CN111057962B - Medium-high carbon steel 75Cr hot-rolled pickled plate and production method thereof - Google Patents
Medium-high carbon steel 75Cr hot-rolled pickled plate and production method thereof Download PDFInfo
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- CN111057962B CN111057962B CN201911414452.3A CN201911414452A CN111057962B CN 111057962 B CN111057962 B CN 111057962B CN 201911414452 A CN201911414452 A CN 201911414452A CN 111057962 B CN111057962 B CN 111057962B
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- 229910000677 High-carbon steel Inorganic materials 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 84
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 238000010583 slow cooling Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 23
- 239000010959 steel Substances 0.000 abstract description 23
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract description 21
- 238000005554 pickling Methods 0.000 abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 9
- 239000010703 silicon Substances 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- 239000011574 phosphorus Substances 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 9
- 239000002253 acid Substances 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000756 V alloy Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Classifications
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides a medium-high carbon steel 75Cr hot-rolled pickled plate and a production method thereof, belonging to the technical field of steel rolling, wherein the medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.72-0.80%, Si: 0.1-0.15%, Mn: 0.60-90%, Cr: 0.30-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, V: 0.02-0.05%, and the balance of iron and inevitable impurities; the production method comprises the following steps: preparing a plate blank, heating the plate blank in a heating furnace, removing phosphorus by high-pressure water, and rolling, cooling, coiling and slowly cooling the plate blank. According to the medium-high carbon steel 75Cr hot-rolled pickled plate, the vanadium is added into the steel to improve the strength, the silicon content in the steel is reduced, the generation of iron scales is reduced by controlling the temperature and the time, the surface quality is good after pickling, no quality defect occurs on the surface, and the production requirement of the pickled plate is met.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a medium-high carbon steel 75Cr hot-rolled pickled plate and a production method thereof.
Background
The hot-rolled pickled plate is characterized in that the hot-rolled coiled plate is treated by a pickling unit to remove iron oxide scales on the surface of the hot-rolled coiled plate, the surface of the hot-rolled coiled plate is coated with oil to meet the use requirement of part of cold-rolled plates, and the pickled plate has the advantages of high surface quality, good size precision control, lower selling price compared with the cold-rolled plate and higher market demand.
The pickling plate mainly produces low-carbon steel under general conditions, the surface requirement of the pickling plate is high, and the surface pickling quality of the medium-high carbon steel 75Cr hot-rolled steel coil is influenced by the composition, structural characteristics and thickness of iron scales on the surface of the hot-rolled strip steel in the process of producing the medium-high carbon steel. The surface color is dark after the hot-rolled coil is subjected to acid washing, and the iron scale of the acid-washed plate can not be washed cleanly due to serious conditions. When the oxide scales on the surface of the hot rolled plate are pickled, the difficulty of pickling is mainly determined byFe3O4Content and structure of (a). The cooling speed of the strip steel edge is high, and the generated FeO generates eutectoid reaction, namely 4FeO is Fe3O4+ Fe, promoting Fe3O4The scale at the edge of the strip steel has higher density and is tightly combined with the steel plate matrix, which is not beneficial to acid cleaning. In the pickling process of the medium-high carbon steel 75Cr hot rolled steel coil, the yield of a pickled plate product is seriously influenced due to the surface quality problem.
Disclosure of Invention
The invention aims to provide a medium-high carbon steel 75Cr hot-rolled pickled plate and a production method thereof, and aims to solve the technical problem that the yield of a pickled plate product is seriously influenced due to the surface quality problem in the production process of the medium-high carbon steel 75Cr pickled plate.
In order to achieve the purpose, the invention adopts the technical scheme that: the medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components: c: 0.72-0.80%, Si: 0.1-0.15%, Mn: 0.60-90%, Cr: 0.30-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, V: 0.02-0.05%, and the balance of iron and inevitable impurities.
The invention also aims to provide a production method of the medium-high carbon steel 75Cr hot-rolled pickled plate, which comprises the following steps:
preparing a plate blank: preparing a medium-high carbon steel 75Cr hot-rolled pickled plate slab having the composition of the medium-high carbon steel 75Cr hot-rolled pickled plate of claim 1;
heating the plate blank: heating the plate blank in a heating furnace at 1180-1250 ℃ for 130-190 minutes; wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃;
descaling by high-pressure water: taking the plate blank out of the heating furnace, and then carrying out high-pressure water dephosphorization;
rolling and cooling: rolling and cooling the slab;
coiling: and coiling the cooled plate blank.
As another embodiment of the application, the thickness of the plate blank is 2-16 mm.
In another embodiment of the present invention, in the slab heating step, when the slab has a thickness of 2 to 6mm, the heating time is 130 to 150 minutes, and the heating temperature is 1180 to 1200 ℃; when the thickness of the slab is 6-12 mm, the heating time is 150-170 minutes, and the heating temperature is 1200-1220 ℃; when the thickness of the medium-high carbon steel 75Cr hot-rolled pickled plate is 12-16 mm, the heating time is 170-190 minutes, and the heating temperature is 1220-1250 ℃.
As another embodiment of the present application, the coiling temperature is 690-760 ℃.
As another embodiment of the application, the slab is slowly cooled in a slow cooling pit for 40-55 h after being coiled.
As another embodiment of the present application, the rolling includes: and (3) rolling the slab subjected to dephosphorization by high-pressure water by a roughing mill and a finishing mill in sequence.
As another embodiment of the application, the outlet temperature of the roughing mill is 1020-1070 ℃.
As another embodiment of the application, the outlet temperature of the finishing mill is 880-910 ℃.
As another embodiment of the present application, the slab is subjected to five passes in the roughing mill and seven passes in the finishing mill.
The medium-high carbon steel 75Cr hot-rolled pickled plate and the production method thereof have the beneficial effects that: compared with the prior art, the medium-high carbon steel 75Cr hot-rolled pickled plate provided by the invention has the advantages that the vanadium is added into the steel to improve the strength, the silicon content in the steel is reduced, and the SiO is reduced2The generation of viscous oxide reduces the generation of iron scale by controlling the temperature and the time, the surface quality of the medium-high carbon steel 75Cr hot-rolled pickled plate is good after pickling, the surface does not have quality defects, and the production requirement of the pickled plate is met.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a medium-high carbon steel 75Cr hot-rolled pickled plate. The medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.72-0.80%, Si: 0.1-0.15%, Mn: 0.60-90%, 0.30-0.60% of Cr, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.02-0.05% of V, and the balance of iron and inevitable impurities.
The component proportion of the invention is suitable for the production of medium-high carbon steel 75Cr hot-rolled pickled plates, and in the production process of the traditional medium-high carbon steel 75Cr pickled plates, iron scales and Fe are formed on the surfaces of steel strips due to heating3O4The growth of the acid pickling line ensures that the iron scale at the edge of the strip steel is compact, and the iron scale is not easy to remove in the acid pickling process, thereby influencing the surface quality of the acid pickling plate. In the traditional 75Cr tool steel production process, the performance of the product is ensured mainly by strengthening through carbon, silicon and manganese, and because the silicon and manganese contents in the components are higher, viscous oxides generated after oxidation are attached to the surface of a steel coil, the scale is difficult to remove in the rolling process, and the appearance after acid washing is more obvious. In the embodiment, the silicon content in the steel is reduced as much as possible in the aspect of component design, and SiO is reduced2The generation of viscous oxide, but the reduction of the silicon content can reduce the strength of the steel, so the vanadium alloy with specific content is added into the steel to improve the strength, the generation of iron scale in the heating process is reduced, the surface can not have quality defects after the pickling, and the production requirement of the pickled plate is met.
Vanadium is a strong stabilizer, can improve the crystal structure of the alloy, and can improve the high-temperature stability, heat resistance and the like; vanadium is added into the medium-high carbon steel 75Cr hot-rolled pickled plate, so that the medium-high carbon steel 75Cr hot-rolled pickled plate has the effects of grain refinement and precipitation strengthening, and the tensile strength is obviously improved; according to the invention, by coordinating the silicon and vanadium contents in the medium-high carbon steel 75Cr hot-rolled pickled plate, the pickled plate has ideal strength and toughness, meanwhile, the generation of scale on the surface of the plate blank is reduced, and the pickled plate has good surface quality after pickling. In the invention, other elements are used for compensating the strength reduction caused by the reduction of the silicon content, but the yield strength of the pickled plate is below 400MPa, the Rockwell hardness is above 40, and the elongation is less than or equal to 9 percent, so that the effect of the technical scheme of the invention cannot be achieved.
The invention also aims to provide a production method of the medium-high carbon steel 75Cr hot-rolled pickled plate, which comprises the following steps:
preparing a plate blank: preparing a medium-high carbon steel 75Cr hot-rolled pickled plate blank consisting of any one of the above components;
heating the plate blank: placing the plate blank in a heating furnace for heating, wherein the heating temperature is 1180-1250 ℃, and the heating time is 130-190 minutes; wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃;
descaling by high-pressure water: taking the plate blank out of the heating furnace, and then carrying out high-pressure water dephosphorization;
rolling and cooling: rolling and cooling the plate blank;
coiling: and coiling the cooled slab.
The production method of the medium-high carbon steel 75Cr hot-rolled pickled plate provided by the invention has the beneficial effects that: compared with the prior art, the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate further reduces SiO by controlling the temperature and the time2The generation of viscous oxide reduces the generation of iron scale in the heating process, so that the surface quality of the medium-high carbon steel 75Cr hot-rolled pickled plate is good after pickling, the surface has no quality defect, and the production requirement of the pickled plate is met.
As a specific implementation mode of the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate, the thickness of the plate blank is 2-16 mm.
In order to ensure the quality of the medium-high carbon steel 75Cr hot-rolled pickled plate, the heating time and temperature of different quality product thicknesses are different in the plate blank heating process, when the thickness of the plate blank is 2-6 mm, the heating time is 130-150 minutes, and the heating temperature is 1180-1200 ℃; when the thickness of the slab is 6-12 mm, the heating time is 150-170 minutes, and the heating temperature is 1200-1220 ℃; when the thickness of the slab is 12-16 mm, the heating time is 170-190 minutes, and the heating temperature is 1220-1250 ℃.
As a specific implementation mode of the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate, the coiling temperature is 690-760 ℃.
As a specific implementation mode of the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate, a plate blank is slowly cooled in a slow cooling pit for 40-55 h after being coiled; preferably, the slab is slowly cooled in a slow cooling pit for 48 hours after being coiled.
As a specific implementation mode of the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate provided by the invention, the rolling process comprises the following steps: and (3) rolling the slab subjected to dephosphorization by high-pressure water by a roughing mill and a finishing mill in sequence.
In this embodiment, the slab subjected to dephosphorization with high-pressure water is subjected to rough rolling, a hot coil box and finish rolling in sequence to obtain a hot rolled plate.
As a specific implementation mode of the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate, the outlet temperature of a roughing mill is 1020-1070 ℃; the outlet temperature of the finishing mill is 880-910 ℃; the slab is rolled for five times in a roughing mill and for seven times in a finishing mill.
In order to more specifically explain the technical solution of the present invention, the following examples are given for the purpose of detailed explanation.
Example 1
The medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.72%, Si: 0.10%, Mn: 0.60%, Cr: 0.3%, P: 0.015%, S: 0.010 percent of the total weight of the alloy, 0.02 percent of V and the balance of iron and inevitable impurities; preparing a qualified plate blank which is prepared from the components and is produced by extracting vanadium from a 150-ton converter, smelting the vanadium from the 150-ton converter, refining the vanadium from the LF and continuously casting the plate blank; placing the plate blank in a heating furnace for heating, wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃, the heating temperature of the plate blank in the heating furnace is 1180 ℃, the heating time is 130 minutes, then removing the plate blank from the heating furnace, carrying out high-pressure water dephosphorization after the plate blank is roughly rolled for 5 times by a roughing mill, then leading the plate blank to have the outlet temperature of 1020 ℃, passing through a hot coil box, and then carrying out finish rolling for 7 times by a finishing mill, wherein the outlet temperature is 880 ℃, carrying out dispersed cooling, and the coiling temperature is 690 ℃, thus obtaining the qualified medium-high carbon steel 75Cr hot-rolled pickled plate with the thickness of 2.0mm, the width of 1250mm, the yield strength of 435MPa, the Rockwell hardness of 25 and the elongation of 10%, wherein no defect is found.
Example 2
The medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.74%, Si: 0.12%, Mn: 0.70%, Cr: 0.4%, P: 0.013%, S: 0.009%, 0.03% of V, and the balance of Fe and inevitable impurities; preparing a qualified plate blank which is prepared from the components and is produced by extracting vanadium from a 150-ton converter, smelting the vanadium from the 150-ton converter, refining the vanadium from the LF and continuously casting the plate blank; placing the plate blank in a heating furnace for heating, wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃, the heating time of the plate blank in the heating furnace is 150 minutes, the heating temperature is 1190 ℃, then the plate blank is taken out of the heating furnace and is subjected to high-pressure water dephosphorization, the outlet temperature is 1030 ℃ after the plate blank is roughly rolled for 5 times by a roughing mill, the outlet temperature is 890 ℃ after the plate blank passes through a hot coil box and is subjected to finish rolling for 7 times by a finishing mill, the plate blank is subjected to dispersive cooling, the coiling temperature is 700 ℃, and the qualified medium-high carbon steel 75Cr hot-rolled pickled plate with the thickness of 6.0mm, the width of 1250mm, the yield strength of 455MPa, the Rockwell hardness of 29 and the elongation of 11% is obtained, no.
Example 3
The medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.76%, Si: 0.13%, Mn: 0.80%, Cr: 0.5%, P: 0.012%, S: 0.008 percent of the total weight of the alloy, 0.04 percent of V and the balance of iron and inevitable impurities; preparing a qualified plate blank which is prepared from the components and is produced by extracting vanadium from a 150-ton converter, smelting the vanadium from the 150-ton converter, refining the vanadium from the LF and continuously casting the plate blank; the method comprises the steps of heating a plate blank in a heating furnace, wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃, the heating time of the plate blank in the heating furnace is 170 minutes, the heating temperature is 1220 ℃, the plate blank is taken out of the heating furnace and is subjected to high-pressure water dephosphorization, the outlet temperature is 1050 ℃ after the plate blank is roughly rolled for 5 times by a roughing mill, the outlet temperature is 900 ℃ after the plate blank is finely rolled by a finishing mill for 7 times, the plate blank is subjected to dispersion cooling, the coiling temperature is 720 ℃, and the qualified medium-high carbon steel 75Cr hot-rolled pickled plate with the thickness of 9.0mm, the width of 1250mm, the yield strength of 450MPa, the Rockwell hardness of 28 and the elongation of 12% is obtained, no defect is found on the surface.
Example 4
The medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.78%, Si: 0.14%, Mn: 0.90%, Cr: 0.6%, P: 0.011%, S: 0.006%, V0.05%, and the balance of iron and inevitable impurities; preparing a qualified plate blank which is prepared from the components and is produced by extracting vanadium from a 150-ton converter, smelting the vanadium from the 150-ton converter, refining the vanadium from the LF and continuously casting the plate blank; placing a plate blank in a heating furnace for heating, wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃, the heating time of the plate blank in the heating furnace is 180 minutes, the heating temperature is 1240 ℃, then the plate blank is taken out of the heating furnace and is subjected to high-pressure water dephosphorization, the outlet temperature is 1060 ℃ after the plate blank is roughly rolled for 5 times by a roughing mill, the outlet temperature is 900 ℃ after the plate blank is subjected to finish rolling by a finishing mill for 7 times, the outlet temperature is 900 ℃, the plate blank is subjected to dispersed cooling, the coiling temperature is 740 ℃, and the qualified medium-high carbon steel 75Cr hot-rolled pickled plate with the thickness of 12.0mm, the width of 1250mm, the yield strength of 470MPa, the Rockwell hardness of 24 and the elongation of 11% is obtained, no
Example 5
The medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.80%, Si: 0.15%, Mn: 0.90%, Cr: 0.5%, P: 0.010%, S: 0.005%, V0.05%, and the balance of iron and inevitable impurities; preparing a qualified plate blank which is prepared from the components and is produced by extracting vanadium from a 150-ton converter, smelting the vanadium from the 150-ton converter, refining the vanadium from the LF and continuously casting the plate blank; and (2) placing the plate blank into a heating furnace for heating, wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃, the heating time of the plate blank in the heating furnace is 190 minutes, the heating temperature is 1250 ℃, the plate blank is taken out of the heating furnace and then subjected to high-pressure water dephosphorization, the outlet temperature is 1070 ℃ after being roughly rolled for 5 times by a roughing mill, the outlet temperature is 910 ℃ after passing through a hot coil box and then being finely rolled for 7 times by a finishing mill, the plate blank is subjected to dispersive cooling, the coiling temperature is 760 ℃, and the qualified medium-high carbon steel 75Cr hot-rolled pickled plate with the thickness of 16.0mm, the width of 1250mm, the yield strength of 460MPa, the Rockwell hardness of 27 and the elongation of 11% is obtained, no defect is found on.
It should be noted that in the above five examples, during the production of the medium-high carbon steel 75Cr pickled plate, the molten steel is continuously cast to obtain five slabs, each of the five slabs comprises C, Si, Mn, Cr, P, S, V, iron and inevitable impurities, the mass percentages of the five examples are shown in table 1, the heating times and the heating temperatures of the slabs obtained in the five examples are shown in table 2, and the properties of the medium-high carbon steel 75Cr hot-rolled pickled plate finished products obtained in the five examples are shown in table 3:
TABLE 1
TABLE 2
TABLE 3
As can be seen from tables 1, 2 and 3, the medium-high carbon steel 75Cr hot-rolled pickled plate manufactured by the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate of the present invention has high yield strength, elongation and low rockwell hardness; by comparing the example 4 with the example 5, the same percentage by weight of the vanadium element can be added to obtain the same elongation of medium-high carbon steel 75Cr hot-rolled pickled plates with different thicknesses; as can be seen from comparison of examples 1 to 5, when the content of the V element is 0.04% by weight, the property of the hot-rolled pickled medium-and-high-carbon steel 75Cr sheet having a thickness of 9 mm is improved most.
In a word, the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate is suitable for producing the medium-high carbon steel 75Cr hot-rolled pickled plate, and the method reduces the silicon content in the steel and the SiO in the component design as much as possible2The generation of viscous oxides and the surface pit phenomenon avoid the reduction of the steel strength, and vanadium alloy is added into the steel to improve the strength; the heating time is controlled to be 130-190 minutes, the heating temperature is controlled to be 1180-1250 ℃, the thickness of the steel coil is 2-16 mm, the yield strength is more than or equal to 400MPa, the Rockwell hardness is less than or equal to 30, and the elongation is more than or equal to 9%; the production of iron scale in the heating process is reduced, the surface of the pickled plate can not have quality defects after the pickled plate is washed, and the production requirements of the pickled plate are met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The production method of the medium-high carbon steel 75Cr hot-rolled pickled plate is characterized in that the medium-high carbon steel 75Cr hot-rolled pickled plate comprises the following components in percentage by weight: c: 0.72-0.80%, Si: 0.1-0.15%, Mn: 0.60-90%, Cr: 0.30-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, V: 0.02-0.05%, and the balance of iron and inevitable impurities;
the production method of the medium-high carbon steel 75Cr hot-rolled pickled plate specifically comprises the following steps:
preparing a plate blank: preparing a plate blank containing the components of the medium-high carbon steel 75Cr hot-rolled pickled plate, wherein the thickness of the plate blank is 2-16 mm;
heating the plate blank: heating the plate blank in a heating furnace at 1180-1250 ℃ for 130-190 minutes; wherein the temperature of the plate blank entering the heating furnace is more than or equal to 400 ℃;
descaling by high-pressure water: taking the plate blank out of the heating furnace and then carrying out high-pressure water descaling;
rolling and cooling: rolling and cooling the slab;
coiling: coiling the cooled plate blank;
the rolling process sequentially comprises five rolling passes of a roughing mill and seven rolling passes of a finishing mill, wherein the outlet temperature of the roughing mill is 1020-1070 ℃, and the outlet temperature of the finishing mill is 880-910 ℃.
2. The method for producing a medium-high carbon steel 75Cr hot-rolled pickled plate as claimed in claim 1, wherein in the slab heating step, when the thickness of the slab is 2mm or more and less than 6mm, the heating time is 130 to 150 minutes, and the heating temperature is 1180 to 1200 ℃; when the thickness of the plate blank is more than or equal to 6mm and less than 12mm, the heating time is 150-170 minutes, and the heating temperature is 1200-1220 ℃; when the thickness of the plate blank is more than or equal to 12mm and less than or equal to 16mm, the heating time is 170-190 minutes, and the heating temperature is 1220-1250 ℃.
3. The method for producing the medium-high carbon steel 75Cr hot-rolled pickled plate as claimed in claim 2, wherein the coiling temperature is 690-760 ℃.
4. The method for producing the medium-high carbon steel 75Cr hot-rolled pickled plate as claimed in claim 3, wherein the plate blank is slowly cooled in a slow cooling pit for 40-55 h after being coiled.
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| JP3543200B2 (en) * | 1994-07-04 | 2004-07-14 | 日新製鋼株式会社 | Manufacturing method of steel sheet for metal saw substrate |
| US9133532B2 (en) * | 2010-09-16 | 2015-09-15 | Posco | High-carbon hot-rolled steel sheet, high-carbon cold-rolled steel sheet, and method of manufacturing the same |
| CN102787270B (en) * | 2012-08-22 | 2014-08-27 | 武汉钢铁(集团)公司 | Thin hot-rolled pickled steel with good formability and production method thereof |
| CN103643122B (en) * | 2013-12-23 | 2016-01-20 | 河北钢铁股份有限公司唐山分公司 | The 75Cr hot-rolled sheet coil that a kind of CSP is produced and method thereof |
| CN105238995B (en) * | 2014-06-11 | 2017-08-11 | 鞍钢股份有限公司 | A kind of shaped by fluid pressure steel pipe hot rolling acid-cleaning plate and its manufacture method |
| CN105568149B (en) * | 2014-10-30 | 2018-03-27 | Posco公司 | The excellent high-carbon hot-rolled steel sheet of anti-temper brittleness and its manufacture method |
| CN105063492B (en) * | 2015-08-13 | 2017-10-13 | 武汉钢铁有限公司 | Hot-strip of automobile friction and preparation method thereof |
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