CN104136140A - Production method for steel product exhibiting excellent internal properties - Google Patents
Production method for steel product exhibiting excellent internal properties Download PDFInfo
- Publication number
- CN104136140A CN104136140A CN201380011180.7A CN201380011180A CN104136140A CN 104136140 A CN104136140 A CN 104136140A CN 201380011180 A CN201380011180 A CN 201380011180A CN 104136140 A CN104136140 A CN 104136140A
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- passage
- rolling
- hot rolling
- steel
- raw material
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 29
- 239000010959 steel Substances 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 230000001747 exhibiting effect Effects 0.000 title 1
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 238000005098 hot rolling Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 description 51
- 230000007547 defect Effects 0.000 description 32
- 238000002474 experimental method Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
-
- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
Abstract
When hot rolling a raw material having a circular cross section to obtain a steel product having a circular cross section, it has been, hitherto, difficult to modify the internal properties thereof by applying heavy reduction. When performing hot rolling at least 3 times on a steel raw material having a circular cross section to obtain a finished steel product having a circular cross section: a pair of flat rollers arranged above and below are used for the first time hot rolling is performed; a pair of homogeneous perforated rollers arranged above and below, or, a pair of heterogeneous perforated rollers arranged above and below are used for the second time hot rolling is performed and for every time up to and including the penultimate time hot rolling is performed; a pair of round perforated rollers arranged above and below are used the final time hot rolling is performed; and the percentage reduction in the first time hot rolling is performed is less than the total percentage reduction from the raw material to the finished product. It is preferable that the percentage reduction in the first time hot rolling is performed be at least 50% of the total percentage reduction from the second time hot rolling is performed onwards.
Description
Technical field
The present invention relates to the manufacture method of the steel that interior quality is good.
Background technology
In the raw-material situation of the circular section (also referred to as circular section) of rolling steel, finished product be also circular section conventionally, in this situation, and ellipse (ellipses that use conventionally more; Contracted notation O)-circle (circle; Contracted notation R) the pass series that is.On the contrary, in stock material shapes be cubic in the situation that, utilize have square (square; Contracted notation S) or box-like (hexagon; Contracted notation B)-rhombus (rhombus; Contracted notation D) hole type roll of diplodal dwindles sectional area (specifically for cross-sectional area.Identical below), finally make desirable shape.The combination (non-patent literature 1) of certainly,, if raw material are cubic cross section, also use square (S)-ellipse (O) etc.In addition, in Fig. 4 by the example of above-mentioned various pass shapes and plain-barreled roll (plain-barreled roll; Contracted notation F) shape represents together.In addition, Fig. 4 be by up-down rollers with they axial line in plane cut off and the profile that obtains.In Fig. 4, F/F means the contracted notation of the situation that is up and down plain-barreled roll, O/O represents to be up and down the contracted notation of the situation of elliptical aperture forming roll, R/R represents to be up and down the contracted notation of the situation of circular hole forming roll, S/S represents to be up and down the contracted notation of the situation of square opening forming roll, B/B represents to be up and down the contracted notation of the situation of box-like hole type roll, and D/D represents to be up and down the contracted notation (following identical) of the situation of diamond hole forming roll.
Now, in the situation that particularly stock material shapes or intermediate shape are circular, as mentioned above, by oval (O) or circle (R), manufacture the circular section raw material of net shape.
On the other hand, at raw material, for the situation of the steel billet of casting or in the situation that the remaining defect of steel billet kernel of section portion is such, as final finished or towards the raw material of other manufacturing line, be not suitable for.This is because due to remaining defect, become and caused the reason of flaw or it may be occurred take in follow-up rolling that to be starting point break etc. by further processing.Therefore,, when manufacturing finished product by the steel billet such as slab, as the method for eliminating the defect of raw material cross section central authorities by rolling, known have a gimmick (non-patent literature 2) of carrying out strong rolling.This for example when needs rolling 30mm, compares and is made as 10mm/ passage and minute is rolled for 3 times when manufacturing steel plate, and 1 time rolling 30mm can obtain the finished product that interior quality is good.
In addition, in patent documentation 1, record, as the milling method that prevents from casting continuously the rolling crack (the particularly rolling crack of side) of billet slab, when manufacturing steel bar from continuous casting billet slab by direct sending rolling, use the continuous manufacture billet slab of circular section, the 1st passage in thick roll forming passage is used hole type roll, in the roughing system after the 2nd passage, uses plain-barreled roll.
Prior art document
Patent documentation
Patent documentation 1: No. 3649054 communique of Japan Patent
Non-patent literature
Non-patent literature 1: Japanese plastic working association will, Vol.24-273 (1983.10) are p.1070-1077
Non-patent literature 2: iron and steel ' 81-S339
Summary of the invention
Invent problem to be solved
But, at raw material, be circular section, and then finished product is also in the such situation in circular section, the application that can in short show the technology of strong rolling may not be easy.This is because make cross-sectional area as raw-material steel billet or slab be reduced to Ratio of decreased area till the cross-sectional area of final finished (referred to as draft;=1-finished product area of section/raw material area of section), i.e. rolling rate is determined, and when manufacturing shape, necessary pass, rolling rate is limited to certain degree.Or increase in addition the method for raw material area of section, but correspondingly, change pass or make rolling rate optimization can expend plenty of time and labour, industrialness difficulty.In addition, manufactured in raw-material situation by mold, this restriction is also larger, in fact difficulty.As above-mentioned, conventionally, the in the situation that of rolling circular section, use roughly oval pass, if but by such pass, carry out strong rolling, from pass, produce overlap, its may be at the outer surface of finished product residual flaw.In addition, if rolling is not enough, even without overlap, in the outer surface of the final finished application difficult of the method based on strong rolling such as residual part of failing to be full of pass still, therefore, often can not fully meet interior quality and shape, this point becomes problem.
For solving the technical scheme of problem
In order to solve described problem, inventor inquires into following method, even in the situation that be generally obtain desirable finished form and in applying hot rollings more than 3 passages of groove rolling rolling rate may not be high also effectively obturation be present in the method for the defect at center, raw-material circular section, its result obtains following opinion, by only the 1st passage of described hot rolling being made as to upper and lower flat rolling, groove rolling will be made as after the 2nd passage, can easily apply the method based on strong rolling, obtain all sufficient finished products of interior quality and shape, completed the present invention who becomes following content structure.
; the invention provides the manufacture method of the steel that a kind of interior quality is good; it is characterized in that; when the circular section raw material to steel are implemented hot rollings more than 3 passages and are made circular section steel finished product; the 1st passage is used upper and lower a pair of plain-barreled roll; after the 2nd passage until final passage is used a pair of upper and lower of the same race or a pair of hole type roll not of the same race up and down before tight; final passage is used upper and lower a pair of circular hole forming roll, and the draft of the 1st passage is set in the scope that is less than the total draft from raw material to finished product and is rolled.In the present invention, preferably, the draft of described the 1st passage is the more than 50% of total draft after the 2nd passage.
Invention effect
According to the present invention, the defect that is present in center, circular section in the strong rolling that fully obturation is carried out at the plain-barreled roll up and down by the 1st passage, and the flattening based on described strong rolling cross section by compared with the groove rolling of saddening system and the fully sphering after the 2nd passage, therefore, can access the circular section steel that shape does not worsen and possess sufficient interior quality.
Accompanying drawing explanation
Fig. 1 means the line chart of roll shape on the example of the impact of the defect occlusion rate under 1 passage rolling and the dependency relation between draft (result of experiment 1);
Fig. 2 means the line chart of roll shape on the example of the impact of the defect occlusion rate under 1 passage rolling and the dependency relation between draft (result of experiment 2);
Fig. 3 means the line chart of roll shape on the example of the impact of the defect occlusion rate under 1 passage rolling and the dependency relation between draft (result of experiment 3);
Fig. 4 means the skeleton diagram of various pass shapes and plain-barreled roll shape.
The specific embodiment
As the clue of exploring the solution of above-mentioned problem, inventors have carried out experimental investigation to following content: to being provided with the circular section raw material of the artificial defect that penetrates into circular section central part, carried out defect occlusion rate (defect sectional area/material defects sectional area after=1-rolling) in the situation of 1 passage rolling and the dependency relation of draft (=1-mill product sectional area/raw material sectional area (comprising defect sectional area)) and can how to have changed according to used roll shape.In experiment, use plumbous raw material processed to carry out cold rolling.This is because because plumbous cold deformation movement approaches heat (1000～1200 ℃) the distortion movement of steel, in addition, plumbous normal temperature deformation drag demonstration and the thermal deformation resistance of steel be equal trend roughly, so can be used as good approximate employing.
(experiment 1)
In experiment 1,
the roll shape of up/down is 4 kinds of F/F, D/D, O/O, B/B (with reference to Fig. 4), and roller footpath is 5 times (wherein, the roller footpath of hole type roll is with diameter representatives of roller flange portion) of raw material diameter, in the scope of draft below 25% degree, various changes occurs.After rolling, defect area of section is obtained according to the defect photographic images in mill product cross section.In addition,, the in the situation that of not seeing defect in photographic images, the color check in the cross section that is taken test, confirms and soaks into not leaching (following identical) of liquid.
Fig. 1 represents result.What Fig. 1 represented is, no matter be any roll shape, defect occlusion rate all together increases with draft, but this increase trend particularly in the situation that of F/F than other situation sharply, in draft=21% left and right, reach entirely shut (defect occlusion rate=1), by having used the strong rolling of upper and lower plain-barreled roll, can significantly improve defect occlusion rate.
(experiment 2)
In experiment 2, remove
in addition, be the specification identical with experiment 1.Fig. 2 represents result.What Fig. 2 represented is, no matter be any roll shape, defect occlusion rate all together increases with draft, but this increase trend particularly in the situation that of F/F than other situation sharply, in draft=21% left and right, reach entirely shut (defect occlusion rate=1), by using the strong rolling of upper and lower plain-barreled roll, can significantly improve defect occlusion rate.
(experiment 3)
In experiment 3, remove
in addition, be the specification identical with experiment 1.Fig. 3 represents result.What Fig. 3 represented is, no matter be any roll shape, defect occlusion rate all together increases with draft, this increase trend particularly in the situation that of F/F than other situation sharply, in draft=9% left and right, reach entirely shut (defect occlusion rate=1), by using the strong rolling of upper and lower plain-barreled roll, can significantly improve defect occlusion rate.
Next, to applying the passage of F/F (upper and lower plain-barreled roll) rolling in the rolling pass more than 3 passages, inquire into, obtain as drawn a conclusion.That is, in F/F rolling, while carrying out this strong rolling in order to carry out strong rolling after the 2nd passage, if restricted to road number of times, from strong rolling pass till the groove rolling road number of times of final passage reduce, so be difficult to make final cross section sphering.If to the not restriction of road number of times, the sphering likely by appending groove rolling platform, but number of units increases, aspect rolling efficiency and the unfavorable increase of economic aspect.Therefore, F/F rolling should be only the 1st passage.
The draft of F/F rolling (the 1st passage) must be less than total draft of the regulation from raw material to finished product.At this, conventionally, from m passage, enter total draft that side goes out side (m < n) to n passage (by mark Z
m/nrepresent) according to m passage, enter the long-pending S in lateral section
m-1go out the long-pending S in lateral section with n passage
nand defined by formula (1).
Z
m/n＝1－S
n/S
m－1‥‥(1)
From raw material (the 1st passage enters side) to finished product (final N passage goes out side) in the situation that, in formula (1), set m=1, n=N, become formula (2).
Z
1/N＝1－S
N/S
0‥‥(2)
Use the lateral section that of i passage to amass S
i, draft z
i(=1-S
i/ S
i-1) by formula (2) distortion, become formula (3).
Z
1/N＝1-
iΠ
1/N(1-z
i)....(3)
Wherein,
iΠ
1/N(1-z
i) ≡ (1-z
1) (1-z
2) .... (1-z
n).
Raw material sectional area S
0with finished product target cross section S
nbe setting, therefore, the total draft Z from raw material to finished product
1/Nfor setting.If z
1>=Z
1/N,, according to formula (3), become 1-
iΠ
2/N(1-z
i)=Z
2/N≤ 0, can not carry out the groove rolling afterwards of the 2nd passage, cannot obtain the round cross section of target.Therefore, be necessary for z
1< Z
1/N.
On the other hand, if z
1be less than Z
2/N50%, do not become strong rolling, may lack the inaccessible effect of defect.If it is inaccessible to implement defect in the 1st passage, think remaining and only repair shape fully, therefore, the draft z of F/F rolling (the 1st passage)
1be preferably total draft Z of remaining groove rolling
2/Nmore than 50%.
Embodiment
To heating for examination material, describedly for examination material, at the raw-material kernel of section in the circular section of steel, as the artificial defect through hole (circular section) of having bored a hole, form, with various rolling conditions, carry out hot rolling, manufacture the steel of circular section target, whether defect occlusion rate and the shape of the steel that investigation obtains be good.The raw-material size (external diameter, defects with diameters) that table 1 represents to use, the target size (external diameter) of steel, from the 1st passage, enter side and to final N passage, go out total draft Z of side
1/Nand rolling condition (the draft z of full road times N, use roll shape (F/F → O/O ‥ ‥ → R/R etc.), the 1st passage
1, the total draft Z after the 2nd passage
2/N).In addition, heating-up temperature is made as 1100 ℃.The roller footpath of plain-barreled roll is made as 200mm, and the roller footpath of hole type roll (the roller footpath of flange end) is made as 200mm.Final passage goes out side temperature than low 50～100 ℃ of left and right of heating-up temperature.
The defect occlusion rate of the steel that obtain is investigated with the main points identical with above-mentioned experiment.With regard to whether shape good, measure circumferencial direction path/maximum diameter be compared to circularity index, if this circularity index is more than 0.975, be judged to be well (zero), situation is in addition judged to be bad (*).Table 1 represents this result.
According to table 1, in the inventive example, (only the 1st passage is F/F and z
1< Z
1/N=in, defect is entirely shut, and shape is also good.
[table 1]
Claims (2)
1. a manufacture method for the steel that interior quality is good, is characterized in that,
When the circular section raw material to steel are implemented hot rollings more than 3 passages and are made circular section steel finished product, the 1st passage is used upper and lower a pair of plain-barreled roll, after the 2nd passage until final passage is used a pair of upper and lower of the same race or a pair of hole type roll not of the same race up and down before tight, final passage is used upper and lower a pair of circular hole forming roll, and the draft of the 1st passage is set in the scope that is less than the total draft from raw material to finished product and is rolled.
2. the manufacture method of the steel that interior quality according to claim 1 is good, is characterized in that,
The draft of described the 1st passage is the more than 50% of total draft after the 2nd passage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012043682A JP2013180302A (en) | 2012-02-29 | 2012-02-29 | Method for manufacturing steel excellent in inner quality |
| JP2012-043682 | 2012-02-29 | ||
| PCT/JP2013/053626 WO2013129128A1 (en) | 2012-02-29 | 2013-02-15 | Production method for steel product exhibiting excellent internal properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104136140A true CN104136140A (en) | 2014-11-05 |
Family
ID=49082330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380011180.7A Pending CN104136140A (en) | 2012-02-29 | 2013-02-15 | Production method for steel product exhibiting excellent internal properties |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20150027191A1 (en) |
| EP (1) | EP2821152A4 (en) |
| JP (1) | JP2013180302A (en) |
| CN (1) | CN104136140A (en) |
| AR (1) | AR090170A1 (en) |
| WO (1) | WO2013129128A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58132303A (en) * | 1982-02-03 | 1983-08-06 | Nippon Steel Corp | Rolling method of continuous casting ingot having trapezoidal sectional shape |
| JPS58188502A (en) * | 1982-04-30 | 1983-11-04 | Sumitomo Metal Ind Ltd | Rolling method of round billet |
| CN1035452A (en) * | 1988-02-29 | 1989-09-13 | 石川岛播磨重工业株式会社 | The method of processing axle |
| JPH03207501A (en) * | 1990-01-10 | 1991-09-10 | Hitachi Cable Ltd | Manufacture of shape steel with large-sized rectangular cross section |
| US6092586A (en) * | 1996-03-28 | 2000-07-25 | Mannesmann Ag | Method and arrangement for producing hot-rolled steel strip |
| CN101318197A (en) * | 2008-07-11 | 2008-12-10 | 河北理工大学 | Forcedly stretching hole structure and stretching rolling method for rolling strip steel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE399521B (en) * | 1974-09-24 | 1978-02-20 | Metalform Ab | SET THAT IN A SEVERAL STICK ROLL A ONE METAL ITEM |
| AT407230B (en) * | 1996-02-20 | 2001-01-25 | Gfm Gmbh | METHOD FOR PRODUCING METAL ROD MATERIAL |
| AT406644B (en) * | 1997-11-14 | 2000-07-25 | Voest Alpine Ind Anlagen | PRECISION ROLLING METHOD |
| US7154563B1 (en) * | 1998-04-30 | 2006-12-26 | Stmicroelectronics Asia Pacific Pte Ltd. | Automatic brightness limitation for avoiding video signal clipping |
| US6003354A (en) * | 1998-12-22 | 1999-12-21 | Danieli United, A Division Of Danieli Corporation | Extrusion rolling method and apparatus |
| JP3649054B2 (en) | 1999-09-14 | 2005-05-18 | Ｊｆｅスチール株式会社 | Rolling method to prevent rolling cracks in continuously cast billet slabs |
-
2012
- 2012-02-29 JP JP2012043682A patent/JP2013180302A/en active Pending
-
2013
- 2013-02-15 CN CN201380011180.7A patent/CN104136140A/en active Pending
- 2013-02-15 EP EP13754965.5A patent/EP2821152A4/en not_active Withdrawn
- 2013-02-15 WO PCT/JP2013/053626 patent/WO2013129128A1/en active Application Filing
- 2013-02-15 US US14/382,097 patent/US20150027191A1/en not_active Abandoned
- 2013-02-27 AR ARP130100597A patent/AR090170A1/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58132303A (en) * | 1982-02-03 | 1983-08-06 | Nippon Steel Corp | Rolling method of continuous casting ingot having trapezoidal sectional shape |
| JPS58188502A (en) * | 1982-04-30 | 1983-11-04 | Sumitomo Metal Ind Ltd | Rolling method of round billet |
| CN1035452A (en) * | 1988-02-29 | 1989-09-13 | 石川岛播磨重工业株式会社 | The method of processing axle |
| JPH03207501A (en) * | 1990-01-10 | 1991-09-10 | Hitachi Cable Ltd | Manufacture of shape steel with large-sized rectangular cross section |
| US6092586A (en) * | 1996-03-28 | 2000-07-25 | Mannesmann Ag | Method and arrangement for producing hot-rolled steel strip |
| CN101318197A (en) * | 2008-07-11 | 2008-12-10 | 河北理工大学 | Forcedly stretching hole structure and stretching rolling method for rolling strip steel |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2821152A4 (en) | 2015-03-18 |
| EP2821152A1 (en) | 2015-01-07 |
| US20150027191A1 (en) | 2015-01-29 |
| JP2013180302A (en) | 2013-09-12 |
| WO2013129128A1 (en) | 2013-09-06 |
| AR090170A1 (en) | 2014-10-22 |
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| C06 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141105 |
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| RJ01 | Rejection of invention patent application after publication |