CN101654765B - Gap-free hot-rolled steel strip - Google Patents
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Abstract
The invention relates to an interstitial-free hot-rolled steel strip and a manufacturing method thereof, and the hot-rolled steel strip comprises the following chemical components by weight percent: C: more than 0 and not more than 0.0013; N: more than 0 and not more than 0.0015; Si: more than 0 and not more than 0.01; Mn: 0.10-0.15; P: more than 0 and not more than 0.006 S: more than 0 and not more than 0.005; Al: 0.02-0.03; Ti: more than 0 and not more than 0.051; Cr: more than 0 and not more than 0.01; Ni: more than 0 and not more than 0.01; Cu: more than 0 and not more than 0.01; Mo: more than 0 and not more than 0.01; and the balance of Fe and inevitable impurities. The manufacturing method of the steel strip comprises the following steps: A preparing a continuous casting slab by hot metal pretreatment for desulphurization, smelting by a top and bottom combined blowing converter, RH refining and thick slab continuous casting; and B adopting the traditional hot continuous rolling for processing the continuous casting slab into the hot-rolled steel strip at the finishing rolling temperature of 880-930 DEG C, carrying out water cooling to 680-750 DEG C rapidly for winding and then cooling to the room temperature. The steel strip manufactured by the interstitial-free hot-rolled steel strip manufacturing method has the advantages of lower strength, higher plasticity and good processing technology.
Description
Technical field
The present invention relates to a kind of interstitial-free hot-rolled steel strip and method of manufacture thereof.
Background technology
Automotive industry is the mainstay industry of developed country's economy all the time, also is the important industry of some developing countries.Since calendar year 2001,, the demand of automobile steel has been risen significantly along with the fast development of Domestic Automotive Industry.Automobile steel is main with steel plate still at present, and wherein car accounts for 50% of car gross weight with steel plate weight.The used steel plate of car component; Need through impact briquetting with majorities such as steel plate, boot-lid panel, door skin, front and back fender, roof panels, underbody and test boards like engine shield; And for simplifying the car body assembling; Further improve car overall performance and safety performance, the car component develop to the combination forming direction, and this just has higher requirement to the processability of steel plate.For adapting to this development trend, car uses steel plate by using steel, use steel to develop into Ultra-low carbon, nitrogen IF steel with carbon aluminium-killed steel as the s-generation punching press of representative to use steel as the third generation punching press of representative as the first-generation punching press of representative with the low-carbon (LC) rimming steel.
IF steel (Interstitial Free Steel) is a gapless atomic steel; Be in ultralow C, N steel, to add a certain amount of Nb or Ti or Nb, Ti alloying element; Make C in the steel, N atom be fixed to carbide, nitride; And the steel grade that gap-free atom exists in the steel, the IF steel has extremely good deep drawability.Though automobile with the IF steel how with cold rolling, annealing or the delivery of zinc-plated state; But because the raw material of cold-rolled steel strip is a hot rolled strip; The tissue of hot rolled strip and performance can be hereditary to cold-rolled steel strip; Hot rolled strip will cause cold-rolled products stamping cracking generation waste product if having that crystal grain is thick excessively, crystal grain is meticulous or tissue signature and the not high performance characteristic of plasticity such as crystal grain is inhomogeneous when serious.The plasticity of hot rolled strip has material impact to the deep drawability of finished product cold-rolled steel strip.Though disclose the patent of invention of multinomial relevant IF steel now, only had a plasticity relevant with hot rolled strip.On June 6th, 2007, the disclosed patent No. was " a kind of CSP is produced the production technique of IF steel " patent of invention of CN1974824; A technology of producing Ti microalloying IF steel based on converter-CSP abbreviated system route is provided; Wherein the ys of IF hot rolled strip is 265-285MPa, and tensile strength is 340-365MPa, and unit elongation is 35%-43%; The intensity of this hot rolled strip is higher; Plasticity is lower, is 36.5%-42% as the unit elongation of the cold rolling finished product of raw material production, and average n value is 0.22-0.23; Average r value is 1.48-1.81; Its plasticity and deep drawability are not high, can only be used as commercial grade (CQ), common punch level (DQ), the deep-draw low group of drawing steel plates such as (DDQ) of arbitrarily downgrading, and not meet extra-deep drawing level (EDDQ), super extra-deep drawing level (S-EDDQ), senior extra-deep drawing level higher group of drawing steel plates such as (H-EDDQ) to the punching press performance demands.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing interstitial-free hot-rolled steel strip and method of manufacture thereof, it is lower to the invention provides a kind of intensity, and the interstitial-free hot-rolled steel strip that plasticity is higher provides the method for manufacture of this steel band simultaneously.
The mass percent of the chemical ingredients of this interstitial-free hot-rolled steel strip is:
0＜C≤0.0013 0＜N≤0.0015 0＜Si≤0.01 Mn：0.10-0.15
0＜P≤0.006 0＜S≤0.005 Al：0.02-0.03 0＜Ti≤0.051
0＜Cr≤0.01 0＜Ni≤0.01 0＜Cu≤0.01 0＜Mo≤0.01
All the other are Fe and unavoidable impurities.
General width is 1000～2130mm, thickness 3.0-5.0mm.
The qualification of interstitial-free hot-rolled steel strip chemical ingredients of the present invention the reasons are as follows:
C forms interstitial solid solution in steel, have significant solution strengthening effect, and along with the raising of C content, the ys of steel, tensile strength and hardness increase, but plasticity and processability obviously descend.Along with the raising of solid solution C content in the steel, < 111>texture density reduces, and finished product timeliness tendency strengthens.Therefore, limit C content and must not be higher than 0.0013%.
N is the same with C, and solid solution forms interstitial solid solution in Fe, and has significant solution strengthening effect equally, and ys, tensile strength and the hardness of steel are increased, and the plasticity of steel and processability are descended.Along with the reduction of temperature, the solubleness of N in ferritic sharply reduces, and how to separate out at crystal boundary with the AlN form, suppresses the ferrite crystal grain growth, improves ys, tensile strength and the hardness of steel, reduces its plasticity and processability.N also makes steel produce the strain aging phenomenon.Therefore, limit N content and must not be higher than 0.0015%.
The Si solid solution forms substitutional solid solution in Fe, its solution strengthening ability is only second to P, can effectively improve the intensity of steel, but also reduces the plasticity and the toughness of steel simultaneously to a certain extent.Si is more oxidized more easily than iron; Can be in the recrystallization annealing process at surface of steel plate generation selective oxidation reaction; Its oxidation products is prone to be enriched in surface of steel plate; This not only can influence the pot galvanize effect, and the alloying reaction can make pot galvanize the time is sluggish, causes making because of high-temperature alloy the anti-efflorescence ability drop of zinc layer of heat zinc coating plate.Therefore, limit Si content and must not be higher than 0.01%.
Mn in steel with the Fe formation sosoloid that dissolves each other, its solution strengthening ability is lower than P and Si, Mn and solid solution C coexistence can reduce the deep drawing quality of steel.Mn is good sweetening agent, can weaken or eliminate the red brittleness of the steel that causes because of S, improves the hot workability of steel.Mn content is crossed to hang down and not only can be made cost up, also is prone to increase the hot-short tendency of steel.Therefore, Mn content is limited to the 0.10%-0.15% scope.
Compare with other element, P is the strongest element of solution strengthening ferritic ability, and along with the raising of P content, the ys of steel, tensile strength and hardness significantly increase, but plasticity, processability and toughness, especially low-temperature flexibility but obviously descend.P is prone to segregation in steel, the homogeneity of infringement steel plate tissue causes formation of crack.P also can make the alloying reaction in the hot galvanizing process sluggish at grain boundary segregation, thus the same problem that makes the anti-efflorescence ability drop of heat zinc coating plate zinc layer because of high-temperature alloy that produces.Therefore, limit P content and must not be higher than 0.006%.
S is little to the intensity and the plasticity influence of steel.The solubleness of S in ferritic is very low, and many forms with sulfide inclusion exist in steel, and these inclusiones can reduce the plasticity and the toughness of steel, make it produce tangible anisotropy, and cause finished surface and latent defect.S is prone to make steel to produce red brittleness, the hot workability of severe exacerbation steel.S is prone to segregation, and the homogeneity of obvious damage steel plate tissue and quality is to make one of major reason that steel plate cracks.Therefore, limit S content and must not be higher than 0.005%.
Al and O have very strong avidity, generally Al are added in the steel as main reductor during smelting.Al and N also have stronger avidity, can play solid solution N in the fixing steel, eliminate the effect by the strain aging of its generation.But the alloying reaction speed when the too high meeting of Al content reduces pot galvanize in the steel also improves the alloying temperature.Therefore, Al content is limited to the 0.02%-0.03% scope.
Ti is one of very active metallic element, and it all has extremely strong avidity with O, C, N, S, is a kind of good reductor, also is the fixing effective element of solid solution C, N in the steel.The purpose that in the IF steel, adds Ti just is to remove C in the steel, N atom, obtains purified ferrite matrix, and the characteristics of Ti microalloying IF steel are stable performances, and promptly its mechanical property is insensitive to the variation of composition and processing parameter.If but the add-on of Ti is too high, then cause cost to increase and the recrystallization temperature raising.Therefore, limit Ti content and must not be higher than 0.051%.
Cr, Ni, Cu, Mo all can play solution strengthening effect to a certain degree, improve the ys of steel, reduce its plasticity and processability, and Mo can also improve the recrystallization temperature of steel.Therefore, limit Cr content and must not be higher than 0.01%, Ni content must not be higher than 0.01%, and Cu content must not be higher than 0.01%, and Mo content must not be higher than 0.01%.
This interstitial-free 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, RH refining and heavy slab continuous casting, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
0＜C≤0.005 0＜N≤0.004 0＜Si≤0.03 Mn：0.10-0.20
0＜P≤0.018 0＜S≤0.015 Al：0.02-0.06 0＜Ti≤0.070
0＜Cr≤0.05 0＜Ni ≤0.07 0＜Cu≤0.07 0＜Mo≤0.020
All the other are Fe and unavoidable impurities.
B adopts the traditional hot continuous rolling process that continuously cast bloom is processed into hot rolled strip
Continuously cast bloom is heated in walking beam furnace more than 1200 ℃, and soaking time was longer than 2.5 hours, made the austenite homogenizing; 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 3.0-5.0mm, and 880-930 ℃ of hot rolled strip finishing temperature is to realize ausrolling.After the hot rolled strip finish to gauge fast water-cooled batch to 680-750 ℃, to obtain tiny and uniform ferrite crystal grain and thick sparse precipitate; And then in air cool to room temperature.
This interstitial-free hot-rolled steel strip and method of manufacture thereof are the rational Match through chemical ingredients and hot rolling technology system, produce a kind of good plasticity Ti microalloying IF hot rolled strip, have good punching performance as the cold-rolled steel strip of raw material production.Hot rolled strip of the present invention and on June 6th, 2007 the disclosed patent No. be that table 1 is seen in the contrast of hot rolled strip tensile property in " a kind of CSP is produced the production technique of IF steel " patent of invention of CN1974824, see table 2 with the contrast of above-mentioned two kinds of hot rolled strips cold-rolled steel strip punching performance that is raw material production.
Table 1 hot rolled strip of the present invention and the comparison that contrasts the hot rolled strip tensile property
Table 2 is with IF hot rolled strip of the present invention cold-rolled steel strip that is raw material production and the comparison that contrasts the cold-rolled steel strip punching performance
| Unit elongation (%) | Average n value | Average r value | |
| With hot rolled strip of the present invention is the cold-rolled steel strip of raw material production | 45.8-46.4 | 0.24-0.25 | 2.56-2.79 |
| Contrast patent CN1974824 cold-rolled steel strip | 36.5-42 | 0.22-0.23 | 1.48-1.81 |
Can be found out that by table 1 compare with contrast patent CN1974824 hot rolled strip, hot rolled strip intensity of the present invention is lower, plasticity is higher.Can find out by table 2; Unit elongation with the IF hot rolled strip of the present invention cold-rolled steel strip that is raw material production is 45.8%-46.4%; Average n value is 0.24-0.25; Average r value is 2.56-2.79, and apparently higher than the corresponding index of contrast patent CN1974824 cold-rolled steel strip, its plasticity and deep drawability are higher; Can be used as extra-deep drawing level (EDDQ), super extra-deep drawing level (S-EDDQ), senior extra-deep drawing level higher group of drawing steel plates such as (H-EDDQ), can satisfy the request for utilization of industries such as automobile, household electrical appliances manufacturing better.Thereby it is higher to solve existing IF hot rolled strip intensity; Plasticity is lower; With it is that the cold rolling finished product plasticity and the deep drawability of raw material production is not high; Can only be used as commercial grade (CQ), common punch level (DQ), the deep-draw low group of drawing steel plates such as (DDQ) of arbitrarily downgrading, and not meet extra-deep drawing level (EDDQ), super extra-deep drawing level (S-EDDQ), senior extra-deep drawing level higher group of drawing steel plates such as (H-EDDQ) problem the punching press performance requriements.
Embodiment
Specify the embodiment of this interstitial-free hot-rolled steel strip and method of manufacture thereof below in conjunction with embodiment, but the embodiment of this interstitial-free 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, RH a refining unit, heavy slab continuous caster, semi continuous hot rolled strip production line.
Ti microalloying IF hot rolled strip chemical analysis method is GB/T 223, sampling method GB/T 222.
Ti microalloying IF hot rolled strip tensile property method of inspection GB/T 228, sampling method GB/T2975.
Ti microalloying IF hot rolled strip cold-bending property method of inspection GB/T 232, sampling method GB/T2975.
Steel plate embodiment one
The thick 3.0mm of the interstitial-free hot-rolled steel strip of present embodiment, the quality per distribution ratio of chemical ingredients is:
C：0.0015 N：0.0018 Si：0.01 Mn：0.15 P：0.008
S：0.005 Al：0.044 Ti：0.052 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.01, all the other are Fe and unavoidable impurities.
The hot rolled strip of present embodiment is taken a sample according to GB/T 2975 standards, according to GB/T 228 standard testing tensile properties, and test result: lower yield strength ReL:180MPa, tensile strength Rm:295MPa, elongation after fracture A:53%.Above-mentioned IF hot rolled strip is according to the sampling of GB/T 2975 standards, and according to GB/T232 standard testing cold-bending property, 180 ° of d=0 clod washes of test result sample is intact.
Steel plate embodiment two
The thick 4.0mm of the interstitial-free hot-rolled steel strip of present embodiment, the quality per distribution ratio of chemical ingredients is:
C：0.0017 N：0.0016 Si：0.01 Mn：0.16 P：0.008
S：0.005 Al：0.045 Ti：0.055 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.01, all the other are Fe and unavoidable impurities.
The IF hot rolled strip of present embodiment is taken a sample according to GB/T 2975 standards, according to GB/T 228 standard testing tensile properties, and test result: lower yield strength ReL:185MPa, tensile strength Rm:300MPa, elongation after fracture A:52%.Above-mentioned IF hot rolled strip is according to the sampling of GB/T 2975 standards, and according to GB/T232 standard testing cold-bending property, 180 ° of d=0 clod washes of test result sample is intact.
Steel plate embodiment three
The thick 5.0mm of the interstitial-free hot-rolled steel strip of present embodiment, the quality per distribution ratio of chemical ingredients is:
C：0.0013 N：0.0015 Si：0.01 Mn：0.15 P：0.006
S：0.005 Al：0.03 Ti：0.051 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.01, all the other are Fe and unavoidable impurities.
Above-mentioned IF hot rolled strip is taken a sample according to GB/T 2975 standards, according to GB/T 228 standard testing tensile properties, and test result: lower yield strength ReL:220MPa, tensile strength Rm:300MPa, elongation after fracture A:56%.Above-mentioned IF hot rolled strip is according to the sampling of GB/T 2975 standards, and according to GB/T232 standard testing cold-bending property, 180 ° of d=0 clod washes of test result sample is intact.
Method of manufacture embodiment one
The present embodiment manufacturing be steel plate 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, RH refining and heavy slab continuous castings, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.0015 N：0.0018 Si：0.01 Mn：0.15 P：0.008
S：0.005 Al：0.044 Ti：0.052 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.01, all the other are Fe and unavoidable impurities.
B adopts the traditional hot continuous rolling process 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 3.0mm, 910 ℃ of hot rolled strip finishing temperatures.After the hot rolled strip finish to gauge fast water-cooled to 720 ℃ batch, and then in air cool to room temperature.The IF hot rolled strip of present embodiment is taken a sample according to GB/T 2975 standards, according to GB/T 228 standard testing tensile properties, and test result: lower yield strength ReL:180MPa, tensile strength Rm:295MPa, elongation after fracture A:53%.The IF hot rolled strip of present embodiment is really tested cold-bending property according to the sampling of GB/T 2975 standards according to GB/T 232 standards, and 180 ° of d=0 clod washes of test result sample is intact.
Method of manufacture embodiment two
The present embodiment manufacturing be steel plate 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, RH refining and heavy slab continuous castings, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.0017 N：0.0016 Si：0.01 Mn：0.16 P：0.008
S：0.005 Al：0.045 Ti：0.055 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.01, all the other are Fe and unavoidable impurities.
B adopts the traditional hot continuous rolling process 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 4.0mm, 900 ℃ of hot rolled strip finishing temperatures, quick water-cooled to 710 ℃ is batched after the hot rolled strip finish to gauge, and then in air cool to room temperature.The IF hot rolled strip of present embodiment is taken a sample according to GB/T 2975 standards, according to GB/T 228 standard testing tensile properties, and test result: lower yield strength ReL:185MPa, tensile strength Rm:300MPa, elongation after fracture A:52%.The IF hot rolled strip of present embodiment is according to the sampling of GB/T 2975 standards, and according to GB/T 232 standard testing cold-bending properties, 180 ° of d=0 clod washes of test result sample is intact.
Method of manufacture embodiment three
The present embodiment manufacturing be steel plate 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, RH refining and heavy slab continuous castings, the quality per distribution ratio of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.0013 N：0.0015 Si：0.01 Mn：0.15 P：0.006
S：0.005 Al：0.03 Ti：0.051 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.01, all the other are Fe and unavoidable impurities.
B adopts the traditional hot continuous rolling process 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 5.0mm, 900 ℃ of hot rolled strip finishing temperatures, quick water-cooled to 700 ℃ is batched after the hot rolled strip finish to gauge, and then in air cool to room temperature.The IF hot rolled strip of present embodiment is taken a sample according to GB/T 2975 standards, according to GB/T 228 standard testing tensile properties, and test result: lower yield strength ReL:220MPa, tensile strength Rm:300MPa, elongation after fracture A:56%.The IF hot rolled strip of present embodiment is according to the sampling of GB/T 2975 standards, and according to GB/T 232 standard testing cold-bending properties, 180 ° of d=0 clod washes of test result sample is intact.
Claims (2)
1. interstitial-free hot-rolled steel strip, the mass percent of its chemical ingredients is:
0＜C≤0.0013 0＜N≤0.0015 0＜Si≤0.01 Mn：0.10-0.15
0＜P≤0.006 0＜S≤0.005 Al：0.02-0.03 0＜Ti≤0.051
0＜Cr≤0.01 0＜Ni≤0.01 0＜Cu≤0.01 0＜Mo≤0.01
All the other are Fe and unavoidable impurities.
2. interstitial-free hot-rolled steel strip according to claim 1, the mass percent of its chemical ingredients is:
C：0.0013 N：0.0015 Si：0.01 Mn：0.15 P：0.006 S：0.005
Al：0.03 Ti：0.051 Cr：0.01 Ni：0.01 Cu：0.01 Mo：0.01，
All the other are Fe and unavoidable impurities.
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| CN106987777A (en) * | 2017-03-17 | 2017-07-28 | 河钢股份有限公司承德分公司 | A kind of micro- vanadium extra-deep drawing IF steel of titaniferous and its production method |
| CN107497877A (en) * | 2017-06-02 | 2017-12-22 | 首钢总公司 | A kind of method for producing IF steel |
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