CN115354127A - Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate - Google Patents
Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a preparation method of a 700 MPa-grade rare earth high-strength high-toughness steel plate, which comprises the following steps: the heating temperature of the steel billet is 1200 plus or minus 20 ℃, and the complete austenitizing temperature is reached, so that the slab structure is completely austenitized; the finishing temperature is 820 +/-15 ℃, the finish rolling is ensured to be rolled in a temperature region which is not recrystallized completely, the austenite crystal grains only undergo a fragmentation process, and the refinement of the crystal grains is ensured; an off-line quenching and tempering heat treatment process is adopted, the off-line quenching temperature is 910 +/-10 ℃, the heat preservation time is 20min, the tempering temperature is 640 +/-10 ℃, and the heat preservation time is 40min. The invention ensures that the steel plate has the specified strength and plasticity, and in order to meet the use and stability of equipment (mainly mine cars) in a low-temperature environment, the prepared steel plate can obviously enhance the low-temperature impact toughness of the steel plate, so that the steel plate still has high impact energy at low temperature (-60 ℃), and the frame is prevented from brittle fracture at low temperature.
Description
Technical Field
The invention relates to a preparation method of a 700 MPa-grade rare earth high-strength high-toughness steel plate.
Background
At present, application number 202010155502.7 discloses a Q690D steel plate for non-preheating welding coal mine machinery and a preparation method thereof. Through reasonable component design and production process, the performance of the steel plate is improved, and the welding performance without prewelding is achieved. The invention emphasizes that the low-temperature impact toughness of the steel plate is increased by adding rare earth, and the impact energy is improved by about 70J compared with that of the steel plate in the patent of-60 ℃.
Application number 201811342554.4 discloses a Q690D thick plate produced by an ultra-fast cooling process and a manufacturing method thereof. The key points are that the production flow is simplified and the production cost is reduced by component design and ultra-fast cooling. The patent emphasizes rare earth modified inclusions, improves low-temperature impact toughness by means of molten steel purification and the like, and meets the requirement of stable use of the mining vehicle in a low-temperature environment.
Application number 202110301109.9 discloses a high-strength Q690D steel plate and a production method thereof. The high-strength steel plate with excellent performance is obtained by introducing reasonable component design and an ACC (accelerated cooling control) tempering process. The special material is added with rare earth, the impact work at minus 60 ℃ reaches the impact work value of a contrast patent at minus 20 ℃ within the same strength range, and the low-temperature impact toughness is obviously improved.
Disclosure of Invention
The invention aims to provide a preparation method of a 700 MPa-grade rare earth high-strength high-toughness steel plate, which ensures that the steel plate has specified strength and plasticity, and must have good low-temperature impact toughness to meet the use and stability of equipment (mainly mining vehicles) in a low-temperature environment, so as to prevent the frame from brittle fracture at low temperature; the high-strength high-toughness steel plate prepared by the invention can obviously enhance the low-temperature impact toughness of the steel plate, so that the steel plate still has high impact energy at low temperature (-60 ℃).
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention discloses a preparation method of a 700 MPa-level rare earth high-strength high-toughness steel plate, which comprises the following steps:
the heating temperature of the steel billet is 1200 plus or minus 20 ℃, and the complete austenitizing temperature is reached, so that the slab structure is completely austenitized;
the finishing temperature is 820 +/-15 ℃, the finish rolling is ensured to be rolled in a temperature region which is not recrystallized completely, the austenite crystal grains only undergo a fragmentation process, and the refinement of the crystal grains is ensured;
an off-line quenching and tempering heat treatment process is adopted, the off-line quenching temperature is 910 +/-10 ℃, the heat preservation time is 20min, the steel plate is fully austenitized, the alloy is fully dissolved, and the reasonable heat preservation time can obtain fine austenite grains, so that fine martensite grains are obtained after quenching; the tempering temperature is 640 +/-10 ℃, the heat preservation time is 40min, the martensite lath bundles are combined through high-temperature tempering, the lath boundary disappears, cementite is granulated, a tempered sorbite structure is obtained, the internal stress of the steel is removed, the plate shape is ensured, and the strength and toughness of the steel are improved.
Further, the high-strength high-toughness steel plate comprises the following chemical components in percentage by mass: c:0.05 to 0.07%, si:0.10 to 0.20%, mn:1.40 to 1.60%, P: less than or equal to 0.010 percent, S: less than or equal to 0.005%, cr:0.15 to 0.25%, ni:0.55 to 0.65%, mo:0.20 to 0.30%, nb:0.010 to 0.020%, ti: 0.010-0.020%, V:0.020 to 0.030%, al:0.030 to 0.050%, RE:0.0010 to 0.0030, and the balance of Fe and inevitable impurities, wherein the mass fraction is 100 percent.
Further, the method specifically comprises the following steps: molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements which are not easy to oxidize are added, LF refining is carried out, mn and Nb elements are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added firstly, then B is added, and the phenomenon that B elements which are too much fixed by N elements form BN is prevented, so that the hardenability of B is reduced; finally, rare earth elements are added to prevent rare earth from being oxidized to form rare earth inclusions; forming a fixed-length plate blank by the molten steel through a casting machine; cold charging of the plate blank into a furnace, wherein the furnace time is 206min, and the discharging temperature is 1205 ℃; removing phosphorus by using high-pressure water, rolling to 12mm by using a rough rolling and reversible finishing mill, controlling the finishing temperature of finish rolling to be 825 ℃, and controlling the final cooling temperature to be 683 ℃; cooling the steel plate to room temperature, performing off-line heat treatment, wherein the quenching heating temperature is 909 ℃, and the heat preservation time is 18min after the core of the steel plate reaches the quenching temperature; the tempering temperature is 642 ℃, and the temperature of the steel plate is kept for 41min after the steel plate reaches the tempering temperature.
Further, the method specifically comprises the following steps: molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements which are not easy to oxidize are added, LF refining is carried out, mn and Nb elements are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added firstly, then B is added, and the phenomenon that B elements which are too much fixed by N elements form BN is prevented, so that the hardenability of B is reduced; finally, rare earth elements are added to prevent rare earth from being oxidized to form rare earth inclusions; forming a fixed-length plate blank by the molten steel through a casting machine; cold loading the plate blank into a furnace, wherein the furnace time is 215min, and the discharging temperature is 1200 ℃; removing phosphorus by using high-pressure water, rolling to 32mm by using a rough rolling and reversible finishing mill, controlling the finishing temperature of finish rolling to 819 ℃ and controlling the final cooling temperature to 678 ℃; cooling the steel plate to room temperature, performing off-line heat treatment, wherein the quenching heating temperature is 908 ℃, and keeping the temperature for 19min after the core of the steel plate reaches the quenching temperature; the tempering temperature is 637 ℃, and the steel plate is kept for 38min after reaching the tempering temperature.
Further, the method specifically comprises the following steps: molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements which are not easy to oxidize are added, LF refining is then carried out, mn and Nb elements are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added firstly, and B is added secondly, so that the B element with excessive N element fixation is prevented from forming BN, and the hardenability of B is reduced; finally, rare earth elements are added to prevent rare earth from being oxidized to form rare earth inclusions; forming a fixed-length plate blank by the molten steel through a casting machine; cold charging the plate blank into the furnace, wherein the furnace time is 225min, and the tapping temperature is 1208 ℃; removing phosphorus by using high-pressure water, rolling to 46mm by using a rough rolling and reversible finishing mill, controlling the finishing temperature of finish rolling to be 815 ℃, and controlling the final cooling temperature to be 674 ℃; after the temperature of the steel plate is reduced to room temperature, carrying out off-line heat treatment, wherein the quenching heating temperature is 911 ℃, and the heat preservation time is 17min after the core part of the steel plate reaches the quenching temperature; the tempering temperature is 641 ℃, and the temperature of the steel plate is kept for 37min after reaching the tempering temperature.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the invention, through adding the rare earth element and cooperating with the process, the high-strength steel achieves the specified strength range, has good low-temperature impact toughness, and is helpful for crack arrest of the steel plate.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows a metallographic structure of a steel plate;
FIG. 2 is a macroscopic morphology of rare earth with inclusions improved;
FIG. 3 shows the appearance of the impact fracture of the steel plate after rare earth addition.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1:
molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements such as Ni, mo and Cr which are not easy to oxidize are added, LF refining is carried out, elements such as Mn and Nb are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added first, then B is added, B elements which are too much fixed by N elements are prevented from forming BN, and the hardenability of B is reduced. And finally, adding rare earth elements to prevent rare earth from being oxidized to form rare earth inclusions. And forming the molten steel into a fixed-length plate blank by a casting machine. And (3) cold charging the slab into a furnace, wherein the in-furnace time is 206min, and the tapping temperature is 1205 ℃. After removing phosphorus by high-pressure water, rolling the steel plate to 12mm by a rough rolling and reversible finishing mill, controlling the finishing temperature of finish rolling to be 825 ℃ and the final cooling temperature to be 683 ℃. And (3) cooling the steel plate to room temperature, then carrying out off-line heat treatment, wherein the quenching heating temperature is 909 ℃, and the core of the steel plate is kept for 18min after reaching the quenching temperature. The tempering temperature is 642 ℃, and the temperature of the steel plate is kept for 41min after the steel plate reaches the tempering temperature. And (5) detecting the mechanical property of the steel plate.
Example 2:
molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements such as Ni, mo and Cr which are not easy to oxidize are added, LF refining is carried out, elements such as Mn and Nb are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added first, then B is added, B elements which are too much fixed by N elements are prevented from forming BN, and the hardenability of B is reduced. And finally, adding rare earth elements to prevent rare earth from being oxidized to form rare earth inclusions. And forming the molten steel into a fixed-length plate blank by a casting machine. The slab is cold charged into the furnace, the in-furnace time is 215min, and the tapping temperature is 1200 ℃. After removing phosphorus by high-pressure water, rolling the steel plate to 32mm by a rough rolling and reversible finishing mill, controlling the finishing temperature of finish rolling to 819 ℃ and controlling the finishing temperature to 678 ℃. And (3) cooling the steel plate to room temperature, performing off-line heat treatment, wherein the quenching heating temperature is 908 ℃, and keeping the temperature for 19min after the core of the steel plate reaches the quenching temperature. The tempering temperature is 637 ℃, and the temperature of the steel plate is kept for 38min after reaching the tempering temperature. And (5) detecting the mechanical property of the steel plate.
Example 3:
molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements such as Ni, mo and Cr which are not easy to oxidize are added, LF refining is carried out, elements such as Mn and Nb are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added first, then B is added, B elements which are too much fixed by N elements are prevented from forming BN, and the hardenability of B is reduced. And finally, adding rare earth elements to prevent rare earth from being oxidized to form rare earth inclusions. And forming the molten steel into a fixed-length plate blank by a casting machine. And (3) cold charging the plate blank into a furnace, wherein the in-furnace time is 225min, and the tapping temperature is 1208 ℃. After removing phosphorus by high-pressure water, rolling the steel plate to 46mm by a rough rolling and reversible finishing mill, controlling the finishing temperature of finish rolling to be 815 ℃ and controlling the finishing temperature to be 674 ℃. And (3) cooling the steel plate to room temperature, performing off-line heat treatment, wherein the quenching heating temperature is 911 ℃, and the heat preservation is carried out for 17min after the core part of the steel plate reaches the quenching temperature. The tempering temperature is 641 ℃, and the temperature of the steel plate is kept for 37min after reaching the tempering temperature. And (5) detecting the mechanical property of the steel plate.
The chemical composition content of each example is shown in table 1; the heating process parameters are shown in table 2; the heat treatment process parameters are shown in Table 3; the mechanical properties of the high-strength steel plate parent metal are shown in Table 4.
TABLE 1 chemical composition of the smelt (wt%)
| Examples | C | Si | Mn | P | S | Al | Cr |
| 1 | 0.062 | 0.11 | 1.53 | 0.009 | 0.002 | 0.042 | 0.18 |
| 2 | 0.058 | 0.12 | 1.55 | 0.008 | 0.001 | 0.038 | 0.22 |
| 3 | 0.061 | 0.13 | 1.48 | 0.009 | 0.002 | 0.046 | 0.20 |
| Examples | Ni | Mo | Nb | V | Ti | RE | |
| 1 | 0.61 | 0.28 | 0.013 | 0.025 | 0.015 | 0.0013 | |
| 2 | 0.60 | 0.22 | 0.015 | 0.028 | 0.012 | 0.0022 | |
| 3 | 0.58 | 0.24 | 0.011 | 0.026 | 0.011 | 0.0028 |
TABLE 2 heating Process parameters
TABLE 3 Heat treatment Process parameters
| Examples | Quenching temperature DEG C | Holding time min | Tempering temperature DEG C | Holding time min |
| 1 | 909 | 18 | 642 | 41 |
| 2 | 908 | 19 | 637 | 38 |
| 3 | 911 | 17 | 641 | 37 |
TABLE 4 mechanical Properties of the Steel sheets
The above-mentioned embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. A preparation method of a 700 MPa-level rare earth high-strength high-toughness steel plate is characterized by comprising the following steps:
the heating temperature of the steel billet is 1200 plus or minus 20 ℃, and the complete austenitizing temperature is reached, so that the slab structure is completely austenitized;
the finishing temperature is 820 +/-15 ℃, the finish rolling is ensured to be rolled in a temperature region which is not recrystallized completely, the austenite crystal grains only undergo a fragmentation process, and the refinement of the crystal grains is ensured;
an off-line quenching and tempering heat treatment process is adopted, the off-line quenching temperature is 910 +/-10 ℃, the heat preservation time is 20min, the steel plate is fully austenitized, the alloy is fully dissolved, the heat preservation time is reasonable, fine austenite grains can be obtained, and fine martensite grains are obtained after quenching; the tempering temperature is 640 +/-10 ℃, the heat preservation time is 40min, the martensite lath bundles are combined through high-temperature tempering, the lath boundary disappears, cementite is granulated, a tempered sorbite structure is obtained, the internal stress of the steel is removed, the plate shape is ensured, and the strength and toughness of the steel are improved.
2. The preparation method of the 700 MPa-grade rare earth high-strength high-toughness steel plate according to claim 1, wherein the high-strength high-toughness steel plate comprises the following chemical components in percentage by mass: c:0.05 to 0.07%, si:0.10 to 0.20%, mn:1.40 to 1.60%, P: less than or equal to 0.010%, S: less than or equal to 0.005 percent, cr:0.15 to 0.25%, ni:0.55 to 0.65%, mo:0.20 to 0.30%, nb:0.010 to 0.020%, ti: 0.010-0.020%, V:0.020 to 0.030%, al:0.030 to 0.050%, RE:0.0010 to 0.0030, and the balance of Fe and inevitable impurities, wherein the mass fraction is 100 percent.
3. The preparation method of the 700 MPa-grade rare earth high-strength high-toughness steel plate according to claim 1, which is characterized by comprising the following steps of: molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements which are not easy to oxidize are added, LF refining is then carried out, mn and Nb elements are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added firstly, and B is added secondly, so that the B element with excessive N element fixation is prevented from forming BN, and the hardenability of B is reduced; finally, rare earth elements are added to prevent rare earth from being oxidized to form rare earth inclusions; forming a fixed-length plate blank by the molten steel through a casting machine; cold charging of the plate blank into a furnace, wherein the furnace time is 206min, and the discharging temperature is 1205 ℃; after dephosphorization is carried out by high-pressure water, rolling the steel plate to 12mm by a rough rolling and reversible finishing mill, wherein the finishing temperature of the finish rolling is controlled at 825 ℃, and the final cooling temperature is 683 ℃; cooling the steel plate to room temperature, and then carrying out off-line heat treatment, wherein the quenching heating temperature is 909 ℃, and the heat preservation time is 18min after the core of the steel plate reaches the quenching temperature; the tempering temperature is 642 ℃, and the temperature of the steel plate is kept for 41min after the steel plate reaches the tempering temperature.
4. The preparation method of the 700 MPa-grade rare earth high-strength high-toughness steel plate according to claim 1, which is characterized by comprising the following steps of: molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements which are not easy to oxidize are added, LF refining is carried out, mn and Nb elements are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added firstly, then B is added, and the phenomenon that B elements which are too much fixed by N elements form BN is prevented, so that the hardenability of B is reduced; finally, rare earth elements are added to prevent rare earth from being oxidized to form rare earth inclusions; forming a fixed-length plate blank by molten steel through a casting machine; cold charging the plate blank into a furnace, wherein the furnace time is 215min, and the tapping temperature is 1200 ℃; after removing phosphorus by high-pressure water, rolling the steel plate to 32mm by a rough rolling and reversible finishing mill, wherein the finishing temperature of finish rolling is controlled to 819 ℃, and the finishing temperature is 678 ℃; cooling the steel plate to room temperature, and then carrying out off-line heat treatment, wherein the quenching heating temperature is 908 ℃, and the heat preservation time is 19min after the core part of the steel plate reaches the quenching temperature; the tempering temperature is 637 ℃, and the temperature of the steel plate is kept for 38min after reaching the tempering temperature.
5. The preparation method of the 700MPa grade rare earth high-strength high-toughness steel plate as claimed in claim 1, wherein the method specifically comprises the following steps: molten iron enters a converter for decarburization and desulfurization after desulfurization pretreatment, alloy elements which are not easy to oxidize are added, LF refining is then carried out, mn and Nb elements are added to ensure the temperature of the molten steel, RH refining is carried out for vacuum treatment, V, ti, B and rare earth are added, ti is added firstly, and B is added secondly, so that the B element with excessive N element fixation is prevented from forming BN, and the hardenability of B is reduced; finally, rare earth elements are added to prevent rare earth from being oxidized to form rare earth inclusions; forming a fixed-length plate blank by the molten steel through a casting machine; cold charging of the plate blank into a furnace, wherein the furnace time is 225min, and the furnace discharging temperature is 1208 ℃; removing phosphorus by using high-pressure water, rolling to 46mm by using a rough rolling and reversible finishing mill, controlling the finishing temperature of finish rolling to be 815 ℃, and controlling the final cooling temperature to be 674 ℃; after the temperature of the steel plate is reduced to room temperature, carrying out off-line heat treatment, wherein the quenching heating temperature is 911 ℃, and the heat preservation time is 17min after the core part of the steel plate reaches the quenching temperature; the tempering temperature is 641 ℃, and the temperature of the steel plate is kept for 37min after reaching the tempering temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210488749.XA CN115354127A (en) | 2022-05-06 | 2022-05-06 | Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate |
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| CN202210488749.XA CN115354127A (en) | 2022-05-06 | 2022-05-06 | Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate |
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| CN202210488749.XA Pending CN115354127A (en) | 2022-05-06 | 2022-05-06 | Preparation method of 700 MPa-level rare earth high-strength high-toughness steel plate |
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| CN115896638A (en) * | 2022-12-29 | 2023-04-04 | 包头钢铁（集团）有限责任公司 | Rare earth microalloyed EH47 steel plate with high crack resistance and preparation method thereof |
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| CN115896638A (en) * | 2022-12-29 | 2023-04-04 | 包头钢铁（集团）有限责任公司 | Rare earth microalloyed EH47 steel plate with high crack resistance and preparation method thereof |
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