CN101935801A - Hot rolled steel plate of 490 MPa level and production method thereof - Google Patents
Hot rolled steel plate of 490 MPa level and production method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy, and in particular relates to a micro-niobium alloy hot rolled steel plate of a 490 MPa level and a production method thereof, aiming to solving the first technical problem of providing the hot rolled steel plate of the 490 MPa level with excellent comprehensive performance. The hot rolled steel plate of the 490 MPa level is prepared from the following chemical components 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 hot rolled steel plate of the 490 MPa level, which is provided by the invention, reaches the yield strength not less than 380 MPa, tensile strength not less than 490 MPa, elongation not less than 17 percent and excellent cold bending performance, has favorable room-temperature mechanical performance and process performance and fully accords with the requirements on technical indexes.
Description
Technical field
The invention belongs to metallurgical technology field, the production method of the little niobium alloy hot-rolled steel sheet of particularly a kind of 490MPa level.
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, to the also corresponding raising of the service requirements of automobile steel material.
For cargo truck, hot-rolled steel sheet for automobile is one of the strictest material of specification of quality in the automobile structure, except that the conventional structure strength property requires, also must possess good processability, anti-pitting, enough structural rigidity and welding property, do not break to bear the impact briquetting under the various strain conditions, avoid vehicle body generation local deformaton in the loading process, can absorb energy when the collision accident particularly takes place to greatest extent, guarantee 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 to guarantee the service requirements of low-cost steel under the prerequisite of mechanical property when buying 490MPa level hot rolled steel plate.490MPa level hot rolled steel plate salient features requires to see Table 1.
Table 1 490MPa level hot-rolled structural steel mechanical property and processing performance requirement
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
First technical problem to be solved by this invention provides a kind of 490MPa level hot rolled steel plate of high comprehensive performance.
The chemical ingredients of 490MPa level hot rolled steel plate of the present invention 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.
Preferably, the chemical ingredients of 490MPa level hot rolled steel plate is by weight percentage: 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.
The heterogeneous microstructure of 490MPa level hot rolled steel plate of the present invention comprises ferrite and perlite, is benchmark with the crystalline structure cumulative volume, and ferritic percent by volume is 88～90%, and pearlitic percent by volume is 10～12%.
Ferrite refers to C and is dissolved in formed interstitial solid solution among α-Fe, has body-centered cubic crystal structure.Perlite is one of metallographic form of steel, the isothermal transformation product of steel supercooled austenite, its constituent by weight α-Fe account for 88%, Fe
3C accounts for 12%, and its profile is divided into sheet and granular (relevant with steel supercooled austenite speed of cooling).For soft steel, the uniform austenite cooling of chemical ingredients back forms lamellar pearlite usually, if the austenite uneven components when especially having secondary cementite remaining, can form granular pearlite.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.
490MPa level hot rolled steel plate provided by the invention has good room-temperature mechanical property and processing performance, meets the requirement of technical indicator fully.
Second technical problem to be solved by this invention provides the production method of above-mentioned 490MPa level hot rolled steel plate, specifically comprises steel billet heating, hot rolling, cools off and batch step.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; Steel billet heating steps temperature is 1200～1250 ℃; The breaking down temperature of hot-rolled step is 1080～1220 ℃, and finishing temperature is 830～910 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 590～640 ℃ of step temperature.
Steel billet heat-up time be 1～2 hour.
Preferably, 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.Steel billet heating steps temperature is 1210～1240 ℃; The breaking down temperature of hot-rolled step is 1100～1200 ℃, and finishing temperature is 850～890 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 595～620 ℃ of step temperature.
Steel billet heat-up time be 1.2～1.8 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.
The invention has the beneficial effects as follows:
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.
Adopt the low-carbon-equivalent scheme during chemical composition design, the steel plate welding property is good.
The 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 being untreated become hammer-imitation type or spherical, improve the cold forming capability of steel plate.
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.
Production technique of the present invention is simple, production cost is lower, has high cost performance, promotes the use of to have good prospects.
The present invention adopts the little Ti of the low little Nb-of C-Mn-to handle the alloying scheme and the controlled rolling and controlled cooling mode is produced, 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, obtain a certain amount of ferrite and pearlitic structure, the conventional mechanical property of control steel.Assay shows that the 490MPa level hot rolled steel plate of producing by this method has good room-temperature mechanical property and processing performance, the cost performance height.
Embodiment
The production method technical process of the 490MPa level hot rolled steel plate that the present invention relates to is as follows:
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, the molten steel composition that obtains is (a weight percent, with the 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.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 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 the Ca-Si line in electrically heated and after mending hello Al line and (contain Ca 〉=24%, specification: φ 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 steel reach required thickness.The rolling pass of hot-rolled sheet steel band of the present invention is 4～6 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 is meant 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 1200～1250 ℃, and the time is 1～2 hour, and the breaking down temperature of hot-rolled step is 1080～1220 ℃, and finishing temperature is 830～910 ℃; 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 10～30 ℃/second, is cooled to 590～640 ℃.
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, 1375 ℃ of blast-melted temperature, add steelmaking ingredient melting to the 1695 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:0.08, Si:0.20, Mn:1.10, P:0.014, S:0.010, Nb:0.02, Ti:0.01, Al:0.044, N:0.0038, 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 4 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 1600 ℃ 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 1228 ℃ (eliminating dendritic segregation, control original austenite grains sizes), and the roughing temperature is 1118 ℃, 878 ℃ of finish rolling finishing temperatures; The type of cooling adopts rolls back leading portion water-cooled, and speed of cooling is 35 ℃/second, is cooled to 600 ℃ and batches.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 460MPa, and tensile strength (Rm) is 530MPa, unit elongation (A
200mm) be 21%, the cold bending process experimental performance is qualified, meets the technical qualification requirement of 490MPa 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 (wt%) C:0.07, Si:0.23, Mn:1.13, P:0.015, S:0.006, Nb:0.018, Ti:0.01, Al:0.037, N:0.0034, all the other are Fe, and the hot-rolled steel sheet of producing with aforementioned molten steel, 1205 ℃ of slab tapping temperatures, the finish rolling finishing temperature is 888 ℃, and coiling temperature is 605 ℃, hot-rolled finished product thickness 7.0mm.
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 415MPa, and tensile strength (Rm) is 510MPa, unit elongation (A
200mm) be 23%, the cold bending process experimental performance is qualified, meets the technical qualification requirement of 490MPa 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:0.09%, Si:0.19%, Mn:1.38%, P:0.016%, S:0.013%, Al:0.054%, all the other are Fe, and the hot-rolled steel sheet of producing with aforementioned molten steel, 1200 ℃ of slab tapping temperatures, finishing temperature are 865 ℃, coiling temperature is 585 ℃, hot-rolled finished product thickness 7.0mm.
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 350MPa, and tensile strength (Rm) is 455MPa, unit elongation (A
200mm) be 25%, the cold bending process experimental performance is qualified, and mechanical property does not meet the technical qualification requirement of 490MPa hot-rolled steel sheet.
Claims (8)
1.490MPa level hot rolled steel plate is characterized in that: chemical ingredients 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.
2. 490MPa level hot rolled steel plate according to claim 1 is characterized in that: chemical ingredients is by weight percentage: 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.
3. 490MPa level hot rolled steel plate according to claim 1 and 2, it is characterized in that: its heterogeneous microstructure comprises ferrite and perlite, with the crystalline structure cumulative volume is benchmark, and ferritic percent by volume is 88～90%, and pearlitic percent by volume is 10～12%.
4.490MPa the production method of level hot rolled steel plate, specifically comprise steel billet heating, hot rolling, cool off and batch step, it is characterized in that: 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; Steel billet heating steps temperature is 1200～1250 ℃; The breaking down temperature of hot-rolled step is 1080～1220 ℃, and finishing temperature is 830～910 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 590～640 ℃ of step temperature.
5. the production method of 490MPa level hot rolled steel plate according to claim 4 is characterized in that: steel billet heat-up time be 1～2 hour.
6. the production method of 490MPa level hot rolled steel plate according to claim 4 is characterized in that: the chemical ingredients of steel billet is by weight percentage: 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; Steel billet heating steps temperature is 1210～1240 ℃; The breaking down temperature of hot-rolled step is 1100～1200 ℃, and finishing temperature is 850～890 ℃; Cooling step adopts and rolls back leading portion laminar flow water-cooled; Batch 595～620 ℃ of step temperature.
7. the production method of 490MPa level hot rolled steel plate according to claim 6 is characterized in that: steel billet heat-up time be 1.2～1.8 hours.
8. according to the production method of each described 490MPa level hot rolled steel plate of claim 4～7, it is characterized in that: the refrigerative speed of cooling step is 10～30 ℃/second.
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| CN103842539B (en) * | 2011-09-29 | 2016-01-20 | 杰富意钢铁株式会社 | Hot-rolled steel sheet and manufacture method thereof |
| US9574254B2 (en) | 2011-09-29 | 2017-02-21 | Jfe Steel Corporation | Hot-rolled steel sheet and method for producing same |
| US10301698B2 (en) | 2012-01-31 | 2019-05-28 | Jfe Steel Corporation | Hot-rolled steel sheet for generator rim and method for manufacturing the same |
| CN104903484A (en) * | 2013-01-10 | 2015-09-09 | 株式会社神户制钢所 | Hot-rolled steel plate exhibiting excellent cold workability and excellent surface hardness after working |
| CN104313468A (en) * | 2014-11-14 | 2015-01-28 | 武汉钢铁(集团)公司 | Steel plate for 460MPa grade low-alloy high-strength structure and production method of steel plate |
| CN106222385A (en) * | 2016-07-22 | 2016-12-14 | 武汉钢铁股份有限公司 | The production method of high carbon tool steel hot rolled steel sheet |
| CN109536847A (en) * | 2017-09-21 | 2019-03-29 | 上海梅山钢铁股份有限公司 | 390MPa grades of welded tube hot rolled steel plates of yield strength and its manufacturing method |
| CN109536847B (en) * | 2017-09-21 | 2020-12-08 | 上海梅山钢铁股份有限公司 | Hot rolled steel plate for welded pipe with yield strength of 390MPa and manufacturing method thereof |
| CN111187981A (en) * | 2020-02-13 | 2020-05-22 | 辽宁科技大学 | Production process of Nb-containing high-strength high-toughness hot-rolled steel sheet pile |
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Application publication date: 20110105 |