottom blowing converter smeltings, LF refining and heavy slab continuous castings, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.063 Si：0.36 Mn：1.29 P：0.010 S：0.002
Cr:0.73 Ni:0.23 Cu:0.41 Nb+V+Ti:0.09, all the other are Fe and unavoidable impurities.
B adopts controlled rolling and technology for controlled cooling that continuously cast bloom is processed into hot rolled strip
Continuously cast bloom is heated to 1220 ℃ in walking beam furnace, soaking time 3 hours.Continuously cast bloom is through roughing and the hot-work in two stages of finish rolling, and producing thickness is the finished product hot rolled strip of 8.0mm, 870 ℃ of hot rolled strip finishing temperatures, quick water-cooled to 600 ℃ is batched after the hot rolled strip finish to gauge, and then in air cool to room temperature.
Present embodiment hot rolled strip mechanical property, processability and banded structure test result are seen table 2, and the atmospheric corrosion resistance test result is seen table 3.
Method of manufacture embodiment three
The present embodiment manufacturing be steel band embodiment three, the method for manufacture of present embodiment comprises following sequential steps:
A prepares continuously cast bloom
Through molten iron pretreatment desulfurizing, 180 tons of top bottom blowing converter smeltings, LF refining and heavy slab continuous castings, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.056 Si：0.23 Mn：1.40 P：0.011 S：0.002
Cr:0.69 Ni:0.22 Cu:0.43 Nb+V+Ti:0.13, all the other are Fe and unavoidable impurities.
B adopts controlled rolling and technology for controlled cooling that continuously cast bloom is processed into hot rolled strip
Continuously cast bloom is heated to 1220 ℃ in walking beam furnace, soaking time 3 hours.Continuously cast bloom is through roughing and the hot-work in two stages of finish rolling, and producing thickness is the finished product hot rolled strip of 14.0mm, 860 ℃ of hot rolled strip finishing temperatures, quick water-cooled to 580 ℃ is batched after the hot rolled strip finish to gauge, and then in air cool to room temperature.
Claims (3)
1. high-strength weather-resistant hot rolled steel strip, the quality per distribution ratio of its chemical ingredients does;
0.063≤C≤0.10 Si?0.36～0.45 Mn?1.29～1.40 ?0.010≤P≤0.020
0.002≤S≤0.008 Cr?0.73～1.00 Ni?0.23～0.55 Cu?0.41～0.50
0.09≤Nb+V+Ti≤0.22; All the other are Fe and unavoidable impurities.
2. the method for manufacture of the described high-strength weather-resistant hot rolled steel strip of claim 1, it comprises following sequential steps:
A prepares continuously cast bloom
Through molten iron pretreatment desulfurizing, top bottom blowing converter smelting, LF refining and sheet billet continuous casting, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
0.063≤C≤0.10 Si?0.36～0.45 Mn?1.29～1.40 0.010≤P≤0.020
0.002≤S≤0.008 Cr?0.73～1.00 Ni?0.23～0.55 Cu?0.41～0.50
0.09≤Nb+V+Ti≤0.22; All the other are Fe and unavoidable impurities;
B adopts controlled rolling and technology for controlled cooling that continuously cast bloom is processed into hot rolled strip.
3. according to the method for manufacture of the described high-strength weather-resistant hot rolled steel strip of claim 2, it is characterized in that: continuously cast bloom heats in walking beam furnace, 1200 ℃-1220 ℃ of Heating temperatures, and soaking time 2.5 hours-3 hours makes the austenite homogenizing; Continuously cast bloom is through the roughing and the hot-work in two stages of finish rolling; Producing thickness range is the finished product hot rolled strip of 4.0～14.0mm; 790～870 ℃ of hot rolled strip finishing temperatures, realizing ausrolling, after the hot rolled strip finish to gauge fast water-cooled to 450～600 ℃ batch; Obtaining the precipitate of tiny and uniform ferrite crystal grain and disperse, and then in air cool to room temperature.
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| CN103302255B (en) * | 2012-03-14 | 2015-10-28 | 宝山钢铁股份有限公司 | A kind of thin strap continuous casting 700MPa level high-strength air corrosion-resistant steel manufacture method |
| CN110055461A (en) * | 2019-04-25 | 2019-07-26 | 首钢集团有限公司 | A kind of electric tower weathering steel and preparation method thereof |
| CN111560567A (en) * | 2020-06-29 | 2020-08-21 | 攀钢集团研究院有限公司 | Steel for assembly type steel structure and preparation method thereof |
| CN114645199B (en) * | 2022-03-04 | 2023-02-21 | 包头钢铁（集团）有限责任公司 | Q355NHD steel plate and production method thereof |
| CN114657479B (en) * | 2022-05-11 | 2023-05-16 | 马鞍山钢铁股份有限公司 | Hot-rolled corrosion-resistant steel with thick specification, high strength and excellent low-temperature toughness, and manufacturing method and application thereof |
| CN115976396B (en) * | 2022-12-30 | 2024-04-30 | 包头钢铁（集团）有限责任公司 | High-strength corrosion-resistant hot rolled steel strip Q550NQR1 for container and production method thereof |
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Non-Patent Citations (1)
| Title |
|---|
| 文小明.铁道货车用Q450NQR1高强钢的研制开发.《第4届中国金属学会青年学术年会议文集》.2008,152-156. * |
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