CN102732794A - Hot-rolled pickled plate for Cr-containing automobile structure and production method thereof - Google Patents
Hot-rolled pickled plate for Cr-containing automobile structure and production method thereof Download PDFInfo
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Abstract
The invention provides a hot-rolled pickled plate for a Cr-containing automobile structure. The plate comprises, in terms of weight percent, 0.11 to 0.15% of C, no more than 0.05% of Si, 0.60 to 1.20% of Mn, 0.20 to 0.40% of Cr, 0.01 to 0.02% of Ti, no more than 0.02% of P, no more than 0.010% of S and 0.02 to 0.07% of Als, with the balance being Fe and unavoidable impurities. According to a production method for the hot-rolled pickled plate provided in the invention, the hot-rolled pickled plate for a Cr-containing automobile structure is produced by controlling the parameters of chemical components in steel and a hot rolling process, a pickling process and the like. The hot-rolled pickled plate in the invention has excellent comprehensive properties like high strength and good stamping performance and has a tensile strength reaching 440 MPa grade; and the production method in the invention has the advantages of small process control difficulty, strong operationality, simpleness, low cost and the like.
Description
Technical field
The present invention relates to a kind of hot rolling acid-cleaning plate and working method thereof, more particularly, relate to a kind of Cr of containing vehicle structure with hot rolling acid-cleaning plate and working method thereof.
Background technology
Hot rolling acid-cleaning plate is to be raw material with the high-quality latten; Remove the sheet material that zone of oxidation, side cut, finishing are processed through the pickling unit; The main manufacturing procedure of hot rolling acid-cleaning plate has laser welding, turbulent pickling, online smooth, side cut, the online wet goods that is coated with; Its surface quality and request for utilization are the desirable substitute products of part hot-rolled sheet and cold-reduced sheet between hot-rolled sheet and cold-reduced sheet.
The advantage of hot rolling acid-cleaning plate is: 1) surface quality is good, because hot rolling acid-cleaning plate has been removed scale on surface, has improved the surface quality of steel, is convenient to welding, oiling and japanning; 2) dimensional precision is high, smooth after, template is changed a lot, thereby reduce the deviation of roughness; 3) improve surface smoothness, strengthened appearance; 4) can reduce the environmental pollution that the user disperses pickling to cause; 5) under the prerequisite that guarantees the surface quality request for utilization, make the user effectively reduce purchase cost.
Publication No. is that the one Chinese patent application of CN102011054A discloses a kind of hot rolling acid-cleaning plate and low titanium strengthened production process thereof; Wherein adopted the SPHC hot rolling acid-cleaning plate of low titanium reinforcing process production to be mainly the waist folding defective (being cross breaks defect) that occurs in the solution production process, then its intensity is on the low side if this hot rolling acid-cleaning plate is used for automobile structure.
Publication No. is the hot rolling acid-cleaning plate technique that the one Chinese patent application of CN102312155A discloses a kind of high-yield-ratio, and its chemical constitution is: C:0.04～0.06%, Si:0.02～0.03%, Mn:0.15～0.35%, P:0.015～0.020%, S:0.07～0.010%, Als:0.030～0.060%.Its objective is to compare with cold-reduced sheet and improve ys simultaneously and tensile strength improves yield tensile ratio, obviously, cold-reduced sheet will pass through high temperature annealing, naturally its intensity level is more much lower than hot rolling acid-cleaning plate, this is one of advantage of acid-cleaning plate.Yet this composition design production difficulty is big, for example; Wherein the content of Si is 0.02～0.03%; Obviously, Si exists as a kind of residual element, general Si≤0.05%; When the Si content in the steel be 0.01%, 0.04%, 0.05% or＜0.01% the time, Si does not have the performance of steel and the influence of quality basically.If remaining Si＜0.02% just needs to add ferrosilicon; When the Si of remnants＞0.03～0.05%, the Si content in the steel just can't reduce again, then can't satisfy processing requirement.So this production technique is not easy to realize in the big production of industry.
For the good steel of impact briquetting, need can not produce stamping defects such as warpage, resilience simultaneously guaranteeing to require ys low on its high-tensile basis; The requirement unit elongation is high, can not produce stamping cracking.Steel grade of the prior art can't satisfy this requirement.
Summary of the invention
To the deficiency that exists in the prior art, what the object of the present invention is to provide a kind of 440MPa level contains the Cr vehicle structure with hot rolling acid-cleaning plate and a kind of simple, working method that cost is low is provided.
To achieve these goals; One side of the present invention provides a kind of Cr of containing vehicle structure to use hot rolling acid-cleaning plate; By weight percentage, said hot rolling acid-cleaning plate contains the Fe and the unavoidable impurities of C:0.11～0.15%, Si≤0.05%, Mn:0.60～1.20%, Cr:0.20～0.40%, Ti:0.01～0.02%, P≤0.02%, S≤0.010%, Als:0.02～0.07% and surplus.
According to an embodiment who contains the Cr vehicle structure with hot rolling acid-cleaning plate of the present invention, the ys of said hot rolling acid-cleaning plate is 300～350MPa.
According to an embodiment who contains the Cr vehicle structure with hot rolling acid-cleaning plate of the present invention, the tensile strength >=440MPa of said hot rolling acid-cleaning plate.
According to an embodiment who contains the Cr vehicle structure with hot rolling acid-cleaning plate of the present invention, the unit elongation of said hot rolling acid-cleaning plate >=38%.
Another aspect of the present invention provides the working method of a kind of Cr of containing vehicle structure with hot rolling acid-cleaning plate; Said working method comprises the steps: to prepare steel billet; Wherein, By weight percentage, said steel billet contains the Fe and the unavoidable impurities of C:0.11～0.15%, Si≤0.05%, Mn:0.60～1.20%, Cr:0.20～0.40%, Ti:0.01～0.02%, P≤0.02%, S≤0.010%, Als:0.02～0.07% and surplus; After steel billet is heated to 1220～1260 ℃, the steel billet roughing is become intermediate blank, the roughing draft is 80～85%, is coil of strip with intermediate blank finish rolling after being incubated again, and the finish rolling draft is 85～95%, and wherein, finishing temperature is 850～900 ℃; Coil of strip batched under 700～750 ℃ of coiling temperatures through laminar flow cooling back obtain to be with steel, wherein, speed of cooling≤20 ℃/s; Carry out pickling after will being with steel to weld end to end, the smooth unit elongation of pickling is 1.0～2.0%; Carry out the oiling bundling at last, obtain finished product.
The present invention obtains a kind of Cr of containing vehicle structure and uses hot rolling acid-cleaning plate through chemical ingredients, hot rolling technology and the acid cleaning process of control in the steel, and the Cr of containing vehicle structure of the present invention has excellent comprehensive performances such as intensity height, punching performance are good with hot rolling acid-cleaning plate; The Cr of containing vehicle structure of the present invention has also with the working method of hot rolling acid-cleaning plate that technique controlling difficulty is little, workable, method simple, low cost and other advantages.
Embodiment
At first, the working method of the Cr of containing vehicle structure of the present invention with hot rolling acid-cleaning plate described in detail.
Obtain the hot rolling acid-cleaning plate of HS high-mouldability ability, at first will guarantee hot rolling raw material plate excellent mechanical property and high intensity, promptly appropriate ys and higher unit elongation.Therefore, the major technology measure has:
(1) reduces inclusion content.The continuity that has the havoc matrix of steel inclusion influences the raising of unit elongation, in conjunction with the deformation extent of unit elongation experimental technique and each type impurity; The main inclusions that influences the unit elongation index is that sulfide inclusion and silicate are mingled with; This class is mingled with and belongs to plasticity and be mingled with, and along the rolling direction extensional, and the tensile testing sample is generally laterally in the operation of rolling; Therefore the inclusion of longitudinal extension distortion will have a strong impact on continuity, cause the cross directional stretch unit elongation to descend.Therefore, control S and the content of Si in the steel.
(2) C, the N interstitial atom in the removing steel.Cr is medium carbide forming element, and in all various carbide, chromium carbide is the most tiny a kind of, and it can be evenly distributed in the steel volume, because it can make structure refinement and all distribute, so plasticity, toughness might as well.
Ti is the good fixing element of N in the steel, adds The addition of C r and trace Ti at vehicle structure in steel, can remove C, N interstitial atom in the steel well, thereby when guaranteeing tensile strength, reduce ys and improve unit elongation.
(3) suitable hot rolling technology.As far as microalloying F+P steel; In specific end cold scope (600 ℃～750 ℃); Unit elongation improves with the raising of final cooling temperature, mainly contains following influence factor: cooling rate is bigger, final cooling temperature is low more, microalloy element separate out more disperse; Volume(tric)fraction is bigger, causes the rimose tendency bigger; Cooling rate is bigger, final cooling temperature is low more, and the perlite volume(tric)fraction increases, and then unit elongation descends.
(4) simultaneously, can also further improve mechanical property through the smooth function of pickling unit.The formation process of steel plate is under the combined action of tension force and rolling load, to realize, can make the initial imperfection of steel plate up, and the pore in the steel plate is made up, the dispersed shrinkage compacting, and the density of material increases, and improves the mechanical property of steel plate; On the other hand, steel plate produces bigger frictional force between surface of steel plate and levelling machine working roll in smooth process, and the shearing strain of surface of steel plate crystal grain is increased, and causes crystal grain tiny, has improved the mechanical property of steel plate.
The present invention at first the chemical ingredients of the steel billet through the adjustment hot rolling acid-cleaning plate to guarantee certain intensity.Wherein, the content of solution strengthening Elements C, Mn can not be too low, to improve plasticity; The C constituent content can not be too high; In order to reduce the content of steel inclusion, the content of P, S can not be too high; In addition, the Ti that adds a certain amount of Cr and trace is C, the N interstitial atom in the steel effectively fixedly, further improves the purity of steel.In addition, the present invention further improves its mechanical property through the machined parameters of adjustment hot rolling acid-cleaning plate.Wherein, hot rolling is adopted high temperature (700～750 ℃) to batch and is beneficial to separating out and alligatoring of the second phase particle, thereby helps the raising of punching performance; The unit elongation of smooth employing 1.0～2.0% after the pickling is with further raising punching performance.
At first, prepare steel billet with certain chemical ingredients.Wherein, By weight percentage, the steel billet among the present invention contains the Fe and the unavoidable impurities of C:0.11～0.15%, Si≤0.05%, Mn:0.60～1.20%, Cr:0.20～0.40%, Ti:0.01～0.02%, P≤0.02%, S≤0.010%, Als:0.02～0.07% and surplus.The beneficial effect of this chemical composition design is when guaranteeing high intensity rank (440MPa level), to improve unit elongation and reduce ys, helps punching performance on the one hand; On the other hand, C, Mn, Cr, Ti, Als all are controlled at certain limit, cross that low then intensity can not guarantee and steel intermediate gap atom fixed effect is bad, and too high then ys can raise, and causes cost to increase.And Si, P, S be controlled in certain content, can improve the purity of steel well, and industrial production is simple, and production cost is low.
Afterwards, steel billet is heated to 1220～1260 ℃ after, through two reversing rougher groups the steel billet roughing is become intermediate blank; The roughing draft is 80～85%, through Coil Box intermediate blank is carried out finish rolling after insulation again, and the finish rolling draft is 85～95%; Wherein, finishing temperature is 850～900 ℃.For obtaining the second thick phase particle and the time should prevent its dissolving in heating, the Heating temperature of steel billet is unsuitable too high.Simultaneously, for the finishing temperature that reduces thin specification acid-cleaning plate rolling load and guarantee thin specification acid-cleaning plate, Heating temperature also should not be too low.Higher finishing temperature then helps obtaining equiaxial ferrite crystal grain, thereby helps punching performance, therefore can not be lower than 850 ℃; But if the too high meeting of temperature causes cooling rate to strengthen, thereby form thinner crystal grain, be unfavorable for punching performance, therefore can not be higher than 900 ℃.
Again coil of strip is got into reeling machine through laminar flow cooling back and batch, speed of cooling≤20 ℃/s wherein, cooling rate is excessive, and the perlite volume(tric)fraction increases, and then stretches rate decline.Under 700～750 ℃ of coiling temperatures, batch and obtain the band steel.The size of coiling temperature directly has influence on form, the size of separating out of the second phase particle and precipitate and distributes, and suitable coiling temperature helps separating out of the second phase particle and alligatoring, thereby helps punching performance, and therefore, coiling temperature is not less than 700 ℃.If too high, can cause separating out inhomogeneous, therefore, can not be higher than 750 ℃.
Carry out pickling after will being with steel to weld end to end then, the smooth unit elongation of pickling is 1.0～2.0%, is lower than 1.0%, does not reach smooth effect, is higher than 2.0%, can cause the cold deformation amount to strengthen, and produces work hardening, can reduce the unit elongation of steel plate; Carry out the oiling bundling at last, the Cr vehicle structure that contains that can obtain tensile strength among the present invention and be the 440MPa level is used the hot rolling acid-cleaning board finished product.
Therefore; By weight percentage, the Cr of containing vehicle structure of the present invention contains the Fe and the unavoidable impurities of C:0.11～0.15%, Si≤0.05%, Mn:0.60～1.20%, Cr:0.20～0.40%, Ti:0.01～0.02%, P≤0.02%, S≤0.010%, Als:0.02～0.07% and surplus with hot rolling acid-cleaning plate.And according to test-results, the ys of hot rolling acid-cleaning plate of the present invention can reach 300～350MPa, tensile strength >=440MPa, unit elongation >=38%.
Through concrete embodiment the Cr of containing vehicle structure of the present invention is described with hot rolling acid-cleaning plate and working method below.Wherein, the measuring method of the ys in the instance of the present invention, tensile strength, unit elongation is all measured by national standard.
Embodiment one
By weight percentage, the chemical ingredients of steel billet is: C:0.11%, Si:0.05%, Mn:0.60%, Cr:0.20%, Ti:0.010%, P:0.011%, S:0.010%, Als:0.022%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches → and welds end to end → pickling → smooth → oiling → finished product.Steel billet becomes the thick intermediate blank of 35mm through two reversing rougher 6 passage roughing after 1220 ℃ of heating, the roughing draft is 82.5%; After the Coil Box insulation, get into finishing train again; Be rolled into the thick coil of strip of 1.8mm, the finish rolling draft is 94.9%, and finishing temperature is 850 ℃.Coil of strip gets into reeling machine and batches to such an extent that be with steel after the laminar flow cooling, speed of cooling is 19.5 ℃/s, and the temperature of batching in the step is 702 ℃.To be with steel through carrying out pickling after the welding end to end, the smooth unit elongation of pickling is 1.0%.Last oiling bundling, obtaining specification is that the thick Cr vehicle structure that contains of 1.8mm is used hot rolling acid-cleaning plate.
Through measuring, present embodiment is produced, and to contain the Cr vehicle structure following with the performance of hot rolling acid-cleaning plate: ys, tensile strength, unit elongation are respectively 305MPa, 445MPa, 39%.
Embodiment two
By weight percentage, the chemical ingredients of steel billet is: C:0.13%, Si:0.04%, Mn:0.75%, Cr:0.30%, Ti:0.015%, P:0.010%, and S:0.007%, Als:0.029%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches → and welds end to end → pickling → smooth → oiling → finished product.Steel billet becomes the thick intermediate blank of 38mm through two reversing rougher 6 passage roughing after 1230 ℃ of heating, the roughing draft is 81%; After the Coil Box insulation, get into finishing train again; Be rolled into the thick coil of strip of 2.5mm, the finish rolling draft is 93.4%, and finishing temperature is 870 ℃.Coil of strip gets into reeling machine and batches to such an extent that be with steel after the laminar flow cooling, speed of cooling is 18.4 ℃/s, and the temperature of batching in the step is 715 ℃.To be with steel through carrying out pickling after the welding end to end, the smooth unit elongation of pickling is 1.4%.Last oiling bundling, obtaining specification is that the thick Cr vehicle structure that contains of 2.5mm is used hot rolling acid-cleaning plate.
Through measuring, present embodiment is produced, and to contain the Cr vehicle structure following with the performance of hot rolling acid-cleaning plate: ys, tensile strength, unit elongation are respectively 310MPa, 465MPa, 41%.
Embodiment three
By weight percentage, the chemical ingredients of steel billet is: C:0.14%, Si:0.03%, Mn:1.10%, Cr:0.34%, Ti:0.02%, P:0.014%, S:0.007%, Als:0.043%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches → and welds end to end → pickling → smooth → oiling → finished product.Steel billet becomes the thick intermediate blank of 37mm through two reversing rougher 6 passage roughing after 1250 ℃ of heating, the roughing draft is 81.5%; After the Coil Box insulation, get into finishing train again; Be rolled into the thick coil of strip of 4.0mm, the finish rolling draft is 89.2%, and finishing temperature is 880 ℃.Coil of strip gets into reeling machine and batches to such an extent that be with steel after the laminar flow cooling, speed of cooling is 17.7 ℃/s, and the temperature of batching in the step is 740 ℃.To be with steel through carrying out pickling after the welding end to end, the smooth unit elongation of pickling is 1.8%.Last oiling bundling, obtaining specification is that the thick Cr vehicle structure that contains of 4.0mm is used hot rolling acid-cleaning plate.
Through measuring, present embodiment is produced, and to contain the Cr vehicle structure following with the performance of hot rolling acid-cleaning plate: ys, tensile strength, unit elongation are respectively 340MPa, 485MPa, 42%.
Embodiment four
By weight percentage, the chemical ingredients of steel billet is: C:0.15%, Si:0.05%, Mn:1.20%, Cr:0.40%, Ti:0.014%, P:0.015%, S:0.010%, Als:0.065%, all the other are Fe and unavoidable impurities.
Its production process is: steel billet → hot rolling → laminar flow cools off → batches → and welds end to end → pickling → smooth → oiling → finished product.Steel billet becomes the thick intermediate blank of 38mm through two reversing rougher 6 passage roughing after 1220 ℃ of heating, the roughing draft is 81%; After the Coil Box insulation, get into finishing train again; Be rolled into the thick coil of strip of 5.0mm, the finish rolling draft is 86.8%, and finishing temperature is 900 ℃.Coil of strip gets into reeling machine and batches to such an extent that be with steel after the laminar flow cooling, speed of cooling is 16.5 ℃/s, and the temperature of batching in the step is 750 ℃.To be with steel through carrying out pickling after the welding end to end, the smooth unit elongation of pickling is 2.0%.Last oiling bundling, obtaining specification is that the thick Cr vehicle structure that contains of 5.0mm is used hot rolling acid-cleaning plate.
Through measuring, present embodiment is produced, and to contain the Cr vehicle structure following with the performance of hot rolling acid-cleaning plate: ys, tensile strength, unit elongation are respectively 345MPa, 475MPa, 43%.
In sum; The present invention is through chemical ingredients, hot rolling technology and acid cleaning process in the control steel; The Cr vehicle structure that contains that obtains a kind of tensile strength and be the 440MPa level is used hot rolling acid-cleaning plate, and the Cr of containing vehicle structure of the present invention has excellent comprehensive performances such as intensity height, punching performance be good with hot rolling acid-cleaning plate; The Cr of containing vehicle structure of the present invention has also with the working method of hot rolling acid-cleaning plate that technique controlling difficulty is little, workable, method simple, low cost and other advantages, has good promotion prospect.
Although specifically described the Cr of containing vehicle structure of the present invention with hot rolling acid-cleaning plate and working method thereof, those skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can make various forms of changes to the present invention.
Claims (5)
1. one kind contains the Cr vehicle structure and uses hot rolling acid-cleaning plate; It is characterized in that; By weight percentage, said hot rolling acid-cleaning plate contains the Fe and the unavoidable impurities of C:0.11～0.15%, Si≤0.05%, Mn:0.60～1.20%, Cr:0.20～0.40%, Ti:0.01～0.02%, P≤0.02%, S≤0.010%, Als:0.02～0.07% and surplus.
2. the Cr of containing vehicle structure according to claim 1 is used hot rolling acid-cleaning plate, it is characterized in that, the ys of said hot rolling acid-cleaning plate is 300～350MPa.
3. the Cr of containing vehicle structure according to claim 1 is used hot rolling acid-cleaning plate, it is characterized in that the tensile strength >=440MPa of said hot rolling acid-cleaning plate.
4. the Cr of containing vehicle structure according to claim 1 is used hot rolling acid-cleaning plate, it is characterized in that the unit elongation of said hot rolling acid-cleaning plate >=38%.
5. a working method that contains the Cr vehicle structure with hot rolling acid-cleaning plate is characterized in that said working method comprises the steps:
The preparation steel billet; Wherein, By weight percentage, said steel billet contains the Fe and the unavoidable impurities of C:0.11～0.15%, Si≤0.05%, Mn:0.60～1.20%, Cr:0.20～0.40%, Ti:0.01～0.02%, P≤0.02%, S≤0.010%, Als:0.02～0.07% and surplus;
After steel billet is heated to 1220～1260 ℃, the steel billet roughing is become intermediate blank, the roughing draft is 80～85%, is coil of strip with intermediate blank finish rolling after being incubated again, and the finish rolling draft is 85～95%, and wherein, finishing temperature is 850～900 ℃;
Coil of strip batched under 700～750 ℃ of coiling temperatures through laminar flow cooling back obtain to be with steel, wherein, speed of cooling≤20 ℃/s;
Carry out pickling after will being with steel to weld end to end, the smooth unit elongation of pickling is 1.0～2.0%;
Carry out the oiling bundling at last, obtain finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210175585.1A CN102732794B (en) | 2012-05-31 | 2012-05-31 | Hot-rolled pickled plate for Cr-containing automobile structure and production method thereof |
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| CN201210175585.1A CN102732794B (en) | 2012-05-31 | 2012-05-31 | Hot-rolled pickled plate for Cr-containing automobile structure and production method thereof |
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| CN102732794A true CN102732794A (en) | 2012-10-17 |
| CN102732794B CN102732794B (en) | 2014-08-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104878302A (en) * | 2015-05-20 | 2015-09-02 | 本钢板材股份有限公司 | Method for producing hot-rolling acid-pickling plate for hot-pressing molding |
| CN105441802A (en) * | 2015-12-01 | 2016-03-30 | 攀钢集团西昌钢钒有限公司 | Titanium-containing acid pickling plate and preparation method thereof |
| CN107952815A (en) * | 2017-11-16 | 2018-04-24 | 北京首钢股份有限公司 | A kind of production method of hot rolling acid-cleaning plate |
| CN108441759A (en) * | 2018-02-13 | 2018-08-24 | 鞍钢股份有限公司 | A kind of 540MPa grades of hot rolling acid-cleaning steel plate and its manufacturing method |
| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
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| CN1648277A (en) * | 2004-01-29 | 2005-08-03 | 杰富意钢铁株式会社 | High strength steel sheet and method for manufacturing same |
| CN102409223A (en) * | 2011-12-29 | 2012-04-11 | 河北省首钢迁安钢铁有限责任公司 | Hot-rolled pickled sheet with low yield ratio and production method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1648277A (en) * | 2004-01-29 | 2005-08-03 | 杰富意钢铁株式会社 | High strength steel sheet and method for manufacturing same |
| CN102409223A (en) * | 2011-12-29 | 2012-04-11 | 河北省首钢迁安钢铁有限责任公司 | Hot-rolled pickled sheet with low yield ratio and production method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104878302A (en) * | 2015-05-20 | 2015-09-02 | 本钢板材股份有限公司 | Method for producing hot-rolling acid-pickling plate for hot-pressing molding |
| CN105441802A (en) * | 2015-12-01 | 2016-03-30 | 攀钢集团西昌钢钒有限公司 | Titanium-containing acid pickling plate and preparation method thereof |
| CN107952815A (en) * | 2017-11-16 | 2018-04-24 | 北京首钢股份有限公司 | A kind of production method of hot rolling acid-cleaning plate |
| CN108441759A (en) * | 2018-02-13 | 2018-08-24 | 鞍钢股份有限公司 | A kind of 540MPa grades of hot rolling acid-cleaning steel plate and its manufacturing method |
| CN111266406A (en) * | 2020-03-02 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
| CN111266406B (en) * | 2020-03-02 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
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| CN102732794B (en) | 2014-08-06 |
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