CN108251748A - A kind of low-carbon-equivalent Nuclear containment steel plate and its production method - Google Patents

A kind of low-carbon-equivalent Nuclear containment steel plate and its production method Download PDF

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Publication number
CN108251748A
CN108251748A CN201810263309.8A CN201810263309A CN108251748A CN 108251748 A CN108251748 A CN 108251748A CN 201810263309 A CN201810263309 A CN 201810263309A CN 108251748 A CN108251748 A CN 108251748A
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steel plate
carbon
low
temperature
equivalent
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邓建军
李建朝
李�杰
龙杰
石莉
林明新
刘生
程含文
牛晓晖
谢东
张萌
刘印子
张海军
李劲锋
肖雄峰
管秀兵
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Wuyang Iron and Steel Co Ltd
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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
    • 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • 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
    • 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
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Abstract

The invention discloses a kind of low-carbon-equivalent Nuclear containment steel plate and its production method, steel plate chemical composition composition and its mass percentage are:C:0.09~0.13%, Si:0.25~0.40%, Mn:1.00~1.35%, P≤0.010%, S≤0.005%, Cr:0.15~0.30%, Ni:0.15~0.35%, Mo:0.15~0.25%, Cu≤0.10%, Nb:0.020~0.040%, V≤0.010%, Alt >=0.020%, surplus be Fe and inevitable impurity, carbon equivalent ce V≤0.42%;Production method includes smelting, heating steel billet, billet rolling, steel plate heat treatment procedure.Steel plate of the present invention meets room temperature stretching, drawing by high temperature and the low temperature impact properties of the condition of delivery and Simulated post-weld heat treatment state simultaneously, can be widely used for domestic and international nuclear power projects.

Description

A kind of low-carbon-equivalent Nuclear containment steel plate and its production method
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of low-carbon-equivalent Nuclear containment steel plate and its producer Method.
Background technology
Nuclear containment is the landmark of nuclear power station, and all devices of nuclear steam supply system are respectively mounted in it.Core Containment is the patron saint of nuclear power station, and the safety and reliability requirement of wherein lining steel plate is very strict, it is desirable that yield strength, Tensile strength is high;Low-temperature flexibility is good;There is good high temperature resistance;In addition, Nuclear containment is welded after need to being deformed with steel plate, Therefore good solderability and hot and cold processing performance are also critically important.
With the rapid emergence of current China's nuclear power station, nuclear power station designs more and more stringenter, the requirement to midium-carbon steel plate Also it is higher and higher, for core position containment with steel plate more very, be mainly manifested in solderability requirement improve, also need to ensure simultaneously Higher obdurability under the condition of delivery and die welding state.Relatively low composition design is to ensure the necessary item of steel plate good welds Part, but this will certainly reduce the performance after the mechanical property of steel plate, especially Simulated post-weld heat treatment and more be difficult to ensure that.This hair Bright low-carbon-equivalent Nuclear containment steel plate and its production method under the premise of steel plate good welds are ensured, can be obtained effectively Two sets of performances of the condition of delivery and Simulated post-weld heat treatment state, have preferably adapted to the demand in nuclear power steel plate market.
Invention content
The technical problem to be solved in the present invention is to provide a kind of low-carbon-equivalent Nuclear containment steel plate and its production methods;This The low-carbon-equivalent Nuclear containment of invention ensures two sets of performances of the condition of delivery and Simulated post-weld heat treatment state with steel plate.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:A kind of low-carbon-equivalent Nuclear containment steel plate, The steel plate chemical composition composition and its mass percentage are:C:0.09~0.13%, Si:0.25~0.40%, Mn:1.00~ 1.35%, P≤0.010%, S≤0.005%, Cr:0.15~0.30%, Ni:0.15~0.35%, Mo:0.15~0.25%, Cu≤ 0.10%, Nb:0.020~0.040%, V≤0.010%, Alt >=0.020%, surplus are Fe and inevitable impurity.
Steel plate carbon equivalent ce V≤0.42% of the present invention, wherein carbon equivalent calculation formula are CEV(%)=C+Mn/6+(Cr+ Mo+V)/5+(Ni+Cu)/15。
Steel plate thickness specification of the present invention is 20~45mm.
The steel plate condition of delivery of the present invention and Simulated post-weld heat treatment condition mechanical performance are satisfied by:Room temperature stretches Rp0.2 >=415MPa, Rm:585~705MPa, A50 >=20.0%;200 DEG C of drawing by high temperature Rp0.2>=345MPa, Rm >=525MPa;-45℃ Side knock work(AKV average values >=54J.
The present invention also provides a kind of production method of low-carbon-equivalent Nuclear containment steel plate, the production method includes smelting Refining, heating steel billet, billet rolling, steel plate heat treatment procedure;The billet rolling process, using II type controlled rolling technique;Institute Steel plate heat treatment procedure is stated, using quenching+tempering technique twice.
Smelting procedure of the present invention takes electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, white slag is protected It holds the time >=30 minutes, total refining time >=50 minute, and should ensure that whole Argon is good;During VD vacuum processings, vacuum degree ≤ 66Pa, vacuum retention time >=20 minute.
Heating steel billet process of the present invention, total heating time >=8min/cm during heating steel billet, maximum heating temperature≤ 1260 DEG C, soaking temperature >=1220 DEG C.
Billet rolling process of the present invention, I 1050~1100 DEG C of stage start rolling temperature rob warm-rolling system, and finishing temperature >= 960 DEG C, I stage passage is averaged reduction ratio >=7%;II stage start rolling temperature≤950 DEG C, finishing temperature≤900 DEG C.
Steel plate heat treatment procedure of the present invention, primary quenching are heated to 910~930 DEG C, soaking time >=2min/mm, Maximum amount of water is cooled to room temperature after coming out of the stove;Secondary quenching, quickly heats up to 910~930 DEG C again, and soaking time >=2min/mm goes out Maximum amount of water is cooled to room temperature after stove.
Steel plate heat treatment procedure of the present invention, tempering are heated to 650~670 DEG C, and 4~6min/mm of soaking time comes out of the stove It is air-cooled afterwards.
Steel plate Simulated post-weld heat treatment process of the present invention, 425 DEG C take on stove, 425 DEG C or more temperature rates:56 ℃/h≤220/T*25.4≤220℃/h(T is steel plate thickness;If temperature rate in terms of 220 DEG C/h, rises more than 220 DEG C/h If rate of temperature fall is less than 56 DEG C/h, in terms of 56 DEG C/h), 620~630 DEG C of holding temperature, soaking time:15h is air-cooled to after coming out of the stove Room temperature state.
Low-carbon-equivalent Nuclear containment of the present invention steel sheet product canonical reference ASME SA-738/SA-738M, properties of product Detection method refers to ASME SA-370/SA-370M.
It is using advantageous effect caused by above-mentioned technical proposal:1st, the present invention is formed multiple by Mn, Cr alloying element It closes and strengthens, add a small amount of Ni alloys and improve matrix toughness, add a small amount of Mo alloys and ensure elevated temperature strength, add micro Nb alloys simultaneously Cooperation controlled rolling technology makes steel plate crystal grain uniformly tiny.2nd, the present invention uses the heat treatment process of quenching+tempering twice, repeatedly Heating quenching can make austenite grain obtain a degree of refinement.3rd, it is more and more severe with steel plate present invention accomplishes nuclear power projects The requirement at quarter, under the premise of good welds are ensured, steel plate meets two sets of property of the condition of delivery and Simulated post-weld heat treatment state Energy.4th, the steel plate condition of delivery of the present invention and Simulated post-weld heat treatment condition mechanical performance are satisfied by:Room temperature stretches Rp0.2≥ 415MPa, Rm:585~705MPa, A50 >=20.0%;200 DEG C of drawing by high temperature Rp0.2>=345MPa, Rm >=525MPa;- 45 DEG C of horizontal strokes To ballistic work AKV average values >=54J.5th, the present invention is by rational composition design and controlling of production process, compared with low-carbon-equivalent Under the premise of, steel plate is made to obtain the matching of good obdurability, and meet the condition of delivery and Simulated post-weld heat treatment state simultaneously Room temperature stretching, drawing by high temperature and low temperature impact properties, can be widely used for domestic and international nuclear power projects.
Specific embodiment
The present invention is described in more detail with reference to specific embodiment.
Embodiment 1
The present embodiment low-carbon-equivalent Nuclear containment is 20mm with steel plate thickness, and chemical composition composition and mass percentage are: C:0.10%, Si:0.25%, Mn:1.27%, P:0.005%, S:0.002%, Cr:0.19%, Ni:0.24%, Cu:0.080%, Mo: 0.21%, Nb:0.020%, V:0.003%, Alt:0.028%, surplus be Fe and inevitable impurity, carbon equivalent ce V=0.41%.
The present embodiment low-carbon-equivalent Nuclear containment includes smelting, heating steel billet, billet rolling, steel plate with Plate Production method Heat treatment procedure, specific process step are as described below:
(1)It smelts:Take electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, 34 minutes white slag retention times, always Refining time 58 minutes, whole Argon is good;During VD vacuum processings, vacuum degree 66Pa, 25 minutes vacuum retention times;
(2)Heating steel billet:Total heating time 11min/cm during heating steel billet, 1255 DEG C of maximum heating temperature, soaking temperature 1240 ℃;
(3)Billet rolling:Using II type controlled rolling, I 1087 DEG C of stage start rolling temperature, point 5 passages roll into 80mm plates from 200mm slabs Base, passage are averaged reduction ratio as 12%, 981 DEG C of finishing temperature;II 878 DEG C of stage start rolling temperature, 817 DEG C of finish to gauge temperature obtain thickness The steel plate of 20mm;
(4)Steel plate is heat-treated:Using the heat treatment process of quenching+tempering twice;Primary quenching is heated to 920 DEG C, soaking time 3min/mm, maximum amount of water is cooled to room temperature after coming out of the stove;Secondary quenching quickly heats up to 920 DEG C, soaking time 3min/mm again, Maximum amount of water is cooled to room temperature after coming out of the stove;Tempering is heated to 660 DEG C, soaking time 6min/mm, air-cooled after coming out of the stove.
The present embodiment steel plate Simulated post-weld heat treatment technique is:Take on 425 DEG C of furnace temperature, 620 DEG C of holding temperature, during heat preservation Between for 15h, warming and cooling rate is 220 DEG C/h.
The present embodiment 20mm thickness low-carbon-equivalent Nuclear containment the steel plate condition of delivery and the reason of Simulated post-weld heat treatment state Change service check and the results are shown in Table 1.
The mechanical property of 1 embodiment of table, 1 low-carbon-equivalent Nuclear containment steel plate
Embodiment 2
The present embodiment low-carbon-equivalent Nuclear containment is 38mm with steel plate thickness, and chemical composition composition and mass percentage are: C:0.09%, Si:0.29%, Mn:1.28%, P:0.006%, S:0.002%, Cr:0.17%, Ni:0.28%, Cu:0.070%, Mo: 0.25%, Nb:0.030%, V:0.007%, Alt:0.037%, surplus be Fe and inevitable impurity, carbon equivalent ce V=0.41%.
The present embodiment low-carbon-equivalent Nuclear containment includes smelting, heating steel billet, billet rolling, steel plate with Plate Production method Heat treatment procedure, specific process step are as described below:
(1)It smelts:Take electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, 30 minutes white slag retention times, always Refining time 55 minutes, whole Argon is good;During VD vacuum processings, vacuum degree 60Pa, 23 minutes vacuum retention times;
(2)Heating steel billet:Total heating time 11min/cm during heating steel billet, 1250 DEG C of maximum heating temperature, soaking temperature 1230 ℃;
(3)Billet rolling:Using II type controlled rolling, I 1092 DEG C of stage start rolling temperature, point 5 passages roll into 90mm plates from 200mm slabs Base, passage are averaged reduction ratio as 11%, 998 DEG C of finishing temperature;II 890 DEG C of stage start rolling temperature, 824 DEG C of finish to gauge temperature obtain thickness The steel plate of 38mm;
(4)Steel plate is heat-treated:Using the heat treatment process of quenching+tempering twice;Primary quenching is heated to 920 DEG C, soaking time 2.2min/mm, maximum amount of water is cooled to room temperature after coming out of the stove;Secondary quenching quickly heats up to 920 DEG C, soaking time 2.2min/ again Mm, maximum amount of water is cooled to room temperature after coming out of the stove;Tempering is heated to 650 DEG C, soaking time 4.5min/mm, air-cooled after coming out of the stove.
The present embodiment steel plate Simulated post-weld heat treatment technique is:Take on 425 DEG C of furnace temperature, 625 DEG C of holding temperature, during heat preservation Between for 15h, warming and cooling rate is 147 DEG C/h.
The present embodiment 38mm thickness low-carbon-equivalent Nuclear containment the steel plate condition of delivery and the reason of Simulated post-weld heat treatment state Change service check and the results are shown in Table 2.
The mechanical property of 2 embodiment of table, 2 low-carbon-equivalent Nuclear containment steel plate
Embodiment 3
The present embodiment low-carbon-equivalent Nuclear containment is 45mm with steel plate thickness, and chemical composition composition and mass percentage are: C:0.10%, Si:0.34%, Mn:1.35%, P:0.006%, S:0.005%, Cr:0.20%, Ni:0.19%, Cu:0.060%, Mo: 0.15%, Nb:0.036%, V:0.002%, Alt:0.042%, surplus be Fe and inevitable impurity, carbon equivalent ce V=0.41%.
The present embodiment low-carbon-equivalent Nuclear containment includes smelting, heating steel billet, billet rolling, steel plate with Plate Production method Heat treatment procedure, specific process step are as described below:
(1)It smelts:Take electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, 35 minutes white slag retention times, always Refining time 57 minutes, whole Argon is good;During VD vacuum processings, vacuum degree 63Pa, 25 minutes vacuum retention times;
(2)Heating steel billet:Total heating time 10min/cm during heating steel billet, 1260 DEG C of maximum heating temperature, soaking temperature 1240 ℃;
(3)Billet rolling:Using II type controlled rolling, I 1098 DEG C of stage start rolling temperature, point 8 passages roll into 130mm from 300mm slabs Slab, passage are averaged reduction ratio as 7%, 960 DEG C of finishing temperature;II 897 DEG C of stage start rolling temperature, 814 DEG C of finish to gauge temperature obtain thickness The steel plate of 45mm;
(4)Steel plate is heat-treated:Using the heat treatment process of quenching+tempering twice;Primary quenching is heated to 920 DEG C, soaking time 2min/mm, maximum amount of water is cooled to room temperature after coming out of the stove;Secondary quenching quickly heats up to 920 DEG C, soaking time 2min/mm again, Maximum amount of water is cooled to room temperature after coming out of the stove;Tempering is heated to 650 DEG C, soaking time 4min/mm, air-cooled after coming out of the stove.
The present embodiment steel plate Simulated post-weld heat treatment technique is:Take on 425 DEG C of furnace temperature, 630 DEG C of holding temperature, during heat preservation Between for 15h, warming and cooling rate is 124 DEG C/h.
The present embodiment 45mm thickness low-carbon-equivalent Nuclear containment the steel plate condition of delivery and the reason of Simulated post-weld heat treatment state Change service check and the results are shown in Table 3.
The mechanical property of 3 embodiment of table, 3 low-carbon-equivalent Nuclear containment steel plate
Embodiment 4
The present embodiment low-carbon-equivalent Nuclear containment is 30mm with steel plate thickness, and chemical composition composition and mass percentage are: C:0.13%, Si:0.30%, Mn:1.00%, P:0.010%, S:0.004%, Cr:0.30%, Ni:0.25%, Cu:0.09%, Mo: 0.20%, Nb:0.025%, V:0.003, Alt:0.020%, surplus be Fe and inevitable impurity, carbon equivalent ce V=0.42%.
The present embodiment low-carbon-equivalent Nuclear containment includes smelting, heating steel billet, billet rolling, steel plate with Plate Production method Heat treatment procedure, specific process step are as described below:
(1)It smelts:Take electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, 35 minutes white slag retention times, always Refining time 50 minutes, whole Argon is good;During VD vacuum processings, vacuum degree 65Pa, 20 minutes vacuum retention times;
(2)Heating steel billet:Total heating time 8min/cm during heating steel billet, 1245 DEG C of maximum heating temperature, soaking temperature 1220 ℃;
(3)Billet rolling:Using II type controlled rolling, I 1050 DEG C of stage start rolling temperature, point 5 passages roll into 80mm plates from 200mm slabs Base, passage are averaged reduction ratio as 12%, 973 DEG C of finishing temperature;II 950 DEG C of stage start rolling temperature, 900 DEG C of finishing temperature obtain thickness The steel plate of 30mm;
(4)Steel plate is heat-treated:Using the heat treatment process of quenching+tempering twice;Primary quenching is heated to 910 DEG C, soaking time 2.5min/mm, maximum amount of water is cooled to room temperature after coming out of the stove;Secondary quenching quickly heats up to 910 DEG C, soaking time 2.5min/ again Mm, maximum amount of water is cooled to room temperature after coming out of the stove;Tempering is heated to 670 DEG C, soaking time 5min/mm, air-cooled after coming out of the stove.
The present embodiment steel plate Simulated post-weld heat treatment technique is:Take on 425 DEG C of furnace temperature, 620 DEG C of holding temperature, during heat preservation Between for 15h, warming and cooling rate is 186 DEG C/h.
The present embodiment 30mm thickness low-carbon-equivalent Nuclear containment the steel plate condition of delivery and the reason of Simulated post-weld heat treatment state Change service check and the results are shown in Table 4.
The mechanical property of 4 embodiment of table, 4 low-carbon-equivalent Nuclear containment steel plate
Embodiment 5
The present embodiment low-carbon-equivalent Nuclear containment is 25mm with steel plate thickness, and chemical composition composition and mass percentage are: C:0.11%, Si:0.40%, Mn:1.16%, P:0.008%, S:0.003%, Cr:0.15%, Ni:0.35%, Cu:0.10%, Mo: 0.18%, Nb:0.028%, V:0.010%, Alt:0.030%, surplus be Fe and inevitable impurity, carbon equivalent ce V=0.40%.
The present embodiment low-carbon-equivalent Nuclear containment includes smelting, heating steel billet, billet rolling, steel plate with Plate Production method Heat treatment procedure, specific process step are as described below:
(1)It smelts:Take electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, 32 minutes white slag retention times, always Refining time 55 minutes, whole Argon is good;During VD vacuum processings, vacuum degree 66Pa, 25 minutes vacuum retention times;
(2)Heating steel billet:Total heating time 9min/cm during heating steel billet, 1260 DEG C of maximum heating temperature, soaking temperature 1250 ℃;
(3)Billet rolling:Using II type controlled rolling, I 1100 DEG C of stage start rolling temperature, point 6 passages roll into 80mm plates from 200mm slabs Base, passage are averaged reduction ratio as 10%, 985 DEG C of finishing temperature;II 935 DEG C of stage start rolling temperature, 895 DEG C of finish to gauge temperature obtain thickness The steel plate of 25mm;
(4)Steel plate is heat-treated:Using the heat treatment process of quenching+tempering twice;Primary quenching is heated to 930 DEG C, soaking time 3min/mm, maximum amount of water is cooled to room temperature after coming out of the stove;Secondary quenching quickly heats up to 930 DEG C, soaking time 3min/mm again, Maximum amount of water is cooled to room temperature after coming out of the stove;Tempering is heated to 660 DEG C, soaking time 5.5min/mm, air-cooled after coming out of the stove.
The present embodiment steel plate Simulated post-weld heat treatment technique is:Take on 425 DEG C of furnace temperature, 620 DEG C of holding temperature, during heat preservation Between for 15h, warming and cooling rate is 220 DEG C/h.
The present embodiment 25mm thickness low-carbon-equivalent Nuclear containment the steel plate condition of delivery and the reason of Simulated post-weld heat treatment state Change service check and the results are shown in Table 5.
The mechanical property of 5 embodiment of table, 5 low-carbon-equivalent Nuclear containment steel plate
Embodiment 6
The present embodiment low-carbon-equivalent Nuclear containment is 40mm with steel plate thickness, and chemical composition composition and mass percentage are: C:0.13%, Si:0.32%, Mn:1.08%, P:0.007%, S:0.002%, Cr:0.24%, Ni:0.15%, Cu:0.03%, Mo: 0.23%, Nb:0.040%, V:0.005%, Alt:0.035%, surplus be Fe and inevitable impurity, carbon equivalent ce V=0.42%.
The present embodiment low-carbon-equivalent Nuclear containment includes smelting, heating steel billet, billet rolling, steel plate with Plate Production method Heat treatment procedure, specific process step are as described below:
(1)It smelts:Take electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, 30 minutes white slag retention times, always Refining time 55 minutes, whole Argon is good;During VD vacuum processings, vacuum degree 60Pa, 20 minutes vacuum retention times;
(2)Heating steel billet:Total heating time 12min/cm during heating steel billet, 1250 DEG C of maximum heating temperature, soaking temperature 1235 ℃;
(3)Billet rolling:Using II type controlled rolling, I 1056 DEG C of stage start rolling temperature, point 7 passages roll into 130mm from 300mm slabs Slab, passage are averaged reduction ratio as 8%, 960 DEG C of finishing temperature;II 935 DEG C of stage start rolling temperature, 875 DEG C of finish to gauge temperature obtain thickness The steel plate of 40mm;
(4)Steel plate is heat-treated:Using the heat treatment process of quenching+tempering twice;Primary quenching is heated to 925 DEG C, soaking time 2.8min/mm, maximum amount of water is cooled to room temperature after coming out of the stove;Secondary quenching quickly heats up to 925 DEG C, soaking time 2.8min/ again Mm, maximum amount of water is cooled to room temperature after coming out of the stove;Tempering is heated to 655 DEG C, soaking time 5.5min/mm, air-cooled after coming out of the stove.
The present embodiment steel plate Simulated post-weld heat treatment technique is:Take on 425 DEG C of furnace temperature, 625 DEG C of holding temperature, during heat preservation Between for 15h, warming and cooling rate is 139 DEG C/h.
The present embodiment 40mm thickness low-carbon-equivalent Nuclear containment the steel plate condition of delivery and the reason of Simulated post-weld heat treatment state Change service check and the results are shown in Table 6.
The mechanical property of 6 embodiment of table, 6 low-carbon-equivalent Nuclear containment steel plate
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to the present invention into Go detailed description, it will be understood by those of ordinary skill in the art that:Still it can modify to the present invention or equally replace It changes, without departing from the spirit or scope of the invention, or any substitutions, the right that should all cover in the present invention is wanted It asks in range.

Claims (10)

1. a kind of low-carbon-equivalent Nuclear containment steel plate, which is characterized in that the steel plate chemical composition composition and its quality percentage Content is:C:0.09~0.13%, Si:0.25~0.40%, Mn:1.00~1.35%, P≤0.010%, S≤0.005%, Cr: 0.15~0.30%, Ni:0.15~0.35%, Mo:0.15~0.25%, Cu≤0.10%, Nb:0.020~0.040%, V≤ 0.010%, Alt >=0.020%, surplus are Fe and inevitable impurity.
A kind of 2. low-carbon-equivalent Nuclear containment steel plate according to claim 1, which is characterized in that the steel plate carbon equivalent CEV≤0.42%。
A kind of 3. low-carbon-equivalent Nuclear containment steel plate according to claim 1, which is characterized in that the steel plate thickness rule Lattice are 20~45mm.
A kind of 4. low-carbon-equivalent Nuclear containment steel plate according to claim 1, which is characterized in that the steel plate delivery shape State and Simulated post-weld heat treatment condition mechanical performance are satisfied by:Room temperature stretches Rp0.2>=415MPa, Rm:585~705MPa, A50 ≥20.0%;200 DEG C of drawing by high temperature Rp0.2>=345MPa, Rm >=525MPa;- 45 DEG C of side knock work(AKV average values >=54J.
5. a kind of production method of low-carbon-equivalent Nuclear containment steel plate described in based on claim 1-4 any one, special Sign is that the production method includes smelting, heating steel billet, billet rolling, steel plate heat treatment procedure;The billet rolling work Sequence, using II type controlled rolling technique;The steel plate heat treatment procedure, using quenching+tempering technique twice.
6. the production method of a kind of low-carbon-equivalent Nuclear containment steel plate according to claim 5, which is characterized in that described Steel plate heat treatment procedure, primary quenching are heated to 910~930 DEG C, and soaking time >=2min/mm, maximum amount of water is cooled to after coming out of the stove Room temperature;Secondary quenching quickly heats up to 910~930 DEG C again, and soaking time >=2min/mm, maximum amount of water is cooled to after coming out of the stove Room temperature.
7. the production method of a kind of low-carbon-equivalent Nuclear containment steel plate according to claim 5, which is characterized in that described Steel plate heat treatment procedure, tempering are heated to 650~670 DEG C, soaking time 4~6min/mm, air-cooled after coming out of the stove.
8. a kind of production method of low-carbon-equivalent Nuclear containment steel plate according to claim 5-7 any one, special Sign is that the smelting procedure takes electric furnace smelting+LF stove refining+VD vacuum processings;When LF stoves refine, the white slag retention time >=30 minutes, total refining time >=50 minute, and should ensure that whole Argon is good;During VD vacuum processings, vacuum degree≤66Pa, Vacuum retention time >=20 minute.
9. a kind of production method of low-carbon-equivalent Nuclear containment steel plate according to claim 5-7 any one, special Sign is, the heating steel billet process, total heating time >=8min/cm during heating steel billet, maximum heating temperature≤1260 DEG C, Hot temperature >=1220 DEG C.
10. a kind of production method of low-carbon-equivalent Nuclear containment steel plate according to claim 5-7 any one, special Sign is, the billet rolling process, I 1050~1100 DEG C of stage start rolling temperature, robs warm-rolling system, finishing temperature >=960 DEG C, I Stage passage is averaged reduction ratio >=7%;II stage start rolling temperature≤950 DEG C, finishing temperature≤900 DEG C.
CN201810263309.8A 2018-03-28 2018-03-28 A kind of low-carbon-equivalent Nuclear containment steel plate and its production method Pending CN108251748A (en)

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