CN101649423B - Niobium micro-alloying gap-free hot rolled strip and manufacture method thereof - Google Patents
Niobium micro-alloying gap-free hot rolled strip and manufacture method thereof Download PDFInfo
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Abstract
The invention relates to a niobium micro-alloying gap-free hot rolled strip and a manufacture method thereof. The strip comprises the chemical components by weight percent: more than 0 and no more than 0.005 percent of C, more than 0 and no more than 0.018 percent of P, more than 0 and no more than 0.015 percent of S, more than 0 and no more than 0.004 percent of N, more than 0 and no more than 0.03 percent of Si, 0.01 to 0.20 percent of Mn, 0.02 to 0.06 percent of Al, more than 0 and no more than 0.020 percent of Nb, more than 0 and no more than 0.05 percent of Cr, more than 0 and no more than 0.07 percent of Ni, more than 0 and no more than 0.07 percent of Cu, more than 0 and no more than 0.020 percent of Mo, and the balance of Fe and inevitable impurities. The manufacture method of thestrip comprises the following steps: A. preparing a continuous casting billet: preprocessing and desulfurizing by molten iron, smelting by a top-bottom combined blowing converter, RH refining and continuously casting heavy slabs; and B. adopting the traditional hot continuous rolling process to process the continuous casting billet into the hot rolled strip with the final rolling temperature of 880 DEG C to 930 DEG C, carrying out fast water cooling to 680 DEG C to 750 DEG C, coiling, and then cooling to the room temperature. The strip manufactured by the manufacture method of the niobium micro-alloying gap-free hot rolled strip has low strength, high plasticity and favorable processing technology.
Description
Technical field
The present invention relates to a kind of niobium micro-alloying gap-free hot rolled 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 at present, 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 titanium micro-alloyedization 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 niobium micro-alloying gap-free hot rolled strip, it is lower to the invention provides a kind of intensity, and the niobium micro-alloying gap-free hot rolled 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-microalloying IF hot rolled strip mainly by the rational Match of chemical ingredients and hot rolling technology system.
The mass percent proportioning of this niobium micro-alloying gap-free hot rolled strip chemical ingredients is:
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＜Nb≤0.020
0＜Cr≤0.05 0＜Ni≤0.07 0＜Cu≤0.070＜ Mo≤0.020
All the other are Fe and unavoidable impurities.
General width is 1000～2130mm, thickness 3.0～5.0mm.
This Nb-microalloying gap-free atom steel continuous casting billet at first makes the austenite homogenizing through heating, insulation, be rolled into steel band subsequently, the quick water-cooled of hot rolled strip, batch the back and in air, naturally cool to room temperature, in steel band, formed the tiny and uniform ferrite crystal grain that is of a size of 18～23 μ m and be of a size of the thick sparse precipitate of 0.1～0.2 μ m.The yield strength of this niobium micro-alloying gap-free hot rolled strip is 185MPa～235MPa, and tensile strength is 290MPa～310MPa, and unit elongation is 48%～55.5%.
The qualification of good plasticity Nb-microalloying 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 reduce, 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.
Nb and O, C, N all have very strong avidity, can be respectively and the stable compound of its formation.Add Nb be in the IF steel in order to remove C in the steel, N atom, to obtain purified ferrite matrix, the characteristics of Nb microalloying IF steel are that the mechanical property anisotropy is less, and the anti-efflorescence ability of coating is stronger.If but 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%.
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 niobium micro-alloying gap-free hot rolled 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≤0.005 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＜Nb≤0.0200
＜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 heats in walking beam furnace, and Heating temperature is not less than 1200 ℃, and soaking time is not shorter than 2.5 hours, makes the austenite homogenizing; Continuously cast bloom is through the roughing and the hot-work in two stages of finish rolling, and being rolled into thickness is the finished product hot rolled strip of 3.0～5.0mm, and 880～930 ℃ of hot rolled strip finishing temperatures are to realize ausrolling; After the hot rolled strip finish to gauge fast water-cooled to 680～750 ℃ batch, obtaining tiny and uniform ferrite crystal grain and thick sparse precipitate, and then in air cool to room temperature, generally be not higher than 60 ℃.
This interstitial-free hot-rolled steel strip and manufacture method thereof are the rational Match by chemical ingredients and hot rolling technology system, produce a kind of good plasticity Nb 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 | 185-235 | 290-310 | 48-55.5 |
| The hot rolled strip of contrast patent CN1974824 | 265-285 | 340-365 | 35-43 |
The cold-rolled steel strip that table 2 is a raw material production with IF hot rolled strip of the present invention
Comparison with contrast 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 | 43.8-46.5 | 0.24-0.25 | 2.49-2.80 |
| 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 43.8%-46.5%, average n value is 0.24-0.25, average r value is 2.49-2.80, 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 niobium micro-alloying gap-free hot rolled 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, traditional semi continuous hot rolled strip production line.
Nb-microalloying IF hot rolled strip chemical analysis method is GB/T 223, sampling method GB/T222.
Nb-microalloying IF hot rolled strip tensile property method of inspection GB/T 228, sampling method GB/T2975.
The hot rolled strip cold-bending property method of inspection GB/T 232 of Nb-microalloying, sampling method GB/T2975.
Steel band embodiment one
The thick 3.0mm of the niobium micro-alloying gap-free hot rolled strip of present embodiment, the quality per distribution ratio of chemical ingredients is:
C：0.0015 N：0.0019 Si：0.009 Mn：0.13 P：0.006
S：0.004 Al：0.05 Nb：0.016 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.001, all the other are Fe and unavoidable impurities.
The Nb-microalloying 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:225MPa, tensile strength Rm:310MPa, elongation after fracture A:48.5%.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 band embodiment two
The thick 4.0mm of the niobium micro-alloying gap-free hot rolled strip of present embodiment, the quality per distribution ratio of chemical ingredients is:
C：0.0013 N：0.0018 Si：0.01 Mn：0.145 P：0.007
S：0.0035 Al：0.043 Nb：0.014 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.0023, all the other are Fe and unavoidable impurities.
The Nb-microalloying 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:210MPa, tensile strength Rm:300MPa, elongation after fracture A:51.5%.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.
Steel band 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：0.0012 N：0.0015 Si：0.005 Mn：0.149 P：0.0063
S：0.0045 Al：0.051 Nb：0.0146 Cr：0.015 Ni：0.013
Cu:0.01 Mo:0.0022, all the other are Fe and unavoidable impurities.
The Nb-microalloying 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:290MPa, elongation after fracture A:55.5%.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 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：0.001 5N：0.0019 Si：0.009 Mn：0.13 P：0.006
S：0.004 Al：0.05 Nb：0.016 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.001, 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, 900 ℃ of hot rolled strip finishing temperatures.After the hot rolled strip finish to gauge fast water-cooled to 690 ℃ batch, and then in air, be cooled to 30 ℃.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:225MPa, tensile strength Rm:310MPa, elongation after fracture A:48.5%.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：0.0013 N：0.0018 Si：0.01 Mn：0.145 P：0.007
S：0.0035 Al：0.043 Nb：0.014 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.0023, 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, 905 ℃ of hot rolled strip finishing temperatures, after the hot rolled strip finish to gauge fast water-cooled to 700 ℃ batch, and then in air, be cooled to 35 ℃.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:210MPa, tensile strength Rm:300MPa, elongation after fracture A:51.5%.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 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：0.0012 N：0.0015 Si：0.005 Mn：0.149 P：0.0063
S：0.0045 Al：0.051 Nb：0.0146 Cr：0.015 Ni：0.013
Cu:0.01 Mo:0.0022, 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, 910 ℃ of hot rolled strip finishing temperatures, after the hot rolled strip finish to gauge fast water-cooled to 710 ℃ batch, and then in air, be cooled to 41 ℃.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:185MPa, tensile strength Rm:290MPa, elongation after fracture A:55.5%.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 (3)
1. niobium micro-alloying gap-free hot rolled strip, the quality per distribution ratio of its chemical ingredients is:
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＜Nb≤0.020
0＜Cr≤0.05 0＜Ni≤0.07 0＜Cu≤0.07
0＜Mo≤0.020, all the other are Fe and unavoidable impurities;
Described niobium micro-alloying gap-free hot rolled strip, by molten iron pretreatment desulfurizing, top bottom blowing converter smelting, RH refining and heavy slab continuous casting, the continuously cast bloom that obtains: continuously cast bloom at first makes the austenite homogenizing through heating, insulation, be rolled into steel band subsequently, the quick water-cooled of hot rolled strip, batch the back and in air, naturally cool to room temperature, in steel band, formed the tiny and uniform ferrite crystal grain that is of a size of 18～23 μ m and be of a size of the thick sparse precipitate of 0.1～0.2 μ m;
Yield strength is 185MPa～235MPa, and tensile strength is 290MPa～310MPa, and unit elongation is 48%～55.5%.
2. the manufacture method of the described niobium micro-alloying gap-free hot rolled 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≤0.005 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＜Nb≤0.020
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 is processed into hot rolled strip with continuously cast bloom
Be processed in the process of hot rolled strip at continuously cast bloom, continuously cast bloom Heating temperature in walking beam furnace is not less than 1200 ℃, and soaking time is not less than 2.5 hours, makes the austenite homogenizing; Continuously cast bloom is rolled into the hot rolled strip that thickness is 3.0-5.0mm through the roughing and the hot-work in two stages of finish rolling, 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.
3. the manufacture method of niobium micro-alloying gap-free hot rolled strip according to claim 2 is characterized in that the mass percent of the chemical ingredients of continuously cast bloom is:
C：0.0015 N：0.0019 Si：0.009 Mn：0.13 P：0.006
S：0.004 Al：0.05 Nb：0.016 Cr：0.01 Ni：0.01
Cu:0.01 Mo:0.001, all the other are Fe and unavoidable impurities.
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| CN110760758A (en) * | 2019-12-11 | 2020-02-07 | 马鞍山钢铁股份有限公司 | High-strength IF steel plate with yield strength of 170-300MPa and production method thereof |
| CN114836690A (en) * | 2022-04-28 | 2022-08-02 | 鞍钢股份有限公司 | Gapless atom cold-rolled steel plate with excellent uniform elongation and preparation method thereof |
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| CN101649423A (en) | 2010-02-17 |
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