CN114892073A - Steel plate suitable for cold spinning processing and manufacturing method thereof - Google Patents
Steel plate suitable for cold spinning processing and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000009987 spinning Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000003672 processing method Methods 0.000 title description 2
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 238000005336 cracking Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 11
- 239000011575 calcium Substances 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000001953 recrystallisation Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 238000005204 segregation Methods 0.000 claims description 4
- 239000006104 solid solution Substances 0.000 claims description 4
- 238000009849 vacuum degassing Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000005422 blasting Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 14
- 238000009749 continuous casting Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000011572 manganese Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a steel plate suitable for cold spinning and a manufacturing method thereof, the chemical components of which are 0.04 to 0.06 wt.%, 0.10 to 0.15 wt.% of C, 1.30 to 1.50 wt.% of Si, 0.02 to 0.04 wt.% of Al, 0.035 to 0.055 wt.% of Nb, 0.01 to 0.02 wt.% of Ti, less than or equal to 0.0008 wt.% of S and [ H ] of]≤1ppm，[O]Not more than 8ppm, Ca/S not less than 1.5; the balance being Fe and unavoidable impurities. The steel plate is a polygonal ferrite structure, the yield strength is more than or equal to 400MPa, the tensile strength is 450-550MPa, and the elongation percentage A 50 More than or equal to 50 percent, the yield ratio is less than or equal to 0.70, and the total grade of A + B + C + D type inclusions in the steel is less than or equal to 2.0; after cold spinning multi-pass spinning according to the compression ratio of 3.5-4 times, the performance can meet the requirements that the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 900MPa and the elongation (A) 50 ) Not less than 12 percent, and no cracking on the surface.
Description
Technical Field
The invention belongs to the technical field of iron-based metallurgy, and relates to a medium plate suitable for cold spinning processing and a manufacturing method thereof.
Background
In the field of mechanical manufacture of metal pipe tubes, the conventional manufacturing process is to manufacture a seamless steel pipe and a medium plate base, and then weld the seamless steel pipe and the medium plate base into the metal pipe tube. The process flow is long, the efficiency is low, the latest cold spinning production technology is adopted, the round cake can be directly processed into the metal pipe barrel in a cold spinning processing mode, the metal pipe barrel is integrally formed, and the efficiency is greatly improved. The new process has very strict requirements on raw materials, and not only the materials are required to have good cold processing performance and high elongation, but also the iron oxide scale on the surface of the materials is required to be thin and uniform, the interior of the materials is high-purity, large-particle hard phase inclusions are not contained, and hard phase banded structures and internal stress influencing the processing performance are required.
At present, cold-processed steel plates are generally produced by adopting a mode of carrying out acid pickling treatment on hot-rolled steel coils, and a mode of directly adopting medium plates for cold spinning processing is rare, and series problems of comprehensively evaluating the surface quality, the internal stress, the internal tissue uniformity, the performance change before and after deformation and the like of the steel plates are required.
Around the cold spinning process, developing a medium steel plate that satisfies high uniform elongation, high performance uniformity, and purity becomes a problem that needs to be considered by those skilled in the art.
Disclosure of Invention
The invention aims to provide a medium steel plate capable of meeting cold spinning processing and a manufacturing method thereof.
The technical scheme adopted by the invention is as follows: a steel plate suitable for cold spinning processing comprises 0.04-0.06 wt.% of chemical components of C, 0.10-0.15 wt.% of Si, 1.30-1.50 wt.% of Mn, 0.02-0.04 wt.% of Al, 0.035-0.055 wt.% of Nb, 0.01-0.02 wt.% of Ti, less than or equal to 0.0008 wt.% of S, less than or equal to 1ppm of [ H ], lessthan or equal to 8ppm of [ O ], and more than or equal to 1.5 wt.% of Ca/S; the balance being Fe and unavoidable impurities.
The reason for setting the functions and contents of the key elements in the present invention is specifically described as follows:
c: key elements influencing phase change in the steel have key influence on the strength and the elongation of the steel, and from the aspect of elongation, the lower the carbon content is, the more the elongation is favorably improved, but the strength is greatly reduced; meanwhile, too high carbon content may aggravate center segregation and have a large influence on tissue uniformity. The comprehensive balance is realized, and the C content selection range is 0.04-0.06%.
Si: the main deoxidizing elements can play a role in solid solution strengthening, but have a remarkable influence on the surface quality of a steel plate, and the high silicon content easily causes the unclean removal of iron scales in the descaling process, so that the surface quality is poor; comprehensively considering the requirements of the product in the patent of the invention on the surface, the selection range of Si content is 0.10-0.15%.
Mn: the main alloy strengthening elements in the invention improve the strength and toughness of steel through solid solution strengthening, but when the content is too high, a central segregation hardening zone is easily formed in the continuous casting process, a brittle abnormal structure is generated, and the stability of low-temperature toughness is not facilitated. The reasonable selection range of Mn is 1.30-1.50% by comprehensively considering the influence on low-temperature toughness and solid solution strengthening.
Al: mainly deoxidize elements and fine crystal elements, and play a role in refining crystal grains by forming AlN. The selection range of the Al content is 0.02-0.04%.
Nb: the grain elements are mainly refined, the austenite recrystallization temperature of the steel is obviously improved, the range of a non-recrystallization region is expanded, and the grain size of the prior austenite is obviously refined; meanwhile, a fine Nb (C, N) precipitated phase is formed during rolling in a non-recrystallization area, and ferrite grains are refined; comprehensively considered, the selection range of the Nb content of the invention is 0.035-0.055%.
Ti and N, C form TiN and TiC to play a role in refining prior austenite grains, and due to the high melting point of TiN, the grain size of a welding heat affected zone can be refined, and the low-temperature toughness of the welding heat affected zone is improved. In comprehensive consideration, the selection range of Ti is 0.01-0.02%.
S: harmful elements in steel are easy to form MnS hard phase inclusions with Mn, are not beneficial to elongation percentage improvement, and are easy to break in the cold spinning process, and the selection range of S is less than or equal to 0.0008 percent in comprehensive consideration;
h: the main influence factor of delayed fracture in the high-strength steel, white spots are easily formed when the content is excessive, so that the elongation is reduced, the material is subjected to brittle fracture, and for the cold spinning material, the strength is very high in the final use state, so that the H content is selected to be less than or equal to 1 ppm;
o: key index elements influencing the inclusion content, when the O content is too high, the content of the internal inclusions is increased, and the internal inclusions are easy to break in the spinning process, and the selection range of O is less than or equal to 8ppm by comprehensive consideration;
ca promotes the inclusions in the molten steel to float upwards through Ca treatment, and simultaneously performs spheroidization on MnS, thereby improving the purity of the molten steel and reducing the quality problem caused by internal defects in the spinning process. Comprehensively considering, the selection range of Ca is set according to the content of S, and Ca/S is more than or equal to 1.5.
Another object of the present application is to provide a method for manufacturing the medium plate, which has a thickness of 8-20mm, and comprises the following steps:
in the steelmaking process, a continuous casting billet with the thickness of 150mm is produced by adopting converter smelting, RH + LF + RH vacuum degassing treatment, calcium treatment and slab continuous casting processes, and high-purity molten steel is obtained by adopting a double-vacuum smelting process, strict calcium treatment and soft argon blowing processes, so that large-particle inclusions and hard-phase inclusions such as MnS and the like which influence cold spinning processing are not existed in the molten steel;
meanwhile, a strict covering and stacking slow cooling process is carried out on the continuous casting billet, the cover inlet temperature is set to be 600-plus-700 ℃, the covering time is 72 hours, and the cover outlet temperature is set to be 100-plus-200 ℃. The maximum diffusion of H is realized by a covering slow cooling process, and the occurrence probability of delayed cracks is reduced.
A continuous casting billet heating process: the furnace time of the heating furnace is 200-1220 min, the heat preservation temperature of the soaking section is 1180-1220 ℃, and the heat preservation time is more than or equal to 50 min; by prolonging the heat preservation time of the high-temperature section, the material homogenization is realized to the maximum extent, and the influence of the segregation band on the cold spinning material is reduced. And the high-pressure water descaling is carried out twice after the heating furnace is taken out of the furnace, so that the scale on the surface is completely removed, and the influence of poor surface quality on the cold machining process is reduced.
The rolling adopts a two-stage rolling process, wherein the first stage is a rough rolling stage, an austenite recrystallization zone is rolled, the rolling start temperature is 1080 plus 1150 ℃, the final three-time average reduction rate is more than or equal to 15 percent, the second stage is a finish rolling stage, the temperature is 2-2.5 mm, the thickness (mm) of a finished steel plate, the rolling start temperature is 900 plus 950 ℃, and the finish rolling temperature is more than or equal to 800 ℃; and during the second stage of rolling, high-pressure water descaling is respectively carried out in the first pass, the second pass and the fourth pass, and secondary iron scale is completely removed through three-pass descaling.
And (3) quickly taking off the steel plate after rolling, enabling the cover feeding temperature to be more than or equal to 300 ℃, then carrying out cover adding and stacking slow cooling for more than 48 hours, and then carrying out air cooling to room temperature, wherein the surface is not allowed to be scratched and is not allowed to be polished. The steel plate is slowly cooled by covering and piling, and further hydrogen diffusion treatment is carried out, so that the content of H existing in the steel plate is reduced, and the generation of delayed cracks after cold spinning is thoroughly eliminated.
For thin steel plates, the temperature drop speed is high, the cover can be fed only through a cooling bed after finish rolling, the cover feeding temperature in the common process is about 200 ℃, and the cover feeding temperature is required to be controlled to be more than or equal to 300 ℃.
After the steel plate manufactured by the production process is processed into a round cake shape, under the condition of a multi-pass cold spinning processing process and a compression ratio of 3.5-4 before and after spinning, the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 900MPa, the elongation A50 is more than or equal to 12 percent, and the surface is free of cracking after spinning.
The cold spinning material capable of meeting the use requirements is obtained by integrating, designing and innovating a component process system aiming at the characteristics of high homogeneity, high extension and no cracking of the cold spinning material. In the component design, the structure and the performance of the base material are ensured by microalloying low-carbon low-manganese Nb and Ti, the quantitative control requirement of harmful elements (S, H, O) is highlighted, particularly the control of the O content is highlighted, and the requirement of steel elements, particularly residual harmful elements, required by cold spinning materials can be met by accurately defining for the first time; and a specific manufacturing method is given in the manufacturing process. Secondly, in the aspect of structure performance control, the polygonal ferrite steel with low residual stress is firstly provided, the process for manufacturing the ultrahigh-strength steel plate with the strength of more than 600MPa by cold spinning is met, the verification is carried out in practice, and a specific control method is provided for the specific process required for obtaining the structure.
Compared with the prior art, the invention has the advantages that:
aiming at the special requirements of cold spinning materials, on the basis of reasonable component design, the medium plate production capable of meeting the multi-pass cold spinning processing technology is realized by pertinently designing the purity, the surface quality and the material performance of molten steel, the structure of the medium plate before spinning is a low-stress high-homogeneity polygonal ferrite structure, the yield strength is more than or equal to 400MPa, the tensile strength is 450-550MPa, and the elongation (A) is 50 ) The yield ratio is more than or equal to 50 percent, the yield ratio is less than or equal to 0.70, the grade sum of the A + B + C + D inclusions is less than or equal to 2.0, and after multi-pass spinning according to a cold spinning process with the compression ratio of 3.5-4 times, the performance can meet the requirements that the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 900MPa, and the elongation (A) is higher than 50 ) Not less than 12 percent, no surface crack, and impact energy of not less than 230J at minus 60 ℃.
Drawings
FIG. 1 is a photograph of a microstructure of low-stress polygonal ferrite of a 10mm steel plate according to an example of the present invention.
Detailed Description
The present invention is described in further detail with reference to the following examples, which should be construed as exemplary and not limiting the scope of the present invention.
Examples 1 to 2:
according to the chemical component range and the manufacturing method, the medium steel plate which can be processed in a cold spinning mode is manufactured by the process steps of converter smelting, RH vacuum decarburization, LF refining, RH vacuum degassing, calcium treatment, slab continuous casting, covering and stacking slow cooling, continuous casting billet checking and cleaning, casting billet heating, high-pressure water descaling, controlled rolling, steel plate covering and stacking slow cooling and the like, wherein the casting billet temperature is 680 ℃ (example 1) and 670 ℃ (example 2).
The specific process of the heating, rolling and cooling stages comprises the following steps: heating the continuous casting slab to 1180-; then, controlled rolling is carried out, the initial rolling temperature of the rough rolling stage is 1080-1150 ℃ (examples 1 and 2), and the average reduction rate of the last three passes is 18 percent (example 1) and 20 percent (example 2); the thickness of the finish rolling is respectively 30mm (example 1)/25mm (example 2), the rolling temperature of the finish rolling is respectively 920-.
The chemical compositions of the steel plates prepared in the examples are shown in Table 1, the mechanical properties of the steel plates are shown in Table 2, the mechanical properties of the steel plates after cold spinning are shown in Table 3, and the microstructures of the steel plates are shown in FIG. 1.
Table 1 chemical composition (wt.%) of steel sheet of example
| Examples | C | Si | Mn | Alt | S | Al | Nb | Ti | H | O | Ca | Ca/S |
| 1-1 | 0.041 | 0.12 | 1.45 | 0.025 | 0.0006 | 0.024 | 0.041 | 0.015 | 0.00008 | 0.0007 | 0.0018 | 3 |
| 1-2 | 0.043 | 0.11 | 1.42 | 0.024 | 0.0005 | 0.025 | 0.040 | 0.014 | 0.00009 | 0.0008 | 0.0015 | 3 |
| 2-1 | 0.045 | 0.12 | 1.38 | 0.031 | 0.0007 | 0.028 | 0.042 | 0.015 | 0.00010 | 0.0008 | 0.0016 | 2.28 |
| 2-2 | 0.045 | 0.12 | 1.39 | 0.033 | 0.0004 | 0.028 | 0.043 | 0.015 | 0.00008 | 0.0006 | 0.0017 | 4.25 |
TABLE 2 mechanical properties of the steel sheets of the examples
TABLE 3 mechanical properties of the steel plate spun materials of the examples
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A steel plate suitable for cold spinning processing is characterized in that: the chemical components of the steel plate are 0.04-0.06 wt.%, 0.10-0.15 wt.% of Si, 1.30-1.50 wt.% of Mn, 0.02-0.04 wt.% of Al, 0.035-0.055 wt.% of Nb, 0.01-0.02 wt.% of Ti, less than or equal to 0.0008 wt.% of S, less than or equal to 1ppm of [ H ], lessthan or equal to 8ppm of [ O ], and more than or equal to 1.5 wt.% of Ca/S; the balance being Fe and unavoidable impurities.
2. The steel plate suitable for cold spinning working according to claim 1, wherein: the steel plate is a polygonal ferrite structure, the yield strength is more than or equal to 400MPa, the tensile strength is 450-550MPa, and the elongation (A) 50 ) More than or equal to 50 percent, the yield ratio is less than or equal to 0.70, and the total grade of A + B + C + D type inclusions in the steel is less than or equal to 2.0; after cold spinning multi-pass spinning according to the compression ratio of 3.5-4 times, the performance can meet the requirements that the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 900MPa and the elongation (A) 50 ) Not less than 12 percent, and no cracking on the surface.
3. A method of manufacturing a steel plate suitable for cold spinning working according to claim 1, characterized by: the process comprises the following steps:
firstly, smelting raw materials are subjected to top-bottom blowing, RH vacuum degassing, LF refining, RH vacuum degassing and calcium treatment in sequence, casting is carried out to obtain a casting blank with the thickness of 150mm or more, and the center segregation of the casting blank meets the C0.5 level requirement; covering and stacking the casting blank for slow cooling;
heating a casting blank: the casting blank is put into a heating furnace to be heated and preserved so as to ensure that the structure is completely austenitized, alloy elements are fully dissolved in a solid solution, the structure is homogenized, and high-pressure water descaling is carried out twice after the casting blank is taken out of the furnace, so that the oxide skin on the surface of the casting blank is removed;
thirdly, rolling: two-stage rolling is adopted, the first stage is a rough rolling stage, the austenite recrystallization zone is rolled, the initial rolling temperature is 1080-; the second stage is a finish rolling stage, when the thickness of the finished steel plate is 2-2.5 times of the thickness of the finished steel plate, the initial rolling temperature is 900-950 ℃, and the final rolling temperature is more than or equal to 800 ℃; in the second stage of rolling, high-pressure water descaling is respectively carried out in the first several passes;
and fourthly, covering and stacking the rolled steel plate for slow cooling, wherein the covering temperature is more than or equal to 300 ℃, air cooling to room temperature is carried out after stacking for slow cooling, the surface is not allowed to be scratched, and grinding and shot blasting treatment are not allowed.
4. The manufacturing method of a steel plate suitable for cold spinning working according to claim 3, characterized in that: the casting blank cover inlet temperature is 600-700 ℃, the cover adding time is more than 72 hours, and the cover outlet temperature is 100-200 ℃.
5. The manufacturing method of a steel plate suitable for cold spinning working according to claim 3, characterized in that: the heat preservation temperature 1180 and 1220 ℃ of the soaking section are carried out, and the heat preservation time of the soaking section is more than or equal to 50 min.
6. The manufacturing method of a steel plate suitable for cold spinning working according to claim 3, characterized in that: and step three, in the finish rolling stage, surface descaling is carried out on the steel billet in the first pass, the second pass and the fourth pass respectively.
7. The manufacturing method of a steel plate suitable for cold spinning working according to claim 3, characterized in that: and fourthly, covering the rolled steel plate with a cover for slow cooling for more than 48 hours.
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