CN116145031A - Low-carbon high-toughness 16MnDR steel plate and production method thereof - Google Patents
Low-carbon high-toughness 16MnDR steel plate and production method thereof Download PDFInfo
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- CN116145031A CN116145031A CN202211681879.1A CN202211681879A CN116145031A CN 116145031 A CN116145031 A CN 116145031A CN 202211681879 A CN202211681879 A CN 202211681879A CN 116145031 A CN116145031 A CN 116145031A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 95
- 239000010959 steel Substances 0.000 title claims abstract description 95
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000007670 refining Methods 0.000 claims abstract description 36
- 238000009749 continuous casting Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 8
- 238000009847 ladle furnace Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 21
- 229910052717 sulfur Inorganic materials 0.000 abstract description 20
- 238000003466 welding Methods 0.000 abstract description 6
- 238000005266 casting Methods 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 239000010955 niobium Substances 0.000 description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- 239000011593 sulfur Substances 0.000 description 8
- 229910052758 niobium Inorganic materials 0.000 description 7
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000011572 manganese Substances 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a low-carbon high-toughness 16MnDR steel plate and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c:0.07% -0.09%, si:0.15% -0.30%, mn:1.50 to 1.60 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.003 percent, nb:0.030% -0.035%, the balance of Fe and unavoidable impurities; the production method of the steel plate comprises the working procedures of primary refining in an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing. According to the invention, through reducing C and harmful elements P, S in steel, properly adding Nb refined grains, and through matched rolling and heat treatment processes, the 16MnDR steel plate with good low-temperature toughness and welding performance is obtained, the yield strength of the steel plate is more than or equal to 300MPa, the tensile strength is 470-580MPa, and the transverse impact energy average value at-50 ℃ is more than or equal to 120J.
Description
Technical Field
The invention belongs to the technical field of material engineering, and particularly relates to a low-carbon high-toughness 16MnDR steel plate and a production method thereof.
Background
16MnDR is a brand in GB3531-2014 standard, belongs to a steel plate for a low-temperature pressure container, is delivered in a normalizing or normalizing and tempering state, and is widely applied to manufacturing of storage containers and conveying pipelines for various liquid enanes, natural gas liquefying devices, petroleum gas equipment and storage facilities, hydrogenation reaction devices and the like. The 16MnDR steel sheet is used in a low temperature environment and is generally used under welding conditions, and thus the steel sheet is required to have particularly good low temperature toughness and excellent welding performance.
The carbon (C) content has a remarkable influence on the weldability and low-temperature toughness of the steel sheet, but carbon can improve the strength of the steel, so that the lower the carbon content is, the more advantageous the weldability and low-temperature toughness of the steel is under the premise of ensuring the strength of the steel sheet.
Through retrieval, the patent application document with the application number of 201110176655 discloses a 120mm low-temperature pressure vessel steel 16MnDR thick plate, wherein the carbon content is 0.10% -0.17%, the phosphorus content is less than or equal to 0.015%, the sulfur content is less than or equal to 0.005%, the carbon, phosphorus and sulfur contents are higher, and the low-temperature impact performance at-30 ℃ can be ensured only.
As another patent application document with the application number of 201110462084 discloses a normalized 16MnDR low temperature pressure vessel steel plate, the carbon content is 0.15% -0.17%, the phosphorus content is less than or equal to 0.015%, the sulfur content is less than or equal to 0.005%, the carbon, phosphorus and sulfur contents are also higher, and the surface crack is easy to generate by adopting a high vanadium design.
As another patent application document with the application number of 201711182146 discloses a 16MnDR steel plate for a low temperature pressure container with the thickness of 130mm, wherein the carbon content is 0.10% -0.17%, the phosphorus content is less than or equal to 0.015%, the sulfur content is less than or equal to 0.005%, and the Ni content is 0.10% -0.20%, so that the carbon, phosphorus and sulfur contents are higher, noble metal Ni is added, and the alloy cost is increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-carbon high-toughness 16MnDR steel plate and a production method thereof, wherein C and harmful elements P, S in the steel are reduced, nb is properly added to refine grains, and the steel plate with good low-temperature toughness and welding performance is obtained through matched rolling and heat treatment processes.
In order to solve the technical problems, the invention adopts the following technical scheme:
the low-carbon high-toughness 16MnDR steel plate comprises the following chemical components in percentage by mass: c:0.07% -0.09%, si:0.15% -0.30%, mn:1.50 to 1.60 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.003 percent, nb:0.030% -0.035%, and the balance of Fe and unavoidable impurities.
The invention also provides a production method of the low-carbon high-toughness 16MnDR steel plate, which comprises the working procedures of primary refining in an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing.
In the primary smelting and LF refining process of the electric furnace, molten steel is smelted by the electric furnace and dephosphorized deeply, and is sent into an LF ladle furnace for refining, deoxidized deeply and desulfurized, and the components of the molten steel are adjusted to the following mass percent: c:0.07% -0.09%, si:0.15% -0.30%, mn:1.50 to 1.60 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.003 percent, nb:0.030% -0.035%, and the balance of Fe and unavoidable impurities.
The vacuum degree of the VD vacuum treatment process is 50-60Pa, and the holding time is 15-17min.
The continuous casting process adopts whole-course argon seal protection casting, and maintains steady casting to form casting blanks.
According to the rolling process, after a continuous casting billet is heated, rolling is controlled by adopting a stage II, the rolling start temperature is 850-870 ℃, the two single-pass rolling reduction is ensured to be 15-20%, and the fine crystal strengthening effect of Nb is exerted by controlling rolling; after the steel plate is rolled, water is quickly cooled to 660-700 ℃ to avoid grain growth.
In the normalizing heat treatment process, the steel plate is heated to 880-900 ℃, kept at the temperature of 1.2-1.5min/mm, and discharged for air cooling.
The thickness of the steel plate is 16-60mm.
The mechanical properties of the steel plate provided by the invention are as follows: the yield strength is more than or equal to 300MPa, the tensile strength is 470-580MPa, and the transverse impact energy average value at-50 ℃ is more than or equal to 120J.
The 16MnDR steel plate provided by the invention has low carbon content, the C content is as low as 0.07% -0.09%, which is less common in the grade normalized steel, and the strength index of the steel plate can be ensured by matching with optimized component design and proper rolling and cooling processes.
The strength loss of the steel sheet is inevitably caused by the reduction of the carbon content, by adding an appropriate amount of niobium (Nb): 0.030% -0.035%, and the strengthening effect of niobium fine crystal is utilized. When the niobium carbonitride (Nb (C, N)) is thermally processed at 1100-900 ℃, the grain boundary can be pinned, the pinning force is larger than the recrystallization trend at the temperature, the recrystallization is not generated, the deformation can be accumulated, and the growth of grains is prevented; niobium has a strong column of dragging grain boundary mobility because niobium has a much larger atomic radius than iron, and solid solution Nb is enriched in grain boundaries and is lower in the grain. The dual effects of niobium show strong effect of preventing grain growth, and researches show that the Nb content is 0.030% -0.035%, and the steel plate has optimal grain refining effect. In addition, the invention ensures that the larger rolling reduction of two passes is 15-20% at the lower II stage rolling temperature, plays a role of deformation induction phase change, further achieves better grain refinement effect, not only can improve the strength of the steel plate, but also can improve the low-temperature toughness of the steel.
Manganese (Mn) can increase toughness, strength and hardness of steel, and manganese is low in cost, so that the manganese content adopts an upper limit range: 1.50% -1.60%.
Phosphorus (P) is a harmful element in steel, and causes a phenomenon of "cold embrittlement", which greatly reduces plasticity and low-temperature toughness of steel, and reduces low-temperature properties of steel plates after welding, and thus, it is required that the phosphorus content in steel be as low as possible. Sulfur (S) reduces the ductility and toughness of steel, causing cracks during forging and rolling. Therefore, the content of phosphorus and sulfur in the steel should be reduced as much as possible, and the design is that: p is less than or equal to 0.010 percent, S is less than or equal to 0.005 percent.
The beneficial effects of adopting above-mentioned technical scheme lie in: according to the invention, the carbon content in the steel is reduced, a proper amount of niobium fine crystals are added for strengthening, and proper rolling and heat treatment processes are matched, so that the obtained steel plate has good low-temperature toughness and good welding performance.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The low-carbon high-toughness 16MnDR steel plate has a thickness of 16mm and comprises the following chemical components in percentage by mass: c:0.07%, si:0.15%, mn:1.50%, P:0.010%, S:0.003%, nb:0.030%, the balance being Fe and unavoidable impurities.
The production method of the low-carbon high-toughness 16MnDR steel plate comprises the procedures of primary refining by an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing, and specifically comprises the following steps:
primary refining in an electric furnace and LF refining: molten steel is smelted by an electric furnace and dephosphorized deeply, and is sent into an LF ladle furnace for refining, deoxidized deeply and desulfurized, and the components of the molten steel are adjusted to reach the components in percentage by mass, C:0.07%, si:0.15%, mn:1.50%, P:0.010%, S:0.003%, nb:0.030%, the balance being Fe and unavoidable impurities.
VD vacuum treatment process: vacuum degree 50Pa, holding time 15min.
Continuous casting process: and adopting whole argon seal protection casting, and keeping steady casting to form a casting blank.
And (3) rolling: heating a continuous casting blank, and adopting a II stage control rolling process, wherein the II stage rolling start temperature is 850 ℃, and the reduction of two single passes is 15% and 17%; the steel plate is rapidly cooled to 660 ℃ after rolling.
Normalizing heat treatment process: heating the steel plate to 880 ℃, preserving heat for 1.5min/mm, discharging and air cooling.
Mechanical properties of the steel sheet of this example: the yield strength is 325MPa, the tensile strength is 505MPa, and the transverse impact energy average value at-50 ℃ is 180J.
Example 2
The low-carbon high-toughness 16MnDR steel plate has a thickness of 28mm and comprises the following chemical components in percentage by mass: c:0.08%, si:0.30%, mn:1.60%, P:0.008%, S:0.002%, nb:0.035%, the balance being Fe and unavoidable impurities.
The production method of the low-carbon high-toughness 16MnDR steel plate comprises the procedures of primary refining by an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing, and specifically comprises the following steps:
primary refining in an electric furnace and LF refining: molten steel is smelted by an electric furnace and dephosphorized deeply, and is sent into an LF ladle furnace for refining, deoxidized deeply and desulfurized, and the components of the molten steel are adjusted to reach the components in percentage by mass, C:0.08%, si:0.30%, mn:1.60%, P:0.008%, S:0.002%, nb:0.035%, the balance being Fe and unavoidable impurities.
VD vacuum treatment process: vacuum degree 60Pa, holding time 17min.
Continuous casting process: and adopting whole argon seal protection casting, and keeping steady casting to form a casting blank.
And (3) rolling: heating a continuous casting blank, and adopting a II stage to control rolling, wherein the II stage rolling start temperature is 870 ℃, and the reduction of two single passes is 16% and 20%; the steel plate is rapidly cooled to 700 ℃ after rolling.
Normalizing heat treatment process: heating the steel plate to 900 ℃, preserving heat for 1.2min/mm, discharging and air cooling.
Mechanical properties of the steel sheet of this example: the yield strength is 300MPa, the tensile strength is 470MPa, and the transverse impact energy average value at-50 ℃ is 223J.
Example 3
The low-carbon high-toughness 16MnDR steel plate has a thickness of 40mm and comprises the following chemical components in percentage by mass: c:0.09%, si:0.25%, mn:1.53%, P:0.006%, S:0.001%, nb:0.032% and the balance of Fe and unavoidable impurities. .
The production method of the low-carbon high-toughness 16MnDR steel plate comprises the procedures of primary refining by an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing, and specifically comprises the following steps:
primary refining in an electric furnace and LF refining: molten steel is smelted by an electric furnace and dephosphorized deeply, and is sent into an LF ladle furnace for refining, deoxidized deeply and desulfurized, and the components of the molten steel are adjusted to reach the components in percentage by mass, C:0.09%, si:0.25%, mn:1.53%, P:0.006%, S:0.001%, nb:0.032% and the balance of Fe and unavoidable impurities.
VD vacuum treatment process: vacuum degree 55Pa, holding time 16min.
Continuous casting process: and adopting whole argon seal protection casting, and keeping steady casting to form a casting blank.
And (3) rolling: heating a continuous casting blank, and adopting a II stage control rolling method, wherein the II stage rolling temperature is 860 ℃, and the reduction of two single passes is 15% and 18%; the steel plate is rapidly cooled to 680 ℃ after rolling.
Normalizing heat treatment process: heating the steel plate to 890 ℃, preserving the temperature for 1.3min/mm, discharging and air cooling.
The mechanical property of the steel plate of the embodiment has the yield strength of 365MPa, the tensile strength of 580MPa and the transverse impact energy average value of 256J at-50 ℃.
Example 4
The low-carbon high-toughness 16MnDR steel plate has a thickness of 50mm and comprises the following chemical components in percentage by mass: c:0.075%, si:0.22%, mn:1.56%, P:0.004%, S:0.003%, nb:0.033% and the balance of Fe and unavoidable impurities. .
The production method of the low-carbon high-toughness 16MnDR steel plate comprises the procedures of primary refining by an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing, and specifically comprises the following steps:
primary refining in an electric furnace and LF refining: molten steel is smelted by an electric furnace and dephosphorized deeply, and is sent into an LF ladle furnace for refining, deoxidized deeply and desulfurized, and the components of the molten steel are adjusted to reach the components in percentage by mass, C:0.075%, si:0.22%, mn:1.56%, P:0.004%, S:0.003%, nb:0.033% and the balance of Fe and unavoidable impurities.
VD vacuum treatment process: vacuum degree 56Pa, holding time 17min.
Continuous casting process: and adopting whole argon seal protection casting, and keeping steady casting to form a casting blank.
And (3) rolling: heating a continuous casting blank, and adopting a II stage control rolling process, wherein the II stage rolling start temperature is 865 ℃, and the reduction of two single passes is 18% and 19%; the steel plate is rapidly cooled to 665 ℃ after rolling.
Normalizing heat treatment process: heating the steel plate to 885 ℃, preserving heat for 1.35min/mm, discharging and air cooling.
Mechanical properties of the steel sheet of this example: the yield strength is 370MPa, the tensile strength is 580MPa, and the transverse impact energy average value at-50 ℃ is 120J.
Example 5
The low-carbon high-toughness 16MnDR steel plate has a thickness of 60mm and comprises the following chemical components in percentage by mass: c:0.075%, si:0.26%, mn:1.58%, P:0.010%, S:0.001%, nb:0.032% and the balance of Fe and unavoidable impurities. .
The production method of the low-carbon high-toughness 16MnDR steel plate comprises the procedures of primary refining by an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing, and specifically comprises the following steps:
primary refining in an electric furnace and LF refining: molten steel is smelted by an electric furnace and dephosphorized deeply, and is sent into an LF ladle furnace for refining, deoxidized deeply and desulfurized, and the components of the molten steel are adjusted to reach the components in percentage by mass, C:0.075%, si:0.26%, mn:1.58%, P:0.010%, S:0.001%, nb:0.032% and the balance of Fe and unavoidable impurities.
VD vacuum treatment process: vacuum degree is 53Pa, and holding time is 16min.
Continuous casting process: and adopting whole argon seal protection casting, and keeping steady casting to form a casting blank.
And (3) rolling: heating a continuous casting blank, and adopting a II stage control rolling process, wherein the II stage rolling temperature is 862 ℃, and the reduction of two single passes is 15% and 19%; after rolling, the steel plate is quickly cooled to 690 ℃.
Normalizing heat treatment process: heating the steel plate to 896 ℃, preserving heat for 1.45min/mm, discharging and air cooling.
Mechanical properties of the steel sheet of this example: yield strength 363MPa, tensile strength 560MPa, and transverse impact energy mean value 282J at 50 ℃.
Claims (7)
1. The low-carbon high-toughness 16MnDR steel plate is characterized by comprising the following chemical components in percentage by mass: c:0.07% -0.09%, si:0.15% -0.30%, mn:1.50 to 1.60 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.003 percent, nb:0.030% -0.035%, and the balance of Fe and unavoidable impurities.
2. The low-carbon high-toughness 16MnDR steel sheet according to claim 1, wherein the steel sheet has mechanical properties of: the yield strength is more than or equal to 300MPa, the tensile strength is 470-580MPa, and the transverse impact energy average value at-50 ℃ is more than or equal to 120J.
3. A low carbon high toughness 16MnDR steel according to claim 1, wherein said steel has a thickness of 16-60mm.
4. The production method of the low-carbon high-toughness 16MnDR steel plate according to claim 1 is characterized in that the production method of the steel plate comprises the procedures of primary refining in an electric furnace, LF refining, VD vacuum treatment, continuous casting, rolling and normalizing;
the primary smelting and LF refining processes of the electric furnace are that molten steel is smelted by the electric furnace and dephosphorized deeply, and then is sent into an LF ladle furnace for refining, deoxidized deeply and desulfurated, and the components of the molten steel are adjusted to the following mass percent: c:0.07% -0.09%, si:0.15% -0.30%, mn:1.50 to 1.60 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.003 percent, nb:0.030% -0.035%, and the balance of Fe and unavoidable impurities.
5. The method for producing a low-carbon high-toughness 16MnDR steel sheet according to claim 4, wherein the vacuum degree of the VD vacuum treatment process is 50-60Pa, and the holding time is 15-17min.
6. The method for producing the low-carbon high-toughness 16MnDR steel plate according to claim 4, wherein the rolling procedure is characterized in that, after the continuous casting billet is heated, the rolling is controlled by adopting a II stage, the rolling start temperature is 850-870 ℃ in the II stage, and the two single-pass rolling reduction is ensured to be 15% -20%; after the steel plate is rolled, water is quickly cooled to 660-700 ℃.
7. The method for producing a low-carbon high-toughness 16MnDR steel sheet according to claim 4, wherein the normalizing heat treatment process comprises the steps of heating the steel sheet to 880-900 ℃, preserving heat for 1.2-1.5min/mm, discharging and air cooling.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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