CN1614067A - Superfine crystal particle hot-rolling steel plate with thick specification and production thereof - Google Patents
Superfine crystal particle hot-rolling steel plate with thick specification and production thereof Download PDFInfo
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- CN1614067A CN1614067A CN 200410040735 CN200410040735A CN1614067A CN 1614067 A CN1614067 A CN 1614067A CN 200410040735 CN200410040735 CN 200410040735 CN 200410040735 A CN200410040735 A CN 200410040735A CN 1614067 A CN1614067 A CN 1614067A
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Abstract
The invention was involved in the preparation method of thick hot rolled steel plate with ultra-fine grain. The alloy consist of 0.13-0.18%C, 0.12-0.30% Si, 0.50-0.70%Mn, is less than or equal to 0.020% P and is less than or equal to 0.015%S. The technology included the following steps: a) the heating-up temperature of continuous cast ingot was 1150-1200deg.C. b) The temperature of coarse crushing was 950-1000deg.C. c) The thickness of intermediate ingot after coarse crushing was 30-35mm. d) Inlet temperature of fine rolling was 880-920deg.C. e) Five or six groups frameworks were used in the rolling process of fine rolling. f) Three or four groups cooling water were input among the frameworks. g) Outlet temperature of fine rolling was 800-830deg.C. h) The reel temperature was 500-560deg.C. Chemical constitution of the hot rolling steel plate was simple and the cost was low. Ultra-fine grain hot rolling steel plate with 6.5-8.0mm thick was formed by controlling heating, coarse rolling and cooling. The steel plate had fine strength of extension, yield strength, extensibility and cold bending performance.
Description
Technical field
The present invention relates to a kind of steel plate and production technique thereof, particularly relate to a kind of thick specification hot-rolled and production technique with superfine crystal particle.
Background technology
For the Q235 straight carbon steel, on the traditional hot continuous mill, adopt conventional rolling technology to be rolled, that is: Heating temperature adopts 1250 ℃, and the roughing temperature is 970 ℃, and the finish rolling temperature in is 950 ℃～1000 ℃, temperature out is 850 ℃～920 ℃, coiling temperature is 670 ℃～700 ℃, and the mechanical property scope that the steel plate of producing can reach is: yield strength ReL:235MPa～300MPa, tensile strength Rm:375MPa～500MPa.Thicker (as thickness is the hot-rolled steel sheet of 6.5mm～8.0mm), adopts the rolling technology of above-mentioned routine, and the intensity difficulty that improves steel plate is bigger for thickness.In addition, in order to improve thick specification hot-rolled intensity, be at present on Q235 composition of steel basis, add alloying elements such as V, Ti, Nb, utilize the precipitation precipitation strength effect of alloying elements such as V, Ti, Nb or the intensity that the refined crystalline strengthening effect improves steel.But because alloying element price comparison height, so the price comparison height of this steel, and technology controlling and process is also difficult.
Summary of the invention
Technical problem to be solved by this invention provides the high-strength thick-specification superfine crystal grain hot-rolled steel plate that a kind of composition is simple, cost is low.
The present invention also will provide a kind of production technique that improves above-mentioned armor plate strength.
The technical scheme that technical solution problem of the present invention is adopted is: a kind of hot-rolled steel sheet of thick specification superfine crystal particle, and the weight percent of its chemical ingredients comprises: C:0.13～0.18%; Si:0.12～0.30%; Mn:0.50～0.70%; P :≤0.020%; S :≤0.015%.
Producing the production technique of above-mentioned thick specification superfine crystal grain hot-rolled steel plate: a, continuously cast bloom heating tapping temperature is 1150～1200 ℃; B, roughing temperature are 950～1000 ℃; Intermediate blank thickness is 30～35mm after c, the roughing; D, hot fine rolling temperature in are 880～920 ℃; E, finish rolling adopt five～six frames to be rolled; Water coolant between f, three groups or four groups frames of input; G, hot fine rolling temperature out are 800～830 ℃; H, coiling temperature are 500～560 ℃.
The invention has the beneficial effects as follows: the chemical ingredients of steel is simple, easy to control, cost is low.The present invention is by adopting whole process control techniquess such as control heating, roughing, finish rolling and cooling, and producing microstructure is the hot-rolled steel sheet that ferrite and pearlitic ferrite average grain size are 4～6 μ m, can realize on traditional hot continuous mill.The superfine crystal grain hot-rolled steel plate of 6.5mm～8.0mm thickness that chemical ingredients that the present invention adopts and production technique thereof are produced has the characteristics of good combination properties such as tensile strength and yield strength height, unit elongation is higher, cold-bending property is good.
Embodiment
Below in conjunction with embodiment the present invention is further described.
Embodiment 1:
Converter smelting Q235 straight carbon steel, the weight percent of the chemical ingredients of steel comprises: C:0.13%, Si:0.22%, Mn:0.52%, P:0.018%, S:0.010%.With conventional continuous cast method steel is cast into the continuous casting steel billet of 200 * (800～1200) * 5500mm, slab is delivered on the 1450mm hot continuous mill and is rolled, and whole process control is carried out in heating, rolling and cooling, and the hot rolling technology controlling and process is as follows:
A, control continuous casting steel billet heating tapping temperature are 1180 ℃; B, slab carry out roughing at 970 ℃, and roughing adopts six passages rolling; Intermediate blank thickness is 31mm after c, the roughing; D, hot fine rolling temperature in are 890 ℃; E, finish rolling adopt six frames to be rolled; Water coolant between f, three groups of frames of input; G, hot fine rolling temperature out are 810 ℃; H, coiling temperature are 540 ℃.
The hot-rolled steel thickness of slab 6.5mm that produces, the mechanical property of steel plate is: ReL=420MPa, Rm=565MPa, unit elongation A=29%, cold-bending property is: B=35mm, α=180 ° d=a is qualified.
Embodiment 2:
Converter smelting Q235 straight carbon steel, the weight percent of the chemical ingredients of steel comprises: C:0.15%, Si:0.25%, Mn:0.61%, P:0.015%, S:0.008%.With conventional continuous cast method steel is cast into the continuous casting steel billet of 200 * (800～1200) * 5500mm, slab is delivered on the 1450mm hot continuous mill and is rolled, and whole process control is carried out in heating, rolling and cooling, and the hot rolling technology controlling and process is as follows:
A, control continuous casting steel billet heating tapping temperature are 1200 ℃; B, slab carry out roughing at 980 ℃; Intermediate blank thickness is 34.5mm after c, the roughing; D, hot fine rolling temperature in are 910 ℃; E, finish rolling adopt five frames to be rolled; Water coolant between f, four groups of frames of input; G, hot fine rolling temperature out are 830 ℃; H, coiling temperature are 520 ℃.
The hot-rolled steel thickness of slab 7.0mm that produces, the mechanical property of steel plate is: ReL=410MPa, Rm=540MPa, A=27%, cold-bending property is: B=35mm, α=180 ° d=a is qualified.
Embodiment 3:
Converter smelting Q235 straight carbon steel, the weight percent of the chemical ingredients of steel comprises: C:0.17%, Si:0.25%, Mn:0.68%, P:0.015%, S:0.009%.With conventional continuous cast method steel is cast into the continuous casting steel billet of 200 * (800～1200) * 5500mm, slab is delivered on the 1450mm hot continuous mill and is rolled, and whole process control is carried out in heating, rolling and cooling etc., and the hot rolling technology controlling and process is as follows:
A, control continuous casting steel billet heating tapping temperature are 1200 ℃; B, slab carry out roughing at 980 ℃; Intermediate blank thickness is 35.5mm after c, the roughing; D, hot fine rolling temperature in are 920 ℃; E, finish rolling adopt five frames to be rolled; Water coolant between f, four groups of frames of input; G, hot fine rolling temperature out are 830 ℃; H, coiling temperature are 500 ℃.
The hot-rolled steel thickness of slab 8.0mm that produces, the mechanical property of steel plate is: ReL=385MPa, Rm=535MPa, A=27%, cold-bending property is: B=35mm, α=180 ° d=a is qualified.
By adopting lower heating tapping temperature, refinement original austenite grains; Roughing adopts six passages to roll, the lower temperature in of control finishing mill, and thicker intermediate blank thickness improves the bigger deformation rate of each passage of finish rolling, induces the superfine ferrite crystal grain; Control finish rolling temperature in, and drop into water coolant between three groups or four groups of frames, control finish rolling temperature out, adopt lower coiling temperature, suppress growing up of superfine ferrite crystal grain, obtaining microstructure is ferrite and pearlitic hot-rolled steel sheet, its ferrite average grain size is 4～6 μ m, the ferrite volume fraction is 15～20%, and the mechanical property of hot-rolled steel sheet is: ReL 〉=345MPa, Rm 〉=510MPa, A 〉=26%, cold-bending property is: B=35mm, α=180 ° d=a is qualified.Steel plate has good comprehensive performances.
Claims (3)
1, a kind of hot-rolled steel sheet of thick specification superfine crystal particle is characterized in that: the weight percent of its chemical ingredients comprises: C:0.13～0.18%; Si:0.12～0.30%; Mn:0.50～0.70%; P :≤0.020%; S :≤0.015%.
2, the production technique of the described thick specification superfine crystal grain hot-rolled steel plate of a kind of production claim 1 is characterized in that:
A, continuously cast bloom heating tapping temperature are 1150～1200 ℃;
B, roughing temperature are 950～1000 ℃;
Intermediate blank thickness is 30～35mm after c, the roughing;
D, hot fine rolling temperature in are 880～920 ℃;
E, finish rolling adopt five～six frames to be rolled;
Water coolant between f, three groups or four groups frames of input;
G, hot fine rolling temperature out are 800～830 ℃;
H, coiling temperature are 500～560 ℃.
3, the production technique of thick specification superfine crystal grain hot-rolled steel plate as claimed in claim 2 is characterized in that: the described roughing of step b adopts six passages rolling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410040735 CN1614067A (en) | 2004-09-23 | 2004-09-23 | Superfine crystal particle hot-rolling steel plate with thick specification and production thereof |
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| CN 200410040735 CN1614067A (en) | 2004-09-23 | 2004-09-23 | Superfine crystal particle hot-rolling steel plate with thick specification and production thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007079625A1 (en) * | 2006-01-06 | 2007-07-19 | Angang Steel Company Limited | An ultrafine grain steel sheet produced by continuous casting and rolling a medium-thin slab and its manufacture process |
| CN100345639C (en) * | 2005-12-21 | 2007-10-31 | 攀钢集团攀枝花钢铁研究院 | Manufacturing method of ultrafine crystal thin hot rolled steel plate and hot rolled steel plate produced thereby |
| CN101824525A (en) * | 2010-05-07 | 2010-09-08 | 攀钢集团钢铁钒钛股份有限公司 | Production method of hot milling steel plate |
| CN101899611A (en) * | 2010-08-27 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | Structural hot rolled steel plate and production method thereof |
| CN101979695A (en) * | 2010-11-17 | 2011-02-23 | 昆明理工大学 | Chromium-free high boron iron-based casting alloy and preparation method |
| CN101336303B (en) * | 2006-01-26 | 2011-04-06 | 乔瓦尼·阿尔维迪 | Hot-rolled microalloy low carbon steel band |
| CN102628139A (en) * | 2012-05-09 | 2012-08-08 | 武汉钢铁(集团)公司 | Low-cost and high-ductility steel with tensile strength of 400 MPa for cold roll forming and manufacturing method thereof |
| CN103157658A (en) * | 2013-04-12 | 2013-06-19 | 湖南华菱涟源钢铁有限公司 | Process of rolling stainless steel coil in conventional hot continuous rolling production line |
| CN103343286A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Pipeline steel smaller than 300MPa and production method thereof |
| CN103572021A (en) * | 2013-11-05 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling widmannstatten structure in upgrade of C-Mn steel |
| CN103572023A (en) * | 2013-10-24 | 2014-02-12 | 南京钢铁股份有限公司 | Method for producing ultra-fine grains on surface layer of thick/ultra-thick low-alloy steel plate |
| CN103774052A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Method for preparing high-strength steel plate with thickness of 20 mm |
| CN103774050A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | High-ductility steel with low yield ratio |
| CN103773935A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm |
| CN115369302A (en) * | 2022-08-03 | 2022-11-22 | 新疆八一钢铁股份有限公司 | Production method of Q235-T steel plate for papermaking roller |
-
2004
- 2004-09-23 CN CN 200410040735 patent/CN1614067A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345639C (en) * | 2005-12-21 | 2007-10-31 | 攀钢集团攀枝花钢铁研究院 | Manufacturing method of ultrafine crystal thin hot rolled steel plate and hot rolled steel plate produced thereby |
| WO2007079625A1 (en) * | 2006-01-06 | 2007-07-19 | Angang Steel Company Limited | An ultrafine grain steel sheet produced by continuous casting and rolling a medium-thin slab and its manufacture process |
| CN101336303B (en) * | 2006-01-26 | 2011-04-06 | 乔瓦尼·阿尔维迪 | Hot-rolled microalloy low carbon steel band |
| CN101824525A (en) * | 2010-05-07 | 2010-09-08 | 攀钢集团钢铁钒钛股份有限公司 | Production method of hot milling steel plate |
| CN101899611A (en) * | 2010-08-27 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | Structural hot rolled steel plate and production method thereof |
| CN101979695A (en) * | 2010-11-17 | 2011-02-23 | 昆明理工大学 | Chromium-free high boron iron-based casting alloy and preparation method |
| CN102628139A (en) * | 2012-05-09 | 2012-08-08 | 武汉钢铁(集团)公司 | Low-cost and high-ductility steel with tensile strength of 400 MPa for cold roll forming and manufacturing method thereof |
| CN103774050A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | High-ductility steel with low yield ratio |
| CN103774052A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Method for preparing high-strength steel plate with thickness of 20 mm |
| CN103773935A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm |
| CN103157658A (en) * | 2013-04-12 | 2013-06-19 | 湖南华菱涟源钢铁有限公司 | Process of rolling stainless steel coil in conventional hot continuous rolling production line |
| CN103343286A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Pipeline steel smaller than 300MPa and production method thereof |
| CN103343286B (en) * | 2013-07-12 | 2017-02-08 | 鞍钢股份有限公司 | Pipeline steel smaller than 300MPa and production method thereof |
| CN103572023A (en) * | 2013-10-24 | 2014-02-12 | 南京钢铁股份有限公司 | Method for producing ultra-fine grains on surface layer of thick/ultra-thick low-alloy steel plate |
| CN103572023B (en) * | 2013-10-24 | 2015-05-27 | 南京钢铁股份有限公司 | Method for producing ultra-fine grains on surface layer of thick/ultra-thick low-alloy steel plate |
| CN103572021A (en) * | 2013-11-05 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling widmannstatten structure in upgrade of C-Mn steel |
| CN115369302A (en) * | 2022-08-03 | 2022-11-22 | 新疆八一钢铁股份有限公司 | Production method of Q235-T steel plate for papermaking roller |
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