CN110605530B - Assembly method for producing super-thick steel plate - Google Patents

Assembly method for producing super-thick steel plate Download PDF

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Publication number
CN110605530B
CN110605530B CN201910634979.0A CN201910634979A CN110605530B CN 110605530 B CN110605530 B CN 110605530B CN 201910634979 A CN201910634979 A CN 201910634979A CN 110605530 B CN110605530 B CN 110605530B
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thickness
steel plate
difference
base
blank
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CN110605530A (en
Inventor
刘海宽
李国忠
苗丕峰
叶建军
张建
阳日隆
徐伟
恽鹏程
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Abstract

The invention relates to a method for assembling a super-thick steel plate, which adopts two or more steel billets with the same steel grade and different thicknesses as base billets, welds the two or more steel billets into a composite billet, and then rolls the composite billet into the finished product thickness, wherein the method for assembling the super-thick steel plate is characterized in that the thickness difference of the two or more base billets is utilized to ensure that the 1/4 position, 1/4 position and 1/2 position of the finished product steel plate can simultaneously avoid 1/2 position of the base billet, thereby improving the uniformity and stability of the mechanical properties of the 1/4 position, 1/4 position and 1/2 position of the finished product steel plate.

Description

Assembly method for producing super-thick steel plate
Technical Field
The invention relates to a method for assembling an extra-thick steel plate by adopting a technology of obtaining a large-thickness blank by a composite blank.
Background
The super-thick steel plate is mainly used in large engineering or equipment, and generally requires that the positions of the thickness 1/4 and the thickness 1/2 of the steel plate have good mechanical properties, especially low-temperature impact toughness. The present technology for manufacturing composite blank of super-thick steel plate is to use continuous casting blanks with same steel type, same furnace number, same composition and same section size as base blank to make composite, and its composite assembly mode mainly includes two-blank composite and three-blank composite. No matter which composite assembly mode is adopted, the mechanical property sampling position of the steel plate can not avoid the metallurgical defects of segregation, looseness, cracks and the like at the position of the thickness 1/2 of the continuous casting base blank, and the mechanical property stability of the steel plate at the position of the thickness 1/4 or the thickness 1/2 of the steel plate is poor, even the requirement of product standard can not be met.
The invention patent with publication number CN108247297A relates to a process for preparing composite casting blanks for high-toughness thick steel plates, and provides a process for compounding continuous casting blanks with different furnace numbers, the same steel types and different carbon contents, wherein the composite assembly mode is three-blank compounding, the inner layer of the composite blank adopts low-carbon composition design, the center segregation is improved, the quality and the toughness of the center part of the steel plate are improved, the outer layer adopts high-carbon composition design, the carbon content range of a peritectic region is avoided, the surface crack occurrence rate is reduced, the components are homogenized through high-temperature diffusion in the heating process, and the comprehensive consideration of the strength and the toughness is realized. The invention is a good solution in the aspect of improving the core toughness and the surface quality of the steel plate, but because the difference of the carbon content of the inner layer steel plate and the outer layer steel plate is large, the component homogenization is difficult to realize through high-temperature heating solid diffusion, the difference of the chemical components and the mechanical properties of the inner layer steel plate and the outer layer steel plate is inevitably large, the requirements of the extra-thick steel plate on the uniformity of the chemical components and the mechanical properties in the thickness direction cannot be met, and the invention can only be applied to very special fields, and has a small application range. In addition, although the inner layer blank is designed by adopting low-carbon components, the steel plate 1/2 still does not avoid the metallurgical defects such as the thickness center of the continuous casting base blank, segregation, porosity, cracks and the like, and the metallurgical defects still affect the stability of the mechanical property at the steel plate 1/2 to a certain extent.
The invention patent with the publication number of CN107460278A relates to a process for producing a large-single-weight and extra-thick steel plate by multiple composite plate blanks, and provides a process for producing a large-single-weight and extra-thick steel plate by multiple composite plate blanks, in particular to a process for carrying out two-blank compounding or three-blank compounding by adopting a vacuum compounding technology, and after cutting a first-time composite rolled steel plate, carrying out second compounding by taking a composite steel plate as a base blank. The invention aims to produce a large single-weight super-thick steel plate by adopting a multiple-compounding alternative forging process, reduce the production cost and shorten the construction period. If the three-blank compounding is adopted firstly, and then the compound steel plate is used as the base blank for the second compounding, the thickness 1/4 of the final finished steel plate is still equal to the thickness 1/2 of the continuous casting base blank, namely the position with the most serious metallurgical defects such as segregation, looseness and the like, and the stability of the mechanical property of the position is still poor. If the invention adopts two-blank compounding firstly, and then takes the compound steel plate as the base blank to carry out the second compounding, the thickness 1/4 and the thickness 1/2 of the steel plate are both compound interfaces, although the mechanical property sampling position can simultaneously avoid the thickness 1/2 of the continuous casting base blank, so that the mechanical properties of the steel plate at the thickness 1/4 and the thickness 1/2 can simultaneously meet the standard and the use requirement, but compared with the one-time rolling compounding, the production cost and the production period are obviously increased.
The above patents are innovative production modes based on the traditional composite mode, and have the common disadvantage that the technical requirements of steel plate thickness 1/4 and steel plate thickness 1/2 and avoiding the metallurgical defects at the continuous casting base billet thickness 1/2 can not be met at low cost on the basis of ensuring the uniformity of the chemical components of the steel plate.
Based on the prior art, the applicant provides a composite blank assembly method which adopts two continuous casting blanks with the same steel type, different furnace numbers and different thicknesses as base blanks. The invention has simple process and flexible assembly, is suitable for batch production, and does not find patents related to the process through retrieval.
Disclosure of Invention
The invention aims to solve the technical problem of providing an assembly method for producing an ultra-thick steel plate by adopting a vacuum composite technology in the prior art.
In order to achieve the purpose, the technical scheme of the application is as follows: a method for assembling super-thick steel plate features that two or more steel blanks with same type and different thicknesses are used as basic blank, and two steel blanks are welded to form a composite blank, which is then rolled to obtain the finished product with different thicknesses, so the positions 1/4, 1/4 and 1/2 on the finished product can be kept away from the position 1/2 on the basic blank, resulting in higher uniformity and stability of mechanical properties at 1/4, 1/4 and 1/2 on the finished product.
The assembly method comprises the following steps:
(1) preparing a base blank: selecting two or more plate blanks with the same steel type, different furnace numbers, different thicknesses and the same width and length as blank materials to be assembled;
(2) blank compounding: the method adopts the currently disclosed vacuum electron beam welding method for compounding and comprises the working procedures of milling and grinding the contact surface, removing oil stain, stacking, vacuumizing, welding, sealing and the like.
(3) Production of super-thick steel plates: heating the composite blank in a soaking furnace to 1200-1250 ℃, preserving heat for more than or equal to 8 hours, and adopting a rolling process of high temperature, low speed and high pressure, and forming metal bond combination on a composite interface through repeated recrystallization in the high temperature diffusion and rolling process. The finished steel plate is subjected to normalizing treatment, so that the uniformity of the structure performance of the steel plate is further improved.
In order to ensure the integral uniformity of chemical components and mechanical properties in the thickness direction of the steel plate, the two base blanks in the step (1) need to meet the following conditions:
(1) the chemical components of the base blank are as follows: the difference between the carbon contents of the upper and lower continuous casting base blanks is less than or equal to 0.02 percent, the difference between the Si contents is less than or equal to 0.05 percent, the difference between the Mn contents is less than or equal to 0.05 percent, the difference between the Cr contents is less than or equal to 0.05 percent, the difference between the Ni contents is less than or equal to 0.05 percent, the difference between the Cu contents is less than or equal to 0.05 percent, the difference between the Mo contents is less than or equal to 0.05 percent, the difference between the Nb contents is less than or equal to 0.01 percent, the difference between the V contents is less than or equal to 0.01 percent, the difference between the Ti contents is less than.
(2) The low-power quality of the base blank is as follows: the segregation is not more than class B1.0 grade, the porosity is not more than 1.0 grade, and the crack is not more than 1.0 grade.
(3) Selecting the thickness of the base blank: the thickness of the upper and lower layers of continuous casting base blanks and the thickness of the rolled finished steel plate simultaneously meet the following conditions:
①|B-A︱≥40(A+B)/C;
②B≥20(A+B)/C;
③A≥20(A+B)/C;
wherein A, B is the thickness of the upper and lower continuous casting base blanks respectively, and C is the thickness of the rolled finished steel plate.
The reasons for selecting the above process parameters and limitations of the present invention are as follows:
the invention requires that the content difference of C, Si, Mn, S, P, Ni, Cr, Cu, Mo, Nb, V and Ti of the upper and lower continuous casting base blanks is within a certain range, and aims to prevent the uneven directional performance of the thickness of the steel plate finally caused by the large difference of the chemical components of the upper and lower continuous casting base blanks.
Although the steel plate with the thickness of 1/4, the thickness of 1/4 and the thickness of 1/2 can avoid the metallurgical defects of segregation, porosity, cracks and the like at the position of 1/2 of the continuous casting base billet, the metallurgical interface defects still exist on a certain thickness layer of the steel plate, and in order to ensure the uniformity of the overall quality performance in the thickness direction of the super-thick steel plate, the metallurgical defects of segregation, porosity and cracks of the continuous casting base billet are necessary to be controlled within a certain grade range, which is also a precondition of the practical significance of the invention in the production of the steel plate.
The thickness direction of the super-thick steel plate has 5 typical positions in total, including 1/4 parts above the thickness, 1/4 parts below the thickness, 1/2 parts below the thickness, 1/2 parts of the upper-layer base blank and 1/2 parts of the lower-layer base blank. The relative positions of these 5 typical positions are related to the thickness of the upper and lower continuous casting bases and the thickness of the finished steel plate. As shown in fig. 1 and 2, after the thicknesses of the upper and lower base blanks are determined, the relative position difference between the upper 1/4, the lower 1/4, 1/2, the upper 1/2 and the lower 1/2 steel plate thicknesses is larger as the steel plate thickness increases. When sampling is carried out at 1/4, 1/4 and 1/2 positions on the thickness of the steel plate in actual production, the sampling positions can completely avoid the metallurgical defects of segregation, porosity, cracks and the like at the center of the thickness of the upper and lower layers of continuous casting base billets, and the relative position difference between 5 typical positions in the thickness direction of the steel plate is at least 10 mm. According to mathematical calculation, the thickness of the upper and lower layers of continuous casting base blanks and the thickness of the rolled finished steel plate simultaneously meet the following conditions:
①|C/4-C/2×A/(A+B)︱≥10;
②C/2-C/2×A/(A+B)≥10;
③C/2-C/2×B/(A+B)≥10;
the method is simplified and can be obtained:
①|B-A︱≥40(A+B)/C;
②B≥20(A+B)/C;
③A≥20(A+B)/C;
wherein A, B is the thickness of the upper and lower continuous casting base blanks respectively, and C is the thickness of the rolled finished steel plate.
Compared with the prior art, the invention has the following characteristics:
the super-thick steel plate produced by the process has the quality performance advantages of the super-thick steel plate produced by the currently disclosed composite blank, and further has excellent flaw detection performance and lamellar tearing resistance. The present invention is also characterized in that:
1. the steel plate 1/4, 1/4 and 1/2 completely avoid the metallurgical defects of segregation, porosity, cracks and the like at the center of the thickness of the continuous casting base billet, thereby improving the uniformity and stability of the mechanical properties of 1/4, 1/4 or 1/2 parts of the steel plate.
2. Compared with the compounding of two continuous casting base blanks with the same thickness, the steel plate compound interface position is closer to the surface of the steel plate, thereby being beneficial to the penetration of rolling deformation, improving the quality of the compound interface and meeting the requirement of smaller rolling compression ratio.
3. The production process is simple, the assembly is flexible, the method is suitable for batch production, and the production cost is not additionally increased.
Drawings
FIG. 1 is a graph showing the distance of 5 typical positions from the upper surface of a steel plate as a function of the thickness of the final steel plate after assembly of a 150mm thick base blank and a 370mm thick base blank;
fig. 2 shows the distance of 5 typical positions from the upper surface of the steel plate after assembly of a 150mm thick base blank and a 450mm thick base blank as a function of the final steel plate thickness.
Detailed Description
The present invention will be described in further detail with reference to examples.
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes and equivalents that do not depart from the spirit and scope of the invention are intended to be included within the scope thereof.
The basic information of the composite blanks and the steel plates in the examples and the comparative examples of the invention is shown in table 1, the chemical compositions of the composite blanks in the examples and the comparative examples are shown in table 2, and the performance test results of the steel plates produced in the examples and the comparative examples are shown in table 3.
The assembly method for producing the super-thick steel plate by adopting the vacuum composite technology comprises the following steps
(1) Preparing a base blank: selecting two continuous casting plate blanks with the same steel type, different furnace numbers, different thicknesses and the same width and length as a base blank to be assembled;
(2) blank compounding: two base blanks or a plurality of base blanks are stacked, and the contact surfaces of the base blanks are milled, degreased, stacked, vacuumized and combined and welded into a composite blank through a vacuum electron beam;
(3) rolling: heating the composite blank to 1200-1250 ℃, preserving heat for more than or equal to 8h, performing high-temperature diffusion, adopting a high-temperature, low-speed and high-reduction rolling process, ensuring that the reduction rate of a single pass is more than 35% in the rolling process for at least 3 passes, rolling the composite blank into finished steel, and repeatedly recrystallizing in the high-temperature diffusion and rolling processes to form metal bond combination on a composite interface;
(4) the finished steel plate is subjected to normalizing treatment, so that the uniformity of the structure performance of the steel plate is further improved.
TABLE 1 basic information of the composite blank assembly and the steel sheet in each of the examples and comparative examples
TABLE 2 chemical composition (wt%) of composite compact in each of examples and comparative examples
TABLE 3 results of testing the properties of the steel sheets produced in the examples and comparative examples
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.

Claims (6)

1. An assembly method for producing an ultra-thick steel plate is characterized by comprising the following steps: two or more steel billets of the same steel grade and different thicknesses are adopted as base billets, two or more steel billets are welded into a composite billet, and the composite billet is rolled into finished product thickness, which is characterized in that: the assembly method is characterized in that the thickness difference of two or more base blanks is utilized, so that the positions 1/4 above the thickness, 1/4 below the thickness and 1/2 of the finished steel plate can simultaneously avoid the positions 1/2 of the thickness of the base blanks, and the uniformity and stability of the mechanical properties of the positions 1/4 above the thickness, 1/4 below the thickness and 1/2 below the thickness of the finished steel plate are improved; typical position in the thickness direction of the finished steel sheet: the distance between two adjacent positions in the plurality of typical positions in the thickness direction is more than 10mm at the position 1/4 above the thickness, 1/4 below the thickness, 1/2 below the thickness and the thickness corresponding to the thickness 1/2 of the two or more base blanks respectively;
the finished steel plate is rolled by the composite blank of the two base blanks, and the thickness A, B of the upper base blank and the lower base blank and the thickness C of the finished steel plate simultaneously satisfy the following conditions:
①|B-A︱≥40(A+B)/C;
② B≥20(A+B)/C;
③ A≥20(A+B)/C。
2. a method of assembling a super thick steel plate according to claim 1, wherein: the two or more bases, apart from unavoidable impurity elements, have the same elemental composition and the difference between the same elements is satisfied: the difference of the carbon content is less than or equal to 0.02 percent, the difference of the Si content is less than or equal to 0.05 percent, the difference of the Mn content is less than or equal to 0.05 percent, the difference of the Cr content is less than or equal to 0.05 percent, the difference of the Ni content is less than or equal to 0.05 percent, the difference of the Cu content is less than or equal to 0.05 percent, the difference of the Mo content is less than or equal to 0.05 percent, the difference of the Nb content is less than or equal to 0.01 percent, the difference of the V content is less than or equal to 0.01 percent, the difference of the Ti element content is less than.
3. A method of assembling a super thick steel plate according to claim 1, wherein: the low-power mass of the two or more base blanks is required to meet the following requirements: the segregation is not more than class B1.0 grade, the porosity is not more than 1.0 grade, and the crack is not more than 1.0 grade.
4. A method of assembling a super thick steel plate according to any one of claims 1 to 3, wherein: the steps are as follows
Step one, preparing a base blank: selecting two or more continuous casting plate blanks with the same steel type, different furnace numbers, different thicknesses and the same width and length as base blanks to be assembled;
step two, blank compounding: laminating two or more base blanks, and welding the two or more base blanks into a composite blank by vacuum electron beam combination;
step three, rolling: heating the composite blank to 1200-1250 ℃, keeping the temperature for more than or equal to 8 hours, performing high-temperature diffusion, rolling the composite blank into finished steel by adopting a high-temperature, low-speed and high-reduction rolling process, and repeatedly recrystallizing in the high-temperature diffusion and rolling processes to form metal bond combination on a composite interface;
and step four, normalizing the finished steel plate to further improve the uniformity of the steel plate structure performance.
5. An assembling method for producing a super thick steel plate according to claim 4, wherein: before compounding, milling and grinding the contact surface of the base blank, removing oil stain, stacking and vacuumizing.
6. An assembling method for producing a super thick steel plate according to claim 4, wherein: and step three, the rolling process has at least 3 times with the single-pass reduction rate of more than 35%.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPH1128501A (en) * 1997-07-07 1999-02-02 Nippon Steel Corp Continuous cast thick steel plate and its manufacture
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
CN105458005A (en) * 2015-12-28 2016-04-06 中国第一重型机械股份公司 Preparation method for asymmetrical wide hot-rolled metal composite plates

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPH1128501A (en) * 1997-07-07 1999-02-02 Nippon Steel Corp Continuous cast thick steel plate and its manufacture
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
CN105458005A (en) * 2015-12-28 2016-04-06 中国第一重型机械股份公司 Preparation method for asymmetrical wide hot-rolled metal composite plates

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
复合连铸坯叠轧生产特厚Q345R钢板工艺的开发与应用;刘金泉;《宽厚板》;20160229;第22卷(第1期);23-26 *

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