CN100579680C - Method for producing high-intensity fine rolling screwed reinforcement - Google Patents
Method for producing high-intensity fine rolling screwed reinforcement Download PDFInfo
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- CN100579680C CN100579680C CN200710118997A CN200710118997A CN100579680C CN 100579680 C CN100579680 C CN 100579680C CN 200710118997 A CN200710118997 A CN 200710118997A CN 200710118997 A CN200710118997 A CN 200710118997A CN 100579680 C CN100579680 C CN 100579680C
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Abstract
The invention relates to a production method of high strength finish rolled rebar. The billet material is medium-carbon low-alloy steel, the technical process includes: converter smelting-steel-clad vanadium micro alloying-LF refining-whole-phase protection casting-billet checking-furnace heating-controlled rolling-controlled cooling after rolling, wherein, the continuous casting process adopts 130mm<2> small square billet whole-phase protection casting; the initial rolling temperature in the rolling process is 950 to 1100 degrees centigrade; the temperature of the precision rolling feed port is 800 to 950 degrees centigrade; after the rolling, two-stage or three-segment gradual controlled cooling is adopted, wherein, the temperature of the first tapping cooling segment is controlled between 700 and 850 degrees centigrade, the tempering temperature of the cooling bed of the second and the third tapping cooling segments is controlled between 600 and 700 degrees centigrade, and the temperature of the PSB830 is controlled between 570 to 670 degrees centigrade. Through adopting the method and 130 continuous casting billet, high strength finish rolled rebar of brilliant performance was first produced in one heat in China.
Description
Technical field
The present invention relates to a kind of production method of high-strength finish rolling deformed bar, be specially adapted to roll the method that the online Heat Treatment technology one-heating forming in back is produced high strength cast iron.
Background technology
High-strength finish rolling deformed bar is mainly used in highway, bridge, slope anchorage etc., mainly comprises four strength grades, and the trade mark is respectively: PSB785, PSB830, PSB930, PSB1080.The traditional handicraft of producing high-strength finish rolling deformed bar at present is: modified heat treatment or bloom two pyrogene material technologies, and these two kinds of explained hereafter high-strength finish rolling deformed bar operations are many, and lumber recovery is low, the production cost height.
Summary of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of employing 130mm
2The production method of the high-strength finish rolling deformed bar of little square billet one-heating forming technology adopts this method can reduce production process, reduces production costs, and improves cost performance.
The technical solution adopted in the present invention is: the steel billet chemical analysis of employing is by weight percentage: C:0.36-0.46%, Si:1.4-1.8%, Mn:0.7-1.0%, V:0.08-0.15%, P≤0.045%, S≤0.045%, niobium+titanium＜0.10%, surplus are Fe, technological process is a converter smelting, the ladle vanadium micro-alloying, the LF refining, the full guard casting, steel billet inspection, heating furnace heating, back control cooling is rolled in controlled rolling; Casting process adopts 130mm
2Little square billet full guard casting, casting cycle 40-60min/ stove, 20-35 ℃ of the tundish molten steel target degree of superheat, pulling rate is controlled according to 2.0-2.4m/min, tundish liquid steel level height 600-800mm, two cold specific waters press the control of 0.8-1.2L/kg steel, control continuous casting billet shrinkage cavity rank≤1.5 grades; 950-1100 ℃ of controlled rolling start rolling temperature, 800-950 ℃ of finish rolling inlet temperature; Roll the back and adopt the two-part or the syllogic grading control type of cooling, go out one cold section temperature and be controlled between 700～850 ℃, go out secondary cooling zone or three cold sections and go up cold bed temperature PSB785 and be controlled between 600-700 ℃, PSB830 is controlled at 570-670 ℃.
Key problem in technology of the present invention mainly contains following 3 points, and 1, little square billet macrostructure control; 2, solve little square billet high strength and good contradiction of extending between the plasticity; 3, improve reinforcing bar poker characteristic stability.The measure of taking is control continuous casting billet shrinkage cavity≤1.5 grades; By V microalloying crystal grain thinning, and roll back control cooling and promptly carry out surface hardening by rolling back water-cooled line, utilize heart portion waste heat on cold bed, to carry out the online Heat Treatment technology of self tempering, the surface peening tissue that obtains suitable thickness is tempered structure and the good pearlite+ferritic structure of heart portion plasticity, guarantees that reinforcing bar obtains the high-intensity good extension plasticity that has simultaneously; By rolling back secondary to three grade cooling, and the weak cold pattern of control in strong back before suitably taking according to appointed condition, and rationally control the ratio of rolling back rollgang speed and mill speed, the temperature difference at cold bed afterbody and head, middle part on the reduction reinforcing bar, the fluctuation of minimizing poker characteristic.
Adopt beneficial effect of the present invention:
(1) one-heating forming adopts 130mm first
2Continuous casting square billet is produced PSB785 and PSB830 high-strength finish rolling deformed bar;
(2) continuous casting billet shrinkage cavity≤1.5 grade are for one-heating forming has been created condition;
(3) by V microalloying+controlled rolling crystal grain thinning, the matrix prior austenite grain size reaches the 8.5-10 level, plays remarkable effect to improving yield strength and percentage elongation;
(4) by reasonable coupling mill speed with roll back roller-way transporting velocity, the cold bed tempering temperature difference has guaranteed the stability of performance on the control reinforcing bar poker in 50 ℃;
(5) product specification is φ 25～φ 40mm, and the PSB785 performance satisfies σ s 〉=785MPa, σ b 〉=980MPa, and δ 5 〉=7%; The PSB830 performance satisfies σ s 〉=830MPa, σ b 〉=1030MPa, and δ 5 〉=6%.
The specific embodiment
Molten steel composition C:0.14%, Si:1.52%, Mn:0.76%, V:0.10%, P:0.018%, S:0.01%, Ti:0.01%; The cast of employing full guard, crystallizer adopts electromagnetic agitation; By 6 stream tissue cast, casting cycle 45min/ stove; 30 ± 5 ℃ of the tundish molten steel target degrees of superheat; Pulling rate is controlled according to 2.1-2.3m/min, average 2.2m/min; Tundish liquid steel level height 600-700mm; Two cold specific water 1.0L/kg steel; Start rolling temperature is at 950-1100 ℃, and the finishing mill inlet temperature is controlled at 800-950 ℃; Roll the back and adopt two-stage control cooling, a cold back temperature is controlled at 700-800 ℃, goes out that cold bed temperature PSB785 is controlled between 600-700 ℃ on the secondary cooling zone, and PSB830 is controlled at 570-670 ℃; Because it is cold for the waterpower conveying-type that back two is rolled by section bar factory, go up cold bed smoothly in order to guarantee reinforcing bar, roll back roller-way transporting velocity than mill speed height, cause stocking to pass the closer to afterbody that to roll two cold times of back short more, last cold bed temperature is high more, and intensity is low more, in order to reduce the fluctuation of reinforcing bar poker characteristic, roll back roller-way transporting velocity and under the condition of cold bed in the assurance, take off limit value, rationally mate with mill speed.
The high-strength finish rolling deformed bar stable mechanical property that adopts the present invention to produce, through the check of iron and steel industry product quality supervision and inspection station, Beijing, intensity rank has reached the 830/1030MPa level, and assay sees the following form.
Claims (1)
1, a kind of production method of high-strength finish rolling deformed bar; the steel billet chemical analysis that adopts is by weight percentage: C:0.36-0.46%, Si:1.4-1.8%, Mn:0.7-1.0%, V:0.08-0.15%, P≤0.045%, S≤0.045%, niobium+titanium＜0.10%, surplus are Fe; technological process is a converter smelting; the ladle vanadium micro-alloying; the LF refining; the full guard casting; steel billet is checked; the heating furnace heating; controlled rolling; roll back control cooling, it is characterized in that: casting process adopts 130mm
2Little square billet full guard casting, casting cycle 40-60min/ stove, 20-35 ℃ of the tundish molten steel target degree of superheat, pulling rate is controlled according to 2.0-2.4m/min, tundish liquid steel level height 600-800mm, two cold specific waters press the control of 0.8-1.2L/kg steel, control continuous casting billet shrinkage cavity rank≤1.5 grades; 950-1100 ℃ of controlled rolling start rolling temperature, 800-950 ℃ of finish rolling inlet temperature; Roll the back and adopt the two-part or the syllogic grading control type of cooling, go out one cold section temperature and be controlled between 700～850 ℃, go out secondary cooling zone or three cold sections and go up cold bed temperature PSB785 and be controlled between 600-700 ℃, PSB830 is controlled at 570-670 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710118997A CN100579680C (en) | 2007-06-18 | 2007-06-18 | Method for producing high-intensity fine rolling screwed reinforcement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710118997A CN100579680C (en) | 2007-06-18 | 2007-06-18 | Method for producing high-intensity fine rolling screwed reinforcement |
Publications (2)
| Publication Number | Publication Date |
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| CN101327491A CN101327491A (en) | 2008-12-24 |
| CN100579680C true CN100579680C (en) | 2010-01-13 |
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| CN101906503B (en) * | 2010-07-15 | 2012-05-09 | 首钢总公司 | Method for producing high-specification ultrahigh-obdurability aging-free railway basic construction steel |
| CN102115847A (en) * | 2010-12-30 | 2011-07-06 | 唐山国丰钢铁有限公司 | Production process of IV grade deformed steel bars |
| CN102172816B (en) * | 2011-01-14 | 2013-02-20 | 冷水江钢铁有限责任公司 | Method for producing high-strength hot rolling valve snail |
| CN102560248A (en) * | 2012-01-31 | 2012-07-11 | 首钢总公司 | Method for producing bolt steel |
| CN103103437A (en) * | 2013-02-01 | 2013-05-15 | 首钢水城钢铁（集团）有限责任公司 | Method for producing HRBF400E fine-grain aseismic reinforcement |
| CN103205628A (en) * | 2013-04-26 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Production method of HRB400 (Rockwell Hardness) deformed steel bar |
| CN104532127B (en) * | 2014-12-24 | 2017-01-11 | 首钢总公司 | Method for producing steel for pipe fittings and steel for pipe fittings |
| CN105296853B (en) * | 2015-11-30 | 2017-07-04 | 石横特钢集团有限公司 | A kind of 930MPa high-intensity fine rollings screw-thread steel and its preparation technology |
| CN106350733A (en) * | 2016-09-19 | 2017-01-25 | 石横特钢集团有限公司 | PSB1080 finish-rolled threaded bar and production process thereof |
| CN106399848A (en) * | 2016-09-19 | 2017-02-15 | 石横特钢集团有限公司 | High-toughness MG500 anchor rod reinforcing steel bar and production method thereof |
| CN107377632B (en) * | 2017-08-11 | 2020-03-27 | 张家港联峰钢铁研究所有限公司 | Temperature control system for reducing head-tail size difference of reinforcing steel bars and operation method |
| CN110293212B (en) * | 2019-07-25 | 2020-12-01 | 中冶赛迪工程技术股份有限公司 | Method for controlling secondary cooling water amount in continuous casting of small square billets under high drawing speed condition |
| CN110760757B (en) * | 2019-08-14 | 2021-12-03 | 钢铁研究总院 | Low-cost strengthening process of hot-rolled steel bar |
| CN111041367B (en) * | 2019-12-26 | 2021-06-04 | 芜湖新兴铸管有限责任公司 | Method for preventing carbon high-silicon low-manganese steel from flocculating in billet |
| CN112195394B (en) * | 2020-09-01 | 2022-02-18 | 陕钢集团产业创新研究院有限公司 | MG600 grade anchor rod steel with yield ratio less than or equal to 0.8 and production method thereof |
| CN112410669A (en) * | 2020-11-18 | 2021-02-26 | 江苏永钢集团有限公司 | Corrosion-resistant PSB830 finish-rolled deformed steel bar and production process thereof |
| CN112322985A (en) * | 2020-11-18 | 2021-02-05 | 江苏永钢集团有限公司 | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof |
| CN113755764A (en) * | 2021-07-30 | 2021-12-07 | 江苏鸿泰钢铁有限公司 | Anti-seismic twisted steel based on crystal optimization and production process thereof |
| CN115261721B (en) * | 2022-07-26 | 2023-08-11 | 陕钢集团产业创新研究院有限公司 | Long casting time PSB830 finish rolling deformed steel bar and production method thereof |
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- 2007-06-18 CN CN200710118997A patent/CN100579680C/en active Active
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| CN101327491A (en) | 2008-12-24 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |