CN112375963A - Low-alloy low-carbon equivalent steel plate and production method thereof - Google Patents

Low-alloy low-carbon equivalent steel plate and production method thereof Download PDF

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CN112375963A
CN112375963A CN202011011542.0A CN202011011542A CN112375963A CN 112375963 A CN112375963 A CN 112375963A CN 202011011542 A CN202011011542 A CN 202011011542A CN 112375963 A CN112375963 A CN 112375963A
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low
equal
steel plate
temperature
less
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李�杰
龙杰
庞辉勇
吕建会
任鑫磊
温海荣
蒙耀华
张亚丽
郭恒斌
贺霄
陈起
张西忠
李峥
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Wuyang Iron and Steel Co Ltd
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    • 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
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a low-alloy low-carbon equivalent steel plate and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c is less than or equal to 0.20 percent, Si: 0.15 to 0.40%, Mn: 0.85-1.20%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Nb: less than or equal to 0.020%, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment. The invention adopts the low CE, adds the Nb composition design, and meets the higher requirement of the market on the low-alloy low-temperature impact toughness property excellent low-carbon steel plate through the heat treatment process of accelerated cooling after normalizing, thereby realizing the upgrading and updating of the traditional product.

Description

Low-alloy low-carbon equivalent steel plate and production method thereof
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a low-alloy low-carbon equivalent steel plate and a production method thereof.
Background
The steel SA516Gr60 is a traditional container steel, the general component system is C and Mn, and the alloy elements Nb and Ni are added to meet the requirements of the strength of the steel plate and the low-temperature impact property of the steel plate at-46 ℃, wherein Nb (0.015-0.020)%, Ni (0.20-0.25)%, and the CE of the steel plate is generally required to be about 0.40% (CE = C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15, and the formula is adopted for the CE in the following text).
In order to meet the requirements of low alloy low carbon equivalent of the steel plate on the market and excellent low temperature impact toughness and excellent welding performance, the existing technological process and component design of the steel plate need to be optimized and reconstructed, and higher quality requirements are met by using lower alloy content and carbon equivalent, so that old varieties are upgraded and replaced.
The current process optimization idea mainly comprises the following steps: firstly, C, Mn content is maintained, Ni is eliminated, and Nb alloy elements beneficial to the impact toughness of the steel plate are reserved, so that the low carbon equivalent of the steel plate is ensured, and meanwhile, various performance indexes of the steel plate meet the standard requirements; and secondly, optimizing the heat treatment process, wherein the heat treatment process in the original component design is normalizing, the design of Nb alloy element components which are beneficial to the impact toughness of the steel plate is adopted instead of Ni, the original heat treatment process cannot meet the performance index of the steel plate, and the heat treatment process needs to adopt a mode of accelerating cooling after normalizing.
Aiming at the special performance characteristics of low yield and high tensile strength of SA516Gr60, the method maintains the content of C, Mn, eliminates Ni, reduces CE, maintains the component design of Nb alloy elements beneficial to the impact toughness of the steel plate to meet the requirement of the steel plate on low-temperature impact toughness, ensures the strength level of the steel plate through the heat treatment process after accelerated cooling after normalizing, refines crystal grains through the addition process of microalloy Nb elements, realizes the requirement of meeting the low-alloy low-carbon equivalent of the SA516Gr60 steel plate and the excellent low-temperature impact toughness and excellent welding performance at the same time, achieves the upgrading and updating of the traditional old products, and has important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-alloy low-carbon equivalent steel plate and a production method thereof. The invention meets the requirement of excellent welding performance of the steel plate by adopting the component design of low C, Mn and low CE, ensures the strength level of the steel plate by the accelerated cooling heat treatment process after normalizing, refines crystal grains by adding microalloy Nb element, realizes the requirement of meeting the requirements of excellent low-temperature impact toughness and excellent welding performance on the low alloy low equivalent weight of the SA516Gr60 steel plate, and achieves the upgrading and updating of the traditional old products.
In order to solve the technical problems, the invention adopts the technical scheme that:
the low-alloy low-carbon equivalent steel plate comprises the following chemical components in percentage by mass: c is less than or equal to 0.20 percent, Si: 0.15 to 0.40%, Mn: 0.85-1.20%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Nb: less than or equal to 0.020 percent, and the balance of Fe and inevitable impurities.
The thickness of the steel plate is 8-80 mm, and the CE of the steel plate is less than or equal to 0.35%.
The steel plate has a delivery state of not less than 100J at-46 ℃ and a transverse impact mean value; the steel plate delivery state performance: the yield strength is more than or equal to 220MPa, the tensile strength is 415-550 MPa, and the elongation is more than or equal to 25%.
The invention also provides a production method of the low-alloy low-carbon equivalent steel plate, which comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment; in the heat treatment process, the normalizing heat preservation temperature is 880-900 ℃, the heat preservation coefficient is 1.5-4 min/mm, the heat preservation time is not less than 60min, and the cooling is accelerated.
In the smelting process, the steel ladle is well baked, and the baking temperature is more than or equal to 900 ℃; the steel tapping temperature is more than 1600 ℃, the steel tapping C is less than or equal to 0.10 percent, the concentrate is adopted as far as possible, no briquetting, slag steel, ladle bottom, waste ingot mold and the like are added, and the steel grade cannot be smelted when the conditions of a new ladle, a large fettling furnace and a furnace are abnormal.
According to the LF refining process, good argon blowing is guaranteed in the whole process, the white slag refining time is more than or equal to 30min, the total LF refining time is more than or equal to 50min, the consumption of aluminum wires is 2.5 to 5 kg/t of steel, the consumption of lime is more than or equal to 18 kg/t of steel, the consumption of deoxidizer ferrosilicon is more than or equal to 2.5 kg/t of steel, the aluminum content in the process is more than or equal to 0.015%, the drossing aluminum is more than or equal to 0.020%, and S is less than or equal to 0.005%.
According to the VD vacuum refining process, the vacuum degree is less than or equal to 40Pa, the vacuum maintaining time is more than or equal to 25min, 1-2.5 kg of Ca-Fe wire per t of steel is added before vacuum, argon cannot be blown greatly during vacuum pumping, the argon flow is 260-320L/min, and Al wire feeding is not allowed after vacuum pumping.
In the continuous casting process, the liquidus temperature is 1515-1535 ℃; the thickness of the continuous casting billet is 200-330 mm.
According to the heating process, the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1220-1240 ℃, the heat preservation time of the soaking section is more than or equal to 60min, the heating time coefficient is more than or equal to 10min/mm, and the thorough burning and uniformity of the billet are ensured.
The heating procedure comprises a stage II rolling temperature of 880-910 ℃, a finishing temperature of 780-880 ℃ and a water cooling and re-reddening temperature of 680-720 ℃.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. the invention adopts the low C, Mn and low CE, adds Nb component design, and obtains the low-alloy low-carbon equivalent steel plate with the thickness specification of 8-80 mm and the CE of the steel plate less than or equal to 0.35 percent by the heat treatment process after normalizing and accelerated cooling; the average value of transverse impact of the steel plate in the delivery state at minus 46 ℃ is more than or equal to 100J; the steel plate delivery state performance: the yield strength is more than or equal to 220MPa, the tensile strength is 415-550 MPa, and the elongation is more than or equal to 25%.
2. The invention meets the market requirements on low alloy low carbon equivalent, excellent low temperature impact toughness and excellent welding performance, and realizes the upgrading and updating of traditional products.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 18mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 920 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1611 ℃, and the tapping temperature is as follows: 0.14 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 32min, the total time of LF refining is 60min, the consumption of aluminum wires is 3.2 kg/t steel, the consumption of lime is 19 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.8 kg/t steel, the aluminum content in the process is 0.016%, the slagging aluminum is 0.021%, and the refining is finished S: 0.004%;
(3) VD vacuum refining: the vacuum degree is 38Pa, the vacuum maintaining time is 25min, 1.6 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 280L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1520 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1240 ℃, the heat preservation time of the soaking section is 80min, and the heating time coefficient is 11min/cm, so that the complete and uniform burning of the steel billet is ensured;
(6) a heating procedure: in the stage II, the initial rolling temperature is 900 ℃, the final rolling temperature is 790 ℃, and the water cooling and red returning temperature is 700 ℃;
(7) a heat treatment process: normalizing at 880 deg.C, keeping the temperature coefficient at 3.5min/mm, keeping the temperature for 63min, and cooling rapidly.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Example 2
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 26mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 925 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1620 ℃, and the tapping C: 0.08 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the white slag refining time is 36min, the total LF refining time is 65min, the consumption of aluminum wires is 4.5 kg/t steel, the consumption of lime is 18 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.7 kg/t steel, the aluminum content in the process is 0.018%, the slagging aluminum is 0.023%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 38Pa, the vacuum maintaining time is 26min, 2.4 kg of Ca-Fe wire is added before vacuum per t of steel, argon can not be blown greatly during vacuum pumping, the argon flow is 305L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1517 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1220 ℃, the heat preservation time of the soaking section is 70min, the heating time coefficient is 13min/cm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the initial rolling temperature of the stage II is 910 ℃, the final rolling temperature is 810 ℃, and the water cooling temperature of the rolling furnace is 710 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 895 ℃, keeping the heat preservation coefficient at 2.5min/mm, keeping the temperature for 65min, and accelerating cooling.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Example 3
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 32mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 920 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1618 ℃, and the tapping temperature is as follows: 0.07 percent;
(2) an LF refining procedure: good argon blowing is guaranteed in the whole process, the maintaining time of refined white slag is 33min, the total time of LF refining is 55min, the consumption of aluminum wires is 3.3 kg/t steel, the consumption of lime is 22 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.6 kg/t steel, the aluminum content in the process is 0.015%, the slagging-off aluminum is 0.020%, and the refining is finished S: 0.004%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 30min, 1.8 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 300L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1521 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1230 ℃, the heat preservation time of the soaking section is 80min, the heating time coefficient is 15min/cm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the beginning rolling temperature of the stage II is 885 ℃, the finishing rolling temperature is 790 ℃, and the water cooling and red returning temperature is 685 ℃;
(7) a heat treatment process: normalizing at 900 deg.C, keeping the temperature coefficient at 2.5min/mm, keeping the temperature for 80min, and accelerating cooling.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Example 4
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 40mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 925 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1609 ℃, and the tapping temperature is C: 0.06 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the refining white slag keeping time is 38min, the LF refining total time is 60min, the consumption of aluminum wires is 3.8 kg/t steel, the consumption of lime is 22 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.7 kg/t steel, the aluminum content in the process is 0.020%, the slagging aluminum is 0.026%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 38Pa, the vacuum maintaining time is 25min, 2.0 kg of Ca-Fe wire is added before vacuum per t of steel, argon can not be blown greatly during vacuum pumping, the argon flow is 270L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 300mm, and the liquidus temperature is 1545 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1230 ℃, the heat preservation time of the soaking section is 70min, the heating time coefficient is 13min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the second stage is that the initial rolling temperature is 890 ℃, the final rolling temperature is 810 ℃, and the water cooling temperature is 715 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 895 ℃, keeping the heat preservation coefficient at 1.6min/mm, keeping the temperature for 64min, and accelerating cooling.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Example 5
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 55mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 930 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1628 ℃, and the tapping C: 0.07 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the white slag refining time is 36min, the total LF refining time is 70min, the consumption of aluminum wires is 3.2 kg/t steel, the consumption of lime is 20 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.8 kg/t steel, the aluminum content in the process is 0.018%, the slagging aluminum is 0.025%, and the refining is finished S: 0.004%;
(3) VD vacuum refining: the vacuum degree is 38Pa, the vacuum maintaining time is 28min, 1.8 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 310L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1532 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1230 ℃, the heat preservation time of the soaking section is 70min, the heating time coefficient is 12min/cm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: in the stage II, the initial rolling temperature is 900 ℃, the final rolling temperature is 790 ℃, and the water-cooling re-reddening temperature is 705 ℃;
(7) a heat treatment process: normalizing at 900 deg.C, keeping the temperature coefficient at 1.8min/mm, keeping the temperature for 99min, and accelerating cooling.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Example 6
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 64mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 925 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1633 ℃, and the tapping temperature is as follows: 0.05 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 34min, the total time of LF refining is 63min, the consumption of aluminum wires is 2.7 kg/t steel, the consumption of lime is 23 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.9 kg/t steel, the aluminum content in the process is 0.020%, the slagging aluminum is 0.023%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 36Pa, the vacuum maintaining time is 28min, 2.5 kg of Ca-Fe wire is added before vacuum per t of steel, argon can not be blown greatly during vacuum pumping, the argon flow is 295L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1518 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1225 ℃, the heat preservation time of the soaking section is 75min, the heating time coefficient is 15min/cm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the initial rolling temperature of stage II is 910 ℃, the final rolling temperature is 880 ℃, and the water cooling temperature is 710 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 900 ℃, keeping the temperature coefficient at 2min/mm, keeping the temperature for 128min, and accelerating cooling.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Example 7
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 75mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 905 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1609 ℃, and the tapping temperature is C: 0.08 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 35min, the total time of LF refining is 65min, the consumption of aluminum wires is 2.6 kg/t steel, the consumption of lime is 22 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.7 kg/t steel, the aluminum content in the process is 0.016%, the slagging aluminum is 0.021%, and the refining is finished S: 0.005 percent;
(3) VD vacuum refining: the vacuum degree is 38Pa, the vacuum maintaining time is 32min, 1.8 kg of Ca-Fe wire is added before vacuum per t of steel, argon can not be blown greatly during vacuum pumping, the argon flow is 260L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 300mm, and the liquidus temperature is 1522 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1240 ℃, the heat preservation time of the soaking section is 80min, the heating time coefficient is 12.5min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the second stage is that the initial rolling temperature is 890 ℃, the final rolling temperature is 800 ℃, and the water cooling and red returning temperature is 690 ℃;
(7) a heat treatment process: normalizing at 900 deg.C, keeping the temperature coefficient at 2.3min/mm, keeping the temperature for 173min, and accelerating cooling.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Example 8
The thickness of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment is 80mm, and the chemical composition and the mass percentage of the chemical composition are shown in Table 1.
The production method of the low-alloy low-carbon equivalent steel plate SA516Gr60 comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and comprises the following specific process steps:
(1) smelting: the steel ladle is well baked, and the baking temperature is 935 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1625 ℃, and the tapping C: 0.09%;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 36min, the total time of LF refining is 60min, the consumption of aluminum wires is 5.0 kg/t steel, the consumption of lime is 19 kg/t steel, the consumption of deoxidizer ferrosilicon is 3.5 kg/t steel, the aluminum content in the process is 0.016%, the slagging-off aluminum is 0.023%, and the refining is finished S: 0.004%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 27min, 2.1 kg of Ca-Fe wire is added before vacuum per t of steel, argon can not be blown greatly during vacuum pumping, the argon flow is 320L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 330mm, and the liquidus temperature is 1535 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1240 ℃, the heat preservation time of the soaking section is 65min, the heating time coefficient is 14min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the second stage is that the initial rolling temperature is 910 ℃, the final rolling temperature is 870 ℃, and the water cooling temperature is 680 ℃;
(7) a heat treatment process: normalizing at 900 deg.C, keeping the temperature coefficient at 4min/mm, keeping the temperature for 280min, and accelerating cooling.
The delivery state performance indexes of the low-alloy low-carbon equivalent steel plate SA516Gr60 of the embodiment are shown in Table 2.
Table 1 chemical composition and mass% of steel sheets of examples 1 to 8
Figure DEST_PATH_IMAGE002
Note: the balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 examples 1-8 steel sheet delivery Performance index
Figure DEST_PATH_IMAGE004
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (9)

1. The low-alloy low-carbon equivalent steel plate is characterized by comprising the following chemical components in percentage by mass: c is less than or equal to 0.20 percent, Si: 0.15 to 0.40%, Mn: 0.85-1.20 percent of Fe, less than or equal to 0.01 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.020 percent of Nb, and the balance of Fe and inevitable impurities.
2. The low-alloy low-carbon equivalent steel plate according to claim 1, wherein the thickness of the steel plate is 8-80 mm, and the CE of the steel plate is less than or equal to 0.35%.
3. The low-alloy low-carbon equivalent section steel plate according to claim 1, wherein the steel plate has a delivery state-46 ℃ transverse impact mean value of not less than 100J; the steel plate delivery state performance: the yield strength is more than or equal to 220MPa, the tensile strength is 415-550 MPa, and the elongation is more than or equal to 25%.
4. A method for producing a low-alloy, low-carbon equivalent steel sheet according to any one of claims 1 to 3, wherein the method comprises the steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling, and heat treatment; in the heat treatment process, the normalizing heat preservation temperature is 880-900 ℃, the heat preservation coefficient is 1.5-4 min/mm, the heat preservation time is not less than 60min, and the cooling is accelerated.
5. The production method of the low-alloy low-carbon equivalent type steel plate as claimed in claim 4, wherein the LF refining process ensures good argon blowing throughout the process, the maintaining time of refined white slag is more than or equal to 30min, the total LF refining time is more than or equal to 50min, the consumption of aluminum wires is 2.5 to 5 kg/t of steel, the consumption of lime is more than or equal to 18 kg/t of steel, the consumption of deoxidizer ferrosilicon is more than or equal to 2.5 kg/t of steel, the aluminum content in the process is more than or equal to 0.015%, the drossing aluminum is more than or equal to 0.020%, and the S after refining is less than or equal to 0..
6. The production method of a low-alloy low-carbon equivalent type steel plate according to claim 4, characterized in that in the VD vacuum refining process, the vacuum degree is less than or equal to 40Pa, the vacuum maintaining time is more than or equal to 25min, 1 to 2.5 kg of Ca-Fe wires per ton of steel are added before vacuum, argon cannot be blown greatly during vacuum pumping, the argon flow is 260 to 320L/min, and Al wires are not allowed to be fed after vacuum pumping.
7. The method for producing the low-alloy low-carbon equivalent steel plate according to claim 4, wherein the continuous casting process is carried out at a liquidus temperature of 1515-1535 ℃ and a continuous casting billet thickness of 200-330 mm.
8. The method for producing the low-alloy low-carbon equivalent steel plate according to claim 4, wherein in the heating process, the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1220-1240 ℃, the holding time of the soaking section is not less than 60min, the heating time coefficient is not less than 10min/mm, and the thorough burning and uniformity of the steel billet are ensured.
9. The method for producing the low-alloy low-carbon equivalent steel plate as claimed in claim 4, wherein the heating step is performed at a rolling start temperature of 880-910 ℃, a finishing temperature of 780-880 ℃, and a water-cooling re-reddening temperature of 680-720 ℃.
CN202011011542.0A 2020-09-23 2020-09-23 Low-alloy low-carbon equivalent steel plate and production method thereof Pending CN112375963A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013204044A (en) * 2012-03-27 2013-10-07 Nippon Steel & Sumikin Stainless Steel Corp Duplex stainless steel with high weldability
CN105886909A (en) * 2016-04-19 2016-08-24 江阴兴澄特种钢铁有限公司 Pressure container steel plate resistant to hydrogen induced cracking and manufacturing method thereof
CN107245652A (en) * 2017-05-23 2017-10-13 舞阳钢铁有限责任公司 The big high die welding performance SA516Gr60 steel plates of thickness and its production method
CN108251748A (en) * 2018-03-28 2018-07-06 舞阳钢铁有限责任公司 A kind of low-carbon-equivalent Nuclear containment steel plate and its production method
CN111020351A (en) * 2019-12-12 2020-04-17 舞阳钢铁有限责任公司 Low-carbon steel plate with excellent low-temperature impact toughness and welding performance and production method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013204044A (en) * 2012-03-27 2013-10-07 Nippon Steel & Sumikin Stainless Steel Corp Duplex stainless steel with high weldability
CN105886909A (en) * 2016-04-19 2016-08-24 江阴兴澄特种钢铁有限公司 Pressure container steel plate resistant to hydrogen induced cracking and manufacturing method thereof
CN107245652A (en) * 2017-05-23 2017-10-13 舞阳钢铁有限责任公司 The big high die welding performance SA516Gr60 steel plates of thickness and its production method
CN108251748A (en) * 2018-03-28 2018-07-06 舞阳钢铁有限责任公司 A kind of low-carbon-equivalent Nuclear containment steel plate and its production method
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Application publication date: 20210219