CN109158432A - A kind of milling method promoting rear bloom consistency under convex roll-in - Google Patents
A kind of milling method promoting rear bloom consistency under convex roll-in Download PDFInfo
- Publication number
- CN109158432A CN109158432A CN201811030011.9A CN201811030011A CN109158432A CN 109158432 A CN109158432 A CN 109158432A CN 201811030011 A CN201811030011 A CN 201811030011A CN 109158432 A CN109158432 A CN 109158432A
- Authority
- CN
- China
- Prior art keywords
- rolling
- bloom
- milling method
- convex roll
- under convex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The present invention relates to a kind of milling methods, and in particular to a kind of milling method for promoting rear bloom consistency under convex roll-in.Technical scheme is as follows: a kind of milling method promoting rear bloom consistency under convex roll-in, control slab start rolling temperature are 1100 DEG C~1200 DEG C；When roughing, the first passage rolling direction is transverse rolling, and roughing rolling pass is 11 times.The milling method provided by the invention for promoting rear bloom consistency under convex roll-in, can be obviously improved the center porosity of rolled blank, improve the central dense degree of rolled blank.
Description
Technical field
The present invention relates to a kind of milling methods, and in particular to a kind of rolling side for promoting rear bloom consistency under convex roll-in
Method.
Background technique
Implementing weight soft reduction process in solidification end during bloom continuous casting can significantly improve slab central pipe, loose
The defects of.It needs for pulling-straightening roller to transform convex roller as before implementing weight soft reduction process, being implemented with it can be in slab table after technique under weight
Face forms a depth and is greater than 10mm groove, as shown in Figure 1.This reeded bloom of band, i.e. referred to as concave base, are rolling
During system, since the boss on groove two sides does not obtain effective support of depressed central region, cause in the subsequent operation of rolling
Concave parison center mass defect can not be effectively improved, and should as early as possible be offseted groove in rough rolling process.
Patent application CN201410414400.7 " the rolling mill practice method of ultra-thin ultra-wide steel plate " guarantees steel-pushing type heating
Furnace soaking temperature is controlled at 1200-1250 DEG C, guarantees soaking zone time >=60 minute, and steel billet head and tail temperature difference is less than or equal to 30 DEG C；
Dogbone rolling is respectively adopted in last a time of roughing shaping stage and broadening stage；Support roller is edge with the flat of chamfering
The lower roller diameter of roller roll shape working roll is greater than the upper roller diameter 2-5mm of working roll；Manipulator differs within 10mm moderate；Roughing
Machine rolling pass carries out control finish rolling according to the road 8-10 and is rolled according to 6-8 passage, and the pressure of last three passage gradually reduces
The reduction ratio of last three passage of finish rolling is controlled in 10%-15%；It is aligned using two 11 roller straighteners.The main needle of the method
To the rolling mill practice of ultra-thin ultra-wide steel plate, rolling mill practice for concave base is simultaneously not suitable for.
A kind of patent application CN201410298490.8 " rolling work for controlling the gren rod decarburization of 42CrMo steel bloom
42CrMo steel bloom is carried out cogging, controls temperature, time and the remaining oxygen of cogging heating furnace by skill "；Steel billet after cogging into
Row reconditioning, thinning surface and corner；It is rolled again, rolling Heating Furnace Control temperature, time, remaining oxygen and every steel billet stop
Time；Roughing temperature is 980~1020 DEG C when rolling, and final rolling temperature is 900 DEG C, and laying temperature is 850 DEG C；To be greater than 5 after rolling
The cooling rate of~15 DEG C/S is quickly cooled down 600 DEG C~650 DEG C, and heat preservation is rolled up to 300~350 DEG C or so collection, roller table speed control
In 0.4~0.5m/s, mainly for conventional bloom, but to the rolling mill practice of concave base and be not suitable for.
Summary of the invention
The present invention provides a kind of milling method of bloom consistency after being promoted under convex roll-in, can be obviously improved rolled blank
Center porosity, improve the central dense degree of rolled blank.
Technical scheme is as follows: a kind of milling method promoting rear bloom consistency under convex roll-in, control casting
Base start rolling temperature is 1100 DEG C~1200 DEG C；When roughing, the first passage rolling direction is transverse rolling, and roughing rolling pass is 11 times.
The invention has the benefit that
1, the control of slab start rolling temperature can prevent temperature is too low can not generate effective pressure at 1100~1200 DEG C, and
Temperature is excessively high to generate burn-off phenomenon.
2, when roughing, the first passage rolling direction is transverse rolling, can first be offseted the groove of slab, so that subsequent rolling
Slab is integrally effectively supported in the process, reduces slab central defect.
3, roughing rolling pass is 11 times, can cooperate the change of the first passage rolling direction, enable existing milling train
Complete rolling.
4, by control start rolling temperature, improvement roughing rolling pattern, the center porosity that can reduce rolled blank lacks the present invention
It falls into, improves its internal soundness, and then improve its center consistency, the requirement of large-size round steel can be met well.
Detailed description of the invention
Fig. 1 is concave base cross-sectional view.
Specific embodiment
Comparative example 1
Concave base is rolled using pair rolling technique:
Continuous casting billet has the groove of 13mm depth, steel grade 45#, through excessively high having a size of 320mm × 425mm, the wide face of continuous casting billet
Pressing start rolling temperature after water removal scale on surface is 1113 DEG C, and pair rolling system shown in the following table 1 is used in the operation of rolling,
Round steel is rolled by finish rolling again, milling round steel specification is 150mm.
The conventional roughing rolling pattern of table 1
After rolling, macroscopic examination is sampled and carried out to 45# steel round steel, to be detected to round steel internal soundness, inspection
Look into the result shows that, round steel transverse direction low power center porosity defect is rated 1.5 grades, without obvious crackle, the loose width of round steel longitudinal direction low power
Degree is 60mm, carries out ultrasonic examination detection to round steel, testing result ultrasonic flaw detection qualification rate is 80%.
Embodiment 1
Concave base is rolled using a kind of milling method of bloom consistency after promoted under convex roll-in:
Continuous casting billet has the groove of 13mm depth, steel grade 45#, through excessively high having a size of 320mm × 425mm, the wide face of continuous casting billet
Pressing start rolling temperature after water removal scale on surface is 1127 DEG C, using rolling pattern shown in the following table 2 in the operation of rolling, then is led to
It crosses finish rolling and rolls into round steel, milling round steel specification is 150mm.
Roughing rolling pattern after table 2 improves
After rolling, macroscopic examination is sampled and carried out to 45# steel round steel, to be detected to round steel internal soundness, inspection
Look into the result shows that, for round steel transverse direction low power without obvious shrinkage porosite, centre burst defect, low power loose width in round steel longitudinal direction is 30mm, right
Round steel carries out ultrasonic examination detection, and testing result ultrasonic flaw detection qualification rate is 100%.
Embodiment 2
Concave base is rolled using a kind of milling method of bloom consistency after promoted under convex roll-in:
Continuous casting billet has the groove of 12mm depth, steel grade 45#, through excessively high having a size of 320mm × 425mm, the wide face of continuous casting billet
Pressing start rolling temperature after water removal scale on surface is 1150 DEG C, using rolling pattern shown in table 2 in the operation of rolling, then is passed through
Finish rolling rolls into round steel, and milling round steel specification is 150mm.
After rolling, macroscopic examination is sampled and carried out to 45# steel round steel, to be detected to round steel internal soundness, inspection
Look into the result shows that, for round steel transverse direction low power without obvious shrinkage porosite, centre burst defect, low power loose width in round steel longitudinal direction is 28mm, right
Round steel carries out ultrasonic examination detection, and testing result ultrasonic flaw detection qualification rate is 100%.
Embodiment 3
Concave base is rolled using a kind of milling method of bloom consistency after promoted under convex roll-in:
Continuous casting billet has the groove of 15mm depth, steel grade 45#, through excessively high having a size of 320mm × 425mm, the wide face of continuous casting billet
Pressing start rolling temperature after water removal scale on surface is 1137 DEG C, using rolling pattern shown in table 2 in the operation of rolling, then is passed through
Finish rolling rolls into round steel, and milling round steel specification is 180mm.
After rolling, macroscopic examination is sampled and carried out to 45# steel round steel, to be detected to round steel internal soundness, inspection
Look into the result shows that, for round steel transverse direction low power without obvious shrinkage porosite, centre burst defect, low power loose width in round steel longitudinal direction is 40mm, right
Round steel carries out ultrasonic examination detection, and testing result ultrasonic flaw detection qualification rate is 100%.
It is compared by embodiment 1-3 and comparative example 1 it is found that bloom is fine and close after under the convex roll-in of a kind of promotion of the invention
The concave base of the milling method rolling of degree, center gas porosity are obviously reduced, and central dense degree significantly improves, and ultrasonic examination is closed
Lattice rate is 100%.
Claims (1)
1. a kind of milling method for promoting rear bloom consistency under convex roll-in, which is characterized in that controlling slab start rolling temperature is
1100 DEG C~1200 DEG C；When roughing, the first passage rolling direction is transverse rolling, and roughing rolling pass is 11 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811030011.9A CN109158432B (en) | 2018-09-05 | 2018-09-05 | Rolling method for improving compactness of bloom after pressing of convex roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811030011.9A CN109158432B (en) | 2018-09-05 | 2018-09-05 | Rolling method for improving compactness of bloom after pressing of convex roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109158432A true CN109158432A (en) | 2019-01-08 |
| CN109158432B CN109158432B (en) | 2020-04-03 |
Family
ID=64893912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811030011.9A Active CN109158432B (en) | 2018-09-05 | 2018-09-05 | Rolling method for improving compactness of bloom after pressing of convex roller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109158432B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284062A (en) * | 2019-06-29 | 2019-09-27 | 江阴兴澄特种钢铁有限公司 | It is a kind of with high-intensitive, the major diameter round steel of high tenacity and its manufacturing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264484A (en) * | 2008-04-25 | 2008-09-17 | 重庆钢铁(集团)有限责任公司 | Median plate high-speed rolling technique |
| CN102363210A (en) * | 2011-10-27 | 2012-02-29 | 南京钢铁股份有限公司 | Production process for 48MnV round steel |
| CN102941226A (en) * | 2012-10-12 | 2013-02-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Controlled rolling and cooling process for extra-thick plate with guaranteed cost |
| CN103045939A (en) * | 2012-12-27 | 2013-04-17 | 安阳钢铁股份有限公司 | Resource-saving Q345 low-alloy series steel plate and production method thereof |
| CN106216392A (en) * | 2016-07-19 | 2016-12-14 | 东北大学 | A kind of elimination cut deal piebaldism defects controlling method |
| CN106756618A (en) * | 2016-11-26 | 2017-05-31 | 江阴兴澄特种钢铁有限公司 | 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates |
-
2018
- 2018-09-05 CN CN201811030011.9A patent/CN109158432B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101264484A (en) * | 2008-04-25 | 2008-09-17 | 重庆钢铁(集团)有限责任公司 | Median plate high-speed rolling technique |
| CN102363210A (en) * | 2011-10-27 | 2012-02-29 | 南京钢铁股份有限公司 | Production process for 48MnV round steel |
| CN102941226A (en) * | 2012-10-12 | 2013-02-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Controlled rolling and cooling process for extra-thick plate with guaranteed cost |
| CN103045939A (en) * | 2012-12-27 | 2013-04-17 | 安阳钢铁股份有限公司 | Resource-saving Q345 low-alloy series steel plate and production method thereof |
| CN106216392A (en) * | 2016-07-19 | 2016-12-14 | 东北大学 | A kind of elimination cut deal piebaldism defects controlling method |
| CN106756618A (en) * | 2016-11-26 | 2017-05-31 | 江阴兴澄特种钢铁有限公司 | 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284062A (en) * | 2019-06-29 | 2019-09-27 | 江阴兴澄特种钢铁有限公司 | It is a kind of with high-intensitive, the major diameter round steel of high tenacity and its manufacturing method |
| CN110284062B (en) * | 2019-06-29 | 2022-01-14 | 江阴兴澄特种钢铁有限公司 | Large-diameter round steel with high strength and high toughness and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109158432B (en) | 2020-04-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101609174B1 (en) | Hot Rolled Silicon Steel Producing Method | |
| KR101516910B1 (en) | Pre-control method of head and tail shapes of continuous casting slab for reducing the removed amount from the head and tail of hot-rolled intermediate slab | |
| CN103831412B (en) | Production method for controlling straight crack defect of surface edge of medium-thick plate | |
| CN105665443B (en) | A kind of rolling mill practice of wide and heavy plate mill production Limit specifications pipe line steel | |
| CN108067501B (en) | Operation roll of mill curve design method suitable for bloom and the big pressure of rectangular bloom high temperature | |
| CN109604338B (en) | Manufacturing method for reducing width of hairline defect at edge of hot-rolled pipeline steel | |
| CN109647884B (en) | Method and device for producing middle plate by continuous casting and rolling without head | |
| CN109234495A (en) | A kind of low compression ratio height flaw detection requires the continuous casting manufacturing technique of SM4Gr2MnNi mold steel plate | |
| CN104148387B (en) | The hot core milling method of a kind of continuous casting | |
| CN110000221A (en) | A method of improving non-orientation silicon steel hot rolling flanging part threadiness upwarping defect | |
| CN110394363A (en) | It is a kind of to utilize Wide and Thick Slab finishing mill differential temperature rolling thickness >=60mm carbon constructional quality steel production method | |
| CN109158432A (en) | A kind of milling method promoting rear bloom consistency under convex roll-in | |
| CN100556564C (en) | The manufacture method of composite strip steel for wood blade | |
| CN109365527B (en) | Rolling method of wide and thick steel plate with large spreading ratio | |
| JP4899629B2 (en) | Billet continuous casting method | |
| CN113714280A (en) | Production process for improving microscopic pores of high-carbon chromium bearing steel 100Cr6 bar | |
| CN103831413B (en) | A kind of support roller device and method of band chamfering continuous casting billet being carried out to bight distortion | |
| CN112845609A (en) | Controlled rolling method for improving micro-pores on bearing steel core part | |
| CN109277542A (en) | High-carbon steel bloom corner crack control method | |
| CN101733619A (en) | Production technology of large round steel | |
| CN106216947A (en) | A kind of production method of big thickness flaw detection steel plate | |
| CN202377264U (en) | Vertical roller hole pattern for eliminating streaky peeling defect of edge part of stainless steel hot-rolled strip steel | |
| CN201791735U (en) | Slab sizing press module | |
| CN110153346A (en) | A kind of method of the forging rolling duplex technique production long material of steel alloy big cross section | |
| CN209773063U (en) | Device for producing high-quality medium plate by endless continuous casting and rolling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |