CN118086651A - High Jiang Tehou steel plate and production method thereof - Google Patents
High Jiang Tehou steel plate and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 154
- 239000010959 steel Substances 0.000 title claims abstract description 154
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 161
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000009749 continuous casting Methods 0.000 claims abstract description 49
- 238000003723 Smelting Methods 0.000 claims abstract description 30
- 239000000126 substance Substances 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000005266 casting Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims description 27
- 238000006477 desulfuration reaction Methods 0.000 claims description 26
- 230000023556 desulfurization Effects 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 25
- 229910001563 bainite Inorganic materials 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 18
- 229910000734 martensite Inorganic materials 0.000 claims description 17
- 229910000859 α-Fe Inorganic materials 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 11
- 238000007872 degassing Methods 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 description 54
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 24
- 239000002893 slag Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 19
- 229910052786 argon Inorganic materials 0.000 description 15
- 238000001514 detection method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 14
- 238000010079 rubber tapping Methods 0.000 description 10
- 229910001566 austenite Inorganic materials 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 238000007664 blowing Methods 0.000 description 7
- 230000009466 transformation Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
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- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 229910001035 Soft ferrite Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
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- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of steelmaking, in particular to a high Jiang Tehou steel plate and a production method thereof. The production method of the high Jiang Tehou steel plate comprises the following steps: 1) Smelting and continuously casting the high-strength extra-thick steel plate according to the chemical composition ratio to obtain a continuous casting blank with the thickness less than or equal to 320 mm, and stacking and cooling the continuous casting blank; 2) Charging the continuous casting billets stacked and cooled in the step 1) into a furnace, heating to 1155-1175 ℃ and preserving heat for 360-400 min; 3) And (3) carrying out high-temperature high-pressure treatment, cooling treatment, straightening treatment, normalizing treatment, primary water cooling and secondary water cooling on the continuous casting blank heated in the furnace in the step (2) at the temperature of 1020-1120 ℃ to obtain the high-strength super-thick steel plate with the thickness of 100-150 mm. The invention uses the continuous casting blank with the thickness less than or equal to 320 mm to produce the high-strength super-thick steel plate with the thickness specification of 100-150 mm and excellent comprehensive performance.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to a high Jiang Tehou steel plate and a production method thereof.
Background
With the rapid development of society, the demand of large-scale structural members such as large-span bridges, super high-rise buildings, high-power wind turbines and the like is increasing. Because of the large volume, complex structure, high load capacity and other reasons of the large structural member, the load bearing capacity of the whole structural member is often improved by adopting high-strength structural steel with large thickness at the key stress position of the large structural member. However, the method is limited by the equipment capacity of the existing production line such as the size of a continuous casting billet, the rolling force of a rolling mill, the cooling uniformity and the like, and the technical problems of unqualified flaw detection, thick core structure, poor low-temperature toughness, large internal stress, buckling of a plate shape and the like easily exist in the process of producing high-strength steel with large thickness. And how to produce high-strength extra-thick (with the thickness of 100-150 mm) steel plates with good comprehensive performance under a low compression ratio by using a conventional thickness continuous casting blank (with the thickness of less than or equal to 320 mm) is a difficult problem to be solved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the existing continuous casting billet with the thickness less than or equal to 320 mm is difficult to produce the Gao Jiangte thick plate with good comprehensive performance under the low compression ratio, so as to provide the high Jiang Tehou steel plate and the production method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the production method of the high Jiang Tehou steel plate comprises the following steps:
1) Smelting and continuously casting the high-strength extra-thick steel plate according to the chemical composition ratio to obtain a continuous casting blank with the thickness less than or equal to 320 mm, and stacking and cooling the continuous casting blank;
2) Charging the continuous casting billets stacked and cooled in the step 1) into a furnace, heating to 1155-1175 ℃ and preserving heat for 360-400 min;
3) Carrying out high-temperature high-pressure treatment, cooling treatment, straightening treatment, normalizing treatment, primary water cooling and secondary water cooling on the continuously cast blank heated in the furnace in the step 2) at the temperature of 1020-1120 ℃ to obtain a high-strength super-thick steel plate with the thickness of 100-150 mm;
The water inlet temperature of the primary water cooling is 880-900 ℃, the cooling speed is 5-10 ℃/s, and the final cooling temperature is 680-720 ℃;
The water inlet temperature of the secondary water cooling is 680-720 ℃, the cooling speed is 18-25 ℃/s, and the final cooling temperature is 300-350 ℃.
Preferably, the smelting comprises: pre-desulfurization treatment, converter smelting, ladle refining and RH vacuum refining;
And/or the thickness of the continuous casting blank is 320 mm;
and/or the compression ratio of the high-strength super-thick steel plate is 2.1-3.2.
Preferably, the RH vacuum refining has a vacuum degree of less than 2 mBar;
And/or, the degassing time in RH vacuum refining is more than or equal to 15 min;
And/or the soft stirring time in the RH vacuum refining is more than or equal to 15 min.
Preferably, the stack is cooled for a period of time greater than or equal to 72 h;
and/or the single-pass pressing amount of the high-temperature large-pressure treatment is 40-45 mm.
Preferably, the cooling speed of the cooling treatment is 8-15 ℃/s;
And/or the final cooling temperature of the cooling treatment is 660-730 ℃;
And/or, the temperature of the straightening treatment is more than or equal to 600 ℃;
And/or, air cooling to room temperature after the straightening treatment.
Preferably, the temperature of the normalizing treatment is Ac3+10 ℃ to Ac3+30 ℃; ac3: when the hypoeutectoid steel is heated, all ferrite is transformed into austenite;
and/or, the heat preservation time of the normalizing treatment is 2.2 min/mm;
And/or, air cooling to room temperature after secondary water cooling.
Preferably, the chemical components of the high-strength super-thick steel plate comprise ：C：0.04~0.06%,Si：0.15~0.2%,Mn：1.75~1.95%,Mo：0.45~0.55%,Nb：0.055~0.065%,Ti：0.015~0.020%,Al：0.03~0.04%,S≤0.003%,P≤0.008%,H≤0.00015%, balance Fe and other unavoidable impurities in percentage by mass.
Preferably, the impurities include N.ltoreq.0.0040% and O.ltoreq.0.0030%.
Preferably, the yield strength of the high-strength super-thick steel plate is more than or equal to 620 MPa;
and/or the tensile strength of the high-strength super-thick steel plate is more than or equal to 740 MPa;
and/or the yield ratio of the high-strength super-thick steel plate is less than or equal to 0.85;
and/or the impact energy of the high-strength super-thick steel plate is minus 60 ℃ KV 2 to be more than or equal to 250J;
And/or the highest position of the internal stress of the high-strength super-thick steel plate is less than 25 MPa;
and/or the unevenness of the high-strength super-thick steel plate is less than 2 mm/m;
and/or, the grain size of the structure in the high-strength super-thick steel plate is less than 10 mu m;
And/or, the high-strength super-thick steel plate comprises 15-25% of ferrite, 35-40% of bainite and 40-45% of martensite in percentage by volume.
The invention discloses a high Jiang Tehou steel plate, which is prepared by the production method of the high-strength super-thick steel plate.
In the present invention, the pre-desulfurization treatment: s is less than or equal to 0.005 percent after molten iron desulfurization, and the temperature is more than or equal to 1300 ℃; and the slag skimming degree after desulfurization is not lower than the B level.
Smelting in a converter: the total loading amount of the converter is 200+ -2 tons, slag is blocked by using a slag blocking plug and a slag blocking rod, the tapping temperature is 1640+ -20 ℃, and the silicomanganese, the medium carbon ferromanganese, the aluminum ingot and the lime are added when tapping is carried out for about 30 tons.
Ladle refining: argon is blown into the bottom of the ladle, the pressure is controlled to be 0.5-0.6 Mpa, and the pressure can be adjusted to be 0.4-0.5 Mpa after tapping 3/4. In the slag making and mixing process, the white slag holding time is more than 15 minutes.
The technical scheme of the invention has the following advantages:
1. The production method of the high Jiang Tehou steel plate comprises the following steps: 1) Smelting and continuously casting the high-strength extra-thick steel plate according to the chemical composition ratio to obtain a continuous casting blank with the thickness less than or equal to 320 mm, and stacking and cooling the continuous casting blank; 2) Charging the continuous casting billets stacked and cooled in the step 1) into a furnace, heating to 1155-1175 ℃ and preserving heat for 360-400 min; 3) Carrying out high-temperature high-pressure treatment, cooling treatment, straightening treatment, normalizing treatment, primary water cooling and secondary water cooling on the continuously cast blank heated in the furnace in the step 2) at the temperature of 1020-1120 ℃ to obtain a high-strength super-thick steel plate with the thickness of 100-150 mm; the water inlet temperature of the primary water cooling is 880-900 ℃, the cooling speed is 5-10 ℃/s, and the final cooling temperature is 680-720 ℃; the water inlet temperature of the secondary water cooling is 680-720 ℃, the cooling speed is 18-25 ℃/s, and the final cooling temperature is 300-350 ℃. According to the invention, stacking cooling is carried out on the continuous casting blank with the conventional thickness, so that the blank is fully expanded with H, the content of H element in the blank is reduced, and the flaw detection quality and low-temperature toughness of the super-thick steel plate are improved; then preserving heat at 1155-1175 ℃ for a long time, and improving the temperature uniformity of the blank, wherein the temperature is too high to cause abnormal growth of an austenite structure, and alloy elements cannot be fully dissolved in solution due to the too low temperature, so that the heating temperature is controlled to 1155-1175 ℃; then high-temperature high-pressure treatment is carried out, the defects of deformation and permeation of the steel plate, holes and cracks of the rolling center are increased, the flaw detection qualification rate of the steel plate is improved, compared with rolling in a low-temperature area, rolling force of a rolling mill can be reduced by rolling in the high-temperature area, rolling difficulty is reduced, meanwhile, the structure of the steel plate center is thinned, and the performance of the steel plate center is improved; and then, carrying out normalizing treatment on the steel plate twice, and carrying out water inlet treatment to obtain a stable ferrite+harder bainite and martensite complex phase structure, so that the steel plate has good welding performance and low-temperature toughness. The water is cooled for the first time after normalizing treatment, the water inlet temperature is 880-900 ℃, the cooling speed is 5-10 ℃/s, and the final cooling temperature is 680-720 ℃; a partially relatively soft ferrite structure can be obtained; the water inlet temperature of the secondary water cooling is 680-720 ℃, the cooling speed is 18-25 ℃/s, the final cooling temperature is 300-350 ℃, a harder bainite/martensite structure can be obtained, higher tensile strength is provided for the steel plate, a complex phase structure can provide a relatively lower yield ratio for the steel plate, and the use safety of the steel structure is improved. In summary, the invention uses the continuous casting blank with the thickness less than or equal to 320 mm, and the technology produces the high-quality steel plate with the thickness specification of 100-150 mm, the yield strength more than or equal to 620 MPa, the tensile strength more than or equal to 740MPa, the yield ratio less than or equal to 0.85, the impact power of-60 ℃ KV 2 more than or equal to 250J, the internal quality of the steel plate is good, the internal stress at different positions is more uniform, the highest position of the internal stress is less than 25MPa, the steel plate irregularity is less than 2mm/m, the steel plate structure is ferrite (volume percentage content is 15-25%) and bainite (volume percentage content is 35-40%) and martensite (volume percentage content is 40-45%) complex phase structure with the grain size less than 10 mu m, the flaw detection grade meets the GB/T2970-2006I grade requirement, and the comprehensive performance is excellent.
2. In the production method of the high-strength super-thick steel plate, in the RH vacuum refining process, the full degassing time and the soft stirring time can improve the purity of the steel plate and the comprehensive mechanical property of the steel plate; after rolling, cooling to 660-730 ℃ at a speed of 8-15 ℃/s, so that the steel plate is rapidly cooled to a ferrite transformation area, further growth of an austenite structure after recrystallization can be avoided, meanwhile, the structure is further refined through transformation, more large-angle grain boundaries are generated, and more nucleation points are provided for subsequent normalizing treatment.
3. In the production method of the high-strength super-thick steel plate, the straightening temperature is more than or equal to 600 ℃, the straightening temperature is relatively high, the straightening difficulty of the super-thick plate is reduced, the internal stress of the steel plate is reduced, the unevenness of the steel plate is reduced, and the assembly precision of the steel plate is improved; the normalizing treatment heating process adopts the heating at the temperature above the austenitizing temperature, and the low-temperature heating and the long-time heat preservation can lead the steel plate structure to be completely austenitized, and simultaneously avoid the growth of the austenitic structure. In addition, normalizing treatment is also a process of refining and homogenizing the structure of the rolled steel plate.
4. In the production method of the high-strength super-thick steel plate, the high-strength super-thick steel plate adopts the component design of low C, high Mn, mo, nb and can refine the steel plate structure by inhibiting the growth of austenite grains;
the optimization mechanism of each chemical component of the high-strength super-thick steel plate is as follows:
C: although the C element can effectively improve the strength of the steel plate, the C element is unfavorable for low-temperature toughness and welding performance, so that the content of the C element is controlled to be 0.04-0.06%.
Si: the Si element is a solid solution strengthening element, so that the corrosion resistance of the steel plate can be improved, but the surface quality and the welding performance of the steel plate are not good due to the fact that the Si content is too high, and therefore the Si content is controlled to be 0.15-0.20%.
Mn: mn element is a solid solution strengthening element, the strengthening effect is only inferior to that of carbon element, mn element is added into low carbon steel to compensate the strength loss of low C, in addition, mn can also improve the hardenability of steel by reducing the transformation temperature and transformation rate of bainite and martensite, so the Mn content is controlled to be 1.75-1.95%.
Nb, ti: in the high-temperature heating process of the blank, most or all of Nb and Ti carbo-nitrides are dissolved in an austenite matrix, and according to the solid solution atom drag theory, nb and Ti solid solution atoms tend to be biased to the austenite grain boundary, and drag the bow and migration of the grain boundary, so that the growth of austenite grains in the heating process is also inhibited. Nb and Ti carbo-nitrides precipitated in the rolling stage also have the effects of inhibiting austenite recrystallization and grain growth after recrystallization, so that the Nb content is controlled to be 0.055-0.065%, but the Ti content is too high, large-size inclusions are easily formed, and the low-temperature impact toughness is not good, so that the Ti content is controlled to be 0.015-0.020%.
Mo: the Mo element is a strong carbide forming element and has the strongest capability of inhibiting the transformation from austenite to pearlite, so that the hardenability of the steel is improved, the Mo element can enable a steel plate with a larger section to be deep and complete, the Mo element is one of important alloying elements of the bainite high-strength steel, and the content of the Mo element is more than 0.40 percent, so that the corrosion resistance of the steel plate can be improved. Therefore, the Mo content is controlled to be 0.45-0.55%.
P, S, H: p, S, H is a harmful element of the steel plate, has great influence on flaw detection quality and low-temperature toughness of the steel plate, and is controlled to be less than or equal to 0.003 percent by a steelmaking process and blank stacking cooling, less than or equal to 0.008 percent by P and less than or equal to 0.00015 percent by H.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
Example 1
The embodiment provides a high-strength extra-thick steel plate with the thickness of 100 mm, wherein the high-strength extra-thick steel plate comprises the following chemical components in percentage by mass: c:0.045%, si:0.17%, mn:1.82%, mo:0.49%, nb:0.059%, ti:0.017%, al:0.032%, S:0.003%, P:0.007%, H:0.00012%, the balance being Fe and other unavoidable impurities; the impurity includes N:0.0032%, O:0.0026%.
The production method of the high-strength super-thick steel plate with the thickness of 100 mm comprises the following steps:
1) Smelting and continuously casting the high-strength super-thick steel plate to obtain a continuous casting blank with the thickness of 320 mm, and stacking and cooling the continuous casting blank for 75: 75 h; wherein, the smelting step comprises pre-desulfurization treatment (S: 0.0040% after molten iron desulfurization, temperature: 1350 ℃ and slag removal degree A level after desulfurization), converter smelting (total loading of the converter is 201 tons, tapping temperature is 1635 ℃), ladle refining (ladle bottom argon blowing, argon pressure is 0.52 Mpa, white slag time is 17 min), RH vacuum refining (degassing time is 17 min under vacuum degree 1.9 mBar, soft stirring time is 16 min);
2) Sequentially carrying out furnace charging heating, high-temperature high-pressure rolling, cooling treatment, straightening treatment and air cooling on the continuous casting billets stacked and cooled in the step 1) to room temperature; the method comprises the following steps: charging the continuous casting billets stacked and cooled in the step 1) to 1165 ℃ and preserving heat 380 min, and then adopting high-temperature large-pressure rolling at 1030-1100 ℃ with single-pass rolling reduction (without the expanding pass) of 40-45 mm; then cooling to 700 ℃ at the speed of 10-12 ℃/s, straightening at 680 ℃, and finally air-cooling to room temperature to obtain a steel plate;
3) Normalizing the steel plate obtained after the treatment in the step 2), performing primary water cooling and secondary water cooling to obtain a high-strength super-thick steel plate with the thickness of 100 mm; wherein the temperature of the normalizing treatment is 895 ℃, and the heat preservation time is 220 min; the water inlet temperature of primary water cooling is 890 ℃, the cooling speed is 6-8 ℃/s, and the final cooling temperature is 710 ℃; the water inlet temperature of the secondary water cooling is 708 ℃, the cooling speed is 21-23 ℃/s, the final cooling temperature is 330 ℃, and then the air cooling is carried out to the room temperature. The structure of the high Jiang Tehou steel plate manufactured in this example is ferrite + bainite + martensite complex phase structure with grain size less than 10 mu m, the content of ferrite in the high-strength super-thick steel plate is 18%, the content of bainite is 38%, the content of martensite is 44% in terms of volume percentage, the normalizing treatment cooling process in this example is shown in table 1, and the mechanical properties, flaw detection grade and unevenness of the manufactured high Jiang Tehou steel plate are shown in table 2.
Example 2
The embodiment provides a high-strength extra-thick steel plate with the thickness of 120 mm, wherein the high-strength extra-thick steel plate comprises the following chemical components in percentage by mass: c:0.048%, si:0.18%, mn:1.85%, mo:0.48%, nb:0.057%, ti:0.016%, al:0.033%, S:0.002%, P:0.006%, H:0.00011%, the balance being Fe and other unavoidable impurities; the impurity includes N:0.0036%, O:0.0027%.
The production method of the high-strength super-thick steel plate with the thickness of 120 mm comprises the following steps:
1) Smelting and continuously casting the high-strength super-thick steel plate to obtain a continuous casting blank with the thickness of 320 mm by adopting the chemical component proportion, and stacking and cooling 73: 73 h the continuous casting blank; wherein, the smelting step comprises pre-desulfurization treatment (S: 0.0045% after molten iron desulfurization, temperature: 1360 ℃ C.; slag skimming degree A grade after desulfurization), converter smelting (total loading of the converter is 200 tons, tapping temperature is 1642 ℃), ladle refining (ladle bottom argon blowing, argon pressure is 0.55 Mpa, white slag time is 16 min), RH vacuum refining (degassing time is 18 min under the condition of vacuum degree of 1.8 mBar, soft stirring time is 17 min);
2) Sequentially carrying out furnace charging heating, high-temperature high-pressure rolling, cooling treatment, straightening treatment and air cooling on the continuous casting billets stacked and cooled in the step 1) to room temperature; the method comprises the following steps: furnace charging and heating the continuous casting billets after stacking and cooling in the step 1) to 1168 ℃, preserving heat 370 min, and then adopting high-temperature large-pressure rolling, wherein the rolling temperature range is 1050-1090 ℃, and the single-pass rolling quantity (without the expanding pass) is 40-45 mm; then cooling to 690 ℃ at the speed of 9-11 ℃/s, straightening at 675 ℃, and finally air-cooling to room temperature to obtain a steel plate;
3) Normalizing the steel plate obtained after the treatment in the step 2), performing primary water cooling and secondary water cooling to obtain a high-strength super-thick steel plate with the thickness of 120 mm; wherein the temperature of the normalizing treatment is 890 ℃, and the heat preservation time is 264 min; the water inlet temperature of primary water cooling is 887 ℃, the cooling speed is 6-7 ℃/s, and the final cooling temperature is 705 ℃; the water inlet temperature of the secondary water cooling is 700 ℃, the cooling speed is 20-22 ℃/s, the final cooling temperature is 320 ℃, and then the air cooling is carried out to the room temperature. The structure of the high Jiang Tehou steel plate manufactured in this example is ferrite + bainite + martensite complex phase structure with grain size less than 10 mu m, the content of ferrite in the high-strength super-thick steel plate is 20%, the content of bainite is 39%, the content of martensite is 41% in terms of volume percentage, the normalizing treatment cooling process in this example is shown in table 1, and the mechanical properties, flaw detection grade and unevenness of the manufactured high Jiang Tehou steel plate are shown in table 2.
Example 3
The embodiment provides a high-strength extra-thick steel plate with the thickness of 150 mm, wherein the high-strength extra-thick steel plate comprises the following chemical components in percentage by mass: c:0.055%, si:0.16%, mn:1.90%, mo:0.51%, nb:0.061%, ti:0.017%, al:0.035%, S:0.002%, P:0.007%, H:0.00010%, the balance being Fe and other unavoidable impurities; the impurity includes N:0.0034%, O:0.0028%.
The production method of the high-strength super-thick steel plate with the thickness of 150 mm comprises the following steps:
1) Smelting and continuously casting the high-strength super-thick steel plate to obtain a continuous casting blank with the thickness of 320 mm by adopting the chemical component proportion, and stacking and cooling 78 to h the continuous casting blank; wherein, the smelting step comprises pre-desulfurization treatment (S: 0.0042% after molten iron desulfurization, temperature: 1360 ℃ C.; slag skimming degree A grade after desulfurization), converter smelting (total loading of the converter is 199 tons, tapping temperature is 1650 ℃), ladle refining (ladle bottom argon blowing, argon pressure is 0.53 Mpa, white slag time is 17 min), RH vacuum refining (degassing time is 17 min under the condition of vacuum degree of 1.8 mBar, soft stirring time is 17 min);
2) Sequentially carrying out furnace charging heating, high-temperature high-pressure rolling, cooling treatment, straightening treatment and air cooling on the continuous casting billets stacked and cooled in the step 1) to room temperature; the method comprises the following steps: charging the continuous casting billets stacked and cooled in the step 1) to 1170 ℃ and preserving heat 385 min, and then adopting high-temperature large-pressure rolling, wherein the rolling temperature range is 1040-1100 ℃, and the single-pass rolling quantity (without the expanding pass) is 40-45 mm; then cooling to 680 ℃ at the speed of 10-12 ℃/s, straightening at 665 ℃, and finally air-cooling to room temperature to obtain a steel plate;
3) Normalizing the steel plate obtained after the treatment in the step 2), performing primary water cooling and secondary water cooling to obtain a high-strength super-thick steel plate with the thickness of 150 mm; wherein the temperature of the normalizing treatment is 900 ℃, and the heat preservation time is 330 min; the water inlet temperature of primary water cooling is 892 ℃, the cooling speed is 7-9 ℃/s, and the final cooling temperature is 710 ℃; the water inlet temperature of the secondary water cooling is 706 ℃, the cooling speed is 21-23 ℃/s, the final cooling temperature is 335 ℃, and then the air cooling is carried out to the room temperature. The structure of the high Jiang Tehou steel plate manufactured in this example is ferrite + bainite + martensite complex phase structure with grain size less than 10 mu m, the content of ferrite in the high-strength super-thick steel plate is 22%, the content of bainite is 37%, the content of martensite is 41% in terms of volume percentage, the normalizing treatment cooling process in this example is shown in table 1, and the mechanical properties, flaw detection grade and unevenness of the manufactured high Jiang Tehou steel plate are shown in table 2.
Comparative example 1
The comparative example provides a high-strength ultra-thick steel plate with a thickness of 150 mm, wherein the high-strength ultra-thick steel plate comprises the following chemical components in percentage by mass: c:0.055%, si:0.16%, mn:1.90%, mo:0.51%, nb:0.061%, ti:0.017%, al:0.035%, S:0.002%, P:0.007%, H:0.00010%, the balance being Fe and other unavoidable impurities; the impurity includes N:0.0034%, O:0.0028%.
The production method of the high-strength super-thick steel plate with the thickness of 150 mm comprises the following steps:
1) Smelting and continuously casting the high-strength super-thick steel plate to obtain a continuous casting blank with the thickness of 320 mm by adopting the chemical component proportion, and stacking and cooling 78 to h the continuous casting blank; wherein, the smelting step comprises pre-desulfurization treatment (S: 0.0042% after molten iron desulfurization, temperature: 1360 ℃ C.; slag skimming degree A grade after desulfurization), converter smelting (total loading of the converter is 199 tons, tapping temperature is 1650 ℃), ladle refining (ladle bottom argon blowing, argon pressure is 0.53 Mpa, white slag time is 17 min), RH vacuum refining (degassing time is 17 min under the condition of vacuum degree of 1.8 mBar, soft stirring time is 17 min);
2) Sequentially carrying out furnace charging heating, high-temperature high-pressure rolling, cooling treatment, straightening treatment and air cooling on the continuous casting billets stacked and cooled in the step 1) to room temperature; the method comprises the following steps: charging the continuous casting billets stacked and cooled in the step 1) to 1170 ℃ and preserving heat 385 min, and then adopting high-temperature large-pressure rolling, wherein the rolling temperature range is 1040-1100 ℃, and the single-pass rolling quantity (without the expanding pass) is 40-45 mm; then cooling to 680 ℃ at the speed of 10-12 ℃/s, straightening at 665 ℃, and finally air-cooling to room temperature to obtain a steel plate;
3) Normalizing the steel plate obtained after the treatment in the step 2), and performing primary water cooling to obtain a high-strength super-thick steel plate with the thickness of 150 mm; wherein the temperature of the normalizing treatment is 900 ℃, and the heat preservation time is 330 min; and (3) water cooling after the normalizing treatment furnace is performed by primary water cooling, wherein the water inlet temperature of the primary water cooling is 892 ℃, the cooling speed is 12-20 ℃/s, the final cooling temperature is 335 ℃, and then the primary water cooling is performed by air cooling to room temperature. The structure of the high Jiang Tehou steel plate prepared in the comparative example is a bainite+martensite structure, and the maximum size of crystal grains is about 15 mu m. The normalizing cooling process in this comparative example is shown in Table 1, and the mechanical properties, flaw detection grade and unevenness of the produced high Jiang Tehou steel sheet are shown in Table 2.
Comparative example 2
The comparative example provides a high-strength ultra-thick steel plate with a thickness of 150 mm, wherein the high-strength ultra-thick steel plate comprises the following chemical components in percentage by mass: c:0.055%, si:0.16%, mn:1.90%, mo:0.51%, nb:0.061%, ti:0.017%, al:0.035%, S:0.002%, P:0.007%, H:0.00010%, the balance being Fe and other unavoidable impurities; the impurity includes N:0.0034%, O:0.0028%.
The production method of the high-strength super-thick steel plate with the thickness of 150 mm comprises the following steps:
1) Smelting and continuously casting the high-strength super-thick steel plate to obtain a continuous casting blank with the thickness of 320 mm by adopting the chemical component proportion, and stacking and cooling 78 to h the continuous casting blank; wherein, the smelting step comprises pre-desulfurization treatment (S: 0.0042% after molten iron desulfurization, temperature: 1360 ℃ C.; slag skimming degree A grade after desulfurization), converter smelting (total loading of the converter is 199 tons, tapping temperature is 1650 ℃), ladle refining (ladle bottom argon blowing, argon pressure is 0.53 Mpa, white slag time is 17 min), RH vacuum refining (degassing time is 17 min under the condition of vacuum degree of 1.8 mBar, soft stirring time is 17 min);
2) Sequentially carrying out furnace charging heating, two-stage rolling (rough rolling and finish rolling), cooling treatment, straightening treatment and air cooling on the continuous casting billet after stacking cooling in the step 1) to room temperature to obtain a high-strength super-thick steel plate with the thickness of 150 mm; the method comprises the following steps: charging the continuous casting billets after stacking and cooling in the step 1) to 1170 ℃ and preserving heat 385 min, and then adopting two-stage rolling and rough rolling, wherein the rolling temperature range is 1040-1100 ℃, and the single-pass rolling reduction (without the expanding pass) is 40-45 mm; cooling to 850 ℃ at a speed of 10-12 ℃/s by adopting an intermediate blank cooling process when the temperature is 195-mm, performing finish rolling, wherein the finish rolling temperature range is 830-850 ℃, then cooling to 335 ℃ at a speed of 13-15 ℃/s, straightening, and then performing air cooling to room temperature to obtain the high-strength super-thick steel plate with the thickness of 150-mm; the structure of the high Jiang Tehou steel plate prepared in the comparative example is a bainite+martensite structure, and the maximum size of crystal grains is about 20 mu m. The mechanical properties, flaw detection levels and unevenness of the high Jiang Tehou steel plates prepared in this comparative example are shown in Table 2.
Comparative example 3
The comparative example provides a high-strength ultra-thick steel plate with a thickness of 150 mm, wherein the high-strength ultra-thick steel plate comprises the following chemical components in percentage by mass: c:0.055%, si:0.16%, mn:1.90%, mo:0.51%, nb:0.061%, ti:0.017%, al:0.035%, S:0.002%, P:0.007%, H:0.00010%, the balance being Fe and other unavoidable impurities; the impurity includes N:0.0034%, O:0.0028%.
The production method of the high-strength super-thick steel plate with the thickness of 150 mm comprises the following steps:
1) Smelting and continuously casting the high-strength super-thick steel plate to obtain a continuous casting blank with the thickness of 320 mm by adopting the chemical component proportion, and stacking and cooling 78 to h the continuous casting blank; wherein, the smelting step comprises pre-desulfurization treatment (S: 0.0042% after molten iron desulfurization, temperature: 1360 ℃ C.; slag skimming degree A grade after desulfurization), converter smelting (total loading of the converter is 199 tons, tapping temperature is 1650 ℃), ladle refining (ladle bottom argon blowing, argon pressure is 0.53 Mpa, white slag time is 17 min), RH vacuum refining (degassing time is 17 min under the condition of vacuum degree of 1.8 mBar, soft stirring time is 17 min);
2) Sequentially carrying out furnace charging heating, two-stage rolling (rough rolling and finish rolling), primary water cooling, secondary water cooling, straightening and air cooling on the continuous casting blanks stacked and cooled in the step 1) to room temperature to obtain a high-strength ultra-thick steel plate of 150 mm; the method comprises the following steps: charging the continuous casting billets after stacking and cooling in the step 1) to 1170 ℃ and preserving heat 385 min, and then adopting two-stage rolling and rough rolling, wherein the rolling temperature range is 1040-1100 ℃, and the single-pass rolling reduction (without the expanding pass) is 40-45 mm; cooling to 850 ℃ at a speed of 10-12 ℃/s by adopting an intermediate blank cooling process when the temperature is 195-mm, performing finish rolling, wherein the finish rolling temperature range is 830-850 ℃, and performing primary water cooling and secondary water cooling after finishing finish rolling; the primary water cooling speed is 6-8 ℃/s, and the final cooling temperature is 730 ℃; the cooling speed of the secondary water cooling is 15 ℃/s, the final cooling temperature is 335 ℃, straightening is carried out, and finally air cooling is carried out to room temperature. The high Jiang Tehou steel plate prepared in the comparative example has a structure of lath bainite plus a small amount of martensite, and the maximum size of crystal grains is about 20 mu m. The mechanical properties, flaw detection levels and unevenness of the high Jiang Tehou steel plates prepared in this comparative example are shown in Table 2.
Comparative example 4
The comparative example provides a high-strength ultra-thick steel plate with a thickness of 150 mm, wherein the high-strength ultra-thick steel plate comprises the following chemical components in percentage by mass: c:0.055%, si:0.16%, mn:1.90%, mo:0.51%, nb:0.061%, ti:0.017%, al:0.035%, S:0.002%, P:0.007%, H:0.00010%, the balance being Fe and other unavoidable impurities; the impurity includes N:0.0034%, O:0.0028%.
The production method of the high-strength super-thick steel plate with the thickness of 150 mm comprises the following steps:
1) Smelting and continuously casting the high-strength super-thick steel plate to obtain a continuous casting blank with the thickness of 320 mm by adopting the chemical component proportion, and stacking and cooling 78 to h the continuous casting blank; wherein, the smelting step comprises pre-desulfurization treatment (S: 0.0042% after molten iron desulfurization, temperature: 1360 ℃ C.; slag skimming degree A grade after desulfurization), converter smelting (total loading of the converter is 199 tons, tapping temperature is 1650 ℃), ladle refining (ladle bottom argon blowing, argon pressure is 0.53 Mpa, white slag time is 17 min), RH vacuum refining (degassing time is 17 min under the condition of vacuum degree of 1.8 mBar, soft stirring time is 17 min);
2) Sequentially carrying out furnace charging heating, two-stage rolling (rough rolling and finish rolling), cooling treatment, straightening treatment and air cooling on the continuous casting billets stacked and cooled in the step 1) to room temperature; the method comprises the following steps: charging the continuous casting billets after stacking and cooling in the step 1) to 1170 ℃ and preserving heat 385 min, and then adopting two-stage rolling and rough rolling, wherein the rolling temperature range is 1040-1100 ℃, and the single-pass rolling reduction (without the expanding pass) is 40-45 mm; cooling to 850 ℃ at a speed of 10-12 ℃/s by adopting an intermediate blank cooling process when the temperature is 195-mm, performing finish rolling, wherein the finish rolling temperature interval is 830-850 ℃, then cooling to 680 ℃ at a speed of 10-12 ℃/s, straightening at 665 ℃, and performing air cooling to room temperature to obtain a steel plate;
3) Normalizing the steel plate obtained after the treatment in the step 2), performing primary water cooling and secondary water cooling to obtain a high-strength super-thick steel plate with the thickness of 150 mm; wherein the temperature of the normalizing treatment is 900 ℃, and the heat preservation time is 330 min; the water inlet temperature of primary water cooling is 892 ℃, the cooling speed is 7-9 ℃/s, and the final cooling temperature is 710 ℃; the water inlet temperature of the secondary water cooling is 706 ℃, the cooling speed is 21-23 ℃/s, the final cooling temperature is 335 ℃, and then the air cooling is carried out to the room temperature. The structure of the high Jiang Tehou steel plate prepared in the comparative example is a ferrite, bainite and martensite complex phase structure, and the maximum size of crystal grains is about 15 mu m. The high strength ultra-thick steel plate has the advantages that the ferrite content is 23%, the bainite content is 42%, the martensite content is 35% in the high strength ultra-thick steel plate, the normalizing cooling process in the comparative example is shown in table 1, and the mechanical properties, flaw detection grade and unevenness of the prepared high Jiang Tehou steel plate are shown in table 2.
Table 1 normalizing cooling process in examples 1-3, comparative example 1, comparative example 4;
table 2 the test results of the properties of the steel sheets of examples 1 to 3 and comparative examples 1 to 4;
As can be seen from Table 2, by adopting the technology of the invention to carry out composition and process design, gao Jiangte thick plates with excellent performance are produced, the steel plate not only has higher strength, but also has good low-temperature toughness and smaller internal stress, the flaw detection performance of the steel plate can meet the GB/T2970-2006I level requirement, and in addition, the steel plate also has good anti-seismic performance and plate shape quality; the flaw detection performance of the super-thick plate produced by adopting a two-stage rolling process without adopting a high-temperature large-pressure rolling process can only meet the GB/T2970-2006 III level requirement, and the center low-temperature toughness is poor; the ultra-thick plate obtained by adopting a one-time water cooling method without normalizing treatment or normalizing treatment has the advantages of thicker steel plate structure, poorer low-temperature toughness of the core part, higher yield ratio, larger internal stress and poorer steel plate precision.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. The production method of the high Jiang Tehou steel plate is characterized by comprising the following steps of:
1) Smelting and continuously casting the high-strength extra-thick steel plate according to the chemical composition ratio to obtain a continuous casting blank with the thickness less than or equal to 320 mm, and stacking and cooling the continuous casting blank;
2) Charging the continuous casting billets stacked and cooled in the step 1) into a furnace, heating to 1155-1175 ℃ and preserving heat for 360-400 min;
3) Carrying out high-temperature high-pressure treatment, cooling treatment, straightening treatment, normalizing treatment, primary water cooling and secondary water cooling on the continuously cast blank heated in the furnace in the step 2) at the temperature of 1020-1120 ℃ to obtain a high-strength super-thick steel plate with the thickness of 100-150 mm;
The water inlet temperature of the primary water cooling is 880-900 ℃, the cooling speed is 5-10 ℃/s, and the final cooling temperature is 680-720 ℃;
The water inlet temperature of the secondary water cooling is 680-720 ℃, the cooling speed is 18-25 ℃/s, and the final cooling temperature is 300-350 ℃.
2. The method of claim 1, wherein the smelting comprises: pre-desulfurization treatment, converter smelting, ladle refining and RH vacuum refining;
And/or the thickness of the continuous casting blank is 320 mm;
and/or the compression ratio of the high-strength super-thick steel plate is 2.1-3.2.
3. The production method according to claim 2, wherein the degree of vacuum in the RH vacuum refining is < 2 mBar;
And/or, the degassing time in RH vacuum refining is more than or equal to 15 min;
And/or the soft stirring time in the RH vacuum refining is more than or equal to 15 min.
4. The method of claim 1 or 2, wherein the stack is cooled for a period of time greater than or equal to 72 h;
and/or the single-pass pressing amount of the high-temperature large-pressure treatment is 40-45 mm.
5. The production method according to claim 1 or 2, characterized in that the cooling rate of the cooling treatment is 8-15 ℃/s;
And/or the final cooling temperature of the cooling treatment is 660-730 ℃;
And/or, the temperature of the straightening treatment is more than or equal to 600 ℃;
And/or, air cooling to room temperature after the straightening treatment.
6. The production method according to claim 1 or 2, wherein the normalizing treatment temperature is Ac3+10 ℃ to Ac3+30 ℃;
and/or, the heat preservation time of the normalizing treatment is 2.2 min/mm;
And/or, air cooling to room temperature after secondary water cooling.
7. The production method according to claim 1 or 2, wherein the chemical components of the high-strength extra-thick steel plate include ：C：0.04~0.06%,Si：0.15~0.2%,Mn：1.75~1.95%,Mo：0.45~0.55%,Nb：0.055~0.065%,Ti：0.015~0.020%,Al：0.03~0.04%,S≤0.003%,P≤0.008%,H≤0.00015%, and the balance of Fe and other unavoidable impurities in mass percent.
8. The method of claim 7, wherein the impurities include N0.0040% or less and O0.0030% or less.
9. The production method according to claim 1 or 2, wherein the yield strength of the high-strength extra-thick steel plate is not less than 620 MPa;
and/or the tensile strength of the high-strength super-thick steel plate is more than or equal to 740 MPa;
and/or the yield ratio of the high-strength super-thick steel plate is less than or equal to 0.85;
and/or the impact energy of the high-strength super-thick steel plate is minus 60 ℃ KV 2 to be more than or equal to 250J;
And/or the highest position of the internal stress of the high-strength super-thick steel plate is less than 25 MPa;
and/or the unevenness of the high-strength super-thick steel plate is less than 2 mm/m;
and/or, the grain size of the structure in the high-strength super-thick steel plate is less than 10 mu m;
And/or, the high-strength super-thick steel plate comprises 15-25% of ferrite, 35-40% of bainite and 40-45% of martensite in percentage by volume.
10. A high Jiang Tehou steel sheet, characterized in that it is produced by the method for producing a high-strength extra-thick steel sheet according to any one of claims 1 to 9.
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