CN102848135A - Production method of super-thick steel plate with even performance in thickness direction - Google Patents
Production method of super-thick steel plate with even performance in thickness direction Download PDFInfo
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- CN102848135A CN102848135A CN 201110179993 CN201110179993A CN102848135A CN 102848135 A CN102848135 A CN 102848135A CN 201110179993 CN201110179993 CN 201110179993 CN 201110179993 A CN201110179993 A CN 201110179993A CN 102848135 A CN102848135 A CN 102848135A
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Abstract
The invention provides a production method of a super-thick steel plate with even performance in the thickness direction. The plate is rolled by a pair of female blanks after vacuum welding. Continuous castings are adopted for the female blanks, the welding surfaces of the female blanks are lower surfaces of the continuous castings, and the roughness is larger than 6.3mum; and vacuum composite blanks are heated and rolled, high-temperature large screw-down rolling is adopted for the first three passes, for composite blanks with widths smaller than 1650mm, all the screw-down rates for the first three passes are >=10%, for composite blanks with widths larger than 1650mm, the screw-down rate for the first pass is >=5%, and the screw-down rates for the second and third passes are >=10%. According to the plate, the source and the size of the female blanks are wide, the quality is stable, defects such as segregation and loosening in the middle of finished steel plates are overcome, the rolling yield is high, the performance of the steel plate is even in the thickness direction, and the Z-directional performance can reach above 35%.
Description
Technical field
(production technical field of 300mm 〉=h 〉=100mm) relates in particular to the production method of performance and the uniform steel plate of metallurgical quality requirement on a kind of thickness direction to the invention belongs to the metallurgy industry super-thick steel plate.
Background technology
General method with continuous casting is produced steel plate, can produce thickness less than the steel plate of 100mm with the continuous casting steel billet of different-thickness.But because the continuous casting billet center exists segregation, the defective such as loose in process of setting, and these defectives can't obtain larger improvement in follow-up technique.This worsens the uniformity of steel plate thickness direction, and serviceability descends.
Large-scale static ingot can be produced thicker steel plate, but because the static ingot metallurgical quality is more very different than continuous casting steel billet, produce high-quality slab, only has the substance and the thickness that increase steel ingot, adopt large compression ratio, reduce the impact of internal flaw, but substance is larger, the frequency that its defective produces is also just higher, and this can cause the decline of flaw detection qualification rate and performance simultaneously.
The defectives such as the segregation of electroslag remelting technique in can the elimination steel ingot, loose and shrinkage cavity, its product high purity, fine and close, the smooth surface of crystalline structure.But owing to problems such as power consumption are large, seriously polluted, this technology only is fit to the production of the medium-sized and large forgings of little in batches high-quality.
The Chinese patent (CN101876000A) of " a kind of method of producing high-toughness ultra-thick plate by using continuous casting blank " by name discloses a kind of controlled rolling, the cold Q345E-Z25 steel plate that adds normalizing process production of control, thickness range 100～130mm, and Z-direction only reaches 25% level.
The Chinese patent (CN101914665A) of " a kind of process for producing thick plate of plastic die steel " by name discloses a kind of employing open-close type water cooled die casting machine and has poured into a mould rolling plastic die steel production technology, this technique is without shrinkage cavity and pore, yield rate is high, but only is fit to the production of many kinds, small lot.
After the Chinese patent (CN101590596A) of " a kind of method of manufacturing extra-thick plate blank by accumulative roller welding process " by name discloses and has used the continuous casting billet surface treatment of same size composition of the same race, weld seam welded closure in a vacuum all around, the pressure processing compression ratio is 2, and the superposed surfaces tissue is identical with matrix.The Chinese patent (CN10439348A) of " a kind of process of producing special heavy plate " by name discloses the technique of using mechanical whole base, vacuum electron beam sealing side seam assembly, temperature control hot rolling to produce special heavy plate.This process has solved center segregation and loose problem with respect to die casting.General steel plate only requires the mechanical property at 1/4 place, but special heavy plate is used in engineering and is not only required 1/4 place's performance, and require 1/2 place's performance, namely requiring on thickness direction performance is uniformly, but the process route of above two patents does not all provide solution to the homogeneity question of the performance on the thickness direction.
Summary of the invention
The object of the invention is to overcome the existing deficiency of above-mentioned prior art, the even super-thick steel plate of a kind of thickness directional properties (100～300mm) production method is provided.
The even super-thick steel plate of thickness directional properties of the present invention is by with a pair of female base rolling forming after vacuum welding.Concrete grammar is as follows:
Described female base adopts the continuous casting mode to produce, during the continuous casting billet stacking, and the useless base place mat of orlop, the superiors depress with useless base, and continuous casting billet also is that the upper and lower surface flatness of female base should be greater than 1.0mm/m
2The solder side of female base must be the lower surface of former continuous casting billet, and female base needs removing surface, scale removal, and make the solder side surface roughness greater than 6.3 μ m.
For preventing that oxidative phenomena from occuring, to weld at vacuum chamber immediately after female base surface treatment, described welding booth vacuum is less than 1 * 10
-1Pa, weldingvoltage 50～150KV, welding current 30～300mA, speed of welding 100～600mm/min.
Composite billet after the welding is rolled after heating, rolls rear air cooling, also can carry out modified or normalized treatment, so that the structure refinement of finished steel plate.The rolling previous three passes of described vacuum composite billet adopts high temperature to depress greatly mode, not only can improve original segregation of continuous casting billet heart section, the defective such as loose, and by strengthening the infiltration of roll-force, can guarantee the fully healing of composite surface.Require the reduction ratio of previous three passes 〉=10% for width less than the composite billet of 1650mm; For the composite billet of width greater than 1650mm, the reduction ratio of the first passage requires 〉=5%, but the reduction ratio of two passages subsequently answers 〉=10%.Necessary, it is rolling to carry out two-stage control for thickness less than the composite billet of 300mm, and the rolling finishing temperature of phase I recrystallization should be greater than 950 ℃; Second stage is that non-recrystallization is rolling.
In the operation of rolling, when steel plate thickness during greater than 300mm, upwarp end to end for preventing composite billet, processings of spraying water of the lower surface of reply steel plate, rolling smoothly to guarantee, the thickness of steel plate be rolled down to 300mm following after, can stop to spray water.
The present invention used female base source and size are extensive, steady quality; Finished steel plate center zero defect, lumber recovery is high; Because the rolling penetration power at composite billet 1/4 place is much larger than the center of composite billet, so segregation and the defective such as loose have obtained very big improvement.The steel plate that adopts the present invention to produce, ultrasound examination reaches JB/T4730.3-2005 standard I level level, EN10160 standard S3E4 level and ASTM A 578-96 standard C level level, and combination property is good; Performance at the thickness direction upper steel plate is even, and the Z-direction performance reaches more than 35%.
Description of drawings
Fig. 1 is the macroscopic examination schematic diagram of the embodiment of the invention 2 steel plates.
Fig. 2 is the surface texture of the embodiment of the invention 2 steel plates.
Fig. 3 is the embodiment of the invention 2 steel plates 1/4 place tissue.
Fig. 4 is the embodiment of the invention 2 steel plate core structures.
The specific embodiment
The present invention is further described by the following embodiment.
Embodiment 1
Produce penstock low-welding crack-sensitive yield strength 490MPa grade high-strength steel, be welded into the 290mm composite billet with 2 blocks of thick continuous casting billets of 150mm, solder side is selected the lower surface of former continuous casting billet, and surface roughness reaches more than the 6.3 μ m, and the upper and lower surface flatness is 0.5mm/m
2, the composite billet width is 1600mm.Use vacuum electron beam welding, welding vacuum≤3.7 * 10
-2Pa, weldingvoltage 80KV, welding current 80～100mA, speed of welding 200mm/min; Two-stage control is rolled into the 150mm steel plate, 1150 ℃ of phase I start rolling temperatures, and finish to gauge is more than 980 ℃, and the drafts of front 3 passages is respectively 10%, 10%, 11%.930 ℃ of secondary open rollings, 800 ℃ of finish to gauges are rolled by modifier treatment, quench 930 ℃ 600 ℃ of tempering.Its composition sees Table 1, and mechanical property sees Table 2.
Embodiment 2
Be welded into the 580mm composite billet with two blocks of thick Q235B continuous casting billets of 300mm, solder side is selected the lower surface of former continuous casting billet, and surface roughness reaches more than the 6.3 μ m, and the upper and lower surface flatness is 0.5mm/m
2, the composite billet width is 1800mm.Use vacuum electron beam welding, welding vacuum≤2 * 10
-2Pa, weldingvoltage 80KV, welding current 80～100mA, speed of welding 240mm/min; Be rolled into the 250mm steel plate, 1150 ℃ of start rolling temperatures, the drafts of front 3 passages is respectively 6%, 10%, 11%.850 ℃ of finish to gauges, operation of rolling light plate thickness are during greater than 300mm, and its bottom surface keeps watering, and rolls rear air cooling.Its composition sees Table 1, and mechanical property sees Table 2.
Table 1 embodiment of the invention steel chemical composition (wt%)
Table 2 embodiment of the invention room temperature (20 ℃) mechanical property
* impact temperature is-15 ℃.
Claims (6)
1. the production method of the even super-thick steel plate of thickness directional properties is characterized in that a pair of female base rolling forming after vacuum welding; Described female base adopts continuous casting billet, and the solder side of female base is the lower surface of continuous casting billet, and the solder side roughness is greater than 6.3 μ m; Be rolled after the heating of vacuum composite billet, the previous three passes employing is depressed greatly rolling, to the composite billet of width less than 1650mm, the reduction ratio of previous three passes all 〉=10%, to the composite billet of width greater than 1650mm, the reduction ratio of the reduction ratio of the first passage 〉=5%, two, three passages all 〉=10%.
2. the production method of super-thick steel plate according to claim 1 is characterized in that the upper and lower surface flatness of described female base is greater than 1.0mm/m
2
3. the production method of super-thick steel plate according to claim 1 is characterized in that described vacuum welding carries out in vacuum chamber, the vacuum of welding booth is less than 1 * 10
-1Pa, weldingvoltage 50～150KV, welding current 30～300mA, speed of welding 100～600mm/min.
4. the production method of super-thick steel plate according to claim 1, it is rolling to it is characterized in that thickness is carried out two-stage control less than the composite billet of 300mm, and the rolling finishing temperature of phase I recrystallization is greater than 950 ℃; Second stage is that non-recrystallization is rolling.
5. the production method of super-thick steel plate according to claim 1 is characterized in that in the described operation of rolling, and steel plate thickness is during greater than 300mm, to the processing of spraying water of the lower surface of steel plate.
6. the production method of super-thick steel plate according to claim 1 is characterized in that cold, the modified or normalized treatment of the laggard line space of described steel plate rolling.
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| CN 201110179993 CN102848135A (en) | 2011-06-28 | 2011-06-28 | Production method of super-thick steel plate with even performance in thickness direction |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649123A (en) * | 2011-02-25 | 2012-08-29 | 宝山钢铁股份有限公司 | Method for producing extra thick composite board through dissymmetrical composite rolling |
| CN105274433A (en) * | 2014-07-16 | 2016-01-27 | 鞍钢股份有限公司 | Super-thick steel plate and composite production method thereof |
| CN105312842A (en) * | 2014-07-16 | 2016-02-10 | 鞍钢股份有限公司 | Manufacturing method of extra-thick steel plate with good Z-direction performance |
| CN106216947A (en) * | 2016-07-26 | 2016-12-14 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness flaw detection steel plate |
| CN106311746A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | Production method for super-thick steel plate |
| CN107326164A (en) * | 2017-05-23 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 690MPa high strength steel plates |
| CN107541664A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of X80 levels think gauge pipeline steel composite board and its manufacture method |
| CN107541658A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of X70 levels think gauge pipeline steel composite board and its manufacture method |
| CN107537859A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of X65 levels think gauge pipeline steel composite board and its manufacture method |
| CN108247297A (en) * | 2018-01-17 | 2018-07-06 | 山东钢铁集团日照有限公司 | The preparation process of the compound strand of high tenacity steel plate |
| CN109365529A (en) * | 2018-10-08 | 2019-02-22 | 鞍钢股份有限公司 | A kind of production method of austenitic stainless steel cut deal |
| CN109693072A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of 825/X70/825 double-sided composite plate and its production method |
| CN111926162A (en) * | 2020-07-13 | 2020-11-13 | 首钢集团有限公司 | Super-thick steel plate with excellent performance and preparation method thereof |
-
2011
- 2011-06-28 CN CN 201110179993 patent/CN102848135A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649123B (en) * | 2011-02-25 | 2015-04-22 | 宝山钢铁股份有限公司 | Method for producing extra thick composite board through dissymmetrical composite rolling |
| CN102649123A (en) * | 2011-02-25 | 2012-08-29 | 宝山钢铁股份有限公司 | Method for producing extra thick composite board through dissymmetrical composite rolling |
| CN105274433A (en) * | 2014-07-16 | 2016-01-27 | 鞍钢股份有限公司 | Super-thick steel plate and composite production method thereof |
| CN105312842A (en) * | 2014-07-16 | 2016-02-10 | 鞍钢股份有限公司 | Manufacturing method of extra-thick steel plate with good Z-direction performance |
| CN106311746A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | Production method for super-thick steel plate |
| CN107537859A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of X65 levels think gauge pipeline steel composite board and its manufacture method |
| CN107541664A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of X80 levels think gauge pipeline steel composite board and its manufacture method |
| CN107541658A (en) * | 2016-06-28 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of X70 levels think gauge pipeline steel composite board and its manufacture method |
| CN107537859B (en) * | 2016-06-28 | 2019-10-25 | 宝山钢铁股份有限公司 | A kind of X65 grades of think gauge pipeline steel composite board and its manufacturing method |
| CN106216947A (en) * | 2016-07-26 | 2016-12-14 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness flaw detection steel plate |
| CN107326164A (en) * | 2017-05-23 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 690MPa high strength steel plates |
| CN109693072A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of 825/X70/825 double-sided composite plate and its production method |
| CN108247297A (en) * | 2018-01-17 | 2018-07-06 | 山东钢铁集团日照有限公司 | The preparation process of the compound strand of high tenacity steel plate |
| CN109365529A (en) * | 2018-10-08 | 2019-02-22 | 鞍钢股份有限公司 | A kind of production method of austenitic stainless steel cut deal |
| CN111926162A (en) * | 2020-07-13 | 2020-11-13 | 首钢集团有限公司 | Super-thick steel plate with excellent performance and preparation method thereof |
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Application publication date: 20130102 |