CN103627951B - High tenacity boracic carbon structural steels coiled sheet and production method thereof - Google Patents
High tenacity boracic carbon structural steels coiled sheet and production method thereof Download PDFInfo
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- CN103627951B CN103627951B CN201310655113.0A CN201310655113A CN103627951B CN 103627951 B CN103627951 B CN 103627951B CN 201310655113 A CN201310655113 A CN 201310655113A CN 103627951 B CN103627951 B CN 103627951B
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Abstract
The present invention relates to a kind of high tenacity boracic carbon structural steels coiled sheet and production method thereof, carbon≤0.30% is contained according to weight, silicon :≤0.50%, manganese :≤1.70%, phosphorus :≤0.035%, sulfur :≤0.035%, aluminum: 0.015~0.050%, and the boron of 8~50ppm, surplus is ferrum and trace impurity.Existing the yield strength 215~345MPa rank carbon structural steels with Q235, SS400 as representative and the extension property of low-alloy steel, room temperature and low-temperature impact toughness is improved by boron micro-alloyed, microstructure homogenization.
Description
Technical field
The present invention relates to carbon structural steels and low-alloy steel, be specifically related to a kind of high tenacity boracic carbon structural steels coiled sheet and production thereof
Method.
Background technology
It is to use general carbon manganese composition design that current each steel mill produces Q235 carbon structural steels coiled sheet.Common problem be
20~25.4mm thickness ranges are easily generated and extend and the problem of strength character deficiency, it is impossible to fully meet the requirement of GB/T700;Right
It is that sheet material microscopic structure ' ferrite+a small amount of pearlite ' taeniae telarum occurs in other finger gauge panels or the simultaneous problem of coiled sheet
Shape is distributed, and is easily generated stretching fracture layering and impact fracture is layered, and the anisotropy of material property.
Summary of the invention
It is an object of the invention to provide a kind of high tenacity boracic carbon structural steels coiled sheet and production method thereof, pass through boron microalloy
Change, microstructure homogenization improves existing the yield strength 215~345MPa rank carbon structural steels with Q235, SS400 as representative
Extension property, room temperature and low-temperature impact toughness with low-alloy steel.
Concrete technical scheme is as follows:
High tenacity boracic carbon structural steels coiled sheet, contains carbon≤0.30% according to weight, silicon :≤0.50%, manganese :≤1.70%,
Phosphorus :≤0.035%, sulfur :≤0.035%, aluminum: 0.015~0.050%, and the boron of 8~50ppm, surplus is ferrum and trace
Impurity.
Further, also include niobium :≤0.050%, and/or, vanadium :≤0.050%, and/or, titanium :≤0.020%, and
/ or, nickel :≤0.40%, and/or, chromium≤0.50%, and/or, copper :≤0.40%.
The production method of above-mentioned high tenacity boracic carbon structural steels coiled sheet, comprises the steps:
(1) two frame reversable mill roughing are used;
(2) 7 frame hot continuous rollings are carried out;
(3) section cooling after rolling;
(4) batch.
Further, in austenite recrystallization district and Unhydrated cement multi-pass controlled rolling, including:
1180~1220 DEG C of heating;
Breaking down open rolling at 1150~1180 DEG C;
Finish rolling open rolling at 1000 DEG C~950 DEG C;
Finish rolling finish to gauge at 900 DEG C~800 DEG C;
Roll rear section cooling or ultra-rapid cooling;
650 DEG C~500 DEG C terminate cooling and batch.
Further, described cooling uses water curtain section cooling.
Further, water-cooled speed 10 DEG C~50 DEG C/S.
Compared with currently available technology, after the mode of the present invention is improved, add 8~50ppm boron elements, and adjust hot rolling
After cooling technological parameter, the mechanical property of more than 20mm think gauge carbon structural steels and low-alloy steel is made to meet GB/T700
Requirement, it is to avoid the generation of drawbacks described above.Simultaneously, it is ensured that coiled sheet is opened after putting down, the parallel and vertical direction along rolling direction
The service check result of tensile sample do not decline.Boron element has been widely used for high-strength steel sheet and mild steel strip product
In, carbon aluminium-killed steel strip as cold rolling in continuous annealing, very thin hot rolling drawing steel plate, high tensile pipeline steel and non-orientation silicon steel etc.;
But the application in carbon structural steels and low-alloy steel is the most rare.Trace B is applied to carbon structural steels and low conjunction by Ma Gang
Jin Gangzhong, achieves preferable effect.Make the mechanical property of carbon structural steels including 20.0~25.4mm thickness specifications
Not only conform with the requirement of GB/T700, it is to avoid extension property is not enough, strength character is not enough, banded structure and stretching or punching
Strike off the generation of the drawbacks described above such as mouth layering, moreover, it is also possible to obtain tough considerably beyond average room temperature and low-temperature impact
Property, excellent isotropic performance.
1) process according to the measure of the present invention, make carbon structural steels coiled sheet have good low-temperature impact toughness.
2) processing according to the measure of the present invention, the tissue making carbon structural steels and low-alloy steel coiled sheet is highly uniform, without preferentially taking
To, it is layered without fracture.
3), after coiled sheet is opened and put down, vertical mixing coefficient does not declines.
Accompanying drawing explanation
The metallographic structure (with rolling direction vertical direction) of Fig. 1 industrial boracic carbon structural steels
The metallographic structure (along rolling direction parallel direction) of Fig. 2 industrial boracic carbon structural steels
Detailed description of the invention
Describing the present invention below according to accompanying drawing, it is a kind of preferred embodiment in numerous embodiments of the present invention.
Design of Chemical Composition that the present embodiment is used and rolling mill practice, cooling technique be applied to current GB700, JIS G3101,
The carbon structural steels of yield strength 200-420MPa of the standard criterions such as JIS G3109 and low-alloy steel, can significantly improve tissue
With the uniformity of performance, improve toughness and levels of ductility.
To this end, scheme is characterized by: first, carbon content is less than 0.30%, and the Ultra-low carbon less than 0.06% can be used to design, also
Ultra-low carbon design can not be used to use higher than 0.06%, until the carbon content design of the highest 0.30%, still can obtain uniformly
Microscopic structure, to avoid banded structure and stretching fracture, the layering of impact fracture;Second, can use interpolation Nb, V,
The elements such as Ti carry out microalloying design, it is also possible to do not use the elements such as Nb, V, Ti to carry out microalloying and design to improve surrender
Intensity 200-420MPa rank carbon structural steels and the room temperature of low-alloy steel and low-temperature impact toughness;3rd, design rolling, cooling
Technique, the method such as comprehensive microalloying, solution strengthening and build up, it is thus achieved that the heterogeneous structure based on acicular ferrite, or
Person obtains ' polygonal ferrite+quasi-polygonal ferrite+a small amount of pearlite ' and, to improve intensity, plasticity and extension property, adapts to
Need from the diversified performance of 200MPa to 420MPa difference yield strength grade, 25.4mm and following different-thickness hot-rolled sheet coil
Ask.
High tenacity boracic carbon structural steels and low-alloy steel coiled sheet Design of Chemical Composition be:
Carbon≤0.30%;Silicon :≤0.50%;Manganese :≤1.70%;Phosphorus :≤0.035%;Sulfur :≤0.035%;Aluminum:
0.015~0.050%;Boron: 8~50ppm.
Require can select to add or can select to be added without following elements according to different properties: niobium :≤0.050%;Vanadium:
≤ 0.050%;Titanium :≤0.020%;Nickel :≤0.40%;Chromium≤0.50%;Copper :≤0.40%.
Ferrum and trace impurity: surplus.
The cooling controlling and rolling controlling process system of high tenacity boracic carbon structural steels and low-alloy steel coiled sheet is:
1. rolling pass distribution: use two frame reversable mill roughing, carry out 7 frame hot continuous rollings, layer after finally rolling again
Stream cools down, batches.In austenite recrystallization district and Unhydrated cement multi-pass controlled rolling, (1180~1220 DEG C) heating-
(1150~1180) DEG C breaking down open rolling-(1000 DEG C~950 DEG C) finish rolling open rolling-(900 DEG C~800 DEG C) finish rolling finish to gauge-roll
Rear section cooling or ultra-rapid cooling-(650 DEG C~500 DEG C) terminate cooling and batch.
2. the type of cooling: water curtain section cooling, water-cooled 10 DEG C~50 DEG C/S.
The foundation of the TMCP process system of high tenacity boracic carbon structural steels and low-alloy steel coiled sheet is:
Thermo-mechanical rolling (TMCP) is based on the metallurgical technology such as recrystallization, phase transformation, makes as-rolled condition plate property reach
Goodization.For economizing on resources, reduce the addition of alloying element, optimize carbon structural steels and low-alloy steel coiled sheet microscopic structure, keep away
Exempt from banded structure, fracture lamination defect, it is thus achieved that high-caliber toughness, and intensity and the Proper Match of toughness, the present invention is abundant
Play rolling power and the roller repairing ability of seven frame hot tandem, and combine with boron micro-alloyed design, pass through high temperature
Austenitic area Deformation recrystallization, the deformation of low temperature austenite Unhydrated cement and the cooling of the acceleration after rolling obtain expection and optimize aobvious
Micro-assembly robot and the target of mechanical property.
Trace B has segregation effect on austenite grain boundary, can suppress ferritic forming core, make C curve move to right, suppression pearlite
Change.Its mechanism of action is: (1) boron segregation, at austenite grain boundary, reduces crystal boundary energy and decreases the position of the preferential forming core of ferrite
Put.(2) boron reduces ferrum self-propagating coefficient on crystal boundary, reduces ferritic core forming speed.(3) boron segregation is after crystal boundary,
Occupy the position of preferential forming core.(4) form tiny boride and, adhesion coherent with matrix along crystal boundary, make ferrite be difficult to
Forming core on interface between boride and matrix.
Boron element has been widely used in high-strength steel sheet and mild steel strip product, and carbon aluminium-killed steel as cold rolling in continuous annealing is thin
Band, very thin hot rolling drawing steel plate, high tensile pipeline steel and non-orientation silicon steel etc.;But answering in carbon structural steels and low-alloy steel
With the most rare.Trace B is applied in carbon structural steels and low-alloy steel by patent of the present invention, when using acicular ferrite structure
Or ' polygonal ferrite+quasi-polygonal ferrite+a small amount of pearlite ', and it is common to make crystal grain refinement can compare with structural homogenity
The high tenacity boracic carbon structural steels being not added with boron element and low-alloy steel coiled sheet or opening plate performance more excellent, the extensibility of material
Energy, room temperature and low-temperature impact toughness, microscopic structure banding degree all achieve comprehensively improvement.
In preferred embodiment, chemical composition is as shown in table 1.Compare with common SS400, add the boron element of 15~25ppm.
The chemical composition (smelting component) of table 1 SS400 requires (%)
The major parameter of hot rolling technology is as shown in table 2.
Temperature parameter scheme manufactured experimently by table 2
Trial-production temperature parameter | Trial-production design |
Tapping temperature | 1200℃ |
Finish rolling F1 entrance target temperature | FET≤1050℃ |
Intermediate blank target thickness | 60mm |
Finishing temperature | 880±15℃ |
Coiling temperature | 620±15℃ |
After production testing, the mechanical property of coiled sheet is as shown in table 3.Corresponding to coiled sheet opening plate mechanical property as shown in table 4,
Impact property is as shown in table 5.
The vertical mixing coefficient of table 3 SS400 hot rolled coil
The vertical mixing coefficient of table 4 SS400 opening plate
The impact property of table 5 SS400 opening plate
Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements and is not subject to the restrictions described above,
As long as have employed method design and the various improvement that carry out of technical scheme of the present invention, or the most improved directly apply to other occasion
, all within protection scope of the present invention.
Claims (1)
1. the production method of a high tenacity boracic carbon structural steels coiled sheet, it is characterised in that comprise the steps:
(1) two frame reversable mill roughing are used;
(2) 7 frame hot continuous rollings are carried out, in austenite recrystallization district and Unhydrated cement multi-pass controlled rolling, including:
Tapping temperature 1200 DEG C;Finish rolling F1 entrance target temperature FET≤1050 DEG C;Intermediate blank target thickness 60mm;Finishing temperature 880 ± 15 DEG C;
(3) water curtain section cooling after rolling, water-cooled speed 10 DEG C~50 DEG C/S;
(4) 620 ± 15 DEG C terminate cooling and also batch, and gained high tenacity boracic carbon structural steels coiled sheet is according to weight carbon containing: 0.12 ~ 0.2%, silicon: 0.2 ~ 0.5%, manganese: 0.4 ~ 0.8%, phosphorus :≤0.030%, sulfur :≤0.030%, aluminum: 0.015~
0.045%, the boron of nitrogen :≤80ppm and 12~25ppm, surplus is ferrum and trace impurity.
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CN105779888B (en) * | 2016-03-14 | 2017-09-29 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of hot rolling production method of carbon structural steels |
CN105543708A (en) * | 2016-03-14 | 2016-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Carbon structural steel and smelting method thereof |
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CN106011633B (en) * | 2016-07-21 | 2018-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of Q235 levels anti-seismic structure hot rolled strip and preparation method thereof |
CN109706404B (en) * | 2019-02-27 | 2020-06-23 | 山东钢铁股份有限公司 | Titanium-containing carbon steel and production method thereof |
CN111270140A (en) * | 2020-03-12 | 2020-06-12 | 本钢板材股份有限公司 | Production method for improving transverse crease defect of Q235B hot-rolled steel coil |
CN116334486A (en) * | 2023-03-22 | 2023-06-27 | 包头钢铁(集团)有限责任公司 | High-strength hot-rolled steel strip with excellent low-temperature impact toughness for automobile and manufacturing method thereof |
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