CN102978525B - Manufacturing method for thin-sized hot-continuous-rolled steel for furniture - Google Patents
Manufacturing method for thin-sized hot-continuous-rolled steel for furniture Download PDFInfo
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- CN102978525B CN102978525B CN201210476766.8A CN201210476766A CN102978525B CN 102978525 B CN102978525 B CN 102978525B CN 201210476766 A CN201210476766 A CN 201210476766A CN 102978525 B CN102978525 B CN 102978525B
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Abstract
The invention discloses a thin-sized hot-continuous-rolled steel for furniture and a method for producing the same. The steel comprises the following chemical components by weight percent: 0.05-0.07% of C, 0.20-0.30% of Si, 1.8-2.0% of Mn, 0.070-0.090% of Nb, 0.0010-0.0020% of B, 0.14-0.20% of Ti, 0.50-0.60% of Cr, 0.01-0.06% of Al, no more than 0.02% of P, no more than 0.010% of S, no more than 0.008% of N and the balance of Fe and inevitable impurities. According to the thin-sized hot-continuous-rolled steel for furniture and the method for producing the same, elements of Cr and Ti are added for compounding, and thermo mechanical control process (TMCP) technological parameters are controlled, thus, a superfine lath bainite structure with excellent comprehensive performance is obtained, the yield strength of the material is enabled not to be less than 800 mega pascals, and moreover, the steel has good ductility and toughness.
Description
Technical field
The present invention relates to ferrous materials production technical field, particularly employing hot tandem produces the production method that Thin Specs yield strength is the steel for furniture roll bending of 800MPa level.
Background technology
The main application of steel for furniture is the web member of sectional sofa, the support etc. of bed structure.Existing patent and document rarely have report to steel for furniture, by finding domestic and international market investigation: steel for furniture mainly adopts Q345 rank hot continuous rolling coiled sheet and part quenched and tempered steel at present, such as, the modifier treatment of 45# steel is adopted to obtain the web member of high strength Thin Specs steel for furniture.
For the raw-material production of steel for furniture, the deficiencies in the prior art show two aspects: one is generally adopt general plate, because the intensity rank of material is on the low side, for ensureing the force request in use procedure, cause the design thickness of material thicker, increase furniture weight, for carrying and assembling bring inconvenience; Two is heat-treat for employing steel the production method that technique obtains high-strength steel, in roll-forming process, adopt online induction heat treatment, have a strong impact on process velocity, cause production capacity to decline, induction heat treatment current consumption is comparatively large simultaneously, and causing cost increases and the wasting of resources.
Publication number is the Chinese patent of 101560629, describes the hot-rolled sheet coil of the thick yield strength 800MPa rank of a kind of 2-14mm, C content 0.08-0.14% in chemical composition, does not add Cr and B element, main precipitating reinforcing effect, the raising intensity relying on Ti.Technology controlling and process aspect, the temperature that reheats that the technical scheme of this patent adopts is 1220-1280 DEG C, and roughing end temp is 980-1070 DEG C, and finish rolling finishing temperature is 760-860 DEG C, and coiling temperature is 450-600 DEG C.The technique thinking of the program is for adopting low temperature controlled rolling crystal grain thinning, in conjunction with in warm rolling get nano level separate out improve the strength of materials, but in the Industrial processes of reality, domestic hot tandem is all difficult to realize so low rolling temperature, particularly in production Thin Specs high-strength steel process, be limited to mill capacity and be difficult to realize stably manufactured.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of production method of Thin Specs hot continuous rolling steel for furniture, and the production method solving existing Thin Specs hot continuous rolling steel for furniture cannot realize the problem of stably manufactured because rolling temperature is too low.
For solving the problems of the technologies described above, the invention provides a kind of Thin Specs hot continuous rolling steel for furniture, the chemical composition of steel is by weight percentage: C:0.05 ~ 0.07%, Si:0.20-0.30%, Mn:1.8 ~ 2.0%, Nb:0.07 ~ 0.09%, B:0.0010% ~ 0.0020%, Ti:0.14 ~ 0.20%, Cr:0.50 ~ 0.60%, Al:0.01 ~ 0.06%, P :≤0.02%, S :≤0.010%, N :≤0.008%, all the other are Fe and inevitable impurity.
Further, the thickness of described steel for furniture is 2-4mm.
In order to solve the problem, present invention also offers the production method of Thin Specs hot continuous rolling steel for furniture, comprising:
Carry out successively smelting, continuous casting, reheat, roughing, finish rolling and batch;
Reheating temperature described in control is 1280 ~ 1300 DEG C;
Between described roughing and finish rolling two techniques, use strip edge heater, improve intermediate blank transverse temperature homogeneity;
Controlling roughing end temp is 1080-1120 DEG C;
Controlling finish rolling finishing temperature is 880-920 DEG C;
Control coiling temperature is 380-460 DEG C.
Further, the Heating temperature controlling described strip edge heater is 1100 DEG C-1200 DEG C.
Further, controlling described coiling temperature is 400-450 DEG C.
The effect of main alloy element of the present invention is as follows:
Carbon: carbon improves the most economical effective element of the strength of materials, but too high C content can to the plasticity of deterioration material, toughness and welding property.The raising meeting remarkably influenced Pcm value of C content, makes easily to occur surface hardening phenomenon after welding, increases welding cold cracking and occur tendency.The carbon content that the present invention adopts is 0.05% ~ 0.07%, and main consideration ensures that material has good plasticity and toughness and controls carbon equivalent.
Silicon: silicon is solution strengthening element, but add too high silicon and can have a negative impact to the plasticity and toughness of material, can welding heat influence area toughness be reduced simultaneously.It is 0.20% ~ 0.30% that the present invention adds silicone content.
Manganese: manganese has solution strengthening effect, can improve material hardening capacity simultaneously, be improve one of strength of materials important element, but Fe content adds too high easy generation segregation and can reduce toughness of material, degrade performance.It is 1.80% ~ 2.00% that the present invention adds Fe content.
Sulphur and phosphorus: sulphur and the too high meeting of phosphoric have disadvantageous effect to toughness of material and plasticity.Present invention defines sulphur content should control within 0.01%, phosphorus content should control within 0.02%.
Aluminium: aluminium is deoxidant element, has certain grain refining effect simultaneously.Present invention defines aluminium content is 0.01% ~ 0.06%.
Boron: add the hardening capacity that a certain amount of B significantly improves material, ensures to obtain desirable phase-change organization thus improves the strength of materials.Add B in addition and to make in welded heat affecting zone coarse grain zone microstructure by granular bainite to lath-shaped bainite or martensitic transformation, thus improve welded heat affecting zone intensity.Due to B more difficult control in smelting process, and be easy to Grain Boundary Segregation, therefore should limit the interpolation upper limit is 20ppm.
Niobium: the main purpose of adding Nb is crystal grain thinning, and the present invention adds 0.070%-0.090%Nb, ensures still to obtain small grains under higher rolling temperature condition, thus realizes the matched well of the strength of materials and toughness.
Titanium: Ti Main Function is in the present invention fining austenite grains, and the precipitate of the Ti simultaneously in the operation of rolling has stronger precipitating reinforcing effect, is conducive to the raising of intensity.The present invention adds the Ti of 0.14% ~ 0.20.
Chromium: Cr has the effect of raising material hardening capacity, and the present invention with the addition of the Cr element of 0.5%-0.6%, ensures to obtain ultra-fine ferrite bainite tissue in process of cooling.
Nitrogen: the plasticity of nitrogen content too high meeting severe exacerbation material and toughness, but consider that TiN grows up to prevention austenite, thinning microstructure plays advantageous effect, and the present invention limits steel grade can exist the N being less than 80ppm.
Compound of the present invention adds Cr, Ti two kinds of elements, and ensures that the mass percentage of Cr and Ti two kinds of elements is between 0.64%-0.8%, relies on the TMCP technique that design is suitable, obtains ultra-fine lath-shaped bainite structure, ensure that the obdurability coupling that material is high.
The controlling of production process main points that the present invention adopts are that smelting process is control P, S, N content strictly, ensure slab quality.The operation of rolling strictly controls each controlled rolling, cooling control technology parameter, ensure the operation of rolling carry out smoothly and the mechanical property of material qualified.
The temperature that reheats that the present invention adopts is 1280 DEG C ~ 1300 DEG C, adopts the object of higher Heating temperature to be more abundant as the compound dissolution of Ti, Nb of being formed in strand of guarantee austenite homogenizing and alloying element.In addition, higher Heating temperature is conducive to keeping higher temperature in the follow-up operation of rolling, Reducing distortion drag, ensures that the operation of rolling is coherent, stable.
Use strip edge heater to improve intermediate blank transverse temperature homogeneity between roughing and finish rolling, strip edge heater Heating temperature adopts 1100 DEG C-1200 DEG C.The object using strip edge heater is to make up Thin Specs steel billet in the operation of rolling, because edge rapid heat dissipation causes temperature to decline greatly, cause edge temperature at finish rolling or the too low generation proeutectoid ferrite of temperature after going out finish rolling, and the generation of proeutectoid ferrite can cause edge intensity too low.
Roughing end temp adopts the object of 1080-1120 DEG C to be to ensure the rolling temperature that the finish rolling stage is higher, reduces rolling load, ensures that rolling is carried out smoothly.
Finish rolling finishing temperature adopts the object of 880-920 DEG C to be in order to the higher rolling temperature of a few frame after ensureing finish rolling, thus reduces rolling load, and high finish rolling finishing temperature is conducive to improving roll speed and improving online strip shape quality simultaneously.
Coiling temperature adopts 400-450 DEG C, can ensure to obtain half ultra-fine strip bainite tissue on the one hand, can reduce the impact of too low coiling temperature to reeling machine equipment on the other hand, ensures carrying out smoothly of coiling process.
The production method of Thin Specs hot continuous rolling steel for furniture provided by the invention, adopt the design of low-cost alloy element, compound with the addition of 0.5%-0.6%Cr, 0.14%-0.20%Ti element, obtains the ultra-fine ferrite bainite tissue of high comprehensive performance; Propose the TMCP processing parameter temperature range with stronger Industrial Applicability simultaneously, ensure that industrial stablizing carries out and Fracture of Material coupling.After the roll bending using production method provided by the invention to produce can be passed through rip cutting bundling, carry out roll-forming and impact briquetting, be applicable to manufacture sectional sofa chaining part, bedstead etc.The production method of Thin Specs hot continuous rolling steel for furniture provided by the invention has following beneficial effect:
The first, be conducive to energy-conservation.Adopt hot continuous rolling TMCP Direct Rolling to go out to meet the high strength steel for furniture of user's service requirements, user eliminates heat treatment step, and production capacity significantly promotes, and is conducive to solving electric energy simultaneously.
The second, user's processing is conducive to.The Thin Specs steel for furniture that the present invention produces, except having higher intensity, has good unit elongation and cold-bending property simultaneously.Not only be applicable to rolling forming process, be equally applicable to bending press punch forming process, applied widely.
Three, be conducive to the work-ing life of improving product, strengthen security.The Thin Specs steel for furniture that the present invention produces has higher cleanliness factor, and steel grade harmful element is controlled, and the fatigue limit of materials significantly promotes relative to straight carbon steel, and material has longer work-ing life and stronger security.
Four, be conducive to cost-saving.Not containing Mo, Ni, Cu noble metal in the cost of alloy of the present invention's design, mainly rely on Cr, Ti, B to coordinate TMCP technology controlling and process to improve obdurability, there is lower production cost.
Five, be conducive to realizing suitability for industrialized production.In the TMCP processing parameter that the present invention adopts, Heating temperature, roughing temperature and final rolling temperature all have employed higher temperature range scope, have good industrial implementation.
Embodiment
Embodiment one
The Thin Specs hot continuous rolling steel for furniture that the embodiment of the present invention one provides, its component system is as shown in table 1.
Table 1
| C | Si | Mn | P | S | Al | Cr | Nb | Ti | B | [N] |
| 0.065 | 0.25 | 1.90 | 0.010 | 0.002 | 0.045 | 0.52 | 0.073 | 0.15 | 0.0014 | 0.004 |
Embodiment two
The production method of the Thin Specs hot continuous rolling steel for furniture that the embodiment of the present invention two provides, according to the chemical composition of embodiment one, produce 2-4mm Thin Specs 800MPa level steel for furniture, production process route adopts 220 tons of converter smeltings-LF refining---and RH vacuum-treat-continuous casting-process furnace reheats-roughing-7 frame finish rolling-section cooling-batch rolling.
To smelt in 220 tons of converters and continuous casting of molten steel through external refining becomes strand, be rolled at 1580 hot continuous rolling production lines, it is 1280 ~ 1300 DEG C that control reheats temperature, controlling roughing end temp is 1080 DEG C ~ 1100 DEG C, between roughing and finish-rolling process, use edge induction heater, its Heating temperature is 1100-1150 DEG C, and controlling finish rolling finishing temperature is 880 DEG C ~ 900 DEG C, be chilled to target coiling temperature 400 DEG C-450 DEG C through section cooling after rolling and coil into coil of strip, rear air cooling is to room temperature.The mechanical property of the Thin Specs hot continuous rolling steel for furniture that the embodiment of the present invention two is produced is as shown in table 2:
Table 2
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. a production method for Thin Specs hot continuous rolling steel for furniture, is characterized in that, comprises:
Carry out successively smelting, continuous casting, reheat, roughing, finish rolling and batch;
Reheating temperature described in control is 1280 ~ 1300 DEG C;
Between described roughing and finish rolling two techniques, use strip edge heater, improve the homogeneity of the transverse temperature of intermediate blank;
Controlling roughing end temp is 1080-1120 DEG C;
Controlling finish rolling finishing temperature is 880-920 DEG C;
Control coiling temperature is 380-460 DEG C;
The Heating temperature controlling described strip edge heater is 1100 DEG C-1200 DEG C;
Controlling described coiling temperature is 400-450 DEG C;
Wherein, the chemical composition of steel is by weight percentage: C:0.05 ~ 0.07%, Si:0.20-0.30%, Mn:1.8 ~ 2.0%, Nb:0.070 ~ 0.090%, B:0.0010% ~ 0.0020%, Ti:0.14 ~ 0.20%, Cr:0.50 ~ 0.60%, Al:0.01 ~ 0.06%, P :≤0.02%, S :≤0.010%, N :≤0.008%, all the other are Fe and inevitable impurity.
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| CN201210476766.8A CN102978525B (en) | 2012-11-20 | 2012-11-20 | Manufacturing method for thin-sized hot-continuous-rolled steel for furniture |
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| CN102978525B true CN102978525B (en) | 2015-05-27 |
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| CN103484764B (en) * | 2013-09-11 | 2015-09-30 | 首钢总公司 | Ti precipitation strength type superhigh-strength hot rolls thin plate and production method thereof |
| CN113088816B (en) * | 2021-03-27 | 2021-10-12 | 京泰控股集团有限公司 | Steel material for furniture and preparation method thereof |
Citations (2)
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| US6364968B1 (en) * | 2000-06-02 | 2002-04-02 | Kawasaki Steel Corporation | High-strength hot-rolled steel sheet having excellent stretch flangeability, and method of producing the same |
| CN1448528A (en) * | 2002-03-29 | 2003-10-15 | 川崎制铁株式会社 | Cold-rolled steel plate having superfine grained structure and manufacturing method thereof |
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| JP4978741B2 (en) * | 2010-05-31 | 2012-07-18 | Ｊｆｅスチール株式会社 | High-strength hot-rolled steel sheet excellent in stretch flangeability and fatigue resistance and method for producing the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6364968B1 (en) * | 2000-06-02 | 2002-04-02 | Kawasaki Steel Corporation | High-strength hot-rolled steel sheet having excellent stretch flangeability, and method of producing the same |
| CN1448528A (en) * | 2002-03-29 | 2003-10-15 | 川崎制铁株式会社 | Cold-rolled steel plate having superfine grained structure and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
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| 板带加热器(Bar Heater)和边部加热器技术;Tetsuji Doizaki 等;《2004中国国际钢铁大会技术交流会论文集》;20040601;第366、374页 * |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |