CN101608285B - Interstitial free (IF) hot rolled strip and manufacturing method thereof - Google Patents
Interstitial free (IF) hot rolled strip and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides an interstitial free hot rolled strip and a manufacturing method thereof. The mass percents of the chemical constituents of the strip are as follows: 0<C<=0.005, 0<P<=0.018, 0<S<=0.015, 0<N<=0.004, 0<Si<=0.03, Mn 0. 10-0.20, Al 0.02-0.06, 0<Ti<=0.070, 0<Nb<=0.020, 0<Cr<=0.05, 0<Ni<=0.07, 0<Cu<=0.07, 0<Mo<=0.020 and the balance of Fe and other inevitable impurities. The manufacturing method comprises the steps of preparing continuous castings according to the constituent requirement and processing the continuous castings into the hot rolled strip. The manufacturing method of the strip comprises the following steps: A. preparing continuous castings to be desulfurized by liquid iron pretreatment, smelted in a top-bottom combined blowing converter, RH refined and continuously cast by heavy slabs; B. adopting the traditional hot continuous rolling process to process the continuous castings into the hot rolled strip; the finishing temperature is 880-930 DEG C; the hotrolled strip is quickly water-cooled to the temperature of 680-750 DEG C to be reeled up and then is cooled to the room temperature. The strip manufactured by the method has low strength, high plasticity and good processing technic.
Description
Technical field
The present invention relates to a kind of interstitial-free hot-rolled steel strip and manufacture method 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 still based on steel plate 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 steel plate, boot-lid panel, door skin, front and back fender, roof panels, underbody and dashboard etc. are most as 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 with steel, with carbon aluminium-killed steel is that the s-generation punching press of representative with steel developed into Ultra-low carbon, nitrogen IF steel by the first-generation punching press that is representative with the low-carbon (LC) rimming steel with steel plate is the third generation punching press steel of representative.
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 genetic on the cold-rolled steel strip, hot rolled strip is 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, cold-rolled steel strip plasticity is descended, will cause the cold-rolled products stamping cracking to produce waste product 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 yield strength of IF hot rolled strip is 265-285MPa, tensile strength is 340-365MPa, unit elongation is 35%-43%, the intensity of this hot rolled strip is higher, plasticity is lower, unit elongation as the cold rolling finished product of raw material production is 36.5%-42%, 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 plate such as (DDQ) of arbitrarily downgrading, and do 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) is 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 manufacture method 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 manufacture method of this steel band simultaneously.
In order to achieve the above object, and solve hot rolled strip tissue odds, the bad not high problem of finished product cold-rolled steel strip deep drawability that causes of plasticity, the present invention produces a kind of good plasticity Nb, Ti combined microalloying IF hot rolled strip mainly by the rational Match of chemical ingredients and hot rolling technology system.
The mass percent proportioning of the chemical ingredients that this interstitial-free hot-rolled steel strip reaches is:
0＜C≤0.0016 0＜P≤0.007 0＜S≤0.005 0＜N≤0.0020
0＜Si≤0.01 Mn：0.10～0.14 Al：0.02～0.04 0＜Ti≤0.05，
0＜Nb≤0.015 0＜Cr≤0.02 0＜Ni≤0.02 0＜Cu≤0.01
0＜Mo≤0.002, all the other are Fe and unavoidable impurities.
General width is 1000～2130mm, thickness 3.0-5.0mm.
The qualification of good plasticity IF hot rolled strip chemical ingredients of the present invention be 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 yield strength 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 0.005%.
N is the same with C, and solid solution forms interstitial solid solution in Fe, and has significant solution strengthening effect equally, and yield strength, 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 ferrite sharply reduces, and how to separate out at crystal boundary with the AlN form, suppresses the ferrite crystal grain growth, improves yield strength, 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 0.004%.
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 easier to be more oxidized than iron, can be in the recrystallization annealing process at surface of steel plate generation selective oxidation reaction, its oxidation products easily is enriched in surface of steel plate, this not only can influence the pot galvanize effect, and the alloying reaction sluggishness can make pot galvanize the time, cause making the anti-efflorescence ability drop of zinc layer of heat zinc coating plate because of high-temperature alloy.Therefore, limit Si content and must not be higher than 0.03%.
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 easily increases the hot-short tendency of steel.Therefore, Mn content is limited to the 0.10%-0.20% scope.
Compare with other element, P is the strongest element of solution strengthening ferrite ability, and along with the raising of P content, the yield strength of steel, tensile strength and hardness significantly increase, but plasticity, processability and toughness, especially low-temperature flexibility but obviously descend.P is easily segregation in steel, and the homogeneity of infringement steel plate tissue causes formation of crack.P also can make the alloying reaction sluggishness in the hot galvanizing process 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 0.018%.
S is little to the intensity and the plasticity influence of steel.The solubleness of S in ferrite 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 easily makes steel produce red brittleness, the hot workability of severe exacerbation steel.The easy segregation of S, 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 0.015%.
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%-0.06% scope.
Ti is one of very active metallic element, and it and O, C, N, S all have extremely strong avidity, are a kind of good reductors, also is the fixing effective element of solid solution C, N in the steel.The purpose that adds Ti in the IF steel just is to remove C in the steel, N atom, obtains purified ferrite matrix, if but the add-on of Ti is too high, and then cause cost to increase and the recrystallization temperature raising.Therefore, limit Ti content and must not be higher than 0.07%.
Nb and O, C, N all have very strong avidity, can be respectively and the stable compound of its formation.Similar with the effect of Ti, adding Nb in the IF steel is in order to remove C in the steel, N atom, to obtain purified ferrite matrix, if still the add-on of Nb is too high, also can cause cost to increase and the recrystallization temperature raising.Therefore, limit Nb content and must not be higher than 0.02%.
Insensitive to processing parameter, the whole volume performance inconsistency of the mechanical property of Nb, Ti combined microalloying IF steel is little, in-plane anisotropy is little, coating has good anti-efflorescence ability, be suitable for adopting the high temperature continuous annealing process cold-reduced sheet that manufactures a finished product, also be suitable for use as pot galvanize and electro-galvanizing substrate.
Cr, Ni, Cu, Mo all can play solution strengthening effect to a certain degree, improve the yield strength 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 0.05%, Ni content must not be higher than 0.07%, and Cu content must not be higher than 0.07%, and Mo content must not be higher than 0.02%.
This interstitial-free hot-rolled steel strip and manufacture method thereof comprise following sequential steps:
A prepares continuously cast bloom
By molten iron pretreatment desulfurizing, top bottom blowing converter smelting, RH refining and heavy slab continuous casting, the mass percent of the chemical ingredients of the continuously cast bloom of acquisition is:
0＜C≤0.0016 0＜P≤0.007 0＜S≤0.005 0＜N≤0.0020
0＜Si≤0.01 Mn：0.10～0.14 Al：0.02～0.04 0＜Ti≤0.05，
0＜Nb≤0.015 0＜Cr≤0.02 0＜Ni≤0.02 0＜Cu≤0.01
0＜Mo≤0.002,, 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 ℃, obtaining 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 manufacture method thereof, be rational Match by chemical ingredients and hot rolling technology system, produce a kind of good plasticity Nb, Ti combined 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 the contrast of hot rolled strip tensile property sees Table 1 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
| ? | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) |
| Hot rolled strip of the present invention | 190-305? | 290-355? | 45-56.5? |
| The hot rolled strip of contrast patent CN1974824 | 265-285? | 340-365? | 35-43? |
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 | 45.3-46? | 0.24-0.25? | 2.48-2.77? |
| Contrast patent CN1974824 cold-rolled steel strip | 36.5-42? | 0.22-0.23? | 1.48-1.81? |
As can be seen from Table 1, compare with contrast patent CN1974824 hot rolled strip, hot rolled strip intensity of the present invention is lower, and plasticity is higher.As can be seen from Table 2, unit elongation with the IF hot rolled strip of the present invention cold-rolled steel strip that is raw material production is 45.3%-46%, average n value is 0.24-0.25, average r value is 2.48-2.77, corresponding index apparently higher than 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 service requirements 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
Describe the embodiment of this interstitial-free hot-rolled steel strip and manufacture method thereof in detail below in conjunction with embodiment, but the embodiment of this interstitial-free hot-rolled steel strip and manufacture method thereof is not limited to following embodiment.
The working condition of following each 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.
Nb, Ti combined microalloying IF hot rolled strip chemical analysis method are GB/T 223, sampling method GB/T 222.
Nb, Ti combined microalloying IF hot rolled strip tensile property method of inspection GB/T 228, sampling method GB/T 2975.
The hot rolled strip cold-bending property method of inspection GB/T 232 of Nb, Ti combined microalloying, sampling method GB/T 2975.
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：0.0016 N：0.0020 Si：0.01 Mn：0.14 P：0.007
S：0.005 Al：0.04 Ti：0.05 Nb：0.015 Cr：0.02
Ni:0.02 Cu:0.01 Mo:0.002, 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:245MPa, tensile strength Rm:320MPa, elongation after fracture A:48%.The 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.
Steel plate embodiment two
The quality per distribution ratio of the thick 4.0mm chemical ingredients of the interstitial-free hot-rolled steel strip of present embodiment is:
C：0.0015 N：0.0018 Si：0.01 Mn：0.141 P：0.007
S：0.005 AL：0.04 Ti：0.05 Nb：0.014 Cr：0.02
Ni:0.02 Cu:0.01 Mo:0.0043, 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:260MPa, tensile strength Rm:315MPa, elongation after fracture A:50%.Above-mentioned IF hot rolled strip 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.
Steel plate embodiment three
The quality per distribution ratio of the thick 5.0mm chemical ingredients of the interstitial-free hot-rolled steel strip of present embodiment is:
C：0.0014 N：0.0015 Si：0.006 Mn：0.147 P：0.0061
S：0.005 AL：0.0383 Ti：0.056 Nb：0.0146； Cr：0.0163；
Ni:0.0137 Cu:0.0055 Mo:0.0024, 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:215MPa, tensile strength Rm:295MPa, 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/T 232 standard testing cold-bending properties, 180 ° of d=0 clod washes of test result sample is intact.
Manufacture method embodiment one
The present embodiment manufacturing be steel plate embodiment one, the manufacture method of present embodiment comprises following sequential steps:
A prepares continuously cast bloom:
By 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：0.0016 N：0.0020 Si：0.01 Mn：0.14 P：0.007
S：0.005 Al：0.04 Ti：0.05 Nb：0.015 Cr：0.02
Ni:0.02 Cu:0.01 Mo:0.002, 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:245MPa, tensile strength Rm:320MPa, elongation after fracture A:48%.The 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.
Manufacture method embodiment two
The present embodiment manufacturing be steel plate embodiment two, the manufacture method of present embodiment comprises following sequential steps:
A prepares continuously cast bloom:
By molten iron pretreatment desulfurizing, 180 tons of top bottom blowing converter smeltings, RH refining and heavy slab continuous castings, the mass percent proportioning of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.0015 N：0.0018 Si：0.01 Mn：0.141 P：0.007
S：0.005 AL：0.04 Ti：0.05 Nb：0.014 Cr：0.02
Ni:0.02 Cu:0.01 Mo:0.0043, 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, after the hot rolled strip finish to gauge fast water-cooled to 710 ℃ 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:260MPa, tensile strength Rm:315MPa, elongation after fracture A:50%.Above-mentioned IF hot rolled strip is according to the sampling of GB/T2975 standard, and according to GB/T 232 standard testing cold-bending properties, 180 ° of d=0 clod washes of test result sample is intact.
Manufacture method embodiment three
The present embodiment manufacturing be steel plate embodiment three, the manufacture method of present embodiment comprises following sequential steps:
A prepares continuously cast bloom:
By molten iron pretreatment desulfurizing, 180 tons of top bottom blowing converter smeltings, RH refining and heavy slab continuous castings, the mass percent of the chemical ingredients of the continuously cast bloom of acquisition is:
C：0.0014 N：0.0015 Si：0.006 Mn：0.147 P：0.0061
S：0.005 AL：0.0383 Ti：0.056 Nb：0.0146；?Cr：0.0163；
Ni:0.0137 Cu:0.0055 Mo:0.0024, 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, after the hot rolled strip finish to gauge fast water-cooled to 700 ℃ batch, and then in air cool to room temperature.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:215MPa, tensile strength Rm:295MPa, elongation after fracture A:52%.Above-mentioned IF hot rolled strip is according to the sampling of GB/T2975 standard, and according to GB/T 232 standard testing cold-bending properties, 180 ° of d=0 clod washes of test result sample is intact.
Claims (4)
1. interstitial-free hot-rolled steel strip, the quality per distribution ratio of its chemical ingredients is:
0＜C≤0.0016 0＜P≤0.007 0＜S≤0.005 0＜N≤0.0020
0＜Si≤0.01 Mn：0.10～0.14 A1：0.02～0.04 0＜Ti≤0.05
0＜Nb≤0.015 0＜Cr≤0.02 0＜Ni≤0.02 0＜Cu≤0.01
0＜Mo≤0.002, all the other are Fe and unavoidable impurities.
2. the manufacture method of the described interstitial-free hot-rolled steel strip of claim 1, it comprises following sequential steps:
A prepares continuously cast bloom
By molten iron pretreatment desulfurizing, top bottom blowing converter smelting, RH refining and heavy slab continuous casting, the mass percent of the chemical ingredients of the continuously cast bloom of acquisition is:
0＜C≤0.0016 0＜P≤0.007 0＜S≤0.005 0＜N≤0.0020
0＜Si≤0.01 Mn：0.10～0.14 Al：0.02～0.04 0＜Ti≤0.05
0＜Nb≤0.015 0＜Cr≤0.02 0＜Ni≤0.02 0＜Cu≤0.01
0＜Mo≤0.002, 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.
3. according to the manufacture method of the described interstitial-free hot-rolled steel strip of claim 2, it is characterized in that: adopting the traditional hot continuous rolling process continuously cast bloom to be processed in the process of hot rolled strip, continuously cast bloom is heated in walking beam furnace more than 1200 ℃, 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 ℃, obtaining tiny and uniform ferrite crystal grain and thick sparse precipitate, and then in air cool to room temperature.
4. according to the manufacture method of claim 2 or 3 described interstitial-free hot-rolled steel strips, it is characterized in that: the mass percent of the chemical ingredients of continuously cast bloom is:
C：0.0016 N：0.0020 Si：0.01 Mn：0.14 P：0.007
S：0.005 Al：0.04 Ti：0.05 Nb：0.015 Cr：0.02
Ni:0.02 Cu:0.01 Mo:0.002, all the other are Fe and unavoidable impurities.
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| CN101096736A (en) * | 2006-06-27 | 2008-01-02 | 鞍钢股份有限公司 | Clean steel and manufacturing method |
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| 张鹏等.微合金化超深冲-无间隙原子(IF)钢生产技术的进展.《特殊钢》.2005,(第02期),1-5. * |
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