CN101691001A - Method for solving problem of rough surface of ship plate - Google Patents
Method for solving problem of rough surface of ship plate Download PDFInfo
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- CN101691001A CN101691001A CN200910093662A CN200910093662A CN101691001A CN 101691001 A CN101691001 A CN 101691001A CN 200910093662 A CN200910093662 A CN 200910093662A CN 200910093662 A CN200910093662 A CN 200910093662A CN 101691001 A CN101691001 A CN 101691001A
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Abstract
The invention relates to a method for solving the problem of rough surface of a ship plate, belonging to the field of surface quality of medium and thick plates; the method adopts the following processes: the tapping temperature is controlled to be 1200-1260 DEG C, time in the furnace is 180-320min and the heating speed is 1.0-1.2mm/min in the heating process; in the rolling process, an austenite recrystailization zone and an austenite non-recrystailization zone are adopted to control the rolling way, a plurality of blocks are rolled in a sheathing way, so as to ensure the finishing temperature of the austenite non-recrystailization zone to be 800-850 DEG C; laminar cooling is adopted after rolling is carried out, the finish cooling temperature is 600-700 DEG C and the cooling speed is 8-10 DEG C/s. the method has the advantages that the invention is applied to the surface quality of the ship plate, by adopting the technology, the problem that the surface is rough is solved, so as to improve the surface quality of the ship plate qualitatively and improve the product quality and market competitiveness.
Description
Technical field
The present invention relates to a kind of method that is used to solve rough surface of ship plate, a kind of new technology that solves deck of boat surface quality-rough surface problem particularly is provided.
Background technology
Along with the expansion of cut deal field deck of boat output and the introduction of steel plate pre-processing device, quality inspection personnel is found the preceding no significant defect of part deck of boat ball blast in process of production, and but there is the blemish of similar water wave shape in the ball blast rear surface, as shown in Figure 1.The perusal of this kind defective is not obvious, can be observed under strong illumination; Surface matrix occurs concavo-convex, and the degree of depth is not above standard and the ship's classification code requirement below 0.05mm; Defective is irregular distribution at surface of steel plate, and slight only occurs in the part, and all there is this kind defective in serious whole plate face.This blemish has reduced the uniformity of surface of steel plate, and defective can significantly be embodied in follow-up shipbuilding coating process, has mainly influenced the use of hull panel.Be clear and definite notion, above-mentioned defective is defined as rough surface.
The quality of deck of boat surface quality is directly connected to overall build guality of boats and ships and the service life of boats and ships in seawater.Along with the shipbuilding industry market competition is growing more intense, shipyard is also had higher requirement to deck of boat surface quality, domestic and international each big shipyard is checked rough surface successively as its surface quality a pith, and standard has surpassed the requirement of GB and ship's classification standard.All there is this kind surface quality problems to some extent in the deck of boat through investigating at present domestic each big steel mill production, all needs the scheme that solves the rough surface of ship plate problem that finds badly.For adapting to the needs of market development, further improve deck of boat surface quality, reduce deck of boat surface and take the product amount out of, improve the quality of products and the market competitiveness, independent research solve the technology of rough surface of ship plate problem.
Summary of the invention
The object of the present invention is to provide a kind of method that improves deck of boat surface quality, solve the rough surface of ship plate problem, improve deck of boat surface quality simultaneously comprehensively.
Technical scheme of the present invention is: a kind of method that is used to solve rough surface of ship plate, it is characterized in that,
1, heating process: the steel billet tapping temperature is 180-320min at 1200-1260 ℃, time inside furnace, and firing rate is controlled at 1.0～1.2mm/min;
2, rolling mill practice: adopt austenite recrystallization district and austenite non-recrystallization district two stages controlled rolling rolling mode to adopt the polylith cover to roll, guarantee that austenite non-recrystallization district finishing temperature is at 800-850 ℃;
3 roll the back process for cooling: adopt the laminar flow cooling, final cooling temperature is at 600-700 ℃, 10～8 ℃/s of cooldown rate.
The factor that influences deck of boat surface quality is more, initial analysis is under the prerequisite that guarantees de-scaling pressure and de-scaling quality, heating, rolling and water-cooling process are to cause deck of boat surface to produce coarse key factor, for determining of the influence of each operation to deck of boat surface quality, solve the rough surface of ship plate problem, carry out a series of engineer testing, comprised different time inside furnaces and tapping temperature contrast test, different finish to gauge and final cooling temperature contrast test.The result shows: the main technique factor that influences rough surface of ship plate is time inside furnace, tapping temperature, finishing temperature and final cooling temperature.Heating-up temperature surpasses 1260 ℃ or time inside furnace and surpasses 320min, and the rough surface problem is particularly serious; Finishing temperature is at 800-850 ℃, and surface of steel plate produces red iron scale uniformly, and cooling rear surface quality is better; Through the laminar flow cooling, final cooling temperature can be alleviated the rough surface of ship plate problem at 600-700 ℃, further improves deck of boat surface quality after the steel plate controlled rolling.
It is that heating-up temperature is too high or time inside furnace is longer that surface of steel plate produces coarse essence, the iron scale thickness of billet surface increases, after the thickness of iron scale surpasses 0.8mm, billet surface can produce the oxidation non-uniform phenomenon, and this uneven surfaces oxidation can't eliminate in the follow-up operation of rolling fully; Reduce finishing temperature, and take the laminar flow cooling that the surface of steel plate temperature is reduced, alleviated the degree of oxidation that rolls the back steel plate, can alleviate the influence that the inhomogeneous oxidation of billet surface causes to surface of steel plate, further improve the surface quality of steel plate.
According to result of the test and theory analysis, determined to be suitable for the process window of produced on-site, invented a new technology that can solve rough surface of ship plate, also improved the surface quality of the deck of boat simultaneously comprehensively.The steel rolling process parameter is as shown in table 1 below.
Heating process control tapping temperature is that 180-320min, firing rate are at 1.0～1.2mm/min at 1200-1260 ℃, time inside furnace; The operation of rolling adopts austenite recrystallization district and the two stages controlled rolling of austenite non-recrystallization district, guarantees that austenite non-recrystallization district finishing temperature is at 800-850 ℃; Cooling procedure adopts the laminar flow cooling to be improved surface quality, controls final cooling temperature at 600-700 ℃, 10～8 ℃/s of cooldown rate.
Table 1. guarantees that shaggy steel rolling process does not appear in steel plate
| Tapping temperature/℃ | Time inside furnace/min | Finishing temperature/℃ | Final cooling temperature/℃ |
| ??1200-1260 | ??180-320 | ??800-850 | ??600-700 |
The invention has the beneficial effects as follows: the present invention has been successfully applied to and has solved deck of boat surface quality problems at present, the rough surface of ship plate problem has obtained effective solution, steel plate ball blast rear surface pattern as shown in Figure 2, deck of boat surface quality has obtained the improvement of matter, has improved the product quality and the market competitiveness.
Description of drawings
Fig. 1 is for existing the surface of steel plate pattern of coarse defective through strong illumination; There is not the surface of steel plate pattern of coarse defective after carrying out in Fig. 2 for new technology.
The specific embodiment
In conjunction with a large amount of result of the tests, having formulated a cover improves the process system of deck of boat surface quality and guarantees the stable relevant regulations of carrying out of process system, emphasis has carried out clear and definite requirement to heating, rolling and water-cooling process system, and improve constantly operating personnel's operant level, guarantee that technology can access stable the execution.Data representative in the production process are as shown in table 2, and time inside furnace is owing to influenced by rhythm of production, and it is bigger to fluctuate, and tapping temperature, finishing temperature, final cooling temperature can both be carried out according to the center line of technological requirement basically.This process system has obtained extensive popularization at present, and deck of boat surface quality has obtained the approval and the favorable comment of shipyard.
Representative data in table 2. production process
| Steel grade | Thickness | Tapping temperature/℃ | Time inside furnace/min | Finishing temperature/℃ | Final cooling temperature/℃ |
| ??B | ??12 | ??1230 | ??183 | ??824 | ??680 |
| ??B | ??25 | ??1238 | ??265 | ??827 | ??660 |
| ??B | ??40 | ??1240 | ??318 | ??830 | ??659 |
| ??A32 | ??12 | ??1235 | ??187 | ??821 | ??678 |
| ??A32 | ??25 | ??1248 | ??265 | ??819 | ??668 |
| ??A32 | ??40 | ??1226 | ??315 | ??823 | ??676 |
| ??A36 | ??12 | ??1253 | ??187 | ??835 | ??680 |
| ??A36 | ??25 | ??1247 | ??265 | ??826 | ??674 |
| ??A36 | ??40 | ??1232 | ??315 | ??829 | ??663 |
Claims (1)
1. a method that is used to solve rough surface of ship plate is characterized in that, this method comprises:
(1) heating process: the steel billet tapping temperature is 180-320min at 1200-1260 ℃, time inside furnace, and firing rate is controlled at 1.0～1.2mm/min;
(2) rolling mill practice: adopt austenite recrystallization district and austenite non-recrystallization district two stages controlled rolling rolling mode to adopt the polylith cover to roll, guarantee that austenite non-recrystallization district finishing temperature is at 800-850 ℃;
(3) roll the back process for cooling: adopt the laminar flow cooling, final cooling temperature is at 600-700 ℃, 10～8 ℃/s of cooldown rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910093662A CN101691001A (en) | 2009-09-25 | 2009-09-25 | Method for solving problem of rough surface of ship plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910093662A CN101691001A (en) | 2009-09-25 | 2009-09-25 | Method for solving problem of rough surface of ship plate |
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| CN101691001A true CN101691001A (en) | 2010-04-07 |
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| CN200910093662A Pending CN101691001A (en) | 2009-09-25 | 2009-09-25 | Method for solving problem of rough surface of ship plate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989785A (en) * | 2012-12-17 | 2013-03-27 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
| 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 |
| CN103506382A (en) * | 2013-07-31 | 2014-01-15 | 秦皇岛首秦金属材料有限公司 | Production method for improving surface quality of thick-standard ship plate |
| CN103695763A (en) * | 2013-12-26 | 2014-04-02 | 秦皇岛首秦金属材料有限公司 | Method for improving steel plate surface quality by adopting low-temperature rolling |
-
2009
- 2009-09-25 CN CN200910093662A patent/CN101691001A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989785A (en) * | 2012-12-17 | 2013-03-27 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
| CN102989785B (en) * | 2012-12-17 | 2015-01-14 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
| 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 |
| CN103506382A (en) * | 2013-07-31 | 2014-01-15 | 秦皇岛首秦金属材料有限公司 | Production method for improving surface quality of thick-standard ship plate |
| CN103506382B (en) * | 2013-07-31 | 2016-03-02 | 秦皇岛首秦金属材料有限公司 | A kind of production method improving surface quality of thick-standard ship plate |
| CN103695763A (en) * | 2013-12-26 | 2014-04-02 | 秦皇岛首秦金属材料有限公司 | Method for improving steel plate surface quality by adopting low-temperature rolling |
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Open date: 20100407 |