CN102345066A - Steel used for pressure container and preparation method thereof - Google Patents
Steel used for pressure container and preparation method thereof Download PDFInfo
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- CN102345066A CN102345066A CN2011103222611A CN201110322261A CN102345066A CN 102345066 A CN102345066 A CN 102345066A CN 2011103222611 A CN2011103222611 A CN 2011103222611A CN 201110322261 A CN201110322261 A CN 201110322261A CN 102345066 A CN102345066 A CN 102345066A
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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
Technical field
The present invention relates to a kind of steel that is used for pressurized vessel and preparation method thereof, specifically, the present invention relates to a kind ofly have good Z and be used for steel of pressurized vessel and preparation method thereof to performance.
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 to make the key position of low-temperature pressure container; And bear certain pressure; Therefore for steel for low-temperature pressure container; Not only to guarantee outside higher intensity and good welding property and processing characteristics and the 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 of envrionment conditions difference is prone to cause immeasurable loss to people's life, production and life.
National standard: GB 3531-2008 provides a kind of chemical ingredients and mechanics and processing performance requirement of 09MnNiDR steel, shown in table 1, table 2.
Table 1 09MnNiDR chemical ingredients (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 working 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 unavoidable impurities.It uses hot steel billet shove charge, intermediate blank water-cooled, controlled rolling, adds technologies such as speed control is cold, normalizing, and-40 ℃ of ballistic works reach more than the 160J.
The CN101082104 Chinese patent has been set forth a kind of nickel-free micro-alloy low-temperature pressure vessel steel and method of manufacture thereof; Its composition quality per-cent is: C:0.04～0.08%, and 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 adopts the rolling method of TMCP to make the yield strength of steel plate reach more than the 360MPa through rational design of alloy and technology controlling and process, and tensile strength surpasses 490MPa, and low-temperature impact toughness satisfies-60 ℃ requirement.
The CN1106070A Chinese patent has been set forth a kind of low temperature resistant close grain thickness direction steel plate that welds, 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 gets into steel scrap, and open hearth just refines, the back gets into external refining, waters into octagon ingot, and octagon ingot is swaged into strip plate, and according to steel plate thickness requirement strip plate, subcritical processing is adopted in thermal treatment on four-high reversing mill, and the back of coming out of the stove is air-cooled.
Though disclosed various steel have certain feature performance benefit in the above-mentioned document, 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 are used to make pressurized vessel, the damage of build-up of pressure container because its life-span is short easily.
Summary of the invention
The object of the present invention is to provide a kind of steel and method of manufacture thereof that can overcome at least a problem of the prior art.
To achieve these goals; One side of the present invention provides a kind of steel that is used for pressurized vessel; The chemical composition content of said steel (wt%) is: C:0.06～0.10%, Si:0.20～0.40%, Mn:1.40～1.55%, Ni:0.4～0.6%, P: S≤0.015% :≤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 said 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 unavoidable impurities.
According to a further aspect in the invention, said 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, said steel carries out normalizing treatment through Overheating Treatment with said steel, wherein, and 880～910 ℃ of normalizing treatment temperature, soaking time 1.4～1.9min/mm in the stove.
According to an aspect of the present invention, the weave construction of said steel is single ferrite+pearlitic structure.
Another aspect of the present invention provides a kind of preparation method who is used for the steel of pressurized vessel, and this 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 in the LF refining, utilize ferro-niobium, nickel plate, ferrotianium or titanium wire carry out trimming; The RH refining utilizes the RH refining furnace to carry out vacuum-treat, and after vacuum-treat, feeds the calcium iron wire and carry out calcification processing.
According to an aspect of the present invention; The chemical composition content of said 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: S≤0.015% :≤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 said 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 unavoidable impurities.
According to an aspect of the present invention, the preparation method of said steel also comprises the hot metal pretreatment step, the sulphur in the 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 technology to smelt, and finishing slag basicity is controlled in 3.5～4.5 scopes
According to an aspect of the present invention, LF purified step 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 were 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 RH purified step is 80～200mbar, and after the 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 the stove.
Embodiment
To describe steel and method of manufacture thereof below in detail according to exemplary embodiment of the present invention.
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: S≤0.015% :≤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 effect of alloying element in low-temperature pressure container that the present invention selects is:
Carbon (C): carbon is strengthening element most economical in the steel; Increase the content of carbon, the yield-point of material and tensile strength raise, but plasticity and impact property reduce; Particularly this type of pressure vessel steel needed the steel grade of welding, too high carbon content will worsen cold forming capability and welding property.Therefore, in the present invention, carbon content is controlled at 0.06～0.10wt%.
Silicon (Si): the effect of silicon its solution strengthening in steel, silicon also is good deoxidant element in steel simultaneously, silicon can significantly improve the intensity of steel in low-temperature pressure container, but reduces toughness, the plasticity of steel simultaneously to a certain extent.The increase of Si content also will reduce material welding performance, and therefore, in the present invention, carbon content is controlled 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 the 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, in steel, mainly plays the solution strengthening effect, helps improving the austenitic transformation tissue intensity; And manganese can improve the hot workability of steel, reduces the cold shortness of steel.Therefore, among 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 are present in α and the γ iron phase with the form of dissolving each other, and at intragranular adsorption refinement ferrite crystal grain, improve the impelling strength of steel through it.But nickel reduces austenitic transition temperature simultaneously, influences 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, be prone to make steel bainite and martensite to 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 pearlitic structure are to improve low-temperature flexibility.
Niobium (Nb): niobium is an intensive carbonitride forming element, can form and stable Nb (C, N) compound with carbon nitrogen, separates out along the austenite grain boundary disperse, hinders growing up of austenite crystal, thus refinement ferrite crystal grain, improve the intensity and the low-temperature flexibility of steel.Therefore, in the composition design, the content of control Nb separates out Nb at 0.025-0.040wt% as far as possible with form disperse in steel of compound.
Titanium (Ti): titanium is a kind of strong carbonitride forming element; The Ti (C, N) that separates out during roughing in the high temperature austenite district can effectively suppress austenite crystal and grow up; The Ti of steel grade (C, N) particle can significantly be organized 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 ability crystal grain thinning, improve intensity, combine with nitrogen (N) to generate AlN, can prevent strain aging, and, improve steel as replenishing in the reductor adding steel.In general, remain in the Trace Aluminum in the steel, little to the welding quality influence, if aluminium uses as alloying element in a large number, the welding property of steel is degenerated.And having data to show the rising of Al content, the probability that steel plate takes place 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 that this is known to those of ordinary skills usually, 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; Be prone to form segregation, thereby improved the rank of banded structure, should reduce the content of phosphorus in steel as far as possible.S gathers partially at the crystal boundary place of steel and forms sulfide, and the sulfide fusing point is lower, thereby has reduced the impelling strength and the high-temperature behavior of steel.Therefore, when smelting, reduce P, S content and control sulfide inclusion in the steel, the present invention is controlled at phosphorus content less than 0.015wt%, sulphur content and is controlled at less than 0.004wt% as far as possible.
To describe the working method of the steel that is used for low-temperature pressure container according to an embodiment of the invention below in detail, this method comprises the steps:
Hot metal pretreatment: the strict technological process of carrying out of desulfurizing iron, molten iron sulphur is controlled at below the 0.003wt%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.Yet hot metal pretreatment is not necessary step, if molten steel quality itself is higher, for example, if the sulphur content in the 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 technology; 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 were 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 the RH refining vacuum-treat vacuum tank is 80～200mbar, and RH avoids chemical heating when handling, and guarantees that the pure degassing time was greater than 5 minutes.After the 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 was 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 to use to well known to a person skilled in the art that any method smelts the steel with composition of the present invention.For example,, can omit or change hot metal pretreatment technology, change the oxygen blast mode, change the add-on and the adding mode of alloy or change the refining mode according to different molten iron.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 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.Cold pattern a little less than two water-cooleds adopt.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 steel billet roughing 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 the normalizing treatment temperature, stove.Steel plate come out of the stove the back individual keep flat, steel plate is collected temperature≤150 ℃.
More than with the more casting and rolling process of present use one embodiment of the present of invention have been described, 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 technology of utilizing steel ingot to carry out steel rolling is carried out post-processed to steel.
The present invention uses Technologies such as hot metal pretreatment, converter smelting, LF refining, RH refining, continuous casting, slab heating, controlled rolling controlled chilling, normalizing treatment; And the effect of fully using various alloying elements; Producing the low-temperature pressure vessel steel yield strength reaches more than the 330MPa; Tensile strength reaches more than the 470MPa; Unit elongation 31%;-70 ℃ of ballistic works reach more than the 200J; Z reaches the Z35 rank to performance; This steel grade is fit to serialization production; Intensity is moderate; Plasticity is good, and low-temperature flexibility is high, and Z is to functional.
Through concrete example the present invention is done explanation further below, these embodiment only are the descriptions to best mode for carrying out the invention, the invention is not restricted to this.
Example 1:
The method of manufacture of steel for low-temperature pressure container, the technological process of production comprise that hot metal pretreatment, converter smelting, LF refining, RH refining, sheet billet continuous casting, strand slow cooling, Wide and Thick Slab are rolling, steel plate slow cooling, normalizing thermal treatment.The concrete operations step is following:
The strict technological process of carrying out of desulfurizing iron, molten iron sulphur is controlled at 0.002wt%, 1300 ℃ of temperature, desulfurization finishes and scratches clean the slag on molten iron surface.Pretreated molten iron gets into converter, and the slag making material added in terminal point in preceding 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 behind the converter smelting gets into the LF refining furnace, carries out slag making according to practical situation adding aluminum shot, silicon carbide, carbide of calcium, and yellowish-white slag or white slag hold-time are 14 minutes.Get into the RH refining furnace through the LF molten steel after refining, this tupe is adopted in the RH refining.RH avoids chemical heating when handling, and guarantees 8 minutes pure degassing 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.Cold pattern a little less than two water-cooleds adopt, one-level is softing-cooling-300, secondary is AMedC, adopts and dynamically gently depresses 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, intermediate blank 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 the normalizing treatment Heating temperatures, stove, steel plate is collected 100 ℃ of temperature, Finished Steel plate thickness 80mm.The chemical ingredients of instance is seen table 3, and the object performance detected result is seen table 4.
Example 2:
Embodiment is with example 1, operation of rolling intermediate blank thickness 130mm wherein, finished product thickness 60mm, 890 ℃ of normalizing treatment Heating temperatures.The chemical ingredients of instance is seen table 3, and the object performance detected result is seen table 4.
Example 3:
Embodiment is with example 1, operation of rolling intermediate blank thickness 100mm wherein, finished product thickness 40mm, 880 ℃ of normalizing treatment Heating temperatures.The chemical ingredients of instance is seen table 3, and the object performance detected result is seen table 4.
The chemical ingredients instance (wt%) of a kind of steel plate for low temperature pressure container of table 3 the present invention
Steel according to exemplary embodiment of the present invention can guarantee that weave construction is single ferrite+pearlitic structure, makes steel plate repeatedly organize maintenance stable after the hot-work in welding, SR processing etc.In addition, the solution strengthening that makes full use of Ni in the steel is done in order to improve the intensity and the low-temperature flexibility of steel.Utilize the disperse of the formed carbonitride of Nb to separate out, composition refinement original austenite grains is to improve the intensity and the low-temperature flexibility of steel.Therefore, steel according to the present invention has good Z to performance, thereby can produce the low-temperature pressure container that reliability has improved.
The present invention has been described with reference to certain exemplary embodiments; Yet those of ordinary skills are to be understood that; Under the situation that does not break away 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 claims and equivalent thereof.
Claims (14)
1. steel that is used for pressurized vessel; The chemical composition content of said 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: S≤0.015% :≤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.
2. steel as claimed in claim 1; Wherein, The chemical composition content of said 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 unavoidable impurities.
3. steel as claimed in claim 1, wherein, said 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, said steel carries out normalizing treatment through Overheating Treatment with said steel, wherein, 880～910 ℃ of normalizing treatment temperature, soaking time 1.4～1.9min/mm in the stove.
5. steel as claimed in claim 1, wherein, the weave construction of said steel is single ferrite+pearlitic structure.
6. preparation method who is used for the steel of pressurized vessel, this 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, improving the microstructure of steel,
Wherein, the step of said 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 in the LF refining, utilize ferro-niobium, nickel plate, ferrotianium or titanium wire carry out trimming; And
The RH refining utilizes the RH refining furnace to carry out vacuum-treat, and after vacuum-treat, feeds the calcium iron wire and carry out calcification processing.
7. method as claimed in claim 6; Wherein, The chemical composition content of said 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: S≤0.015% :≤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.
8. method as claimed in claim 7; Wherein, The chemical composition content of said 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 unavoidable impurities.
9. like method as claimed in claim 6, this method also comprises the hot metal pretreatment step, the sulphur in the molten iron is controlled at below 0.003%, and makes molten iron temperature be not less than 1250 ℃.
10. method as claimed in claim 6, wherein, the step of said converter steelmaking adopts bottom blowing or top and bottom complex blowing pattern, adopts single slag technology to smelt, and finishing slag basicity is controlled in 3.5～4.5 scopes.
11. method as claimed in claim 6, wherein, said LF purified step 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 were not less than 10 minutes, and finishing slag basicity is more than 2.2.
12. method as claimed in claim 6, wherein, the vacuum tightness in the vacuum tank of said RH purified step is 80～200mbar, and after the vacuum-treat, calcium iron wire feed quantity is 0.6～0.8Kg/t steel.
13. method as claimed in claim 6; Wherein, Said 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.
14. method as claimed in claim 6, wherein, 880～910 ℃ of normalizing treatment temperature, soaking time 1.4～1.9min/mm in the stove.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676920A (en) * | 2012-04-25 | 2012-09-19 | 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 |
| CN104988435A (en) * | 2015-07-11 | 2015-10-21 | 江阴兴澄特种钢铁有限公司 | Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof |
| WO2016112682A1 (en) * | 2015-01-12 | 2016-07-21 | 南京钢铁股份有限公司 | Normalized acid-resistant pressure vessel 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 |
| CN107904485A (en) * | 2017-07-24 | 2018-04-13 | 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 manufacture method |
| CN110029268A (en) * | 2019-03-27 | 2019-07-19 | 江阴兴澄特种钢铁有限公司 | A kind of low-temperature pressure container 09MnNiDR steel plate and manufacturing method for protecting center portion low-temperature flexibility |
| 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 |
| WO2022222294A1 (en) * | 2021-04-19 | 2022-10-27 | 南京钢铁股份有限公司 | High-toughness quasi-sub-temperature quenched 09mnnidr container steel and preparation method therefor |
| CN115558865A (en) * | 2022-10-21 | 2023-01-03 | 燕山大学 | Hydrogen corrosion resistant normalized high-strength and high-toughness container steel plate for mobile tank car and manufacturing method thereof |
| CN115896616A (en) * | 2022-11-03 | 2023-04-04 | 燕山大学 | Easily-welded normalized pressure vessel steel plate and manufacturing method thereof |
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| CN102676920A (en) * | 2012-04-25 | 2012-09-19 | 舞阳钢铁有限责任公司 | Large-thickness steel plate for low-temperature pressure container and production method thereof |
| 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 |
| WO2016112682A1 (en) * | 2015-01-12 | 2016-07-21 | 南京钢铁股份有限公司 | Normalized acid-resistant pressure vessel steel plate and manufacturing method thereof |
| CN104988435A (en) * | 2015-07-11 | 2015-10-21 | 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 |
| CN107904485A (en) * | 2017-07-24 | 2018-04-13 | 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 manufacture method |
| CN110029268A (en) * | 2019-03-27 | 2019-07-19 | 江阴兴澄特种钢铁有限公司 | A kind of low-temperature pressure container 09MnNiDR steel plate and manufacturing method for protecting center portion low-temperature flexibility |
| 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 |
| WO2022222294A1 (en) * | 2021-04-19 | 2022-10-27 | 南京钢铁股份有限公司 | High-toughness quasi-sub-temperature quenched 09mnnidr container steel and preparation method therefor |
| CN115558865A (en) * | 2022-10-21 | 2023-01-03 | 燕山大学 | Hydrogen corrosion resistant normalized high-strength and high-toughness container steel plate for mobile tank car and manufacturing method thereof |
| CN115896616A (en) * | 2022-11-03 | 2023-04-04 | 燕山大学 | Easily-welded normalized pressure vessel steel plate and manufacturing method thereof |
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Effective date of registration: 20210720 Address after: 271104 Shuangquan Road, Gangcheng District, Jinan City, Shandong Province Patentee after: LAIGANG GROUP YINSHAN SHAPED STEEL Co.,Ltd. Address before: Friendship Street 271100 Shandong province Laiwu City Gangcheng District No. 38 Patentee before: Laiwu Steel Group Ltd. |