CN103952633A - high-strength steel wire rod with good low temperature impact toughness and production method thereof - Google Patents
high-strength steel wire rod with good low temperature impact toughness and production method thereof Download PDFInfo
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- CN103952633A CN103952633A CN201410180818.6A CN201410180818A CN103952633A CN 103952633 A CN103952633 A CN 103952633A CN 201410180818 A CN201410180818 A CN 201410180818A CN 103952633 A CN103952633 A CN 103952633A
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Abstract
The invention discloses a high-strength steel wire rod with good low temperature impact toughness and a production method of the high-strength steel wire rod. The high-strength steel wire rod contains the following steel type components by weight percent: 0.30%-0.50% of C, 0.10%-0.40% of Si, 0.70%-1.00% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.70%-1.20% of Cr, 0.10 %-0.30% of Mo, and the balance of Fe and trace impurities. The high-strength steel wire rod contains small and uniform in crystalline grains, and is low in ductile-brittle transition temperature, and has high material strength and toughness. The high-strength steel wire rod is free of other precious metals, is low in heat treatment cost, and has the characteristics of low production cost and low using cost. The method controls the austenitizing degree and phase change temperature by adjusting the temperatures of heating, finish rolling and spinning, as well as cooling speed, and the low temperature impact toughness of the product is improved by improving the grain size of the product and reducing the ductile-brittle transition temperature. The method does not need to increase equipment or investment, does not increase the production cost, and makes full use of existing equipment and process, so that the method has the characteristics of low cost and low product use cost.
Description
Technical field
The present invention relates to a kind of steel wire rod, especially a kind of high-strength steel wire and production method thereof with favorable low-temperature impact toughness.
Background technology
Along with becoming increasingly conspicuous of Environmental Protection in China problem, power supply gradually nervous, wind-power electricity generation, as one of generation mode of a kind of renewable energy source of energy-conserving and environment-protective, is more and more favored.Wind-power electricity generation has not only been confined to land platform development, strides forward to ocean platform.Along with the development of wind-powered electricity generation industry, wind power plant is also faced with unprecedented challenge with the production of high strength bolt, the expansion of installed capacity of wind-driven power, requirement to high strength bolt performance index is also more and more higher, not only require it to there is high intensity, simultaneously also more and more higher to plasticity and toughness reguirements, the especially military service under deep sea low temperature, require cold plasticity very strict, international standard requires to carry out ballistic work detection at-101 DEG C.Conventional high strength bolt with wire rod in the well-to-do span of control of controlled rolling and controlled cooling; all can obtain satisfied Microstructure and properties; but the high strength bolt wire rod of being on active service as wind-powered electricity generation; adopt conventional controlled rolling and controlled cooling mode often can not make material obtain desirable tissue and performance; often there will be not through hardening, tissue odds even, the problem such as low-temperature flexibility is poor.China is vast in territory, seashore line length, has abundant wind energy resources, the coastal and island that wind energy resources is abundant, it can exploitation amount be about 1,000,000,000 kW, is mainly distributed in the provinces such as Liaoning, Hebei, Shandong, Jiangsu, Shanghai, Zhejiang, Fujian, Guangdong, Guangxi and Hainan.From the year ends 1996～2013, China's wind-powered electricity generation installation total volume only breaks through 3000MW, the wind-powered electricity generation space that still grows a lot, make wind-powered electricity generation high strength bolt have the very wide market requirement, but wind-powered electricity generation industry awaits the improvement and bring new ideas of production technique to the requirements at the higher level of bolt performance index.
Because low-temperature impact toughness requirement is stricter, most of dependence on import, the at present domestic high strength about low-temperature impact toughness is less with steel wire rod and production method thereof.In patent No. CN200810014488.8, disclose " a kind of have favorable low-temperature impact toughness add boron H shaped steel and preparation method thereof ", it adopts niobium alloy to improve grain fineness number, and adds boron to improve its hardening capacity, the ballistic work at finally having ensured-40 DEG C; But greatly increase production cost.Application number 201310054382.1 discloses " a kind of method of the 40CrNiMoA of raising material at low temperature impelling strength ", it is by carrying out deep cooling and low-temperaturetempering processing to wire rod, has met the ballistic work requirement of low temperature-80 DEG C; But compare than conventional downstream heat treatment process, cost increases, and shows and added valuable Ni from the trade mark.A kind of steel wire for cold forging and manufacture method thereof are disclosed in international monopoly (PCT/KR2004/003107), this steel wire has good low-temperature impact toughness, when adding again higher Cr, Mo element, add B element, and downstream heat treatment process is optimized, increase cost and production cycle.
Above patent, by adding the means of noble metal and reinforcement downstream heat treatment process, improves the low-temperature impact toughness of wind-powered electricity generation high strength bolt.How can be controlled by the production process of high strength bolt wire rod at wind-powered electricity generation, to utilize the existing rolling equipment of steel mill, not add other noble metals, reduce downstream client's thermal treatment cost simultaneously, support China's wind-powered electricity generation cause, be a problem demanding prompt solution.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of existing rolling equipment of steel mill, high-strength steel wire with favorable low-temperature impact toughness that cost is low of utilizing; The present invention also provides a kind of production method of the high-strength steel wire with favorable low-temperature impact toughness.
For solving the problems of the technologies described above, the weight percentage of the steel grades that the present invention takes is: C 0.30%～0.50%, Si 0.10%～0.40%, Mn 0.70%～1.00%, P≤0.020%, S≤0.020%, Cr 0.70%～1.20%, Mo 0.10%～0.30%, surplus is Fe and trace impurity.
Wire rod of the present invention is 28J～40J at the ballistic work of-101 DEG C.
The inventive method comprises smelts and continuous casting working procedure, heating process, rolling process, the operation of weaving silk and refrigerating work procedure; The weight percent of described smelting and continuous casting working procedure gained steel billet composition is: C 0.30%～0.50%, Si 0.10%～0.40%, Mn 0.70%～1.00%, P≤0.020%, S≤0.020%, Cr 0.70%～1.20%, Mo 0.10%～0.30%, surplus is Fe and trace impurity.
Heating process described in the inventive method: by heating steel billet to 1000～1100 DEG C, insulation;
Described rolling process: roll and finish rolling during steel billet is carried out slightly; Entering final rolling temperature is 850～900 DEG C;
The described operation of weaving silk: laying temperature is controlled at 800～850 DEG C;
Described refrigerating work procedure: after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 0.5～1.5 DEG C/s.
Soaking time described in the inventive method in heating process is 70～130min.
Described in the inventive method in rolling process, steel billet carries out 6+8 passage and rolls in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling.
The principle that the inventive method adopts is: on high speed mill, adopt low temperature rolling, reach the object of crystal grain thinning, crystal grain thinning is current a kind of unique method that had not only improved the strength of materials but also increased toughness.The ductile-brittle transition temperature of steel and ferrite grain size d-1/2 are linear.Crystal grain thinning improves the mechanism of toughness of material: crystal boundary is the resistance of crack propagation, and in the time that crystal grain diminishes, grain boundary area increases, thereby forward position, interface is filled in long-pending dislocation number and is tailed off, be conducive to slow down stress concentration, the impurity concentration on crystal boundary face also diminishes simultaneously, has also reduced along brilliant brittle rupture.
The inventive method adopts lower Heating temperature, reduces original austenite grains, avoids mixed crystal; In addition, in low entering under final rolling temperature and cooling initial temperature, control material in the district's finish rolling of austenite non-recrystallization, disperse educt, crystal grain thinning, realize the raising of low-temperature impact toughness by reducing ductile-brittle transition temperature.
The beneficial effect that adopts technique scheme to produce is: crystal grain of the present invention is tiny, even, and ductile-brittle transition temperature is lower, has the higher strength of materials and toughness.The present invention does not add other noble metals and thermal treatment cost is lower, has the advantages that production cost is low, use cost is low.
The inventive method is by adjusting heating, finish rolling and laying temperature, and speed of cooling, controls its austenitizing degree and transformation temperature, by improving product grains degree, reduces ductile-brittle transition temperature, improves the low-temperature impact toughness of product.The present invention is without increase equipment and investment, do not increase production cost, make full use of existing installation and technique, according to the requirement of the low-temperature impact toughness of downstream manufacturing concern, adopt reasonable controlled rolling, process for cooling to realize the high strength steel wire rod with favorable low-temperature impact toughness.
The present invention, by controlled rolling and process for cooling, improves and has stablized product low-temperature impact toughness, under the iron and steel situation that the situation is tense, is enterprise's Strategies of Promoting status, constantly occupies high-end customer guarantee is provided.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is that the embodiment of the present invention 1 products obtained therefrom is organized grain fineness number microgram;
Fig. 2 is that the embodiment of the present invention 3 products obtained therefroms are organized grain fineness number microgram;
Fig. 3 is that the embodiment of the present invention 5 products obtained therefroms are organized grain fineness number microgram.
Embodiment
Embodiment 1: the high-strength steel wire originally with favorable low-temperature impact toughness adopts following production method.
(1) smelting and continuous casting working procedure: smelting molten steel continuous casting become steel billet, and its composition is by weight percentage: C 0.35%, Si 0.19%, Mn 0.83%, P 0.020%, S 0.020%, Cr 0.94%, Mo 0.19%, all the other are iron.
(2) heating process: by heating steel billet to 1000 DEG C, soaking time 120min.
(3) rolling process and the operation of weaving silk: the steel billet after dephosphorization is carried out to 6+8 passage and roll in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling, enter 875 DEG C of final rolling temperatures, and four subtract sizing; After finish rolling finishes, laying temperature is controlled at 850 DEG C.
(4) refrigerating work procedure: enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 1.0 DEG C/s.
Embodiment 2: the high-strength steel wire originally with favorable low-temperature impact toughness adopts following production method.
(1) smelting and continuous casting working procedure: smelting molten steel continuous casting become steel billet, and its composition is by weight percentage: C 0.38%, Si 0.20%, Mn 0.85%, P 0.018%, S 0.020%, Cr 0.95%, Mo 0.20%, all the other are iron.
(2) heating process: by heating steel billet to 1050 DEG C, soaking time 115min.
(3) rolling process and the operation of weaving silk: the steel billet after dephosphorization is carried out to 6+8 passage and roll in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling, enter 873 DEG C of final rolling temperatures, and four subtract sizing, and after finish rolling finishes, laying temperature is controlled at 840 DEG C.
(4) refrigerating work procedure: enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 0.8 DEG C/s.
Embodiment 3: the high-strength steel wire originally with favorable low-temperature impact toughness adopts following production method.
(1) smelting and continuous casting working procedure: smelting molten steel continuous casting become steel billet, and its composition is by weight percentage: C 0.42%, Si 0.19%, Mn 0.84%, P 0.020%, S 0.018%, Cr 0.93%, Mo 0.19%, all the other are iron.
(2) heating process: by heating steel billet to 1100 DEG C, soaking time 110min.
(3) rolling process and the operation of weaving silk: the steel billet after dephosphorization is carried out to 6+8 passage and roll in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling, enter 880 DEG C of final rolling temperatures, and four subtract sizing, and after finish rolling finishes, laying temperature is controlled at 845 DEG C.
(4) refrigerating work procedure: enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 1.2 DEG C/s.
Embodiment 4: the high-strength steel wire originally with favorable low-temperature impact toughness adopts following production method.
(1) smelting and continuous casting working procedure: smelting molten steel continuous casting become steel billet, and its composition is by weight percentage: C 0.45%, Si 0.20%, Mn 0.86%, P 0.019%, S 0.019%, Cr 0.94%, Mo 0.21%, all the other are iron.
(2) heating process: by heating steel billet to 1050 DEG C, soaking time 110min.
(3) rolling process and the operation of weaving silk: the steel billet after dephosphorization is carried out to 6+8 passage and roll in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling, enter 870 DEG C of final rolling temperatures, and four subtract sizing, and after finish rolling finishes, laying temperature is controlled at 840 DEG C.
(4) refrigerating work procedure: enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 0.9 DEG C/s.
Embodiment 5: the high-strength steel wire originally with favorable low-temperature impact toughness adopts following production method.
(1) smelting and continuous casting working procedure: smelting molten steel continuous casting become steel billet, and its composition is by weight percentage: C 0.30%, Si 0.40%, Mn 0.70%, P 0.016%, S 0.018%, Cr 1.20%, Mo 0.10%, all the other are iron.
(2) heating process: by heating steel billet to 1080 DEG C, soaking time 70min.
(3) rolling process and the operation of weaving silk: the steel billet after dephosphorization is carried out to 6+8 passage and roll in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling, enter 850 DEG C of final rolling temperatures, and four subtract sizing, and after finish rolling finishes, laying temperature is controlled at 800 DEG C.
(4) refrigerating work procedure: enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 0.5 DEG C/s.
Embodiment 6: the high-strength steel wire originally with favorable low-temperature impact toughness adopts following production method.
(1) smelting and continuous casting working procedure: smelting molten steel continuous casting become steel billet, and its composition is by weight percentage: C 0.50%, Si 0.10%, Mn 1.00%, P 0.017%, S 0.015%, Cr 0.70%, Mo 0.30%, all the other are iron.
(2) heating process: by heating steel billet to 1020 DEG C, soaking time 130min.
(3) rolling process and the operation of weaving silk: the steel billet after dephosphorization is carried out to 6+8 passage and roll in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling, enter 900 DEG C of final rolling temperatures, and four subtract sizing, and after finish rolling finishes, laying temperature is controlled at 820 DEG C.
(4) refrigerating work procedure: enter Stelmor cooling line, regulate air-cooled line stay-warm case to open quantity and blower fan aperture, after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 1.5 DEG C/s.
Product performance detect: Fig. 1 is that embodiment 1 products obtained therefrom is organized grain fineness number microgram; Fig. 2 is that embodiment 3 products obtained therefroms are organized grain fineness number microgram; Fig. 3 is that embodiment 5 products obtained therefroms are organized grain fineness number microgram; From Fig. 1-Fig. 3, its crystal grain is tiny, even, can effectively improve the strength of materials, increase toughness of material.
Embodiment 1-6 gained Φ 20mm wire rods carry out, after conventional thermal treatment, being processed as 10*7.5*55 v-notch, and the ASTM A370-0 method of adopting international standards, carries out shock test at-101 DEG C, and inspection numerical value is as table 1.
The Impact Properties of Materials test result of table 1: embodiment 1-6
Claims (6)
1. one kind has the high-strength steel wire of favorable low-temperature impact toughness, it is characterized in that, the weight percentage of its steel grades is: C 0.30%～0.50%, Si 0.10%～0.40%, Mn 0.70%～1.00%, P≤0.020%, S≤0.020%, Cr 0.70%～1.20%, Mo 0.10%～0.30%, surplus is Fe and trace impurity.
2. the high-strength steel wire with favorable low-temperature impact toughness according to claim 1, is characterized in that: described wire rod is 28J～40J at the ballistic work of-101 DEG C.
3. a production method with the high-strength steel wire of favorable low-temperature impact toughness, is characterized in that: it comprises smelts and continuous casting working procedure, heating process, rolling process, the operation of weaving silk and refrigerating work procedure; The weight percent of described smelting and continuous casting working procedure gained steel billet composition is: C 0.30%～0.50%, Si 0.10%～0.40%, Mn 0.70%～1.00%, P≤0.020%, S≤0.020%, Cr 0.70%～1.20%, Mo 0.10%～0.30%, surplus is Fe and trace impurity.
4. the production method of the high-strength steel wire with favorable low-temperature impact toughness according to claim 3, is characterized in that, described heating process: by heating steel billet to 1000～1100 DEG C, and insulation;
Described rolling process: roll and finish rolling during steel billet is carried out slightly; Entering final rolling temperature is 850～900 DEG C;
The described operation of weaving silk: laying temperature is controlled at 800～850 DEG C;
Described refrigerating work procedure: after weaving silk, wire rod phase transformation leading portion rate of cooling is controlled at 0.5～1.5 DEG C/s.
5. the production method of the high-strength steel wire with favorable low-temperature impact toughness according to claim 4, is characterized in that: the soaking time in described heating process is 70～130min.
6. according to the production method of the high-strength steel wire with favorable low-temperature impact toughness described in claim 4 or 5, it is characterized in that: in described rolling process, steel billet carries out 6+8 passage and rolls in thick, the pre-finish rolling of 4 passage, 8 passage finish rolling.
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| CN201410180818.6A CN103952633B (en) | 2014-04-30 | 2014-04-30 | There is high-strength steel wire and the production method thereof of favorable low-temperature impact toughness |
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| CN104988409A (en) * | 2015-07-31 | 2015-10-21 | 邢台钢铁有限责任公司 | Non-annealed cold forging steel hot-rolled wire rod and production method thereof |
| CN105149878A (en) * | 2015-09-08 | 2015-12-16 | 南京钢铁股份有限公司 | Production technology of high-alloy tool steel wire rod |
| CN105925909A (en) * | 2016-06-24 | 2016-09-07 | 邢台钢铁有限责任公司 | Bearing steel wire rod and production method thereof |
| CN106086652A (en) * | 2016-08-04 | 2016-11-09 | 邢台钢铁有限责任公司 | High strength heat resistant the cold heading steel and production method thereof |
| CN106282788A (en) * | 2016-08-10 | 2017-01-04 | 邢台钢铁有限责任公司 | A kind of piston rod wire rod and production method thereof |
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| CN104988409A (en) * | 2015-07-31 | 2015-10-21 | 邢台钢铁有限责任公司 | Non-annealed cold forging steel hot-rolled wire rod and production method thereof |
| CN105149878A (en) * | 2015-09-08 | 2015-12-16 | 南京钢铁股份有限公司 | Production technology of high-alloy tool steel wire rod |
| CN105925909A (en) * | 2016-06-24 | 2016-09-07 | 邢台钢铁有限责任公司 | Bearing steel wire rod and production method thereof |
| CN106086652A (en) * | 2016-08-04 | 2016-11-09 | 邢台钢铁有限责任公司 | High strength heat resistant the cold heading steel and production method thereof |
| CN106282788A (en) * | 2016-08-10 | 2017-01-04 | 邢台钢铁有限责任公司 | A kind of piston rod wire rod and production method thereof |
| CN107058880B (en) * | 2017-03-28 | 2018-10-23 | 邢台钢铁有限责任公司 | A kind of automobile daming piston bar steel and its production method |
| CN107058880A (en) * | 2017-03-28 | 2017-08-18 | 邢台钢铁有限责任公司 | A kind of automobile daming piston bar steel and its production method |
| CN107254635A (en) * | 2017-06-26 | 2017-10-17 | 邢台钢铁有限责任公司 | It is a kind of to exempt from annealed alloy steel wire rod and its production method with excellent drawing property |
| CN107254635B (en) * | 2017-06-26 | 2019-02-19 | 邢台钢铁有限责任公司 | It is a kind of to exempt from annealed alloy steel wire rod and its production method with excellent drawing property |
| CN107881423A (en) * | 2017-12-27 | 2018-04-06 | 南京宝日钢丝制品有限公司 | The method of cold-forging steel and preparation method with preparing steel wire using the cold-forging steel |
| CN108330391A (en) * | 2018-02-13 | 2018-07-27 | 鞍钢股份有限公司 | A kind of chrome molybdenum the cold heading steel and its production method |
| CN108330391B (en) * | 2018-02-13 | 2020-07-17 | 鞍钢股份有限公司 | Chromium-molybdenum alloy cold heading steel wire rod and production method thereof |
| CN109518076A (en) * | 2018-11-08 | 2019-03-26 | 邢台钢铁有限责任公司 | A kind of engine cranking motor axle-steel wire rod and its production method |
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