CN104328253A - Special thick plate stacking slow-cooling method - Google Patents
Special thick plate stacking slow-cooling method Download PDFInfo
- Publication number
- CN104328253A CN104328253A CN201410523911.2A CN201410523911A CN104328253A CN 104328253 A CN104328253 A CN 104328253A CN 201410523911 A CN201410523911 A CN 201410523911A CN 104328253 A CN104328253 A CN 104328253A
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- temperature
- plate
- cooling
- thick plate
- special thick
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The present invention relates to a special thick plate stacking slow-cooling method, which comprises: (a) placing a continuous casting slab into a double heat storage type heating furnace, and adopting blast furnace coal gas as a medium to heat so as to obtain the treated continuous casting slab; (2) placing the treated continuous casting slab in a single rack rolling mill to carry out first-stage rolling so as to obtain the first-stage rolled middle plate; (3) carrying out automatic temperature delaying control on the first-stage rolled middle plate to obtain the temperature delayed middle plate; (4) carrying out second-stage rolling on the temperature delayed middle plate to obtain the special thick plate; (5) cooling the special thick plate in a steam mist manner to obtain the cooled special thick plate; (6) straightening the cooled special thick plate to obtain the special thick plate with the qualified flatness; (7) carrying out stacking slow-cooling on the special thick plate with the qualified flatness to obtain the slowly-cooled special thick plate; and (9) adopting flame to cut the slowly-cooled special thick plate, carrying out sampling inspection in batches according to the conventional method, automatically marking on the surface and marking the side label after passing the inspection, determining, and warehousing. With the special thick plate stacking slow-cooling method, the mechanical property of the special thick plate can be effectively improved.
Description
Technical field
The present invention relates to technical field of heat treatment, particularly relate to special heavy plate stacking slow cooling method.
Background technology
It is inconsistent that the phenomenon that special heavy plate steel plate occurs in a thickness direction is mainly grain fineness number, and there is some difference for tissue and form.Grain fineness number feature is that central position, steel plate thickness direction grain fineness number is greater than surface of steel plate; May there is bainite structure in surface, central position pearlitic structure, and the two existing forms above, as distribution, grain-size there are differences.
At present, in special heavy plate production process, because compression ratio is little, by low temperature rolling and cool fast, there is ununiformity in interior tissue, and mechanical performance index fluctuation is large, in follow-up process air cooler, along with the difference of edge, heart portion temperature drop and upper and lower surface temperature drop expands, the ununiformity of interior tissue expands further, and the mechanical property of special heavy plate is difficult to effectively be ensured.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of special heavy plate stacking slow cooling method improving special heavy plate mechanical property.
For solving the problem, special heavy plate stacking slow cooling method of the present invention, comprises the following steps:
(1) be that double-regenerative heating furnace put into by the continuous casting steel billet of 220 × 1580 × 2000mm ~ 220 × 1580 × 2800mm by specification, blast furnace gas sent in described double-regenerative heating furnace meanwhile; Then be carry out preheating under the condition of 1000 ~ 1100 DEG C in temperature, be heat under the condition of 1150 ~ 1250 DEG C in temperature after 60min, be carry out soaking under the condition of 1180 ~ 1230 DEG C in temperature after 50min, come out of the stove after 60min, through thick de-scaling, remove the raw iron scale of surperficial stove and obtain the continuous casting steel billet after processing;
(2) the continuous casting steel billet after described process is put into 2800mm single stand mill, start rolling temperature be 1030 ~ 1080 DEG C, finishing temperature carries out one-phase rolling under being the condition of 950 ~ 1020 DEG C, obtains the intermediate plate of one-phase rolling;
(3) the intermediate plate of described one-phase rolling is being treated automatically to treat temperature control under temperature thickness is the condition of 2 ~ 3 times of finished product thickness, and 120s obtains the intermediate plate after temperature;
(4) described intermediate plate after temperature is put into 2800mm single stand mill, start rolling temperature be 800 ~ 850 DEG C, finishing temperature carries out two-stage rolling under being the condition of 750 ~ 800 DEG C, is met the special heavy plate of geometrical dimension tolerances required by finished steel plate;
By described special heavy plate with the steam fog formula type of cooling, cooling temperature be 650 ~ 690 DEG C, cooling time is 32s, rate of cooling carries out controlled cooling model by post-rolling control cooling process under being the condition of 5 DEG C/s, obtains cooled special heavy plate;
(6) described cooled special heavy plate is put into the powerful thermal straightening machine of 11 rollers, be align under the condition of 500 ~ 600 DEG C in temperature, eliminate unrelieved stress, obtain the special heavy plate that planeness is qualified;
(7) special heavy plate qualified for described planeness is put into Rolling Disc Cooling Bed, adopt after air cooling to 350 DEG C below buttress position and lay the warm steel plate of band, buttress position upper surface covers and be with the mode of warm steel plate to carry out stacking to special heavy plate, and make stacking temperature be 250 DEG C ~ 350 DEG C, when buttress temperature drop is to de-stacking during room temperature, obtain the special heavy plate after slow cooling;
(9) the special heavy plate after described slow cooling is adopted flame cutting, and carry out inspection by sampling by criticizing according to a conventional method; After the assay was approved, surface head-stamp automatically, side mark, judge to put in storage.
The present invention compared with prior art has the following advantages:
1, the present invention adopts three sections of modes heated to process continuous casting steel billet, slab can be made slowly to heat, internal grain is thick, overheated, burning etc. adds thermal defect to avoid steep temperature rise to cause, play the slab subsurface defect eliminated casting process and cause simultaneously, reduce resistance to deformation, improve the effect of plasticity.
2, the present invention adopts the steam fog formula type of cooling, improves the cooling uniformity of steel plate and cold permeability.
3, the present invention adopts buttress slow cooling technology except row's hydrogen, improves except flaw detection qualification rate, can go up largely under the prerequisite not affecting production, by the utilization of online waste heat, the grain uniformity in adjustment steel plate thickness direction, improve surface and interior tissue performance difference, and then improve the mechanical properties such as the extension of steel plate, impact and Z-direction performance.
4, the present invention can avoid the substantial contribution of heat-treatment lines to drop into, and the scope that can process steel plate is 40 ~ 80mm.
Embodiment
Special heavy plate stacking slow cooling method, comprises the following steps:
(1) be that double-regenerative heating furnace put into by the continuous casting steel billet of 220 × 1580 × 2000mm ~ 220 × 1580 × 2800mm by specification, blast furnace gas sent in described double-regenerative heating furnace meanwhile; Then be carry out preheating under the condition of 1000 ~ 1100 DEG C in temperature, be heat under the condition of 1150 ~ 1250 DEG C in temperature after 60min, be carry out soaking under the condition of 1180 ~ 1230 DEG C in temperature after 50min, come out of the stove after 60min, through thick de-scaling, remove the raw iron scale of surperficial stove and obtain the continuous casting steel billet after processing;
(2) the continuous casting steel billet after process is put into 2800mm single stand mill, start rolling temperature be 1030 ~ 1080 DEG C, finishing temperature carries out one-phase rolling under being the condition of 950 ~ 1020 DEG C, obtains the intermediate plate of one-phase rolling;
(3) the intermediate plate of one-phase rolling is being treated automatically to treat temperature control under temperature thickness is the condition of 2 ~ 3 times of finished product thickness, and 120s obtains the intermediate plate after temperature;
(4) the intermediate plate after temperature is put into 2800mm single stand mill, start rolling temperature be 800 ~ 850 DEG C, finishing temperature carries out two-stage rolling under being the condition of 750 ~ 800 DEG C, is met the special heavy plate of geometrical dimension tolerances required by finished steel plate;
By special heavy plate with the steam fog formula type of cooling, cooling temperature be 650 ~ 690 DEG C, cooling time is 32s, rate of cooling carries out controlled cooling model by post-rolling control cooling process under being the condition of 5 DEG C/s, obtains cooled special heavy plate;
(6) cooled special heavy plate is put into the powerful thermal straightening machine of 11 rollers, be align under the condition of 500 ~ 600 DEG C in temperature, eliminate unrelieved stress, obtain the special heavy plate that planeness is qualified;
(7) special heavy plate qualified for planeness is put into Rolling Disc Cooling Bed, adopt after air cooling to 350 DEG C below buttress position and lay the warm steel plate of band, buttress position upper surface covers and be with the mode of warm steel plate to carry out stacking to special heavy plate, and make stacking temperature be 250 DEG C ~ 350 DEG C, when buttress temperature drop is to de-stacking during room temperature, obtain the special heavy plate after slow cooling;
(9) the special heavy plate after slow cooling is adopted flame cutting, and carry out inspection by sampling by criticizing according to a conventional method; After the assay was approved, surface head-stamp automatically, side mark, judge to put in storage.
Claims (1)
1. special heavy plate stacking slow cooling method, comprises the following steps:
(1) be that double-regenerative heating furnace put into by the continuous casting steel billet of 220 × 1580 × 2000mm ~ 220 × 1580 × 2800mm by specification, blast furnace gas sent in described double-regenerative heating furnace meanwhile; Then be carry out preheating under the condition of 1000 ~ 1100 DEG C in temperature, be heat under the condition of 1150 ~ 1250 DEG C in temperature after 60min, be carry out soaking under the condition of 1180 ~ 1230 DEG C in temperature after 50min, come out of the stove after 60min, through thick de-scaling, remove the raw iron scale of surperficial stove and obtain the continuous casting steel billet after processing;
(2) the continuous casting steel billet after described process is put into 2800mm single stand mill, start rolling temperature be 1030 ~ 1080 DEG C, finishing temperature carries out one-phase rolling under being the condition of 950 ~ 1020 DEG C, obtains the intermediate plate of one-phase rolling;
(3) the intermediate plate of described one-phase rolling is being treated automatically to treat temperature control under temperature thickness is the condition of 2 ~ 3 times of finished product thickness, and 120s obtains the intermediate plate after temperature;
(4) described intermediate plate after temperature is put into 2800mm single stand mill, start rolling temperature be 800 ~ 850 DEG C, finishing temperature carries out two-stage rolling under being the condition of 750 ~ 800 DEG C, is met the special heavy plate of geometrical dimension tolerances required by finished steel plate;
By described special heavy plate with the steam fog formula type of cooling, cooling temperature be 650 ~ 690 DEG C, cooling time is 32s, rate of cooling carries out controlled cooling model by post-rolling control cooling process under being the condition of 5 DEG C/s, obtains cooled special heavy plate;
(6) described cooled special heavy plate is put into the powerful thermal straightening machine of 11 rollers, be align under the condition of 500 ~ 600 DEG C in temperature, eliminate unrelieved stress, obtain the special heavy plate that planeness is qualified;
(7) special heavy plate qualified for described planeness is put into Rolling Disc Cooling Bed, adopt after air cooling to 350 DEG C below buttress position and lay the warm steel plate of band, buttress position upper surface covers and be with the mode of warm steel plate to carry out stacking to special heavy plate, and make stacking temperature be 250 DEG C ~ 350 DEG C, when buttress temperature drop is to de-stacking during room temperature, obtain the special heavy plate after slow cooling;
(9) the special heavy plate after described slow cooling is adopted flame cutting, and carry out inspection by sampling by criticizing according to a conventional method; After the assay was approved, surface head-stamp automatically, side mark, judge to put in storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410523911.2A CN104328253A (en) | 2014-10-08 | 2014-10-08 | Special thick plate stacking slow-cooling method |
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| CN201410523911.2A CN104328253A (en) | 2014-10-08 | 2014-10-08 | Special thick plate stacking slow-cooling method |
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| CN104328253A true CN104328253A (en) | 2015-02-04 |
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| CN201410523911.2A Pending CN104328253A (en) | 2014-10-08 | 2014-10-08 | Special thick plate stacking slow-cooling method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521119A (en) * | 2016-09-30 | 2017-03-22 | 秦皇岛首秦金属材料有限公司 | High-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method |
| CN106694549A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Production method of super-thick carbon die steel plate |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10185442A (en) * | 1996-12-26 | 1998-07-14 | Kawasaki Steel Corp | Method for heating furnace interior |
| CN102061426A (en) * | 2010-12-21 | 2011-05-18 | 南阳汉冶特钢有限公司 | 400-420mm large-thickness low-alloy high-strength constructional steel and production method thereof |
| CN102345047A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | 150mm Q245R extra thick plate and production method thereof |
| CN102409236A (en) * | 2011-11-14 | 2012-04-11 | 湖南华菱湘潭钢铁有限公司 | Method for producing super-thick steel plate |
| CN103205640A (en) * | 2013-03-16 | 2013-07-17 | 南阳汉冶特钢有限公司 | E40 high-strength ship plate steel and method for manufacturing same |
| CN103468872A (en) * | 2013-09-18 | 2013-12-25 | 济钢集团有限公司 | Low-compression-ratio extremely thick vessel plate production process |
-
2014
- 2014-10-08 CN CN201410523911.2A patent/CN104328253A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10185442A (en) * | 1996-12-26 | 1998-07-14 | Kawasaki Steel Corp | Method for heating furnace interior |
| CN102061426A (en) * | 2010-12-21 | 2011-05-18 | 南阳汉冶特钢有限公司 | 400-420mm large-thickness low-alloy high-strength constructional steel and production method thereof |
| CN102345047A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | 150mm Q245R extra thick plate and production method thereof |
| CN102409236A (en) * | 2011-11-14 | 2012-04-11 | 湖南华菱湘潭钢铁有限公司 | Method for producing super-thick steel plate |
| CN103205640A (en) * | 2013-03-16 | 2013-07-17 | 南阳汉冶特钢有限公司 | E40 high-strength ship plate steel and method for manufacturing same |
| CN103468872A (en) * | 2013-09-18 | 2013-12-25 | 济钢集团有限公司 | Low-compression-ratio extremely thick vessel plate production process |
Non-Patent Citations (1)
| Title |
|---|
| 许少普等: ""提高中厚板探伤合格率实践"", 《中国冶金》, vol. 21, no. 4, 30 April 2011 (2011-04-30), pages 34 - 36 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106694549A (en) * | 2015-11-17 | 2017-05-24 | 鞍钢股份有限公司 | Production method of super-thick carbon die steel plate |
| CN106694549B (en) * | 2015-11-17 | 2018-06-26 | 鞍钢股份有限公司 | Production method of super-thick carbon die steel plate |
| CN106521119A (en) * | 2016-09-30 | 2017-03-22 | 秦皇岛首秦金属材料有限公司 | High-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method |
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Application publication date: 20150204 |