CN113186452B - Production method of steel for thermal forming end socket - Google Patents

Production method of steel for thermal forming end socket Download PDF

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CN113186452B
CN113186452B CN202110337828.6A CN202110337828A CN113186452B CN 113186452 B CN113186452 B CN 113186452B CN 202110337828 A CN202110337828 A CN 202110337828A CN 113186452 B CN113186452 B CN 113186452B
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steel
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heat treatment
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CN113186452A (en
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徐琛
李建宇
何航
张勇伟
张计谋
龙渊
汪后明
刘立彪
刘晓玮
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Xiangtan Iron & Steel Co ltd Of Hunan Hualing Valin
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Xiangtan Iron & Steel Co ltd Of Hunan Hualing Valin
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite

Abstract

A production method of steel for a hot forming end socket comprises the following chemical components in percentage by mass: c = 0.14-0.17, Si = 0.15-0.40, Mn = 1.35-1.60, P is less than or equal to 0.012, S is less than or equal to 0.003, Alt = 0.020-0.050, Nb = 0.015-0.030, V = 0.020-0.040, N = 0.008-0.012, and the balance is Fe and residual elements; the carbon equivalent Ceq is less than or equal to 0.44 percent. The adopted process route is as follows: converter smelting → LF refining → VD (RH) vacuum refining → continuous casting → slab heating → controlled rolling → controlled cooling. The steel plate is subjected to high-temperature hot press forming, performance recovery heat treatment (normalizing), post-welding heat treatment, and the performances of the steel plate meet the following requirements: yield strength ReL is more than or equal to 310MPa, tensile strength Rm: 490-630 MPa, impact absorption energy KV2 at-20 ℃ is not less than 47J. The steel of the invention has the structure of ferrite and pearlite, the surface quality of the product is excellent, the qualification rate of external inspection is 100 percent, and the qualification rate of I-level flaw detection is 100 percent.

Description

Production method of steel for thermal forming end socket
Technical Field
The invention belongs to the technology of steel smelting, rolling and heat treatment, and relates to a production method of steel for a hot forming end socket.
Background
The end socket is one of the main pressure elements of the pressure container, and the manufacturing process of the end socket is subjected to processing procedures such as heating or non-heating, pressure forming, heat treatment for recovering performance, post-welding heat treatment after manufacturing equipment and the like. The manufactured end socket not only ensures that the final product meets the requirement of the design size, but also ensures that the mechanical property meets the design requirement.
The end socket forming is generally classified into cold forming and hot forming according to the control temperature. After cold forming and cold pressing deformation, the hardness and the strength of the end socket are increased, the plasticity and the toughness are reduced, the work hardening phenomenon occurs, the size precision and the thinning amount are poorer than those of hot forming during cold forming, and the end socket is subjected to corresponding heat treatment after forming to recover the performance of the material. The hot forming can greatly improve the plasticity of the material and reduce the deformation resistance through heating, the requirement on the capability of pressing equipment is reduced, the thinning amount is small, the forming size is good, and the size requirement can be well met. At present, with the large-scale equipment, the wall thickness and the size of the end socket are also increased continuously, so that the deformation resistance of the end socket is very large, and the end socket is not easy to form. In order to ensure the butt joint size of the end socket circular seam, the existing end socket is generally processed by thermal forming. For the commonly used 500 MPa-grade carbon steel plates, such as Q345R steel plates, SA516 steel plates and the like, when the end socket is prepared by adopting a hot forming process, because the steel plates are pressed at a higher temperature (930-980 ℃) in the hot forming process, the internal strengthening effect of the steel is weakened, the grain structure is coarsened, and the mechanical property is greatly reduced. Although the end socket is subjected to performance recovery heat treatment (normalizing heat treatment is generally required) after being formed, the strength and low-temperature impact performance of the material are greatly reduced after the material is subjected to post-welding heat treatment, and the requirement of product design is difficult to meet. In this case, the end closure often requires a heat treatment process of quenching + tempering to restore its properties. This has several adverse effects: 1) if the performance is recovered by adopting the normalizing heat treatment process, the performance of the end socket product is unstable, and greater risk is brought to the use of subsequent finished product equipment; 2) the performance recovery of the heat treatment process of quenching and tempering is adopted, so that the processing and manufacturing procedures are increased, the production period of the product is prolonged, and the delivery of the product is influenced to a certain extent; 3) the change of the heat treatment process for recovering the performance by adopting the heat treatment process of quenching and tempering greatly improves the production cost of enterprises; 4) the change of the process puts higher requirements on the equipment capacity of a seal head manufacturing factory, and matched equipment such as a cooling furnace, a tempering furnace and the like is required.
At present, with the continuous development of the market of high-end pressure vessels, new technical requirements are provided, such as low carbon equivalent, low temperature impact, increase of post-welding heat treatment temperature and time, performance guarantee at 1/2 plate thickness and the like. It is difficult to satisfy the customer demand by adopting the conventional ingredient system and production process, so new ingredients and processes need to be developed to satisfy the development trend of manufacturing high-end containers.
Disclosure of Invention
The invention aims to provide a production method of steel for a hot forming end socket, which is a steel plate for the hot forming end socket produced by adopting a method combining converter smelting, post-furnace refining, continuous casting, controlled rolling and controlled cooling. The steel plate is subjected to high-temperature hot press forming, performance recovery heat treatment (normalizing), post-welding heat treatment, yield strength ReL is more than or equal to 310MPa, and tensile strength Rm: 490-620 MPa, impact absorption energy KV2 at-20 ℃ is not less than 47J.
The technical scheme of the invention is as follows:
a production method of steel for a hot forming end socket comprises the following chemical components in percentage by mass: c = 0.14-0.17, Si = 0.15-0.40, Mn = 1.35-1.60, P is less than or equal to 0.012, S is less than or equal to 0.003, Alt = 0.020-0.050, Nb = 0.015-0.030, V = 0.020-0.040, N = 0.008-0.012, and the balance is Fe and residual elements; the carbon equivalent Ceq is less than or equal to 0.44 percent. Comprises the following process steps:
(1) converter steelmaking: tapping C is more than or equal to 0.06 percent, tapping P is less than or equal to 0.010 percent, and slag removing operation after the tapping is carried out;
(2) LF refining: the total argon blowing time of the molten steel in the LF furnace is more than or equal to 35min, and the white slag holding time is more than or equal to 15 min; carrying out soft argon blowing operation before the molten steel is discharged from the LF, wherein the soft argon blowing time is more than 5 min;
(3) VD (RH) refining: the total argon blowing time of the VD (RH) furnace in the station is more than or equal to 30min, the vacuum degree is below 0.5tor, and the holding time is more than or equal to 15 min; feeding a nitrogen line at a speed of 200-220 m/min for 250-300 m after the VD (RH) furnace is emptied, and feeding molten steel at a temperature of 1570-1585 ℃ during line feeding;
(4) continuous casting: the section of the continuous casting is 260mm or 300mm, the continuous casting is carried out with full-process protection casting, and the casting temperature is controlled according to the liquidus temperature plus (10-25) DEG C;
(5) heating the plate blank: heating the plate blank in a stepping furnace at 1170-1220 ℃;
(6) controlling rolling: the initial rolling temperature of the first stage is 1000-1150 ℃, the final rolling temperature is more than 950 ℃, and the reduction rate of the last three passes is more than 17%; the initial rolling temperature of the second stage is 800-880 ℃, and the final rolling temperature is more than or equal to 780 ℃;
(7) and (3) controlling cooling: and (3) after rolling, carrying out accelerated cooling on the steel plate at the cooling speed of 2-5 ℃/s and at the re-reddening temperature of 680-720 ℃.
The design principle of the chemical composition of the steel is as follows:
c: carbon often forms carbides with other alloying elements in steel and can play a strengthening role at room temperature or lower temperature. The carbon content should be maintained at a certain level in terms of securing the strength of the steel sheet, but should be reduced in terms of improving the toughness of the steel sheet. Therefore, in consideration of the alloy components and performance requirements of the steel, the C content of the steel is controlled to be 0.14-0.17%.
Si: solid solution is easily formed in ferrite, and the strength, particularly the yield strength, of the steel is improved, but if the content is too high, the low temperature toughness is lowered. The Si of the steel is controlled within the range of 0.15-0.40%, so that the comprehensive performance is favorable.
Mn: is a solid solution strengthening element, can refine crystal grains and is beneficial to improving the strength and the toughness of the steel plate.
P: the cold-brittle element is an easily segregated element which easily causes "cold brittleness" at the time of cold working, increases temper brittleness, and is very disadvantageous to the low-temperature toughness of steel. Therefore, the phosphorus content in the steel should be strictly controlled, and P in the steel of the present invention is controlled to be 0.012% or less.
S: the steel is not beneficial to improving the platform energy and the toughness, has the tendency of hot cracking, and has the content as low as possible, and the S in the steel is controlled within 0.003 percent.
Nb: it has strong affinity with nitrogen and carbon in steel, and can form stable Nb (C, N) compound with it. Nb (C, N) particles dispersed and distributed along austenite grain boundaries can greatly improve the coarsening temperature of original austenite grains, thereby refining ferrite grains and improving low-temperature toughness and strength.
V: has strong precipitation strengthening and fine grain strengthening effects, can improve the strength and toughness of steel, reduce the overheating sensitivity and improve the thermal stability. The steel controls V to be 0.020-0.040%.
N: nitrogen is microalloyed with vanadium to optimize the precipitation of vanadium so as to refine ferrite grains, fully play the roles of two strengthening modes of fine grain strengthening and precipitation strengthening and greatly improve the toughness and toughness matching of steel. The steel of the invention controls N to be 0.008% -0.012%.
According to the invention, through reasonable design of chemical components of steel, production process parameters of each process step are strictly controlled, and cleanliness of the steel is ensured through LF refining and vacuum degassing treatment processes; and the process of rolling and cooling control is adopted, so that the product finally obtained has excellent physical quality and various performances. The end socket steel plate with the thickness of 20-80 mm is produced by the method, and is subjected to high-temperature hot press forming (process: temperature of 950 +/-20 ℃, heat preservation time of 1.2-1.5 min/mm), recovery performance heat treatment (normalizing process: temperature of 870-890 ℃, heat preservation time of 1.5-2.0 min/mm), post-welding heat treatment (process: temperature of 610 +/-15 ℃, heat preservation time of 12 hours), the performance of the end socket steel plate can meet the requirements of table 1, the structure of the end socket steel plate is ferrite and pearlite, and the grain size reaches 9.0-11.0 grade.
TABLE 1 Performance index of the steels
The invention has the following advantages: a. the component design adopts a lower carbon component system, and the vanadium-nitrogen alloy strengthening is formed by adding N elements on the basis of adding Nb and V microalloy elements in steel, so that the performance of the steel plate after high-temperature hot press forming, performance recovery heat treatment and postweld heat treatment meets the technical requirements of table 1 on the basis of meeting the requirement that the carbon equivalent Ceq of the material is lower than or equal to 0.44%; b. selecting a reasonable plate blank heating process, assisting in a low-speed rolling process under high temperature and high pressure, a controlled rolling and controlled cooling process, and improving the toughness of the steel plate by utilizing mutagenic precipitation in the rolling process and precipitation after rolling; c. the low-temperature toughness and the like of the steel plate are further improved by strictly controlling P, S harmful elements; d. after the steel plate is subjected to high-temperature hot press forming, performance recovery heat treatment (normalizing), postweld heat treatment, the structure of the steel plate is uniform and fine ferrite and pearlite, the grain size reaches over 9.0 grade, and the comprehensive mechanical property of the steel plate is ensured.
Drawings
FIG. 1 is a metallographic structure diagram of example 2.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1:
a production method of steel for a hot forming end socket comprises the following steps of enabling chemical components of the steel to be in percentage by mass as shown in a table 2. The implementation process of the steel-making process comprises the following steps: tapping C =0.08% and P =0.007% by the converter, and carrying out slag skimming after tapping. Keeping the LF refining white slag for 21min, and leaving S = 0.0015%; VD vacuum degree is 0.4tor, vacuum maintaining time is 16min, nitrogen line is fed after vacuum breaking, the speed of nitrogen line is 200m/min, molten steel temperature is 1578 ℃ when wire feeding is started, and molten steel temperature is 1574 ℃ when wire feeding is finished. The soft argon blowing time is 17min, and the hydrogen is determined to be 1.2 ppm. The thickness of a continuous casting section is 260mm, the superheat degree of molten steel of a continuous casting tundish is 12-17 ℃, and the smelting components are shown in Table 2.
The steel rolling process comprises the following implementation processes: the heating tapping temperature of the casting blank is 1192 ℃, the starting rolling temperature of the first stage is 1080 ℃, the reduction rates of the last three passes are respectively 18 percent, 20 percent and 22 percent, the final rolling temperature is 1000 ℃, and the thickness of the rolled intermediate blank is 75 mm. The second stage is at the start rolling temperature of 870 ℃ and the finish rolling temperature of 815 ℃, and the thickness of the rolled product is 20 mm. And ACC cooling is carried out after the steel plate is rolled, and the temperature of red returning is 695 ℃. And finally obtaining the steel plate. The steel plate is subjected to high-temperature hot press forming (process: temperature 950 ℃, heat preservation time 30 min) + recovery performance heat treatment (normalizing process: temperature 870 ℃, heat preservation time 35 min) + postweld heat treatment (process: temperature 610 ℃, heat preservation time 12 h), and the performances are shown in Table 3.
Example 2:
a production method of steel for a hot forming end socket comprises the following steps of enabling chemical components of the steel to be in percentage by mass as shown in a table 2. The implementation process of the steel-making process comprises the following steps: the implementation process of the steel-making process comprises the following steps: tapping C =0.08% and P =0.008% by the converter, and carrying out slag skimming after tapping. Keeping the LF refining white slag for 20min, and leaving S = 0.0013%; VD vacuum degree is 0.4tor, vacuum maintaining time is 18min, nitrogen line 285m is fed after the vacuum is broken, the speed of nitrogen line is 200m/min, molten steel temperature is 1580 ℃ when wire feeding is started, and molten steel temperature is 1575 ℃ when wire feeding is finished. The soft argon blowing time is 16min, and the hydrogen is determined to be 1.3 ppm. The thickness of a continuous casting section is 300mm, the superheat degree of molten steel of a continuous casting tundish is 13-17 ℃, and the smelting components are shown in Table 2.
The steel rolling process comprises the following implementation processes: the heating tapping temperature of the casting blank is 1205 ℃, the starting rolling temperature of the first stage is 1090 ℃, the reduction rates of the last three passes are respectively 18 percent, 19 percent and 20 percent, the final rolling temperature is 1010 ℃, and the thickness of the rolled intermediate blank is 125 mm. The second stage has the initial rolling temperature of 820 ℃, the final rolling temperature of 798 ℃ and the thickness of a rolled finished product of 50 mm. And (3) cooling the steel plate by ACC after rolling, wherein the temperature of the steel plate is 686 ℃ to be red. And finally obtaining the steel plate. The steel plate is subjected to high-temperature hot-press forming (process: temperature 950 ℃, heat preservation time 70 min) + recovery performance heat treatment (normalizing process: temperature 880 ℃, heat preservation time 90 min) + postweld heat treatment (process: temperature 610 ℃, heat preservation time 12 h), the performance is shown in Table 3, and the metallographic structure is shown in FIG. 1.
Example 3:
a production method of steel for a hot forming end socket comprises the following steps of enabling chemical components of the steel to be in percentage by mass as shown in a table 2. The steel making process was performed as in example 2.
The steel rolling process comprises the following implementation processes: the heating tapping temperature of the casting blank is 1198 ℃, the starting rolling temperature of the first stage is 1090 ℃, the reduction rates of the last three passes are respectively 18 percent, 18 percent and 19 percent, the final rolling temperature is 1005 ℃, and the thickness of the rolled intermediate blank is 140 mm. The second stage has the initial rolling temperature of 820 ℃, the final rolling temperature of 805 ℃ and the thickness of a rolled product of 80 mm. And (3) carrying out ACC cooling after the steel plate is rolled, wherein the temperature of the red returning is 688 ℃. And finally obtaining the steel plate. The steel plate is subjected to high-temperature hot press forming (process: temperature 950 ℃, heat preservation time 110 min) + recovery performance heat treatment (normalizing process: temperature 880 ℃, heat preservation time 145 min) + post-weld heat treatment (process: temperature 610 ℃, heat preservation time 12 hours), and the performances are shown in Table 3.
Table 2 examples melt chemistry composition (wt.%)
TABLE 3 Performance test results of the steels of examples
As can be seen from Table 2 above, the compositions of the examples meet the design composition requirements. As can be seen from table 3 above, after the steel of the present invention is subjected to high temperature hot press forming, property recovery heat treatment (normalizing), and post-weld heat treatment, the steel plate has good strength, good low temperature toughness, and good bending process performance, completely meets the technical requirements of table 1, and can be used for manufacturing end sockets of related equipment in petrochemical industry. As can be seen from fig. 1, the structure is fine ferrite and pearlite in a dispersed manner.

Claims (1)

1. A production method of steel for a hot forming end socket is characterized by comprising the following steps: the steel comprises the following chemical components, by mass, 0.14-0.17% of C, 0.15-0.40% of Si, 1.35-1.60% of Mn, 0.012% of P, 0.003% of S, 0.020-0.050% of Alt, 0.015-0.030% of Nb, 0.020-0.040% of V, 0.008-0.012% of N and the balance of Fe and residual elements; the carbon equivalent Ceq is less than or equal to 0.44 percent; comprises the following process steps:
(1) converter steelmaking: tapping C is more than or equal to 0.06 percent, tapping P is less than or equal to 0.010 percent, and slag removing operation after the tapping is carried out;
(2) LF refining: the total argon blowing time of the molten steel in the LF furnace is more than or equal to 35min, and the white slag holding time is more than or equal to 15 min; carrying out soft argon blowing operation before the molten steel is discharged from the LF, wherein the soft argon blowing time is more than 5 min;
(3) VD refining: the total argon blowing time of the VD furnace in the station is more than or equal to 30min, the vacuum degree is below 0.5tor, and the holding time is more than or equal to 15 min; feeding a nitrogen line to the VD furnace after the VD furnace is empty, wherein the linear speed of the nitrogen line is 200-220 m/min, and the temperature of molten steel is 1570-1585 ℃ during line feeding;
(4) continuous casting: the section of the continuous casting is 260mm or 300mm, the continuous casting is carried out with full-process protection casting, and the casting temperature is controlled according to the liquidus temperature plus (10-25) DEG C;
(5) heating the plate blank: heating the plate blank in a stepping furnace at 1170-1220 ℃;
(6) controlling rolling: the initial rolling temperature of the first stage is 1000-1150 ℃, the final rolling temperature is more than 950 ℃, and the reduction rate of the last three passes is more than 17%; the initial rolling temperature of the second stage is 800-880 ℃, and the final rolling temperature is more than or equal to 780 ℃;
(7) and (3) controlling cooling: after rolling, carrying out accelerated cooling on the steel plate, wherein the cooling speed is 2-5 ℃/s, and the temperature of red return is 680-720 ℃;
(8) and (3) post-processing: hot-pressing the steel plate at high temperature, wherein the temperature is 950 +/-20 ℃, and the heat preservation time is 1.2-1.5 min/mm; performing heat treatment for restoring performance, wherein the normalizing process temperature is 870-890 ℃, and the heat preservation time is 1.5-2.0 min/mm; and (3) carrying out postweld heat treatment at the temperature of 610 +/-15 ℃ for 12 hours, wherein the obtained steel has a structure of ferrite and pearlite and has a grain size of 9.0-11.0 grade.
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CN106756514A (en) * 2017-01-24 2017-05-31 舞阳钢铁有限责任公司 A kind of special thickness steel plate for building structure of high intensity normalizing type and its production method
CN109097681A (en) * 2018-08-15 2018-12-28 敬业钢铁有限公司 A kind of high intensity is low to be mingled with autobody sheet and its continuous casting process electromagnetic agitation technique
CN109161800A (en) * 2018-09-25 2019-01-08 湖南华菱湘潭钢铁有限公司 A kind of production method of the anti-SSCC liquefied gas truck tank tank body steel of low temperature
CN109234624A (en) * 2018-10-08 2019-01-18 鞍钢股份有限公司 A kind of special thick nuclear power conventional island equipment steel of extra wide and its manufacturing method
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