CN101935802A - Method for producing 490MPa level acid-washing-free hot rolled steel plate - Google Patents
Method for producing 490MPa level acid-washing-free hot rolled steel plate Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a method for producing a 490MPa level acid-washing-free hot rolled steel plate. The method comprises the following steps of: heating a continuous casting billet; hot rolling; cooling; reeling, and the like, wherein the billet comprises the following chemical compositions in percentage by weight: 0.04-0.11 percent of C, 0.13-0.27 percent of Si, 0.9-1.30 percent of Mn, 0.001-0.007 percent of N, 0-0.027 percent of P, 0-0.017 percent of S, 0.01-0.09 percent of Al, 0.013-0.027 percent of Nb, 0.004-0.012 percent of Ti and the balance of Fe; the heating temperature of the billet is 1,200-1,240 DEG C, the initial rolling temperature of the hot rolling is 1,120-1,220 DEG C, and the finish rolling temperature is 870-910 DEG C; front-section laminar flow water-cooling after rolling is used by the cooling step; and the temperature of the reeling step is 550-585 DEG C. In the invention, the yield strength of a finished steel band product obtained by the method is larger than or equal to 380MPa, the tensile strength is larger than or equal to 490 MPa, the elongation is larger than or equal to 17 percent, the cold bending property is good, and the proportion of Fe3O4 in an oxidized iron sheet on the surface of the finished product exceeds 80 percent.
Description
Technical field
The invention belongs to metallurgical technology field, particularly the 490MPa level is exempted from the production method of pickling hot-rolled steel sheet.
Background technology
Growing along with national economy, automobile industry has become the mainstay industry of China, the consumption of hot-rolled steel plates for automobiles increases year by year, according to Hyundai Motor " energy-saving and emission-reduction, environmental protection, safety etc. " demand, car manufactures has proposed to develop the requirement that can exempt from pickling or be easy to the steel products of pickling to automobile component with the steel aspect.The iron scale form that this hot-strip product surface produces is Fe
3O
4+ Fe, rather than Fe
3O
4+ FeO type, even need to generate multilayer Fe
3O
4Oxide compound.Because Fe
3O
4(therefore HV350～HV500), plasticity and good adhesion preferably can not peel and break in deep-processing process subsequently because of crooked the generation, and the simultaneous oxidation iron sheet can play the lubrication between instrument and workpiece to have the hardness of reduction.Like this, can simplify even fully phase out the acid cleaning process after the hot rolling, help to improve the sticking power of plating enamelled coating simultaneously.
At present, domestic have the people based on the control of the atmosphere in the iron scale forming process, developed the rust-preventive agent that is sprayed at the hot rolled strip surface, makes in this way to promote Fe
3O
4Generation, but need to increase cooling apparatus, therefore need bigger investment, simultaneously, this method can not produce Fe
3O
4The iron scale tissue that+Fe is easily deformable.The technology that states such as Japan, Korea S, Australia adopt is the type and the thickness of controlled oxidation iron sheet in hot rolling is produced, only need be to course of hot rolling, and particularly rolling the postcooling process carries out careful control, and does not need to increase new equipment.States such as Japan, Korea S and Australia have all carried out a large amount of work in this regard.NKK, the Nippon Steel of Japan and Kawasaki Steel etc. maintain the leading position at exploitation hot-rolled black-skin steel technical elements.The exploitation that the pickling steel is exempted from China's iron and steel bound pair hot rolling still is in the exploratory stage at present, and hot-rolled sheet users such as automobile production producer are to this existing intensive requirement.Therefore, the exploitation easy pickling of hot rolling or exempt from the pickling steel and become an important techniques R﹠D work.
For the cargo truck material, hot-rolled steel sheet for automobile is one of material that specification of quality is the highest in the automobile structure, steel require to possess good obdurability, processability, anti-pitting, enough structural rigidity and welding property, with impact briquetting, welding process requirement and the loading process opposing local deformaton of satisfying the automobile beam, at utmost absorb impact energy, guarantee vehicle body safety.For producing high tensile hot rolled steel sheet, interpolation or compound interpolation V, microalloy elements such as Ti, Nb are the effective ways that improves intensity separately, have been widely used in the industrial production of high-strength hot-rolled structural steel at present.In recent years, in order to adapt to the demand of vehicle lightness, the part automobile manufacturing enterprise has proposed low-cost, as to exempt from pickled surface quality service requirements when purchasing 490MPa level vehicle structure with hot-rolled steel sheet, 490MPa level hot rolled steel plate mechanical property and processing performance require to see Table 1.
Table 1
490MPa level vehicle structure adopts low C-Mn-V microalloying usually or carries out micro-Nb Alloying Treatment scheme with the hot-rolled steel sheet chemical composition design.Typical low C-Mn-V microalloy hot-rolled structural steel chemical ingredients: 0.07%C, 0.25%Si, 0.90%Mn, 0.020%P, 0.018%S, 0.04%Al, 0.07%V, all the other are Fe.Typical micro-Nb alloying hot-rolled structural steel chemical ingredients: 0.08%C, 0.25%Si, 1.20%Mn, 0.018%P, 0.015%S, 0.04%Al, 0.035%Nb, all the other are Fe.Low C-Mn-V microalloying or carry out micro-Nb alloying steel and all adopt the controlled rolling and controlled cooling mode to produce, its technical characterstic is the effect of having considered alloying element solid solution strength and precipitation strength morely, but the higher shortcoming of smelting cost after existing steel band because of the interpolation alloying element has influenced promoting the use of of aforesaid method.
Summary of the invention
Technical problem to be solved by this invention provides a kind of 490MPa level and exempts from the production method of pickling hot-rolled steel sheet, and this method specifically comprises continuously cast bloom heating, hot rolling, step such as cools off, batches.Wherein, the chemical ingredients of steel billet is (wt%): C:0.04～0.11, Si:0.13～0.27, Mn:0.9～1.30, N:0.001～0.007, P:0～0.027, S:0～0.017, Al:0.01～0.09, Nb:0.013～0.027, Ti:0.004～0.012, Fe: surplus.Billet heating temperature is 1200～1240 ℃; The open rolling of hot rolling breaking down temperature is 1120～1220 ℃, and finishing temperature is 870～910 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 550～585 ℃ of step temperature.
Steel billet heat-up time is 1.1～1.9 hours.
Steel billet can adopt the method for well known to a person skilled in the art to be made through converter smelting, LF refining, electrically heated, continuous casting working procedure by blast-melted.
Further, the chemical ingredients of steel billet is C:0.05～0.10, Si:0.15～0.25, Mn:1.0～1.20, N:0.002～0.006, P:0～0.025, S:0～0.015, Al:0.02～0.08, Nb:0.015～0.025, Ti:0.005～0.010, Fe: surplus.Billet heating temperature is 1210～1230 ℃; The open rolling of hot rolling breaking down temperature is 1130～1200 ℃, and finishing temperature is 880～900 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 560～580 ℃ of step temperature.
Steel billet heat-up time is 1.2～1.8 hours.
490MPa level vehicle structure of the present invention comprises ferrite and perlite with the hot-rolled steel sheet heterogeneous microstructure, is benchmark with the cumulative volume of crystalline structure, and ferritic percent by volume is 88～90%, and pearlitic percent by volume is 10～12%.Ferrite and pearlitic percent by volume can adopt the method for well known to a person skilled in the art to record, for example GB/T 6394 metallographic methods.
The invention has the beneficial effects as follows:
1, the inventive method adopts technological measures such as control chemical ingredients scope, hot rolling Heating temperature, finishing temperature, coiling temperature in production process, the steel band finished product yield strength 〉=380MPa that obtains, tensile strength 〉=490MPa, unit elongation 〉=17%, cold-bending property is good.
2, adopt the low equivalent scheme during chemical composition design, the steel plate welding property is good.
3, external refining process adopts the Si-Ca line to carry out the sulfide denaturing treatment, sulfide exists with ribbon or corynebacterium usually at steel grade, the acid resistance that is unfavorable for steel, thereby when handling, external refining adopts the sulfide denaturing treatment, molten steel cleanliness has been improved in Ca: S 〉=2.0, and makes residual nonmetal inclusion shape metamorphosis in the steel, the ribbon or the corynebacterium that are rolled to distribution by the edge before the reason of end become hammer-imitation type or spherical, improve the cold forming capability of steel plate.
4, Fe in the finished surface iron scale
3O
4Shared ratio can adapt to the user effectively and exempt from the pickling requirement all above 80%.
5, compare with the same level hot-rolled steel sheet of low C-Mn-V or alloying or the production of micro-Nb alloying, the 490MPa level hot rolled steel plate that adopts the present invention to produce has tangible cost advantage.Because C, Al element treatment process and interpolation similar weight, external refining, casting and hot-rolled process cost are identical, and the production cost difference of several modes is the cost of alloying element.Through measuring and calculating, its production cost is with low C-Mn-V microalloyed steel or carry out micro-Nb Alloying Treatment steel and compare, and low 172 yuan/ton and 75 yuan/ton respectively of production costs have tangible application value.The production technique that the present invention adopts is simple, production cost is lower, has high cost performance, promotes the use of to have good prospects.
6, the present invention adopts little Ti processing alloying scheme of the low little Nb-of Si-of low C-Mn-and controlled rolling and controlled cooling mode to produce, adopt external refining measure targetedly after the smelting, reduce inclusion to the cold roll forming Effect on Performance, the method of controlled rolling and controlled chilling is adopted in hot rolling, obtains a certain amount of ferrite, pearlitic structure.Assay shows that the 490MPa level hot rolled steel plate of producing by this method has good room-temperature mechanical property and processing performance, Fe in the finished surface iron scale
3O
4Shared ratio can adapt to automobile component enterprise and exempt from the pickling production requirement all above 80%, and the cost performance height of steel is promoted the use of and had good prospects.
Embodiment
It is as follows that 490MPa level of the present invention is exempted from the production method technical process of pickling hot-rolled steel sheet:
Converter smelting → LF refining → electrically heated → continuous casting → hot rolling → cool off → batch → finishing → packing warehouse-in
Converter smelting is specially blast-melted and smelting furnace material smelted in converter and obtains molten steel, then with deoxidation of molten steel and carry out alloying; In the molten steel after in the alloying step, carbonaceous material, aluminum-manganese-iron alloy and aluminum shot being joined deoxidation, obtain molten steel (by weight) and be C:0.04～0.11, Si:0.13～0.27, Mn:0.9～1.30, N:0.001～0.007, P:0～0.027, S:0～0.017, Al:0.01～0.09, Nb:0.013～0.027, Ti:0.004～0.012, Fe: surplus.The content of S is less than or equal to into 0.015% of stove molten iron gross weight in the feed stock for blast furnace in order to make, and can adopt low-sulfur molten iron or half steel to smelt.In order to prevent the especially scaling loss of manganese element of metallic element, the oxygen activity when strict control smelting process temperature and tapping, smelting condition is 1670～1690 ℃ of tapping temperatures, the oxygen activity condition is [a during tapping
0] 100～500PPm.The carbonaceous material that smelting process is added is a carbonaceous material well known in the art, is preferably in pitch coke, hard coal and the carbon dust one or more.The time of smelting is the time of the smelting of routine, is preferably 35～45 minutes.
The purpose of deoxidation of molten steel is to reduce oxygen activity of molten steel to improve yield of alloy, and described reductor is a ferro-aluminum, and the add-on of reductor is preferably the 3.0-4.0Kg/t steel.
The method that well known to a person skilled in the art is adopted in the mode of alloying step batch charging, external refining.Alloying step after the deoxidation comprises ferro-aluminum, carbonaceous material, silicomanganese, ferro-niobium is joined in the molten steel after the deoxidation, obtain molten steel (with described molten steel gross weight is benchmark, in simple substance) C:0.04～0.11, Si:0.13～0.27, Mn:0.9～1.30, N:0.001～0.007, P:0～0.027, S:0～0.017, Al:0.01～0.09, Nb:0.013～0.027, Ti:0.004～0.012, Fe: surplus.
For the chemical ingredients that guarantees steel is even, after the alloying molten steel jar is carried out argon bottom-blowing and handle.The condition that described argon bottom-blowing is handled is 1600～1650 ℃ of temperature, pressure 200～400 handkerchiefs, 4～8 minutes time.
The LF refinement step is finely tuned oxygen activity of molten steel, purity and temperature, utilizing secondary to feed Al line final deoxygenation control oxygen activity of molten steel is 20～40ppm, the argon gas of molten steel pot bottom feeding pressure 200～400Pa 4～6 minutes, it is condition that argon flow amount does not turn over molten steel very much, can avoid molten steel secondary oxidation and temperature to occur descends too fast, steel inclusion is fully floated, further improve the steel degree of cleaning.Feed in electrically heated and after mend feeding the Al line Ca-Si line (contain Ca 〉=24%, specification:
10mm) handle add-on 1000～1200m/ stove.
The electrically heated step is the operation that steel billet is reached be suitable for pouring temperature, is the basic working procedure that continuous casting steel is produced.Steel billet heated to adopt well known to a person skilled in the art various heating installations and heating means.
The continuous casting step can adopt the method for well known to a person skilled in the art, the inventive method is poured into the tundish of roasting in advance with molten steel after refining, and the continuous casting machine of protecting through whole process is cast into slab.After the casting, can cool off, as naturally cooling at room temperature according to ordinary method.
Hot-rolled step is that the slab of will cast is rolled after heating.Rolling purpose is to make the continuous casting steel billet of 490MPa level vehicle structure steel reach required thickness.The rolling pass of hot-rolled sheet steel band of the present invention is 6 of roughing, 5～6 of finish rolling, and every rolling every time rolling thickness of hot rolling material base that makes together of frame reduces 3～9 millimeters.
The hot rolled start rolling temperature refers to that steel billet enters the temperature of milling train, heats under this temperature, and fully solid solution microalloy element (Mn, Nb, Ti) is avoided reducing the effect of microalloy element in steel behind its formation liquation carbide.The hot rolled finishing temperature refers to that steel band goes out the temperature of finishing train, for thickness and the mechanical property that makes finished product is even, adopts hot rolling intermediate blank Coil Box Technology, make hot rolling intermediate blank stub bar before the finish rolling, in, afterbody keeps specific finishing temperature.Hot rolling Heating temperature of the present invention is 1200～1240 ℃, and the time is 1.1～1.9 hours, and the breaking down temperature of hot-rolled step is 1120～1220 ℃, and finishing temperature is 870～910 ℃; Temperature control in the course of hot rolling can make steel be in complete austenite structure before the finish rolling outlet; And it is too thick to avoid austenite structure precipitate NbC too thick and Nb to separate out the back size before finish rolling, and helping controlling the hot-rolled finished product ferrite grain size is 5.6～7.9 microns, improves Nb element precipitating reinforcing effect.
Cooling step can adopt the method for various routines.Generally, bring, comprise, batch rolling then through having adjusted the structural state of steel inside after the rolling thin plate steel band process cooling for sheet steel.For tissue and the performance requriements that satisfies hot-rolled sheet, the steel band that comes out from milling train must be cooled to coiling temperature and batch in a short period of time under very high speed of cooling.For example, described refrigerative speed is 15～35 ℃/second, is cooled to 550～585 ℃.
The detection method of chemical ingredients is respectively carbon steel and middle-low alloy steel spark source Atomic Emission Spectral Analysis method among the present invention, and national standard is GB/T4336.
The invention will be further elaborated below in conjunction with embodiment.Embodiment only is used to illustrate the present invention, rather than limits the present invention by any way.
Embodiment 1
A, smelting molten steel: smelting equipment is 120 tons of top blown converter, blast-melted as raw material, 1370 ℃ of blast-melted temperature, add steelmaking ingredient melting to the 1697 molten steel jar of ℃ tapping, the ferroaluminium that added 0.5 ton at 1/3 o'clock (Anyang good prosperous anti-material company limited) pre-deoxidation of tapping, add pitch coke (Flos Bombacis Malabarici Yangcheng metallurgic auxiliary materials company limited) and silicomanganese (Dechang iron alloy company limited) then in the molten steel after deoxidation, make the content of each composition in the molten steel for (gross weight with molten steel is a benchmark, wt%) C:0.06, Si:0.19, Mn:1.06, P:0.014, S:0.012, Nb:0.016, Ti:0.01, Al:0.05, N:0.0042, all the other are Fe.Chain-wales carries out the argon bottom-blowing processing to the molten steel jar outside stove subsequently, argon pressure 200～400Pa, and the time is 4 minutes.
Making the content of oxygen in molten steel by the addition of controlling reductor is 10～50ppm, prevents the manganese oxidation as far as possible, thereby guarantees that manganese exists with simple substance in the hot-rolled structural steel of preparation, rather than exists with oxide form, to give full play to the function of simple substance manganese.
B, LF electrically heated: secondary is fed Al line final deoxygenation, the molten steel pot bottom feeds certain pressure (200～400Pa) argon gas 6 minutes, it is condition that argon flow amount does not turn over molten steel very much, and to adding the Si-Ca line of 1000m by wire feeder to ladle, LF handles 1610 ℃ of final temperatures behind the blowing argon gas.
C, continuous casting: the molten steel jar is transported to casting position, the basal sliding mouth of a river Al matter stopper (company limited is assisted in Anyang smelting) of molten steel jar, and molten steel flows into tundish automatically, carries out continuous casting through Al matter stopper, drainage to crystallizer.Whole process adopts covering slag to protect casting, and the casting postcooling becomes the hot-rolled sheet steel billet.
D, hot rolling: the slab rolling temperature of coming out of the stove is 1226 ℃ (eliminating dendritic segregation, control original austenite grains sizes), and the roughing temperature is 1101 ℃, 899 ℃ of finish rolling finishing temperatures; The type of cooling adopts rolls back leading portion laminar flow water-cooled, and speed of cooling is 30 ℃/second, 560 ℃ of coiling temperatures.The rolling pass of finish rolling is 6, and every time rolling thickness of intermediate blank that makes is respectively 35～28 millimeters, 28～24 millimeters, 24～17 millimeters, 17～13 millimeters, 13～9 millimeters and 9～7 millimeters.
E, finishing: steel band is the packing warehouse-in after the crosscut unit is sheared.
The coiled sheet of preparation is carried out measuring mechanical property, detect yield strength Rel, tensile strength Rm and the elongation A of room temperature respectively
200mm, tensile property carries out according to GB/T228 metallic substance tensile test at room temperature method.Finished product yield strength (Rel) is 450MPa, and tensile strength (Rm) is 520MPa, unit elongation (A
200mm) be 20%, the cold bending process experimental performance is qualified, about finished product oxygen thickness of scale 10 μ m, Fe in the scale on surface
3O
4Ratio reach 85%, meet the technical qualification requirement that the 490MPa level is exempted from the pickling hot-rolled steel sheet.
Embodiment 2
The preparation method is substantially the same manner as Example 1, different is that the molten steel composition that converter smelting obtains is C:0.07, Si:0.18, Mn:1.10, P:0.014, S:0.006, Nb:0.020, Ti:0.01, Al:0.04, N:0.0034, all the other are Fe, (weight percent, %) the hot-rolled steel sheet of also producing with aforementioned molten steel, 1215 ℃ of slab tapping temperatures, finish rolling finishing temperature are 888 ℃, coiling temperature is 575 ℃, hot-rolled finished product thickness 7.0mm.
The coiled sheet of preparation is carried out measuring mechanical property, detect the tensile strength Rm and the elongation A of room temperature respectively
200mm, tensile property carries out according to GB/T228 metallic substance tensile test at room temperature method.Finished product yield strength (Rel) is 435MPa, and tensile strength (Rm) is 535MPa, unit elongation (A
200mm) be 20%, the cold bending process experimental performance is qualified, about finished product oxygen thickness of scale 10.5 μ m, Fe in the scale on surface
3O
4Ratio reach 86%, meet the technical qualification requirement that the 490MPa level is exempted from the pickling hot-rolled steel sheet.
Comparative Examples
The preparation method is substantially the same manner as Example 1, and different is that the molten steel composition that converter smelting obtains is C:0.08%, Si:0.25%, Mn:1.28%, P:0.019%, S:0.015%, Als:0.038%, all the other are Fe, and the hot-rolled steel sheet of producing with aforementioned molten steel, 1205 ℃ of slab tapping temperatures, finishing temperature are 875 ℃, coiling temperature is 595 ℃, hot-rolled finished product thickness 7.0mm.
The coiled sheet of preparation is carried out measuring mechanical property, detect the tensile strength Rm and the elongation A of room temperature respectively
200mm, tensile property carries out according to GB/T228 metallic substance tensile test at room temperature method.Finished product yield strength (Rel) is 365MPa, and tensile strength (Rm) is 475MPa, unit elongation (A
200mm) be 23%, the cold bending process experimental performance is qualified, about finished product oxygen thickness of scale 9 μ m, Fe in the scale on surface
3O
4Ratio be 62%, mechanical property and scale structure do not meet the technical qualification requirement that 490MPa exempts from the pickling hot-rolled steel sheet.
Claims (5)
1.490MPa level is exempted from the production method of pickling hot-rolled steel sheet, it is characterized in that: steps such as this method specifically comprise continuously cast bloom heating, hot rolling, cool off, batch; Wherein, the chemical ingredients of steel billet is by weight percentage: C:0.04～0.11, Si:0.13～0.27, Mn:0.9～1.30, N:0.001～0.007, P:0～0.027, S:0～0.017, Al:0.01～0.09, Nb:0.013～0.027, Ti:0.004～0.012, Fe: surplus; Billet heating temperature is 1200～1240 ℃; The open rolling of hot rolling breaking down temperature is 1120～1220 ℃, and finishing temperature is 870～910 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 550～585 ℃ of step temperature.
2. 490MPa level according to claim 1 is exempted from the production method of pickling hot-rolled steel sheet, it is characterized in that: steel billet heat-up time is 1.1～1.9 hours.
3. 490MPa level according to claim 1 is exempted from the production method of pickling hot-rolled steel sheet, it is characterized in that: the chemical ingredients of steel billet is C:0.05～0.10, Si:0.15～0.25, Mn:1.0～1.20, N:0.002～0.006, P:0～0.025, S:0～0.015, Al:0.02～0.08, Nb:0.015～0.025, Ti:0.005～0.010, Fe by weight percentage: surplus; Billet heating temperature is 1210～1230 ℃; The open rolling of hot rolling breaking down temperature is 1130～1200 ℃, and finishing temperature is 880～900 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 560～580 ℃ of step temperature.
4. 490MPa level according to claim 3 is exempted from the production method of pickling hot-rolled steel sheet, it is characterized in that: steel billet heat-up time is 1.2～1.8 hours.
5. exempt from the production method of pickling hot-rolled steel sheet according to each described 490MPa level of claim 1～4, it is characterized in that: cooling step refrigerative speed is 15～35 ℃/second.
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Cited By (8)
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| CN102671992A (en) * | 2012-05-29 | 2012-09-19 | 东北大学 | Method for making easy-to-pickle steel plate |
| CN103028608A (en) * | 2011-09-30 | 2013-04-10 | 鞍钢股份有限公司 | Hot-rolled strip steel surface scale component and thickness control method |
| WO2015180500A1 (en) * | 2014-05-30 | 2015-12-03 | 宝山钢铁股份有限公司 | Method for producing hot-plated product by hot rolling, direct cold rolling without pickling, and reduction annealing |
| CN105369134A (en) * | 2015-11-12 | 2016-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel plate for 400MPa-level acid-pickling-free automobile structure and production method of hot rolled steel plate |
| CN107699798A (en) * | 2017-11-24 | 2018-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 610MPa level hot rollings |
| CN107747044A (en) * | 2017-11-24 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 560MPa level hot rollings |
| CN107904503A (en) * | 2017-11-24 | 2018-04-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 510MPa grades of hot rollings |
| CN112695243A (en) * | 2020-12-01 | 2021-04-23 | 广西柳钢华创科技研发有限公司 | Steel plate SM490B for welded structure |
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| CN103028608A (en) * | 2011-09-30 | 2013-04-10 | 鞍钢股份有限公司 | Hot-rolled strip steel surface scale component and thickness control method |
| CN102671992A (en) * | 2012-05-29 | 2012-09-19 | 东北大学 | Method for making easy-to-pickle steel plate |
| WO2015180500A1 (en) * | 2014-05-30 | 2015-12-03 | 宝山钢铁股份有限公司 | Method for producing hot-plated product by hot rolling, direct cold rolling without pickling, and reduction annealing |
| CN105369134A (en) * | 2015-11-12 | 2016-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel plate for 400MPa-level acid-pickling-free automobile structure and production method of hot rolled steel plate |
| CN105369134B (en) * | 2015-11-12 | 2017-07-04 | 攀钢集团攀枝花钢铁研究院有限公司 | 400MPa grades is exempted from pickling vehicle structure hot rolled steel plate and its production method |
| CN107699798A (en) * | 2017-11-24 | 2018-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 610MPa level hot rollings |
| CN107747044A (en) * | 2017-11-24 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 560MPa level hot rollings |
| CN107904503A (en) * | 2017-11-24 | 2018-04-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Pickling vehicle structure steel plate and its production method are exempted from 510MPa grades of hot rollings |
| CN112695243A (en) * | 2020-12-01 | 2021-04-23 | 广西柳钢华创科技研发有限公司 | Steel plate SM490B for welded structure |
| CN112695243B (en) * | 2020-12-01 | 2021-09-24 | 广西柳钢华创科技研发有限公司 | Steel plate SM490B for welded structure |
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| CN101935802B (en) | 2012-07-04 |
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