CN102251176A - Method for rolling ship plate pitting-resistant blue steel - Google Patents
Method for rolling ship plate pitting-resistant blue steel Download PDFInfo
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- CN102251176A CN102251176A CN 201110162192 CN201110162192A CN102251176A CN 102251176 A CN102251176 A CN 102251176A CN 201110162192 CN201110162192 CN 201110162192 CN 201110162192 A CN201110162192 A CN 201110162192A CN 102251176 A CN102251176 A CN 102251176A
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Abstract
The invention discloses a method for rolling ship plate pitting-resistant blue steel, and belongs to the technical field of steel for ship structures. The method comprises the following steps of: clearing and inspecting, putting into a plate blank heating furnace for heating, taking blanks out of the furnace, and performing primary descaling on steel billets by using high pressure water; rolling the steel billets subjected to primary descaling in a roughing mill, and performing secondary descaling in odd passes; performing finish rolling, wherein the thickness of a finish rolled pipe is 3 to 5 times that of a finished steel plate, and the reduction pass is 1 to 20mm; and performing laminar cooling on the steel plate. The method has the advantages of improving the surface quality of a ship plate, reducing defective products caused by surface roughness, pits, scale marks and the like, and reducing production cost; meanwhile, various properties meet shipping standard requirements.
Description
Technical field
The invention belongs to ship hull structure use steel technical field, particularly relate to the rolling method of the anti-spot corrosion blue steel of a kind of deck of boat.
Background technology
Shipping industry is the important component part of Chinese national economy, and it is a technology-intensive industries, is again labor-intensive industry.Accelerate development shipping industry,, have important pushing effect for improving China's production integral level, driving related industrieies development such as iron and steel and supporting dynamo-electric device fabrication and expand employment.
Homemade shipbuilding through for many years effort, can be satisfied the development need, the particularly reorganization and expansion of iron and steel enterprise's Heavy Plate Production line and newly-built the Eleventh Five-Year Plan period of China's shipbuilding with steel plate substantially, and the production of plate of moderate thickness all is improved from quantity to the quality.Yet be, because the boats and ships work under bad environment, barnacle will be subjected to the chemical corrosion of seawater, galvanic corrosion and marine life, and the corrosion of microorganism, very harsh to surperficial specification of quality.Surface quality is one of main quality index of plate of moderate thickness, to the processing of plate of moderate thickness with use material impact is all arranged, thereby is subjected to factory and user's great attention, we can say that the steel plate that does not have the excellent appearance quality is not by the steel plate of customer's approval.Be subjected to the influence of international financial crisis, the shipowner proposes extremely harsh requirement to the hull surface quality, and the consequent is that shipbuilding facilities is had higher requirement to the surface quality of steel mill's deck of boat.
At present, the deck of boat surface color that domestic main plate of moderate thickness company produces is a sorrel substantially, is called " red skin steel ", the surface of steel plate iron scale is thicker, and ferric oxide skin depth and loosening is not strong with the matrix bond of steel, the surface pitting resistance is poor, easily in the scratching middle scaling of dawdling.And external deck of boat surface is black-and-blue, and iron scale is thin and fine and close, and is strong with the basal body binding force of steel.Change this present situation, will start with, increase Fe from the top layer scale structure of the deck of boat
3O
4Contain, make iron scale be black-and-blue, must make the top layer iron scale thin and fine and close simultaneously.The present invention compares with external deck of boat technology, and process control is simple, need not existing descaling system is transformed, and rolling rhythm is fast, and the rolling deck of boat piece of unit hour number increases.
Summary of the invention
The object of the present invention is to provide the production method of the anti-spot corrosion blue steel of a kind of deck of boat, improve deck of boat surface quality, minimizing reduces production costs because of the product of taking out of of generations such as surface irregularity, pit, iron scale are pressed into, and every performance satisfies the ship's classification code requirement simultaneously.
The anti-spot corrosion blue steel of the deck of boat of the present invention common intensity (A, B, D, E) deck of boat composition by weight percentage is designed to:
C:0.15～0.18%, Si:0.10～0.30%, Mn:0.45～0.90%, Nb:0.005～0.02%, Ti:0.005～0.02%, S :≤0.01%, P≤0.02%, Als:0.020～0.04%, surplus is Fe and unavoidable impurities.
High strength (32kg level, 36kg level) deck of boat composition by weight percentage is designed to:
C:0.14～0.17%, Si:0.20～0.30%, Mn:1.30～1.50%, Nb:0.015～0.04%, Ti:0.005～0.02%, S :≤0.005%, P≤0.02%, Als:0.020～0.06%, surplus is Fe and unavoidable impurities.
The following technical parameter of control in rolling technology:
(1) continuous casting heavy slab of smelting by above chemical composition design and technical process, the bar plate heating stove heating of after clear inspection, packing into, Heating temperature is 1160～1220 ℃, heat-up time 150-400min, residual oxygen control 1%-6% generates thickness to reduce the billet surface iron scale as far as possible; Come out of the stove the back steel billet through a de-scaling of high pressure water, and high pressure water pressure is set at 19-21MPa, to guarantee the de-scaling quality one time; Enter mill milling then.
To advance roughing mill rolling for steel billet after (2) de-scalings, odd-numbered pass is opened secondary descaling steel (De-scaling box be positioned at roughing mill before), prevents that the iron scale that does not eliminate is pressed into surface of steel plate, through the rolling 7-9 of roughing road, reduction in pass 10-35mm guarantees that by depressing greatly roughing crystal grain is badly deformed;
It is rolling to advance finish rolling after roughing has been rolled immediately, finish rolling adapter thickness is 3-5 times of Finished Steel plate thickness, make finish rolling have certain accumulation draught, along with the decline iron scale of surface temperature becomes fragile, finish rolling stage draught needs less, and reduction in pass 1-20mm is advisable, the finish rolling start rolling temperature is controlled at 1000～950 ℃, to guarantee that scale on surface at high temperature has good ductility, finish to gauge surface of steel plate temperature is controlled at 920～980 ℃, and surface of steel plate is formed to deceive the Fe of color densification
3O
4It is main scale structure.
(3) steel plate adopts the laminar flow cooling.The finished product steel plate begins to cool down temperature 900-950 ℃, is the temperature drop (30-50 ℃) deducting from finish rolling to the ACC entry process on the finishing temperature basis; Set 680～750 ℃ of final cooling temperatures, mainly the surface quality of this temperature section is better more stable; Set 6～10 ℃/s of cooling rate, low cooling rate is favourable to obtain stable surface quality.
Advantage of the present invention: the present invention has been applied on the deck of boat surface quality problems at present, and through the execution of this novel process, problems such as rough surface of ship plate have obtained solution, and deck of boat surface quality has obtained the improvement of matter, has satisfied shipyard and shipowner's requirement.
Description of drawings
Fig. 1 is the deck of boat " red skin steel " photo.
Fig. 2 is the deck of boat " blue steel " photo of novel process after producing.
Embodiment
The steel plate rolling rear surface is black-and-blue, and scale on surface even compact, ball blast check that the rear surface does not exist iron scale to be pressed into and problem such as surface irregularity, has illustrated that determined deck of boat rolling technology is reasonable, and can guarantee to produce smooth and easy.
The heating of table 1 steel plate, water-cooling process parameter
The rolling technological parameter of table 2 trial-production steel plate
The rolling technological parameter of table 3 trial-production steel plate
The rolling technological parameter of table 4 trial-production steel plate
The rolling technological parameter of table 5 trial-production steel plate
Claims (1)
1. the rolling method of the anti-spot corrosion blue steel of the deck of boat, the anti-spot corrosion blue steel of described deck of boat common intensity composition being designed to by weight percentage:
C:0.15～0.18%, Si:0.10～0.30%, Mn:0.45～0.90%, Nb:0.005～0) .02%, T i:0.005～0.02%, S :≤0.01%, P≤0.02%, Als:0.020～0.04%, surplus is Fe and unavoidable impurities;
High strength composition being designed to by weight percentage:
C:0.14～0.17%, Si:0.20～0.30%, Mn:1.30～1.50%, Nb:0.015～0.04%, Ti:0.005～0.02%, S :≤0.005%, P≤0.02%, Als:0.020～0.06%, surplus is Fe and unavoidable impurities;
It is characterized in that the processing parameter of control is:
(1) continuous casting heavy slab of smelting by above chemical composition design and technical process, the bar plate heating stove heating of after clear inspection, packing into, Heating temperature is 1160～1220 ℃, heat-up time 150-400min, residual oxygen is controlled 1%-6%; Come out of the stove the back steel billet through a de-scaling of high pressure water, and high pressure water pressure is set at 19-21MPa, enters mill milling then;
To advance roughing mill rolling for steel billet after (2) de-scalings, and odd-numbered pass is opened secondary descaling steel, and through the rolling 7-9 of roughing road, reduction in pass 10-35mm guarantees that by depressing greatly roughing crystal grain is badly deformed;
It is rolling that laggard finish rolling has been rolled in roughing, finish rolling adapter thickness is 3-5 times of Finished Steel plate thickness, and reduction in pass 1-20mm, finish rolling start rolling temperature are controlled at 1000～950 ℃, finish to gauge surface of steel plate temperature is controlled at 920～980 ℃, and surface of steel plate is formed to deceive the Fe of color densification
3O
4It is main scale structure;
(3) steel plate adopts the laminar flow cooling, and steel plate begins to cool down temperature 900-950 ℃, is temperature drop 30-50 ℃ deducting from finish rolling to the ACC entry process on the finishing temperature basis; Set 680～750 ℃ of final cooling temperatures, set 6～10 ℃/s of cooling rate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110162192A CN102251176B (en) | 2011-06-16 | 2011-06-16 | Method for rolling ship plate pitting-resistant blue steel |
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| CN201110162192A CN102251176B (en) | 2011-06-16 | 2011-06-16 | Method for rolling ship plate pitting-resistant blue steel |
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| CN102251176A true CN102251176A (en) | 2011-11-23 |
| CN102251176B CN102251176B (en) | 2012-09-05 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527735A (en) * | 2011-12-23 | 2012-07-04 | 秦皇岛首秦金属材料有限公司 | Method for controlling even deformation of edge portion in medium-thick board rolling |
| CN102534152A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN103212571A (en) * | 2013-04-18 | 2013-07-24 | 湖南华菱湘潭钢铁有限公司 | Method for producing oxide scale capable of preventing steel plate surface from getting rusty |
| CN103394529A (en) * | 2013-07-31 | 2013-11-20 | 秦皇岛首秦金属材料有限公司 | Secondary descaling method for improving surface quality of ship boards |
| CN103962386A (en) * | 2014-04-18 | 2014-08-06 | 东北大学 | Oxide scale control method for improving corrosion resistance of hot rolled medium plate |
| CN104525560A (en) * | 2014-12-29 | 2015-04-22 | 天津钢铁集团有限公司 | Effective control method for pitted surface of plain carbon steel/Nb-containing steel plate of 20-30 mm thickness |
| CN104630627A (en) * | 2015-02-15 | 2015-05-20 | 山东钢铁股份有限公司 | Steel plate for DH36 ship structure and low-cost production method thereof |
| CN107282649A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | A kind of control cooling method for preventing that mould steel-plate iron oxide scale from coming off |
| CN110899331A (en) * | 2019-12-05 | 2020-03-24 | 马鞍山钢铁股份有限公司 | Control method of iron oxide powder on surface of hot rolled plate |
| CN113369312A (en) * | 2021-04-13 | 2021-09-10 | 南京钢铁股份有限公司 | Control process for Q235 pockmarks with specification of 25-40mm |
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| CN1164875A (en) * | 1995-08-31 | 1997-11-12 | 川崎制铁株式会社 | Hot-rolled steel sheet and process for producing the same |
| JP2001115233A (en) * | 1999-10-20 | 2001-04-24 | Sumitomo Metal Ind Ltd | High strength steel sheet excellent in weldability and stress corrosion cracking resistance and producing method therefor |
| JP2004244680A (en) * | 2003-02-14 | 2004-09-02 | Nippon Steel Corp | Hot rolled steel plate with excellent scale adhesion, and its manufacturing method |
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Patent Citations (5)
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| JPH062037A (en) * | 1992-06-15 | 1994-01-11 | Kawasaki Steel Corp | Production of non-heattreated high tensile strength steel having >=70kgf/mm2 tensile strength |
| US5609818A (en) * | 1992-12-11 | 1997-03-11 | Nippon Steel Corporation | Steel excellent in corrosion resistance and processability |
| CN1164875A (en) * | 1995-08-31 | 1997-11-12 | 川崎制铁株式会社 | Hot-rolled steel sheet and process for producing the same |
| JP2001115233A (en) * | 1999-10-20 | 2001-04-24 | Sumitomo Metal Ind Ltd | High strength steel sheet excellent in weldability and stress corrosion cracking resistance and producing method therefor |
| JP2004244680A (en) * | 2003-02-14 | 2004-09-02 | Nippon Steel Corp | Hot rolled steel plate with excellent scale adhesion, and its manufacturing method |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527735A (en) * | 2011-12-23 | 2012-07-04 | 秦皇岛首秦金属材料有限公司 | Method for controlling even deformation of edge portion in medium-thick board rolling |
| CN102534152A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN102534152B (en) * | 2012-01-31 | 2014-08-27 | 首钢总公司 | Rolling method capable of preventing pockmarks on surface of ship plate |
| CN103212571B (en) * | 2013-04-18 | 2015-06-10 | 湖南华菱湘潭钢铁有限公司 | Method for producing oxide scale capable of preventing steel plate surface from getting rusty |
| CN103212571A (en) * | 2013-04-18 | 2013-07-24 | 湖南华菱湘潭钢铁有限公司 | Method for producing oxide scale capable of preventing steel plate surface from getting rusty |
| CN103394529A (en) * | 2013-07-31 | 2013-11-20 | 秦皇岛首秦金属材料有限公司 | Secondary descaling method for improving surface quality of ship boards |
| CN103962386B (en) * | 2014-04-18 | 2016-01-20 | 东北大学 | The corrosion proof iron scale control method of a kind of raising hot rolled steel plate |
| CN103962386A (en) * | 2014-04-18 | 2014-08-06 | 东北大学 | Oxide scale control method for improving corrosion resistance of hot rolled medium plate |
| CN104525560A (en) * | 2014-12-29 | 2015-04-22 | 天津钢铁集团有限公司 | Effective control method for pitted surface of plain carbon steel/Nb-containing steel plate of 20-30 mm thickness |
| CN104630627A (en) * | 2015-02-15 | 2015-05-20 | 山东钢铁股份有限公司 | Steel plate for DH36 ship structure and low-cost production method thereof |
| CN104630627B (en) * | 2015-02-15 | 2016-09-21 | 山东钢铁股份有限公司 | A kind of DH36 ship structure steel plate and Low-cost production method thereof |
| CN107282649A (en) * | 2016-04-04 | 2017-10-24 | 鞍钢股份有限公司 | A kind of control cooling method for preventing that mould steel-plate iron oxide scale from coming off |
| CN110899331A (en) * | 2019-12-05 | 2020-03-24 | 马鞍山钢铁股份有限公司 | Control method of iron oxide powder on surface of hot rolled plate |
| CN110899331B (en) * | 2019-12-05 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Control method of iron oxide powder on surface of hot rolled plate |
| CN113369312A (en) * | 2021-04-13 | 2021-09-10 | 南京钢铁股份有限公司 | Control process for Q235 pockmarks with specification of 25-40mm |
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| CN102251176B (en) | 2012-09-05 |
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Address after: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee after: Shougang Group Co. Ltd. Patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Capital Iron & Steel General Company Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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Effective date of registration: 20190410 Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Shougang Group Co. Ltd. Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |