CN103233169B - The high strength thin specification steel plate that plate shape is excellent and production method thereof - Google Patents
The high strength thin specification steel plate that plate shape is excellent and production method thereof Download PDFInfo
- Publication number
- CN103233169B CN103233169B CN201310157455.XA CN201310157455A CN103233169B CN 103233169 B CN103233169 B CN 103233169B CN 201310157455 A CN201310157455 A CN 201310157455A CN 103233169 B CN103233169 B CN 103233169B
- Authority
- CN
- China
- Prior art keywords
- steel plate
- rolling
- temperature
- high strength
- controlling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses the high strength thin specification steel plate that a kind of plate shape is excellent, the chemical component weight per-cent of steel plate: C:0.10 ~ 0.20%, Si:0.10 ~ 0.30%, Mn:1.40 ~ 1.70%, Nb:0.02 ~ 0.06%, Ti:0.008 ~ 0.025%, Cr:0.20 ~ 0.40%, all the other are Fe and inevitable impurity, and its metallographic structure is ferrite+perlite, grain fineness number >=9.5 grade.Production method comprises converter smelting, continuous casting, heating, rolling and controls cold step, and the temperature of heating controls at 1150 ~ 1190 DEG C; Rolling is segmentation rolling, and at rough rolling step, control start rolling temperature and be not less than 1080 DEG C, the draft controlling passage is not less than 15%, and in the finish rolling stage, controlling start rolling temperature is 900 ~ 950 DEG C, controls finishing temperature at 760 ~ 800 DEG C; When controlling cold, controlled cooling model speed≤10 DEG C/S, the red temperature controlling steel plate is 500 ~ 600 DEG C; Air cooling is to room temperature.The present invention achieves high strength, high tenacity on thin specification steel plate, and the combination of the performance such as low roughness, and production process is simple, does not need to heat-treat, improves productive rate.
Description
Technical field
The present invention relates to field of ferrous metallurgy materials, refer to the high strength thin specification steel plate that a kind of plate shape is excellent and production method thereof particularly.
Background technology
There is plate shape and all less-than-ideal problem of intensity of steel plate in the thin specification steel plate of Heavy Plate Production always.For ensureing intensity and the impelling strength of steel plate, the speed of cooling general requirement of steel plate is very fast, and the steel plate obtained in the case is the steel plate of troostite+ferrite or bainite+ferritic structure form, and the plate of steel plate describes and easily occurs that wooden dipper is bent; Or in order to ensure the plate shape of steel plate, reducing the speed of cooling of steel plate, obtaining the steel plate that microstructure is perlite+ferritic structure form, but the intensity of steel plate generally can only reach about 420MPa, be difficult to surmount 450MPa, in addition, the impelling strength of steel plate is also poor; Utilize low temperature rolling or ultralow-carbon method can reach good plate property, but low temperature rolling not too easily control, and the slab of smelting ultralow-carbon can cause the increase of smelting cost for the plate shape of the steel plate of Thin Specs.
Therefore, how to ensure that under the prerequisite that plate shape is excellent, the thin specification steel plate producing high strength and high tenacity just becomes problem demanding prompt solution.
Summary of the invention
The object of the invention is to provide for the problems referred to above the high strength thin specification steel plate and production method thereof that a kind of plate shape is excellent.
For achieving the above object, the technical solution used in the present invention is: the high strength thin specification steel plate that a kind of plate shape is excellent, the chemical component weight per-cent of this steel plate is as follows: C:0.10 ~ 0.20%, Si:0.10 ~ 0.30%, Mn:1.40 ~ 1.70%, Nb:0.02 ~ 0.06%, Ti:0.008 ~ 0.025%, Cr:0.20 ~ 0.40%, all the other are Fe and inevitable impurity, and its metallographic structure is ferrite+perlite, grain fineness number >=9.5 grade.
Further, the chemical component weight per-cent of this steel plate is as follows: C:0.15 ~ 0.20%, Si:0.15 ~ 0.30%, Mn:1.50 ~ 1.70%, Nb:0.03 ~ 0.06%, Ti:0.015 ~ 0.025%, Cr:0.25 ~ 0.40%, all the other are Fe and inevitable impurity.
Again further, the chemical component weight per-cent of this steel plate is as follows: C:0.16 ~ 0.20%, Si:0.15 ~ 0.30%, Mn:1.60 ~ 1.70%, Nb:0.03 ~ 0.06%, Ti:0.018 ~ 0.025%, Cr:0.3 ~ 0.40%, all the other are Fe and inevitable impurity.
Preferably, the thickness≤15mm of described steel plate.
The production method of the high strength thin specification steel plate that above-mentioned plate shape is excellent, comprises converter smelting, continuous casting, heating, rolling and controls cold step, and the temperature of described heating controls at 1150 ~ 1190 DEG C; Described rolling is segmentation rolling, and at rough rolling step, control start rolling temperature and be not less than 1080 DEG C, the draft controlling passage is not less than 15%, and in the finish rolling stage, controlling start rolling temperature is 900 ~ 950 DEG C, controls finishing temperature at 760 ~ 800 DEG C; When described control is cold, controlled cooling model speed≤10 DEG C/S, the red temperature controlling steel plate is 500 ~ 600 DEG C; Air cooling is to room temperature.
Preferably, at rough rolling step, controlling start rolling temperature is 1080 ~ 1200 DEG C, and the draft controlling passage is 15 ~ 30%.
Further preferably, when described control is cold, controlled cooling model speed is 5 ~ 8 DEG C/S, and the red temperature controlling steel plate is 550 ~ 600 DEG C.
Analytic explanation is carried out below with regard to chemical composition of the present invention and production method:
(1) chemical composition
C:C is the principal element determining hardness of steel, the form of carbide in steel and how many hardness and intensity determining steel.When C content is more than 0.20%, the low-temperature flexibility of steel significantly worsens, but C content is too low unfavorable to intensity again, the content target value of C is controlled, in 0.10 ~ 0.20% scope, both to have ensure that the intensity of steel, overcomes again the shortcoming that low-temperature flexibility is not good.
Mn:Mn can reduce the lower change point of steel, condensate depression, the refine pearlite tissue of increase austenite cooling and improve its mechanical property, and can significantly improve the hardening capacity of steel, but when Mn content is higher, has the unfavorable trend making crystalline grain of steel alligatoring and increase temper brittleness.Therefore, the content target value of Mn controls 1.40 ~ 1.70% by the present invention.
Si:Si is conventional reductor, there is admittedly molten strengthening effect, hardening capacity and temper resistance can be improved, be conducive to the elastic limit of raising steel and improve its over-all properties, increase steel solidity to corrosion under field conditions (factors), but when Si content is higher, reduce the toughness of steel, plasticity and ductility, easily cause cold short being unfavorable for be welded.Therefore, the content target value of Si controls 0.10 ~ 0.30% by the present invention.
Nb:Nb can significantly improve the austenite recrystallization temperature of steel, expand Unhydrated cement scope, realize strict Unhydrated cement rolling, promote the refinement of ferrite crystal grain, to play the effect improving intensity and toughness, Nb and C combines the carbide generated can hinder growing up of austenite crystal in the operation of rolling, has refined crystalline strengthening and precipitation strength effect significantly, but ferro-niobium belongs to precious alloy, when content increases, steel product cost will be increased.Therefore, the content target value of Nb controls 0.02 ~ 0.06% by the present invention.
The effect of Ti:Ti and Nb in steel is similar, Ti has stronger refined crystalline strengthening and precipitation strength effect, the Ti of trace can also at high temperature be combined with carbon, oxygen, form the precipitate of high temperature refractory, be conducive to the Austenite Grain Growth suppressing welded heat affecting zone, the remarkable toughness improving welded heat affecting zone, but chemical combination titanium reduces the hardening capacity of steel.Therefore, the content target value of Ti controls 0.008 ~ 0.025% by the present invention.
Cr:Cr can improve the hardening capacity of steel, and has certain admittedly molten strengthening effect, but content Gao Shiyi produces fragility, unfavorable to the welding property of steel.Therefore, the content target value of Cr controls 0.20 ~ 0.40% by the present invention.
(2) production method
In order to obtain high strength and ductility steel plate performance, crystal grain thinning becomes first-selected, and deformation-induced ferrite transformation (DIFT) and phase transformation strengthening ferrite transformation (DEET) are namely utilize Ultra-fine Grained to obtain higher intensity and good toughness.The rolling temperature of deformation-induced ferrite transformation (DIFT) and phase transformation strengthening ferrite transformation (DEET) is at the low-temperature range of austenite Unhydrated cement, namely between deformation-induced ferrite transformation temperature Ad3 and the transformation temperature Ar3 of undeformed austenite, therefore, its phase transformation mainly occurs in deformation process, instead of distortion after process of cooling in, and both almost synchronously carry out, so its distortion is all carry out in the two-phase region of reality.
As follows to key process technology parameter declaration of the present invention:
Controlling roughing start rolling temperature and be not less than 1080 DEG C, is to ensure that steel plate is at suitably high temperature, does not have larger resistance to deformation, avoids because temperature lower rolling load deficiency causes the draft of steel plate not enough; The draft controlling roughing passage is not less than 15%, being to ensure that steel plate is fully broken at recrystallize rolling zone crystal grain, laying foundation for finally obtaining thinner crystal grain; Controlling finish rolling stage start rolling temperature is 900 ~ 950 DEG C, and controls finishing temperature at 760 ~ 800 DEG C, is to ensure that steel plate is rolled at Unhydrated cement, thus crystal grain thinning; The red temperature controlling steel plate, at 500 ~ 600 DEG C, mainly ensures the plate shape of steel plate.
Beneficial effect of the present invention is: the present invention is by the mode crystal grain thinning such as composition proportion, optimization rolling technology condition, at a slow speed cooling of appropriate design steel, obtain grain fineness number>=9.5 grade, metallographic structure is perlite+ferritic thin specification steel plate, makes steel plate have high strength and high tenacity while ensureing steel-plate shape; Thin specification steel plate of the present invention, it is under the prerequisite of roughness≤7mm/1000mm ensureing steel-plate shape, and yield strength reaches more than 480MPa ,-20 DEG C of KV
2reach more than 150J; Composition of steel of the present invention is simple, its production process without the need to heat-treating, thus simplifies production process, improves productive rate, and reduces cost.
Figure of description
Fig. 1 is the metallographic structure schematic diagram of the steel plate that embodiment 2 is produced.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, but the present invention is not limited to following embodiment.Except as otherwise noted, the percentage ratio adopted in the present invention is weight percentage.
Table 1 lists the chemical component weight percentage ratio of the excellent high strength thin specification steel plate of plate shape in the embodiment of the present invention 1 ~ 8, and surplus is Fe and inevitable impurity.
Table 1
The production method of the high strength thin specification steel plate that plate shape described in above-described embodiment 1 ~ 8 is excellent is: converter smelting continuous casting becomes base; Strand is heated to 1150 ~ 1190 DEG C; Carry out segmentation rolling, in roughing section, control roughing start rolling temperature and be not less than 1080 DEG C, the draft controlling passage is not less than 15%, and finish rolling stage start rolling temperature is 900 ~ 950 DEG C, ensures that two-stage finishing temperature is at 760 ~ 800 DEG C; Steel plate rolling cools after completing, controlled cooling model speed≤10 DEG C/S, ensures that the red temperature of steel plate is 500 ~ 600 DEG C; Stand-by after air cooling to room temperature.
Yield strength (ReL), tensile strength (Rm), elongation (A50/%) ,-20 DEG C of impelling strength (-20 DEG C of KV are carried out to above-described embodiment 1 ~ 8 products obtained therefrom
2), grain grade, and the test of roughness, corresponding test result is in table 2:
Table 2
Can be found out by the data of table 2, the steel plate that embodiment 1 ~ 8 is produced, thickness≤15mm, yield strength reaches 482 more than MPa,-20 DEG C of KV2 reach 189 more than J, grain fineness number >=9.5 grade, roughness≤7mm/1000mm, wherein, the metallurgical structure of the high strength thin specification steel plate that the embodiment 2 plate shape of producing is excellent is shown in Fig. 1 (500 ×), and it is organized as perlite+ferrite, and grain fineness number is 10 grades, the steel plate of thickness specification≤15mm achieves high strength, high tenacity, and the combination of the performance such as low roughness.
Claims (3)
1. the high strength thin specification steel plate that a plate shape is excellent, it is characterized in that: the chemical component weight per-cent of this steel plate is as follows: C:0.15 ~ 0.20%, Si:0.15 ~ 0.30%, Mn:1.50 ~ 1.70%, Nb:0.03 ~ 0.06%, Ti:0.015 ~ 0.025%, Cr:0.25 ~ 0.40%, all the other are Fe and inevitable impurity, and its metallographic structure is ferrite+perlite, grain fineness number >=9.5 grade; Thickness≤the 15mm of described steel plate.
2. the high strength thin specification steel plate that plate shape according to claim 1 is excellent, it is characterized in that: the chemical component weight per-cent of this steel plate is as follows: C:0.16 ~ 0.20%, Si:0.15 ~ 0.30%, Mn:1.60 ~ 1.70%, Nb:0.03 ~ 0.06%, Ti:0.018 ~ 0.025%, Cr:0.3 ~ 0.40%, all the other are Fe and inevitable impurity.
3. a production method for the high strength thin specification steel plate that plate shape according to claim 1 is excellent, comprises converter smelting, continuous casting, heating, rolling and controls cold step, it is characterized in that: the temperature of described heating controls at 1150 ~ 1190 DEG C; Described rolling is segmentation rolling, and at rough rolling step, controlling start rolling temperature is 1080 ~ 1200 DEG C, and the draft controlling passage is 15 ~ 30%, and in the finish rolling stage, controlling start rolling temperature is 900 ~ 950 DEG C, controls finishing temperature at 760 ~ 800 DEG C; When described control is cold, controlled cooling model speed is 5 ~ 8 DEG C/s, and the red temperature controlling steel plate is 550 ~ 600 DEG C; Air cooling is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310157455.XA CN103233169B (en) | 2013-05-02 | 2013-05-02 | The high strength thin specification steel plate that plate shape is excellent and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310157455.XA CN103233169B (en) | 2013-05-02 | 2013-05-02 | The high strength thin specification steel plate that plate shape is excellent and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103233169A CN103233169A (en) | 2013-08-07 |
| CN103233169B true CN103233169B (en) | 2015-09-16 |
Family
ID=48881233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310157455.XA Active CN103233169B (en) | 2013-05-02 | 2013-05-02 | The high strength thin specification steel plate that plate shape is excellent and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103233169B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI642791B (en) * | 2016-03-31 | 2018-12-01 | 日商神戶製鋼所股份有限公司 | Non-heat treated bolt wire, non-heat treated bolt steel wire and their manufacturing method and non-heat treated bolt |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086349A (en) * | 2016-07-28 | 2016-11-09 | 柳州科尔特锻造机械有限公司 | A kind of TI microalloy hot-rolling method |
| CN110724875B (en) * | 2019-09-20 | 2021-10-26 | 南京钢铁股份有限公司 | Steel plate for railway and manufacturing method for improving yield strength of steel plate |
| CN111471937B (en) * | 2020-05-11 | 2021-09-14 | 河北普阳钢铁有限公司 | Low-cost chromium-containing Q460MC steel plate and production method thereof |
| CN113235010B (en) * | 2021-05-19 | 2022-05-10 | 宝武集团鄂城钢铁有限公司 | Preparation method of nuclear power steel plate with thin specification and uniform whole plate performance |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102851591A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | High-strength high-toughness low temperature steel for ship and manufacture method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60255957A (en) * | 1984-05-31 | 1985-12-17 | Nissan Motor Co Ltd | Steel for cold forging |
| JP4910638B2 (en) * | 2006-10-31 | 2012-04-04 | Ｊｆｅスチール株式会社 | Manufacturing method of thick steel plate with excellent brittle crack propagation stop properties |
-
2013
- 2013-05-02 CN CN201310157455.XA patent/CN103233169B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102851591A (en) * | 2011-06-28 | 2013-01-02 | 鞍钢股份有限公司 | High-strength high-toughness low temperature steel for ship and manufacture method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI642791B (en) * | 2016-03-31 | 2018-12-01 | 日商神戶製鋼所股份有限公司 | Non-heat treated bolt wire, non-heat treated bolt steel wire and their manufacturing method and non-heat treated bolt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103233169A (en) | 2013-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105506494B (en) | A kind of yield strength 800MPa grade high ductilities hot-rolling high-strength steel and its manufacture method | |
| CN103526111B (en) | Hot-rolled plate band steel with yield strength being 900MPa and preparation method thereof | |
| CN102796967B (en) | 800 MPa economic corrosion-resistance and high-strength steel plate | |
| CN106811698B (en) | A kind of high strength steel plate and its manufacture method based on tissue precise controlling | |
| CN102400053B (en) | Steel plate for building structure with yield strength of 460 MPa, and manufacturing method thereof | |
| CN104928568A (en) | Ferrite low-density high-strength steel and manufacturing method thereof | |
| CN102839329B (en) | Cold-rolling double-phase-steel steel plate with tensile strength of 450 MPa, and preparation method thereof | |
| CN103882320B (en) | Stretch flangeability and the excellent high strength cold rolled steel plate of spot weldability and manufacture method thereof | |
| CN102758131B (en) | Production method of 600MPa grade cold rolling dual-phase steel | |
| CN107190203B (en) | With the yield strength >=800MPa hot rolled sheet and production method of sheet billet Direct Rolling | |
| CN106636911B (en) | With the 900MPa grade hot rolled steel sheets and its manufacturing method of sheet billet Direct Rolling | |
| CN104498821B (en) | Medium-manganese high-strength steel for automobiles and production method thereof | |
| CN102304664A (en) | High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof | |
| CN102965568B (en) | Phase toughness Low Alloy Steel Plate and preparation method thereof | |
| CN109112419A (en) | Ocean engineering quenched EH550 super-thick steel plate and its manufacturing method | |
| CN103233169B (en) | The high strength thin specification steel plate that plate shape is excellent and production method thereof | |
| CN101736199A (en) | Hot rolling strip steel for high-strength cold forming welding structures and manufacturing method thereof | |
| CN103882330A (en) | Non-quenched and tempered steel plate with low yield ratio and super high strength and producing method thereof | |
| CN104120368A (en) | High-strength austenitic stainless steel for automobile frames and manufacturing method thereof | |
| CN104328350A (en) | Hardened and tempered steel with yield strength of 960MPa level and manufacturing method of hardened and tempered steel | |
| CN110079728A (en) | A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method | |
| CN105925905A (en) | Nb-Ti-series 780MPa-class hot-rolled dual-phase steel and production method thereof | |
| US20240167138A1 (en) | Dual-phase steel and hot-dip galvanized dual-phase steel having tensile strength greater than or equal to 980mpa and method for manufacturing same by means of rapid heat treatment | |
| CN103361552A (en) | V-N microalloying 460MPa-level thick plate and manufacturing method thereof | |
| CN103276315A (en) | 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180323 Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Echeng Iron and Steel Co., Ltd., of Wuhan Iron and Steel Group Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Patentee before: Wuhan Iron & Steel (Group) Corp. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Baowu group Echeng Iron and Steel Co., Ltd Address before: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee before: WUHAN IRON AND STEEL GROUP ECHENG IRON AND STEEL Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |