CN111621713A - Normalized rolled S460N thick steel plate and production method thereof - Google Patents
Normalized rolled S460N thick steel plate and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a normalized rolled S460N thick steel plate and a production method thereof, relating to the technical field of steel smelting, and comprising the following chemical components in percentage by mass: c: 0.16-0.18%, Mn: 1.50% -1.70%, Si: 0.20-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.030-0.050%, V: 0.050% -0.070%, Alt: 0.020-0.050%, CEV less than or equal to 0.48%, and the balance of Fe and inevitable impurities. The high-strength low-temperature toughness thick steel plate S460N with the maximum thickness of 80mm is developed by adopting the design of 0.16-0.18 percent of carbon content and without adding Ni noble alloy elements and adopting the normalizing rolling process without normalizing or quenching and tempering heat treatment procedures, and the performance completely meets the EN10025-3 standard requirement.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a normalized rolled S460N thick steel plate and a production method thereof.
Background
The S460N steel plate is the highest strength grade product in EN10025-3 standard products, requires normalizing or normalizing rolling delivery, and is mainly applied to key structural parts of large bridges, large-span buildings, wind power, hydropower, ocean engineering and the like. The steel plate is required to have high strength grade, and has strict requirements on low-temperature impact performance, lamellar tearing resistance, internal quality, welding performance and the like. The larger the thickness of the steel plate is, the larger rolling compression ratio is required to improve the quality problems of internal segregation, looseness and the like, the low phosphorus and low sulfur content is controlled during smelting, and the cleanliness of molten steel is improved to ensure that the steel plate has excellent low-temperature impact performance of 50 ℃ below zero.
With the rapid development of world economy, more and more engineering projects are carried out in polar regions, severe cold regions, oceans and other regions, and the demand for high-strength and low-temperature toughness steel plates is increasing day by day. The prior patent application related to the S460N product generally adopts normalizing or quenching and tempering processes for production in order to ensure the strength and the low-temperature impact property of the S460N steel plate, particularly the normalizing process needs to add more alloy elements, and in addition, the CEV is higher, so that the welding property is not favorable.
The method is characterized in that the application number of 201710401182.7, namely the normalized high-strength S460N thick steel plate produced by a continuous casting billet and the production method thereof, is used for producing a 100-150 mm S460N extra-thick steel plate, normalizing heat treatment is required, and the normalized steel plate needs to be controlled to be cooled to 620-680 ℃ by water; in addition, the carbon content is designed to be as high as 0.16-0.19%, the alloy content is high, for example, the adding amount of the noble alloy V is as high as 0.06-0.08%, the CEV is less than or equal to 0.50%, the production procedures are multiple, the cost is high, and the high CEV is unfavorable for welding.
The application number of 201811096316.X discloses a quenched and tempered large-thickness low-alloy high-strength steel plate for hydropower and a production method thereof, wherein a 200-260 mm S460N extra-thick plate is produced, the composition design contains 0.40-0.80% of Ni alloy elements, the rolled steel plate is rolled after die casting, quenching and tempering heat treatment needs to be carried out on the rolled steel plate, and the quenched and tempered large-thickness low-alloy high-strength steel plate has the advantages of multiple production procedures, long flow and high cost.
In summary, the conventional S460N steel plate is generally produced by normalizing or quenching and tempering heat treatment processes to ensure the high strength and low temperature impact properties of the steel plate, and particularly, the normalizing process ensures a 460MPa high strength level after normalizing, and more alloy elements are added under the condition of higher carbon content, so that the steel grade has a relatively high CEV, more production processes and high cost, and the high CEV is unfavorable for welding. Therefore, it is urgently required to develop an S460N steel sheet having a simple production process, a low production cost, and excellent weldability.
Disclosure of Invention
In order to solve the technical problems, the invention provides a normalized rolled S460N thick steel plate, which comprises the following chemical components in percentage by mass: c: 0.16-0.18%, Mn: 1.50% -1.70%, Si: 0.20-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.030-0.050%, V: 0.050% -0.070%, Alt: 0.020-0.050%, CEV less than or equal to 0.48%, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the normalized rolled steel plate S460N is the steel plate with the maximum thickness of 80 mm.
The normalized and rolled S460N steel plate comprises the following chemical components in percentage by mass: c: 0.164 to 0.166%, Mn: 1.59% -1.62%, Si: 0.31-0.36%, P is less than or equal to 0.010%, S is less than or equal to 0.002%, Nb: 0.036% -0.043%, V: 0.063% -0.068%, Alt: 0.033 to 0.037 percent, less than or equal to 0.46 percent of CEV, and the balance of Fe and inevitable impurities.
The normalized and rolled S460N steel plate comprises the following chemical components in percentage by mass: c: 0.173 to 0.174%, Mn: 1.61% -1.65%, Si: 0.28 to 0.35 percent of the total weight of the alloy, less than or equal to 0.012 percent of P, less than or equal to 0.002 percent of S, Nb: 0.031% -0.038%, V: 0.053% -0.058%, Alt: 0.035 to 0.039 percent, less than or equal to 0.47 percent of CEV, and the balance of Fe and inevitable impurities.
The invention also aims to provide a production method of the normalized rolling S460N steel plate, which comprises a steel-making process, a blank heating process, a rolling process and a controlled cooling process,
s1, a steel-making process: the method comprises the steps of adopting converter deep dephosphorization molten steel P less than or equal to 0.015 percent, molten steel pretreatment dehydration and LF deep desulfurization molten steel S less than or equal to 0.005 percent, and preparing a casting blank of 260-320 mm by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.0-14.0 min/cm, and the heating temperature is 1150-1180 ℃; s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is more than or equal to 980 ℃, and the total reduction rate of the rough rolling is more than 60%; in the second stage, the thickness of the intermediate blank is controlled to be 20-30 mm of the thickness of the product, the intermediate blank is cooled to 850-860 ℃ through water and then is rolled, and the final rolling temperature is 840-860 ℃;
s4, a cooling process: and cooling the rolled steel plate to 550-600 ℃ in air, and then taking the steel plate off line for stacking and slow cooling for more than 72 hours.
The production method of the normalized rolled S460N steel plate comprises the following steps of S1: the converter deep dephosphorization molten steel P is less than or equal to 0.010 percent, the molten steel pretreatment desulphurization and LF deep desulfurization molten steel S is less than or equal to 0.002 percent, and a casting blank with the thickness of 320mm is prepared by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.3-10.7 min/cm, and the heating temperature is 1168-1171 ℃;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the first-stage rough rolling is more than or equal to 1002 ℃, and the total reduction rate of the rough rolling is more than 65%; in the second stage, the thickness of the intermediate billet is controlled to be 110mm, the intermediate billet is cooled to 851-854 ℃ through water and then starts to be rolled, and the final rolling temperature is 846-851 ℃;
s4, a cooling process: and cooling the rolled steel plate to 566-579 ℃ in air, and then taking the steel plate off line for stacking and slow cooling for more than 72 hours.
The production method of the normalized rolled S460N steel plate comprises the following steps of S1: the converter deep dephosphorization molten steel P is less than or equal to 0.012 percent, the molten steel pretreatment dehydration and LF deep desulfurization molten steel S is less than or equal to 0.002 percent, and a casting blank with the thickness of 260-320 mm is prepared by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.5-11.2 min/cm, and the heating temperature is 1152-1161 ℃;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is more than or equal to 993 ℃, and the total reduction rate of the rough rolling is more than 67%; in the second stage, the thickness of the intermediate blank is controlled to be 85-90 mm, the intermediate blank is cooled to 855-858 ℃ through water and is rolled, and the finish rolling temperature is 853-855 ℃;
s4, a cooling process: and cooling the rolled steel plate to 558-581 ℃ in air, and then performing stacking and slow cooling for more than 72 hours while taking the steel plate out of line.
The invention has the beneficial effects that: the high-strength low-temperature toughness thick steel plate with the maximum thickness of 80mm is developed by adopting the design of 0.16-0.18 percent of carbon content and without adding Ni noble alloy elements through a normalizing rolling process without normalizing or quenching and tempering heat treatment procedures, the performance completely meets the EN10025-3 standard requirement, particularly the low-temperature impact energy of the steel plate at the temperature of-20 ℃ is more than or equal to 100J, and the Z-direction performance in the thickness direction is more than or equal to 50 percent. Solid solution strengthening with higher Mn and Si contents is adopted, and a certain content of Nb and V microalloy elements are added, so that the strength of the steel plate is improved through precipitation strengthening of Nb (CN) and V (CN); and optimizing the normalizing rolling process, namely adopting measures of reducing the thickness of the intermediate blank, cooling the intermediate blank with water and then carrying out differential temperature controlled rolling and the like to realize the matching of the high strength and the low temperature toughness of the steel plate. Because the steel plate has low alloy content, additional normalizing or quenching and tempering heat treatment is not needed, the production cost is low, the production process is simple, and the economic and efficient production of the steel plate can be realized.
Detailed Description
Example 1
The normalized and rolled S460N steel plate provided by the embodiment has a thickness of 80mm, and comprises the following chemical components in percentage by mass: c: 0.166%, Mn: 1.59%, Si: 0.31%, P: 0.008%, S: 0.002%, Nb: 0.043%, V: 0.063%, Alt: 0.037%, CEV: 0.46%, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps:
s1, a steel-making process: deep dephosphorization of molten steel P by adopting a converter: 0.008%, molten iron pretreatment and LF deep desulfurization molten steel S: 0.001 percent, and preparing a casting blank with the thickness of 320mm by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.3min/cm, the heating temperature is 1171 ℃, and the solid solution of Nb element and the heating uniformity of the casting blank are ensured;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is 1008 ℃, and the total reduction rate of the rough rolling is 65%; in the second stage, the thickness of the intermediate billet is controlled to be 110mm, the intermediate billet is cooled to 851 ℃ through water and then is rolled, and the finishing temperature is 846 ℃;
s4, a cooling process: the rolled steel plate is cooled to 579 ℃ in air, and then is off-line for stacking and slow cooling for more than 72 hours.
The mechanical properties of the steel plate are as follows: 443MPa of yield strength, 607MPa of tensile strength, 24.5% of elongation after fracture, Akv of impact energy at-20 ℃: 137J, 168J and 173J, and 54%, 56% and 57% of Z-direction performance in the thickness direction.
Example 2
The normalized and rolled S460N steel plate provided by the embodiment has a thickness of 80mm, and comprises the following chemical components in percentage by mass: c: 0.164%, Mn: 1.62%, Si: 0.36%, P: 0.010%, S: 0.001%, Nb: 0.036%, V: 0.063% -0.068%, Alt: 0.037%, CEV: 0.46%, and the balance of Fe and inevitable impurities.
The preparation method comprises the following steps:
s1, a steel-making process: deep dephosphorization of molten steel P by adopting a converter: 0.010%, molten iron pretreatment dehydration and LF deep desulfurization molten steel S: 0.001 percent, and preparing a casting blank with the thickness of 320mm by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.7min/cm, the heating temperature is 1168 ℃, and the Nb element solid solution and the casting blank heating uniformity are ensured;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is 1002 ℃, and the total reduction rate of the rough rolling is 65%; in the second stage, the thickness of the intermediate billet is controlled to be 110mm, the intermediate billet is cooled to 854 ℃ through water and begins to be rolled, and the finish rolling temperature is 851 ℃;
s4, a cooling process: the rolled steel plate is cooled to 566 ℃ in air, and then is subjected to stacking and slow cooling for more than 72 hours while being taken off line.
The mechanical properties of the steel plate are as follows: a yield strength of 448MPa, a tensile strength of 616MPa, an elongation after fracture of 21.5%, an impact energy Akv at-20 ℃: 112J, 125J and 132J, and 55%, 57% and 58% of performance in the Z direction of the thickness direction.
Example 3
The normalized and rolled S460N steel plate provided by the embodiment has a thickness of 60mm, and comprises the following chemical components in percentage by mass: c: 0.174%, Mn: 1.65%, Si: 0.28%, P: 0.012%, S: 0.002%, Nb: 0.031%, V: 0.053%, Alt: 0.039%, CEV: 0.47 percent.
The preparation method comprises the following steps:
s1, a steel-making process: deep dephosphorization of molten steel P by adopting a converter: 0.012%, molten iron pretreatment and LF deep desulfurization molten steel S: 0.002%, and preparing a casting blank with the thickness of 320mm by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 11.2min/cm, the heating temperature is 1161 ℃, and the Nb element solid solution and the casting blank heating uniformity are ensured;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is 997 ℃, and the total reduction rate of the rough rolling is 71%; in the second stage, the thickness of the intermediate billet is controlled to be 90mm, the intermediate billet is cooled to 858 ℃ by water and is rolled, and the finishing temperature is 855 ℃;
s4, a cooling process: and cooling the rolled steel plate to 558 ℃ in air, and then performing stacking slow cooling for more than 72 hours while taking the steel plate out of the line.
The mechanical properties of the steel plate are as follows: 458MPa of yield strength, 606MPa of tensile strength, 23% of elongation after fracture, Akv of impact energy at-20 ℃: 198J, 191J and 230J, and 61%, 60% and 63% of the performance in the thickness direction Z direction.
Example 4
The normalized and rolled S460N steel plate provided by the embodiment has a thickness of 60mm, and comprises the following chemical components in percentage by mass: c: 0.173%, Mn: 1.61%, Si: 0.35%, P: 0.011%, S: 0.002%, Nb: 0.038%, V: 0.058%, Alt: 0.035%, CEV: 0.46 percent.
The preparation method comprises the following steps:
s1, a steel-making process: 0.011 percent of converter deep dephosphorization molten steel P and 0.002 percent of molten steel S subjected to pretreatment and LF deep desulfurization are adopted, and a casting blank with the thickness of 260mm is prepared by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.5min/cm, the heating temperature is 1152 ℃, and the solid solution of Nb element and the heating uniformity of the casting blank are ensured;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is more than or equal to 993 ℃, and the total reduction rate of the rough rolling is 67 percent; in the second stage, the thickness of the intermediate billet is controlled to be 85mm, the intermediate billet is cooled to 855 ℃ by water and is rolled, and the finish rolling temperature is 853 ℃;
s4, a cooling process: the rolled steel plate is cooled to 581 ℃ in air, and then is subjected to stacking and slow cooling for more than 72 hours in an off-line mode.
The mechanical properties of the steel plate are as follows: yield strength 472MPa, tensile strength 610MPa, elongation after fracture 25.5%, impact energy Akv at-20 ℃: 216J, 229J, 288J, 57%, 55% in the Z-direction of the thickness.
The invention adopts the design of 0.16-0.18% carbon content components, the normalizing rolling process and the like, develops the S460N steel plate with the maximum thickness of 80mm, the steel plate is the brand number S460N, and the quality of the steel plate simultaneously meets the national standard Q460ND, Q460NC, Q460D and Q460C series steel plates. The product quality is excellent, the production cost is properly controlled, the comprehensive cost performance is good, and the estimated gross profit per ton of steel is more than 800 yuan/ton.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A normalized rolled S460N steel plate, comprising: the chemical components and the mass percentage are as follows: c: 0.16-0.18%, Mn: 1.50% -1.70%, Si: 0.20-0.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Nb: 0.030-0.050%, V: 0.050% -0.070%, Alt: 0.020-0.050%, CEV less than or equal to 0.48%, and the balance of Fe and inevitable impurities.
2. A normalized-rolled S460N steel sheet as claimed in claim 1 wherein: the maximum thickness of the steel plate is 80 mm.
3. A normalized-rolled S460N steel sheet as claimed in claim 1 wherein: the chemical components and the mass percentage are as follows: c: 0.164 to 0.166%, Mn: 1.59% -1.62%, Si: 0.31-0.36%, P is less than or equal to 0.010%, S is less than or equal to 0.002%, Nb: 0.036% -0.043%, V: 0.063% -0.068%, Alt: 0.033 to 0.037 percent, less than or equal to 0.46 percent of CEV, and the balance of Fe and inevitable impurities.
4. A normalized-rolled S460N steel sheet as claimed in claim 1 wherein: the chemical components and the mass percentage are as follows: c: 0.173 to 0.174%, Mn: 1.61% -1.65%, Si: 0.28 to 0.35 percent of the total weight of the alloy, less than or equal to 0.012 percent of P, less than or equal to 0.002 percent of S, Nb: 0.031% -0.038%, V: 0.053% -0.058%, Alt: 0.035 to 0.039 percent, less than or equal to 0.47 percent of CEV, and the balance of Fe and inevitable impurities.
5. A method for producing normalized rolled S460N steel plate according to any one of claims 1-4, comprising a steel-making process, a billet heating process, a rolling process, a controlled cooling process, characterized in that:
s1, a steel-making process: the method comprises the steps of adopting converter deep dephosphorization molten steel P less than or equal to 0.015 percent, molten steel pretreatment dehydration and LF deep desulfurization molten steel S less than or equal to 0.005 percent, and preparing a casting blank of 260-320 mm by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.0-14.0 min/cm, and the heating temperature is 1150-1180 ℃;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is more than or equal to 980 ℃, and the total reduction rate of the rough rolling is more than 60%; in the second stage, the thickness of the intermediate blank is controlled to be 20-30 mm of the thickness of the product, the intermediate blank is cooled to 850-860 ℃ through water and then is rolled, and the final rolling temperature is 840-860 ℃;
s4, a cooling process: and cooling the rolled steel plate to 550-600 ℃ in air, and then taking the steel plate off line for stacking and slow cooling for more than 72 hours.
6. A method of producing normalized rolled S460N steel plate according to claim 5, wherein:
s1, a steel-making process: the converter deep dephosphorization molten steel P is less than or equal to 0.010 percent, the molten steel pretreatment desulphurization and LF deep desulfurization molten steel S is less than or equal to 0.002 percent, and a casting blank with the thickness of 320mm is prepared by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.3-10.7 min/cm, and the heating temperature is 1168-1171 ℃;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the first-stage rough rolling is more than or equal to 1002 ℃, and the total reduction rate of the rough rolling is more than 65%; in the second stage, the thickness of the intermediate billet is controlled to be 110mm, the intermediate billet is cooled to 851-854 ℃ through water and then starts to be rolled, and the final rolling temperature is 846-851 ℃;
s4, a cooling process: and cooling the rolled steel plate to 566-579 ℃ in air, and then taking the steel plate off line for stacking and slow cooling for more than 72 hours.
7. A method of producing normalized rolled S460N steel plate according to claim 5, wherein:
s1, a steel-making process: the converter deep dephosphorization molten steel P is less than or equal to 0.012 percent, the molten steel pretreatment dehydration and LF deep desulfurization molten steel S is less than or equal to 0.002 percent, and a casting blank with the thickness of 260-320 mm is prepared by continuous casting production;
s2, heating step: heating the casting blank in a heating furnace, wherein the heating coefficient is 10.5-11.2 min/cm, and the heating temperature is 1152-1161 ℃;
s3, rolling process: a two-stage controlled rolling process is adopted, wherein the final temperature of the rough rolling in the first stage is more than or equal to 993 ℃, and the total reduction rate of the rough rolling is more than 67%; in the second stage, the thickness of the intermediate blank is controlled to be 85-90 mm, the intermediate blank is cooled to 855-858 ℃ through water and is rolled, and the finish rolling temperature is 853-855 ℃;
s4, a cooling process: and cooling the rolled steel plate to 558-581 ℃ in air, and then performing stacking and slow cooling for more than 72 hours while taking the steel plate out of line.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411060A (en) * | 2022-01-10 | 2022-04-29 | 南京钢铁股份有限公司 | Production method for producing thin-specification high-strength structural steel plate by steckel mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411060A (en) * | 2022-01-10 | 2022-04-29 | 南京钢铁股份有限公司 | Production method for producing thin-specification high-strength structural steel plate by steckel mill |
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