CN102345066B - Steel used for pressure container and preparation method thereof - Google Patents

Steel used for pressure container and preparation method thereof Download PDF

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Publication number
CN102345066B
CN102345066B CN 201110322261 CN201110322261A CN102345066B CN 102345066 B CN102345066 B CN 102345066B CN 201110322261 CN201110322261 CN 201110322261 CN 201110322261 A CN201110322261 A CN 201110322261A CN 102345066 B CN102345066 B CN 102345066B
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steel
rolling
temperature
refining
iron
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CN102345066A (en
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李文钱
周平
麻衡
王博
吴会亮
李辉
王月香
李灿明
刘军刚
李生根
任继银
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LAIGANG GROUP YINSHAN SHAPED STEEL Co.,Ltd.
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Laiwu Iron and Steel Group Co Ltd
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Abstract

The invention provides steel used for a pressure container and a preparation method thereof. The steel comprises the following components in percentage by weight: 0.06-0.10% of C, 0.20-0.40% of Si, 1.40-1.55% of Mn, 0.4-0.6% of Ni, not more than 0.015% of P, not more than 0.004% of S, 0.025-0.040% of Nb, 0.020-0.050% of Ti, 0.020-0.055% of Alt and the balance of Fe and inevitable impurities. The steel prepared by the invention has excellent Z property, therefore, a low-temperature pressure container with improved reliability can be manufactured.

Description

A kind of steel for pressurized vessel and preparation method thereof
Technical field
The present invention relates to a kind of steel for pressurized vessel and preparation method thereof, specifically, the present invention relates to a kind of steel that is used for pressurized vessel with good Z-direction performance and preparation method thereof.
Background technology
Along with developing rapidly of China's oil chemical industry, the production of the liquefaction of gas, separation and liquefied gas, accumulating are quite general, and these have all promoted the development of steel for low-temperature pressure container.Steel plate for low temperature pressure container is the very important professional steel plate of a kind of purposes, be used for making the key position of low-temperature pressure container, and bear certain pressure, therefore for steel for low-temperature pressure container, not only to ensure outside higher intensity and good welding property and processing characteristics and necessary physicals, also require the stable and good low-temperature flexibility of low temperature undertissue, low-temperature flexibility is the most important technical indicator of steel for low-temperature pressure container.Because general sheet metal thickness directional performance is relatively poor, relative reduction in area is low, thereby cause steel plate shorter work-ing life, be prone to lamellar tearing and fracture, special picture boiler and this risk level of pressurized vessel are high, the industry that envrionment conditions is poor easily causes immeasurable loss to people's life, production and life.
National standard: GB 3531-2008 provides a kind of chemical composition and mechanics and processing performance requirement of 09MnNiDR steel, as shown in table 1, table 2.
Table 1 09MnNiDR chemical composition (wt%)
Table 2 09MnNiDR mechanics and processing performance requirement
The CN101144138 Chinese patent has been set forth a kind of steel plate for low temperature pressure container and production method thereof, its steel plate main chemical compositions content (wt%) is: C:0.12~0.19%, Si:0.15~0.45%, Mn:1.2~1.6%, Nb:0.015~0.050%, Ti:0.01~0.03%, Ni:0.10~0.35%, Al:0.015~0.030%, P:0~0.015%; S:0~0.01%, all the other are Fe and inevitable impurity.It uses hot billet-charging, intermediate blank water-cooled, controlled rolling, adds the techniques such as speed control is cold, normalizing, more than-40 ℃ of ballistic works reach 160J.
The CN101082104 Chinese patent has been set forth a kind of nickel-free micro-alloy low-temperature pressure vessel steel and manufacture method thereof, its composition quality per-cent is: C:0.04~0.08%, Si:<0.6%, Mn:1.0~1.6%, Nb:0.01~0.03%, Ti:0.00~0.03%, V:<0.07%, Al:0.004~0.60%, N:<0.008%, P:<0.015%, S:<0.010%, all the other are Fe and inevitable impurity.It is by rational design of alloy and technology controlling and process, adopts the rolling method of TMCP to make more than the yield strength of steel plate reaches 360MPa, and tensile strength surpasses 490MPa, and low-temperature impact toughness satisfies the requirement of-60 ℃.
The CN1106070A Chinese patent has been set forth a kind of low-temp. weldable thin-grain steel plate, and its formula for a product has C:0.12~0.17%, Mn:1.20~1.70%, Si:0.30~0.50%, P:0.015%, S:0.005%, V:0.02~0.04%, Ti:0.02~0.04%, Cu:0.12~0.16%, Cr:0.08~0.15%, Mo:0.04~0.09%, Ni:0.10~0.30%, all the other are Fe and inevitable impurity.It with steel scrap enter open hearth just refine, after enter external refining, water into octagon ingot, octagon ingot is swaged into strip plate, require strip plate according to steel plate thickness on four-high reversing mill, subcritical processing is adopted in thermal treatment, comes out of the stove rear air-cooled.
Although in above-mentioned document, disclosed various steel have certain feature performance benefit, yet they all can not provide good in the sheet metal thickness directional performance, so relative reduction in area is low, thereby cause steel plate shorter work-ing life, are prone to lamellar tearing and fracture.Therefore, when these steel during for the manufacture of pressurized vessel, the easily and damage of build-up of pressure container short due to its life-span.
Summary of the invention
The object of the present invention is to provide a kind of steel and manufacture method thereof that can overcome at least a problem of the prior art.
To achieve these goals, an aspect of of the present present invention provides a kind of steel for pressurized vessel, the chemical composition content of described steel (wt%) is: C:0.06~0.10%, Si:0.20~0.40%, Mn:1.40~1.55%, Ni:0.4~0.6%, P :≤0.015%, S :≤0.004%, Nb:0.025-0.040%, Ti:0.020~0.050%, Alt:0.020~0.055%, all the other are iron and inevitable impurity.
According to a further aspect in the invention, the chemical composition content of described steel (wt%) is: C:0.07%, Si:0.26%, Mn:1.45%, Ni:0.5%, P:0.008%, S:0.004%, Nb:0.030%, Ti:0.033%, Alt:0.043%, all the other are iron and inevitable impurity.
According to a further aspect in the invention, described steel adopts the two-stage controlled rolling, 1140~1180 ℃ of roughing start rolling temperatures, and 1060~1120 ℃ of finishing temperatures, the finish rolling start rolling temperature is 870~920 ℃, and final cooling temperature is 650~680 ℃, and speed of cooling is 7~11 ℃/s.
According to a further aspect in the invention, described steel carries out normalizing treatment through Overheating Treatment with described steel, wherein, and 880~910 ℃ of normalizing treatment temperature, soaking time 1.4~1.9min/mm in stove.
According to an aspect of the present invention, the weave construction of described steel is single ferrite+pearlitic structure.
Another aspect of the present invention provides a kind of preparation method of the steel for pressurized vessel, and the method comprises the steps: to smelt, and molten iron smelting is become steel and regulate the composition of steel; Rolling, steel rolling is become the steel of expectation; Thermal treatment is advanced normalizing treatment with the steel after rolling, to improve the microstructure of steel.The step of smelting comprises: converter steelmaking, adopt the deoxidation of aluminium manganese titanium, and adopt the low P ferromanganese of low C, Si-Mn, nickel plate, ferrocolumbium to carry out alloying; The LF refining is carried out residue adjustment with aluminum shot, silicon carbide, carbide of calcium, and utilize ferro-niobium in the LF refining, nickel plate, ferrotianium or titanium wire carry out trimming; The RH refining utilizes the RH refining furnace to carry out vacuum-treat, and feeds the calcium iron wire and carry out calcification processing after vacuum-treat.
According to an aspect of the present invention, the chemical composition content of described steel is by weight: C:0.06~0.10%, Si:0.20~0.40%, Mn:1.40~1.55%, Ni:0.4~0.6%, P :≤0.015%, S :≤0.004%, Nb:0.025-0.040%, Ti:0.020~0.050%, Alt:0.020~0.055%, all the other are iron and inevitable impurity.
According to an aspect of the present invention, the chemical composition content of described steel is by weight: C:0.07%, Si:0.26%, Mn:1.45%, Ni:0.5%, P:0.008%, S:0.004%, Nb:0.030%, Ti:0.033%, Alt:0.043%, all the other are iron and inevitable impurity.
According to an aspect of the present invention, the preparation method of described steel also comprises the hot metal pretreatment step, the sulphur in molten iron is controlled at below 0.003%, and makes molten iron temperature be not less than 1250 ℃.
According to an aspect of the present invention, the step of converter steelmaking adopts bottom blowing or top and bottom complex blowing pattern, adopts single slag technique to smelt, and finishing slag basicity is controlled in 3.5~4.5 scopes
According to an aspect of the present invention, the step of LF refining is necessary for yellowish-white slag or white slag at the sinciput slag of slagging tap, and yellowish-white slag or white slag hold-time are not less than 10 minutes, and finishing slag basicity is more than 2.2.
According to an aspect of the present invention, the vacuum tightness in the vacuum tank of the step of RH refining is 80~200mbar, and after vacuum-treat, calcium iron wire feed quantity is 0.6~0.8Kg/t steel.
According to an aspect of the present invention, rolling step comprises employing two-stage controlled rolling, 1140~1180 ℃ of roughing start rolling temperatures, 1060~1120 ℃ of finishing temperatures, the finish rolling start rolling temperature is 870~920 ℃, and final cooling temperature is 650~680 ℃, and speed of cooling is 7~11 ℃/s.
According to an aspect of the present invention, 880~910 ℃ of normalizing treatment temperature, soaking time 1.4~1.9min/mm in stove.
Embodiment
The below will describe in detail according to the steel of exemplary embodiment of the present invention and manufacture method thereof.
The chemical component weight degree of steel according to an embodiment of the invention is:
C:0.06~0.10%, Si:0.20~0.40%, Mn:1.40~1.55%, Ni:0.4~0.6%, P :≤0.015%, S :≤0.004%, Nb:0.025-0.040%, Ti:0.020~0.050%, Alt:0.020~0.055%, all the other are iron and inevitable impurity.
The Main Function of alloying element in low-temperature pressure container that the present invention selects is:
Carbon (C): carbon is strengthening element most economical in steel, increase the content of carbon, the yield-point of material and tensile strength raise, but plasticity and impact property reduce, the steel grade that particularly need to weld this class of pressure vessel steel, too high carbon content will worsen cold forming capability and welding property.Therefore, in the present invention, carbon content control is at 0.06~0.10wt%.
Silicon (Si): the effect of silicon its solution strengthening in steel, silicon is also good deoxidant element in steel simultaneously, silicon can significantly improve the intensity of steel in low-temperature pressure container, but reduces to a certain extent toughness, the plasticity of steel simultaneously.The increase of Si content also will reduce the welding property of material, and therefore, in the present invention, carbon content control is at 0.20~0.40wt%.
Manganese (Mn): in low-temperature pressure container, manganese can stop growing up of austenite crystal in the temper process, improve toughness and the intensity of ferrite matrix, manganese can improve austenitic stability and reduce the austenite phase transformation temperature in addition, manganese is weak carbide forming element, and the main solution strengthening effect that rises, be conducive to improve the austenitic transformation tissue intensity in steel, and manganese can improve the hot workability of steel, reduces the cold shortness of steel.Therefore, in the present invention, manganese as main alloy element, is controlled at 1.40~1.55wt% with manganese content.
Nickel (Ni): nickel is solid solution element in steel, has the effect of obvious reduction Cold Brittleness Transition Temperature.Nickel and iron with the form of dissolving each other be present in α and γ iron mutually in, the adsorption refinement ferrite crystal grain by it in crystal grain improves the impelling strength of steel.But nickel reduces austenitic transition temperature simultaneously, affects the velocity of diffusion of carbon and alloying element, stops austenite to perlitic transformation, reduce the critical cooling velocity of steel, improve the hardening capacity of steel, easily make steel bainite and martensite occur, reduce the low-temperature impact toughness of steel.Therefore, the present invention is controlled at 0.4~0.6wt% with Ni content, guarantees that ferrite and pearlite organizes to improve low-temperature flexibility.
Niobium (Nb): niobium is strong carbonitride forming element, can form with carbon nitrogen and stable Nb (C, N) compound, along the austenite grain boundary disperse educt, hinder growing up of austenite crystal, thereby refinement ferrite crystal grain, improve intensity and the low-temperature flexibility of steel.Therefore, in Composition Design, control the content of Nb at 0.025-0.040wt%, make Nb as far as possible with form disperse educt in steel of compound.
Titanium (Ti): titanium is a kind of strong carbonitride forming element, the Ti (C, N) that separates out when the roughing of high temperature austenite district can effectively suppress Austenite Grain Growth, Ti in steel (C, N) particle can significantly stop the heat affected zone grain growth, thereby the welding property of improving steel plate has obvious effect to the impelling strength of improving welded heat affecting zone simultaneously.Therefore, the present invention is controlled at 0.020~0.050wt% with titanium content.
Aluminium (Al): aluminium energy crystal grain thinning, improve intensity, in conjunction with generating AlN, can prevent strain aging, and reductor adds in steel as a supplement, improves steel with nitrogen (N).In general, remain in the Trace Aluminum in steel, the welding quality impact is little, if aluminium uses in a large number as alloying element, the welding property of steel is degenerated.And having data to show the rising of Al content, the probability that steel plate occurs to split on the limit also uprises thereupon.Therefore, the present invention is controlled at 0.020~0.055wt% with aluminium content.In metallurgy industry, the content of Al uses full aluminium (Alt) to represent usually, and this is known to those of ordinary skills, therefore, for the sake of clarity, here will no longer be repeated in this description.
Sulphur (S), phosphorus (P): P and S are harmful element in low-temperature pressure vessel steel, and P can reduce the plasticity of steel, and is unfavorable to welding property, and the susceptibility of splitting is welded in increase, easily form segregation, thereby improved the rank of banded structure, should reduce as far as possible the content of phosphorus in steel.S is at grain boundaries segregation and the formation sulfide of steel, and the sulfide fusing point is lower, thereby has reduced impelling strength and the high-temperature behavior of steel.Therefore, P, the S content in should the reduce steel when smelting and control sulfide inclusion, the present invention is controlled at phosphorus content less than 0.015wt%, sulphur content and is controlled at less than 0.004wt%.
The below will describe the production method that is used for according to an embodiment of the invention the steel of low-temperature pressure container in detail, and the method comprises the steps:
Hot metal pretreatment: desulfurizing iron strict implement technological process, molten iron sulphur is controlled at below 0.003wt%, and temperature is not less than 1250 ℃, the complete slag that scratches clean the molten iron surface of desulfurization.Yet hot metal pretreatment is not necessary step, if molten steel quality itself is higher, for example, if the sulphur content in molten iron can be omitted this step originally just less than 0.003wt%.
Smelting technology: converter smelting adopts top and bottom complex blowing or bottom blowing pattern, adopt single slag technique, whole basicity is controlled in the 3.5-4.5 scope, adopt the low P ferromanganese of low C, Si-Mn, nickel plate, ferrocolumbium to carry out alloying, adopt the deoxidation of aluminium manganese titanium, aluminium manganese titanium add-on 2.0kg/t steel begins evenly to add alloy to 1/4 the time when molten steel goes out, molten steel goes out to 3/4 o'clock to add, and alloy is aimed at steel stream impact zone and added.
The LF refining adopts aluminum shot, silicon carbide, carbide of calcium to carry out residue adjustment, and the sinciput slag of slagging tap is necessary for yellowish-white slag or white slag, and yellowish-white slag or white slag hold-time are not less than 10 minutes, and finishing slag basicity is controlled at more than 2.2 as far as possible.The LF refining is prepared part ferro-niobium, nickel plate, ferrotianium or titanium wire and is carried out trimming.
This tupe is adopted in the RH refining.Vacuum tightness in RH refining vacuum-treat vacuum tank is 80~200mbar, and RH avoids chemical heating when processing, and guarantees that the pure degassed time was greater than 5 minutes.After vacuum-treat, feed the calcium iron wire and carry out calcification processing, the calcium iron wire is with reference to feed quantity 0.6~0.8Kg/t steel.Line feeding finishes to guarantee that the soft blow time is not less than 10 minutes.
More than described according to the smelting of steel of the present invention and an exemplary embodiment of method of refining.Yet the invention is not restricted to this, it will be appreciated by those skilled in the art that can be with well known to a person skilled in the art that any method smelts the steel with composition of the present invention.For example, according to different molten iron, can omit or change hot metal pretreatment technology, change the oxygen blast mode, change the add-on of alloy and add mode or change the refining mode.Those skilled in the art can grasp this area various smelting modes commonly used, thereby obtain to have the steel of composition of the present invention.
Will be further described below the post-processed method according to the steel of exemplary embodiment of the present invention.
Adopt the whole process protection cast in the sheet billet continuous casting process.Covering slag adopts low-carbon steel protecting slag.Stationary phase, pulling rate was controlled at 0.8~0.9m/min.Two water-cooleds adopt weak cold pattern.The strand stacking slow cooling 48h that rolls off the production line send later on again and rolls.
Rolling technology: strand adds thermal recovery cold charge stove, and the soaking zone residence time is no less than 50 minutes.1150~1200 ℃ of steel billet tapping temperatures, the operation of rolling adopts the two-stage rolling, four-high reversing mill is adopted in roughing and finish rolling, 1140-1180 ℃ of rough rolling of steel billets start rolling temperature, 1060~1120 ℃ of finishing temperatures, roughing overall compression ratio>50%, 870~920 ℃ of finish rolling start rolling temperatures, final cooling temperature is 650~680 ℃, and speed of cooling is 7~11 ℃/s, and the steel plate slow cooling is more than 48 hours.
Thermal treatment process: soaking time 1.4~1.9min/mm in 880~910 ℃ of normalizing treatment temperature, stove.After steel plate is come out of the stove, individual keeps flat, steel plate collecting temperature≤150 ℃.
Abovely describe one embodiment of the present of invention with the more casting and rolling process of present use, yet the invention is not restricted to this.According to one embodiment of present invention, also can adopt pouring molten steel is become steel ingot, and then the technique of utilizing steel ingot to carry out steel rolling is carried out post-processed to steel.
The present invention uses the Technologies such as hot metal pretreatment, converter smelting, LF refining, RH refining, continuous casting, heating of plate blank, controlled rolling and controlled cooling, normalizing treatment, and the effect of fully using various alloying elements, produce more than the low-temperature pressure vessel steel yield strength reaches 330MPa, more than tensile strength reaches 470MPa, unit elongation 31%, more than-70 ℃ of ballistic works reach 200J, the Z-direction performance reaches the Z35 rank, this steel grade is fit to serialization production, moderate strength, plasticity is good, and low-temperature flexibility is high, and Z-direction is functional.
Below by concrete example, the present invention is further described, these embodiment are only the descriptions to best mode for carrying out the invention, the invention is not restricted to this.
Example 1:
The manufacture method of steel for low-temperature pressure container, the technological process of production comprise hot metal pretreatment, converter smelting, LF refining, RH refining, sheet billet continuous casting, strand slow cooling, Plate rolling, steel plate slow cooling, normalizing thermal treatment.Concrete operation step is as follows:
Desulfurizing iron strict implement technological process, molten iron sulphur is controlled at 0.002wt%, 1300 ℃ of temperature, the complete slag that scratches clean the molten iron surface of desulfurization.Pretreated molten iron enters converter, and slag material added in terminal point in front 3 minutes, and finishing slag basicity is controlled at R=4.0.Adopt the deoxidation of aluminium manganese titanium, aluminium manganese titanium 2.0kg/t steel.Molten steel goes out to four/for the moment, adds the low P ferromanganese of low C, Si-Mn, nickel plate, ferrocolumbium in batches, goes out to 3/4ths o'clock to add.Molten steel after converter smelting enters the LF refining furnace, adds aluminum shot, silicon carbide, carbide of calcium to carry out slag making according to practical situation, and yellowish-white slag or white slag hold-time are 14 minutes.Enter the RH refining furnace through the molten steel after the LF refining, this tupe is adopted in the RH refining.RH avoids chemical heating when processing, and guarantees 8 minutes pure degassed time, and the calcium iron wire is with reference to feed quantity 0.7Kg/t steel.Line feeding finishes 13 minutes soft blow time.Continuous casting adopts the whole process protection cast, and covering slag adopts low-carbon steel protecting slag.Two water-cooleds adopt weak cold pattern, and one-level is softing-cooling-300, and secondary is AMedC, adopt dynamic soft-reduction Dyn Lowc-300.Stationary phase, pulling rate was 0.85m/min.The steel billet stacking slow cooling was sent later on and is rolled in 48 hours again.
Strand adopts the cold charge stove, 85 minutes heat-up times of stable section, 1190 ℃ of steel billet tapping temperatures, 1170 ℃ of roughing start rolling temperatures, 1100 ℃ of finishing temperatures, workpiece thickness 140mm, 900 ℃ of finish rolling start rolling temperatures, 660 ℃ of final cooling temperatures, 10 ℃/s of speed of cooling.Soaking time 1.6min/mm in 900 ℃ of normalizing treatment Heating temperatures, stove, 100 ℃ of steel plate collecting temperature, finished steel plate thickness 80mm.The chemical composition of example sees Table 3, and the object performance detected result sees Table 4.
Example 2:
Embodiment is with example 1, operation of rolling workpiece thickness 130mm wherein, finished product thickness 60mm, 890 ℃ of normalizing treatment Heating temperatures.The chemical composition of example sees Table 3, and the object performance detected result sees Table 4.
Example 3:
Embodiment is with example 1, operation of rolling workpiece thickness 100mm wherein, finished product thickness 40mm, 880 ℃ of normalizing treatment Heating temperatures.The chemical composition of example sees Table 3, and the object performance detected result sees Table 4.
The chemical composition example (wt%) of a kind of steel plate for low temperature pressure container of table 3 the present invention
Can guarantee that according to the steel of exemplary embodiment of the present invention weave construction is single ferrite+pearlitic structure, make steel plate repeatedly organize maintenance stable after hot-work in welding, SR processing etc.In addition, take full advantage of the solution strengthening effect of Ni in steel to improve intensity and the low-temperature flexibility of steel.Utilize the disperse educt of the formed carbonitride of Nb, composition refinement original austenite grains is to improve intensity and the low-temperature flexibility of steel.Therefore, steel according to the present invention has good Z-direction performance, thereby can produce the low-temperature pressure container that reliability has improved.
With reference to certain exemplary embodiments, the present invention has been described, yet those of ordinary skills are to be understood that, without departing from the spirit and scope of the present invention, can carry out various modifications and change to these embodiment, scope of the present invention is limited by claims and equivalent thereof.

Claims (11)

1. steel that is used for pressurized vessel, the chemical composition content of described steel is by weight: C:0.06~0.10%, Si:0.20~0.40%, Mn:1.40~1.55%, Ni:0.4~0.6%, P :≤0.015%, S :≤0.004%, Nb:0.025-0.040%, Ti:0.020~0.050%, Alt:0.020~0.055%, all the other are iron and inevitable impurity
Wherein, described steel is through normalizing treatment, and wherein, the normalizing treatment temperature is 880~910 ℃, and in stove, soaking time is 1.4~1.9min/mm.
2. steel as claimed in claim 1, wherein, the chemical composition content of described steel is by weight: C:0.07%, Si:0.26%, Mn:1.45%, Ni:0.5%, P:0.008%, S:0.004%, Nb:0.030%, Ti:0.033%, Alt:0.043%, all the other are iron and inevitable impurity.
3. steel as claimed in claim 1, wherein, described steel adopts the two-stage controlled rolling, 1140~1180 ℃ of roughing start rolling temperatures, 1060~1120 ℃ of finishing temperatures, the finish rolling start rolling temperature is 870~920 ℃, final cooling temperature is 650~680 ℃, and speed of cooling is 7~11 ℃/s.
4. steel as claimed in claim 1, wherein, the weave construction of described steel is single ferrite+pearlitic structure.
5. preparation method who is used for the steel of pressurized vessel, the method comprises the steps:
Smelt, molten iron smelting is become steel and regulate the composition of steel;
Rolling, steel rolling is become the steel of expectation; And
Thermal treatment is advanced normalizing treatment with the steel after rolling, and to improve the microstructure of steel, wherein, the normalizing treatment temperature is 880~910 ℃, and in stove, soaking time is 1.4~1.9min/mm,
Wherein, the step of described smelting comprises:
The deoxidation of aluminium manganese titanium is adopted in converter steelmaking, adopts the low P ferromanganese of low C, Si-Mn, nickel plate, ferrocolumbium to carry out alloying;
The LF refining is carried out residue adjustment with aluminum shot, silicon carbide, carbide of calcium, and utilize ferro-niobium in the LF refining, nickel plate, ferrotianium or titanium wire carry out trimming; And
The RH refining utilizes the RH refining furnace to carry out vacuum-treat, and feeds the calcium iron wire and carry out calcification processing after vacuum-treat,
Wherein, the chemical composition content of described steel is by weight: C:0.06~0.10%, Si:0.20~0.40%, Mn:1.40~1.55%, Ni:0.4~0.6%, P :≤0.015%, S :≤0.004%, Nb:0.025-0.040%, Ti:0.020~0.050%, Alt:0.020~0.055%, all the other are iron and inevitable impurity.
6. method as claimed in claim 5, wherein, the chemical composition content of described steel is by weight: C:0.07%, Si:0.26%, Mn:1.45%, Ni:0.5%, P:0.008%, S:0.004%, Nb:0.030%, Ti:0.033%, Alt:0.043%, all the other are iron and inevitable impurity.
7. as method as claimed in claim 5, the method also comprises the hot metal pretreatment step, the sulphur in molten iron is controlled at below 0.003%, and makes molten iron temperature be not less than 1250 ℃.
8. method as claimed in claim 5, wherein, the step of described converter steelmaking adopts bottom blowing or top and bottom complex blowing pattern, adopts single slag technique to smelt, and finishing slag basicity is controlled in 3.5~4.5 scopes.
9. method as claimed in claim 5, wherein, the step of described LF refining is necessary for yellowish-white slag or white slag at the sinciput slag of slagging tap, and yellowish-white slag or white slag hold-time are not less than 10 minutes, and finishing slag basicity is more than 2.2.
10. method as claimed in claim 5, wherein, the vacuum tightness in the vacuum tank of the step of described RH refining is 80~200mbar, after vacuum-treat, calcium iron wire feed quantity is 0.6~0.8Kg/t steel.
11. method as claimed in claim 5, wherein, described rolling step comprises employing two-stage controlled rolling, 1140~1180 ℃ of roughing start rolling temperatures, 1060~1120 ℃ of finishing temperatures, the finish rolling start rolling temperature is 870~920 ℃, and final cooling temperature is 650~680 ℃, and speed of cooling is 7~11 ℃/s.
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CN102676920B (en) * 2012-04-25 2014-05-21 舞阳钢铁有限责任公司 Large-thickness steel plate for low-temperature pressure container and production method thereof
CN103834860A (en) * 2014-03-20 2014-06-04 莱芜钢铁集团有限公司 235MPa-level low temperature resisting hot-rolled H-shaped steel and preparation method thereof
CN104611629A (en) * 2015-01-12 2015-05-13 南京钢铁股份有限公司 Normalization acid-resistant pressure vessel steel plate and manufacturing method for steel plate
CN104988435B (en) * 2015-07-11 2017-03-22 江阴兴澄特种钢铁有限公司 Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof
CN107254633A (en) * 2017-05-31 2017-10-17 舞阳钢铁有限责任公司 Low-temperature pressure container 15MnNiNbDR steel plates and production method
CN107904485B (en) * 2017-07-24 2019-10-15 柳州钢铁股份有限公司 420MPa grades of cold rolling low-alloy high-strength steels of yield strength and its manufacturing method
CN110029268B (en) * 2019-03-27 2021-03-26 江阴兴澄特种钢铁有限公司 09MnNiDR steel plate for low-temperature pressure vessel with core low-temperature toughness protection and manufacturing method thereof
CN112680652A (en) * 2020-10-23 2021-04-20 莱芜钢铁集团银山型钢有限公司 Cr-Mo low-alloy steel plate for pressure vessel and preparation method thereof

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