CN102649123B - Method for producing extra thick composite board through dissymmetrical composite rolling - Google Patents

Method for producing extra thick composite board through dissymmetrical composite rolling Download PDF

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CN102649123B
CN102649123B CN201110045798.8A CN201110045798A CN102649123B CN 102649123 B CN102649123 B CN 102649123B CN 201110045798 A CN201110045798 A CN 201110045798A CN 102649123 B CN102649123 B CN 102649123B
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slab
rolling
thickness
temperature
composite
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CN102649123A (en
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袁向前
苗雨川
焦四海
白岩
鲁志政
孔伟
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

A method for producing extra thick composite board through dissymmetrical composite rolling comprises the following steps: a), board preparation: three slabs including a first slab, a second slab and a third slab are prepared, and the combined surfaces of the three slabs are subjected to surface cleaning, the thicknesses H1, H2 and H3 of the first slab, the second slab and the third slab meet the following requirement: the total thickness H: H1+H2+H3 is larger than 600 mm, 1/5 <H1/H <1/2, 1/5 <H3/H ,1/2; b), vacuum welding: the peripheries of the combined surfaces of the three slabs are welded under the vacuum environment, and the peripheries of the combined surfaces are sealed; c), heating: the heating temperature is 1100 DEG C to 1250 DEG C, and the temperature holding time is larger than 4 hours; and d), rolling: the bloom rolling temperature is 1000 DEG C to 1200 DEG C, the finishing rolling temperature is within recrystallization temperature, and the reduction in pass is 5 to 60 mm. According to the invention, the combined interfaces are placed at the positions of a half to one fifth of thicknesses of the slabs, the combined surfaces of the slabs are deformed greatly, and recrystallization is performed near the combined surfaces to a greater degree, so that composite quality of good combination is obtained.

Description

The method of the special thick composite plate of asymmetric compound Rolling Production
Technical field
The present invention relates to thick composite plate manufacturing technology, particularly the method for the special thick composite plate of a kind of asymmetric compound Rolling Production.
Background technology
Manufacture method " super steel plate and manufacture method thereof ", JP2005-177817A " manufacture method of super steel plate " and JP2005-297013A " pole steel plate and manufacture method thereof " disclosed in Japanese invention JP2005-152998A of special heavy plate.These patents all have employed consistent scheme, and namely by two pieces or more uniform thickness sheet packs together, the surrounding welded closure of contact surface, then heats and rolling slab.
In above-mentioned patent, in the operation of rolling, the deformation parameter of composite plate blanks is calculated by following formula:
Seff=∑[(σtc max/k 0)-1]
∑ represents the deformation parameter summation of each passage, as (σ tc max/k 0)-1 < o time, do not add.
σtc max/k 0=1.67×(ld/h m)+0.5
Ld: the contact projection arc length degree
Hm: average thickness of slab (porch thickness of slab and exit thickness of slab average)
K 0: resistance of deformation
When Seff > 0.3 and pressure are than under the condition being less than 2, realize slab rolling compound, by this method, produce the thick thick composite plate above of 200mm.
Domestic with the steel that helps for representative, be combined into the steel billet of 265mm thickness by the Q235 continuous casting billet of two 135mm thickness, be rolled into the slab of 90mm and 140mm.
Slab, in the operation of rolling, is out of shape at slab thickness directional spreding uneven.As shown in Figure 2, for equivalent strain after 800mm heavy slab single pass pressure 50mm is in slab thickness directional spreding situation, show that distortion integrated distribution is within the scope of steel slab surface certain thickness, when slab thickness is more than 200mm, the deflection of core reduces along with the thickness increase of slab.
Steel plate hot of the same race rolls into thick composite plate, and the combination at interface between slab, can make full use of interface recrystallization.By rolling temperature range reasonable in design and drafts, impel interface repeatedly recrystallization to occur, thus improve composite quality.
Two conditions that recrystallization occurs are temperature and distortion.First, rolling temperature needs to be within the scope of recrystallization temperature.Secondly, deflection is larger, and provide the energy of generation recrystallization larger, recrystallization degree is higher, and the newly-generated crystal grain in interface can promote the bond strength of composite surface.
By above-mentioned analysis, can find out, Japan's three patents and Ji steel have certain limitation by the method for double-layer continuous casting base Rolling Production slab.As can be seen from Figure 1, when slab composite rolling of the same race becomes the thickness of composite plate at about 200mm, slab center can obtain larger distortion, by there is recrystallization, thus obtains in conjunction with good composite quality.And along with the further raising of composite plate thickness, the deflection of slab core reduces, the composite quality of faying face will certainly be affected.
Summary of the invention
The object of the present invention is to provide the method for the special thick composite plate of a kind of asymmetric compound Rolling Production, mid-depth position is in by changing combination interface, the limitation of prior art can be broken through, slab center can obtain larger distortion, by there is recrystallization, thus obtain in conjunction with good composite quality.The slab of more than thickness 300mm can be produced especially.
For achieving the above object, technical scheme of the present invention is:
The method of the special thick composite plate of asymmetric compound Rolling Production, it comprises the steps:
1) slave board, prepare three blocks of slabs, i.e. first, second, third slab, the faying face of three blocks of slabs needs through removing surface, and thickness H1, H2, H3 of first, second, third slab should meet following requirements:
Gross thickness H H1+H2+H3 > 600mm,
1 5 < H 1 H < 1 2 , 1 5 < H 3 H < 1 2 ;
2) vacuum welding, adopts welding to the surrounding on three pieces of slab composition surfaces under vacuum conditions, and by composition surface environmental seal, ensures that slab is in heating and the operation of rolling, does not occur that weld bond ftractures;
3) heat, heating-up temperature is 1100 DEG C ~ 1250 DEG C, and temperature retention time is greater than 4 hours, makes slab core heat penetration;
4) rolling, start rolling temperature 1000 DEG C ~ 1200 DEG C, finishing temperature is within the scope of recrystallization temperature, reduction in pass scope 5 ~ 60mm.
Further, the surrounding on described three pieces of slab composition surfaces adopts vacuum welding, forms negative pressure between slab and slab.
Again, first, second slab described is one block of slab.
Second, third slab described is one block of slab.
As H1/H=1/2, be traditional scheme, the present invention needs to avoid composite surface to be in position in thickness.And during H1/H (H3/H) < 1/5, the first slab and the 3rd slab excessively thin, for manufacture slab there is no too large meaning, therefore, the thickness of the present invention to slab specially requires.
The surrounding of the present invention's three pieces of slab faying faces, by being welded to connect, is placed in faying face in 1/5 ~ 1/2 aspect of integral thickness.And in traditional composite rolling, connected by the Plate Welding of two pieces of uniform thickness, faying face is placed in 1/2 aspect place of thickness.
Fig. 1 shows in heavy plate rolling process, deflection (PEEQ) distribution from surface of steel plate to steel plate center on thickness direction.As can be seen from Figure 1, distance surface of steel plate is less than in the thick scope of 100mm, can obtain larger distortion.And distance more than surface of steel plate 100mm, the distortion of steel plate inside distributes along with the distance with surface of steel plate is little more greatly and more and more, and steel plate thickness center (i.e. 1/2 thickness position) is deflection is minimum place.
Due to the compound of compound thick stock in the operation of rolling, need to rely on steel plate faying face place that recrystallization occurs, generate new crystal grain at faying face place, play the effect connecting upper and lower two block plates of faying face.The degree of recrystallization is larger, better in conjunction with effect.And affecting the size that one of key factor of recrystallization degree is exactly deflection, deflection is larger, and the degree of recrystallization is larger.
According to the above discussion, traditional composite rolling technology is by composite rolling after two pieces of uniform thickness Plate Weldings, faying face is in 1/2 thickness aspect, be the minimum position of deflection in the operation of rolling, the combined efficiency reached and effect are also that poor, final product thickness can only reach 200mm.
And the present invention is positioned over compound aspect in 1/5 ~ 1/2 thickness aspect, then significantly can promote the distortion at faying face place, thus increase the recrystallization degree at faying face place, final improve faying face joint efficiency and in conjunction with effect, finally can realize product thickness and reach 300mm.
In the operation of rolling, the distribution of Deformation in thickness amount is asymmetric about faying face, therefore is called " asymmetric compound rolling technique ", also distinguishes with current traditional composite rolling technology and comes.
By the inventive method, the production of 300mm thick composite plate can be realized.
Accompanying drawing explanation
Fig. 1 be in heavy plate rolling process deflection (PEEQ) at the distribution schematic diagram of thickness direction.
Fig. 2 is slab configuration schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described.
Testing program one:
Three layers of assembly thickness 720mm altogether, produce 300mm slab.
Prepare three blocks of slabs, thickness 240mm+240mm+240mm, gross thickness 720mm, compound aspect is positioned at 1/3 place of through thickness.
3 pieces of slab faying faces are carried out removing surface, then carries out vacuum welding.Composite billet after welding is put into heating furnace and is heated to 1230 DEG C, be incubated open rolling after 5 hours.Start rolling temperature 1190 DEG C, each reduction in pass scope 15 ~ 30mm, finishing temperature 1100 DEG C.
To the thick composite plate after rolling, detect a flaw according to " National Standard of the People's Republic of China-steel plate supersonic testing method GB/T 2970-2004 ", meet GB secondary standard.
Testing program two:
Bilayer is uniform thickness assembly thickness 720mm altogether not, produces the slab of 360mm.
In order to contrast with traditional scheme, prepare 3 groups of composite billets.Often organize two block plates, control each block plate thickness, make compound aspect be positioned at different positions in a thickness direction.
First group of (comparative example) slab compound aspect is in 1/2 place of through thickness, and the thickness of two block plates is 360mm+360mm, and namely traditional two pieces are waited steel plate configuration, to contrast as test effect.
Second group of (embodiment) slab compound aspect is in 1/3 place of through thickness, and the thickness of two block plates is 240mm+480mm.
3rd group of (embodiment) slab compound aspect is positioned at 1/5 place of through thickness, and the thickness of two block plates is 144mm+576mm.
By 3 groups of slabs through removing surface, then carry out assembly vacuum welding.Three groups of composite billets are placed in heating furnace and are heated to 1200 DEG C, 1200 DEG C of soaking open rollings after 5 hours.The hot rolling technology of three groups of composite billets is identical, start rolling temperature 1170 DEG C, each reduction in pass scope 25 ~ 35mm, finishing temperature 980 DEG C.
Above-mentioned testing program, implements according to 1/3 likelihood ratio according to likelihood ratio principle in laboratory.
To the thick composite plate after the rolling of laboratory, detect a flaw according to " National Standard of the People's Republic of China-steel plate supersonic testing method GB/T 2970-2004 ".
Result shows, it is qualified that the steel plate inspection that traditional sandwich rolling process obtains reaches GB three grades, reach GB secondary by asymmetric compound rolling technique production slab quality of the present invention qualified, show that the thick composite plate quality of being produced by the present invention is better than the slab of traditional composite rolling technology production.
Table 1 scheme two assembly parameter and result of detection
Testing program three:
Bilayer is uniform thickness assembly thickness 600mm altogether not, one-pass roller.
First group of (comparative example) slab compound aspect is in 1/2 place of through thickness, and the thickness of two block plates is 300mm+300mm, and namely traditional two pieces are waited steel plate configuration, to contrast as test effect.
Second group of (embodiment of the present invention) slab compound aspect is in 1/3 place of through thickness, and the thickness of two block plates is 200mm+400mm.
3rd group of (embodiment of the present invention) slab compound aspect is positioned at 1/5 place of through thickness, and the thickness of two block plates is 120mm+480mm.
Above-mentioned each group of steel plate is through removing surface, and vacuum welding, forms composite billet, be positioned over by composite billet in heating furnace and be heated to 1150 DEG C, open rolling after being then incubated 4 hours.Three groups of composite billets have all carried out one-pass roller, rolling temperature 1130 DEG C, drafts 60mm.
Above-mentioned testing program, implements according to 1/5 likelihood ratio according to likelihood ratio principle in laboratory.
With reference to GB " People's Republic of China's mechanics and technological property test method GB/T 6396-2008 ", shearing mechanics tensile sample is processed into the composite plate after the rolling of laboratory and carries out the detection of shearing bond strength mechanics.
Result shows, the composite plate shearing bond strength that the present invention program obtains all is better than the composite plate shearing bond strength that traditional scheme obtains.
Table 2 scheme three assembly parameter and mechanical stretch result

Claims (3)

1. the method for the special thick composite plate of asymmetric compound Rolling Production, it comprises the steps:
1) slave board, prepare three blocks of slabs, i.e. first, second, third slab, the faying face of three blocks of slabs needs through removing surface, thickness H1, H2, H3 of first, second, third slab should meet following requirements: gross thickness H=H1+H2+H3>600mm
1 5 < H 1 H < 1 2 , 1 5 < H 3 H < 1 2 ;
2) vacuum welding, under vacuum conditions welding is adopted to the surrounding on three pieces of slab composition surfaces, and by composition surface environmental seal, namely the surrounding on described three pieces of slab composition surfaces adopts vacuum welding, negative pressure is formed between slab and slab, ensure that slab is in heating and the operation of rolling, does not occur that weld bond ftractures;
3) heat, heating-up temperature is 1100 DEG C ~ 1250 DEG C, and temperature retention time is greater than 4 hours, makes slab core heat penetration;
4) rolling, start rolling temperature 1000 DEG C ~ 1200 DEG C, finishing temperature is within the scope of the recrystallization temperature of steel grade, reduction in pass scope 5 ~ 60mm.
2. the method for the special thick composite plate of asymmetric compound Rolling Production as claimed in claim 1, it is characterized in that, first, second slab described is one block of slab.
3. the method for the special thick composite plate of asymmetric compound Rolling Production as claimed in claim 1, it is characterized in that, second, third slab described is one block of slab.
CN201110045798.8A 2011-02-25 2011-02-25 Method for producing extra thick composite board through dissymmetrical composite rolling Active CN102649123B (en)

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CN104209660A (en) * 2013-05-31 2014-12-17 宝山钢铁股份有限公司 Composite blank assembly welding groove preparation method
CN103522072A (en) * 2013-09-29 2014-01-22 丹阳市瑞新复合材料有限公司 Production method of extremely thick copper plate uniform in performance in thickness direction
CN105806302B (en) * 2016-03-25 2018-03-30 首钢总公司 The experimental method of inside steel billet metal strain in a kind of test operation of rolling
CN106191658A (en) * 2016-08-19 2016-12-07 南京钢铁股份有限公司 A kind of technique of three base laminating production spy's thickness low-temperature impact steel plates
CN110605530B (en) * 2019-09-23 2021-04-16 江阴兴澄特种钢铁有限公司 Assembly method for producing super-thick steel plate

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Publication number Priority date Publication date Assignee Title
CN101049745A (en) * 2007-05-11 2007-10-10 西南大学 Composite magnesium plate ribbon of magnesium clad aluminum product and composition method
CN102848135A (en) * 2011-06-28 2013-01-02 鞍钢股份有限公司 Production method of super-thick steel plate with even performance in thickness direction

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JP2663736B2 (en) * 1991-03-05 1997-10-15 住友金属工業株式会社 Manufacturing method of extra thick steel plate
JP2005152998A (en) * 2003-11-28 2005-06-16 Jfe Steel Kk Ultra-thick steel plate and method for manufacturing it
JP4654594B2 (en) * 2004-04-13 2011-03-23 Jfeスチール株式会社 Extra-thick steel plate and manufacturing method thereof

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CN101049745A (en) * 2007-05-11 2007-10-10 西南大学 Composite magnesium plate ribbon of magnesium clad aluminum product and composition method
CN102848135A (en) * 2011-06-28 2013-01-02 鞍钢股份有限公司 Production method of super-thick steel plate with even performance in thickness direction

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