CN107937804B - High tenacity steel plate for low temperature pressure container and its manufacturing method - Google Patents
High tenacity steel plate for low temperature pressure container and its manufacturing method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses a kind of high tenacity steel plate for low temperature pressure container and preparation method thereof, the chemical component and its weight percent of the steel are as follows: C:0.090~0.130%, Si≤0.15%, Mn:1.40~1.80%, P≤0.012%, S≤0.004%, V:0.27~0.45%, N:0.010~0.020%, Alt≤0.020%, remaining is Fe and is inevitably mingled with, meet simultaneously: 3≤V/C≤4,1.2≤V/ (C+Si)≤3.Hardness of steel high and low temperature impact flexibility of the present invention is good, -60 DEG C of KV2>=80J provides a kind of excellent making material for low-temperature pressure container, not only lays a good foundation for the enlargement and lightweight of low-temperature pressure container, the delivery efficiency and economic benefit of transportable pressure vessel is also greatly improved.
Description
Technical field
The present invention relates to low-alloy steel, in particular to a kind of high tenacity steel plate for low temperature pressure container and its manufacturing method.
Background technique
Importance of the refrigeration and cryogenic technology in modern industry and scientific research increasingly increases, and Cryo Equipment is passed through in its people
Application in Ji is also increasingly extensive.The design of cryogenic mechanical eventually faces two problems, one is selection is this for manufacturing
The suitable material of device；The second is carrying out the Strength co-mputation of selected materials under running conditions.Different from general engineering design,
Cryo Equipment material selection largely by the operating condition of low temperature and material mechanical compel and physical property restricted.
Thus, understand the special nature of material under low temperature, possesses their physical data, correctly select suitable cryogenic material, be to grind
System and design cryogenic mechanical guarantee its essential condition being reliably enduringly safely operated.In order to guarantee the safety fortune of Cryo Equipment
Row, the metal material for manufacturing Cryo Equipment must have enough plasticity and toughness at low temperature, and have higher mechanical strong
Degree, and have stable structure and good processing performance.
Transportable pressure vessel is broadly divided into truck tank, tank car and tank container.Transportable pressure vessel storage
The medium of fortune is liquefied gas, cryogenic liquid and permanent gas, such as liquefied petroleum gas, ethylene oxide, liquid oxygen, liquefied ammonia, liquid two
Carbonoxide, liquefied natural gas and compressed natural gas, hydrogen etc..It is mostly in the transportable pressure vessel steel that the country uses at present
Normalizing type steels for pressure vessel use, and the tank body material mostly used is mostly the steel that tensile strength is less than 610MPa grades, causes tank wall
Thick larger, ratio of light weight to loading capacity accordingly increases, and volume to weight ratio is small, delivers low efficiency.
Nickel is non-carbide forming element, it and carbon effect do not form carbide, but form α and γ solid solution, nickel with iron
The stability of the increase of content, austenite increases, therefore nickel is the element to be formed with stable austenite, and nickel is the low temperature for improving steel
Toughness reduces the most effective element of brittle transition temperature.Currently used nickel system low-temperature steel has 1.5Ni, 2.5Ni, 3.5Ni, 5Ni
Deng the higher steel containing Ni, nickel system low-temperature steel is had the following problems: 1) Ni is a kind of compared with noble element, about 280000 yuan/ton, is increased
Cost；2) slab of the steel containing the Ni dense oxide iron sheet easy to form for being difficult to remove when heated gives heating rolling process band
Come difficult.Therefore it explores inexpensive and can guarantee that the production technology of good low-temperature flexibility becomes as low-temperature (low temperature) vessel microalloy
High-strength steel technical problem urgently to be resolved.
China Patent Publication No. is the patent document of CN 101497961B, disclose a kind of low-temperature flexibility 1.5Ni steel and its
Manufacturing method, the weight percent proportion of chemical component are as follows: C0.02~0.10wt%, Si0.22~0.30wt%, Mn1.00~
1.50wt%, V≤0.08wt%, Ni1.20~1.60wt%, S≤0.005wt%, P≤0.010wt%, Nb≤0.03wt%,
Ti≤0.04wt%, Al≤0.04wt%, N0.002~0.005wt%, remaining is Fe and inevitable impurity.The invention steel
With micro alloyed steel after controlled rolling, the method production kind yield strength of modifier treatment reaches 400MPa or more, tensile strength
500MPa or more, low-temperature impact toughness meet the method for the High-strength low-temperature pressure vessel steel plate of -100 DEG C of requirements.Existing for it
Deficiency is using higher Ni content in ingredient, and heat treatment process uses twice heat treatment process, and the two promotes the production of steel plate
Increased costs, and the intensity of steel plate and yield tensile ratio are not able to satisfy the invention requirement, and ferrite crystal grain mixed crystal is serious, and compared with
The crystallite dimension of steel of the present invention is big, and low-temperature impact toughness is poor.
The Chinese patent of Publication No. CN101235466B discloses a kind of high ductility negative 110 degree low-temperature steel and its manufacturer
Method CN101235466B, the steel are by following weight percentage at being grouped as: C 0.02~0.12%, Si0.10~
0.35%, Mn 0.30~0.80%, P≤0.015%, S≤0.010%, Ni 3.20~3.80%, Ti 0.005~
0.05%, Al0.005~0.10%, additionally contain Nb≤0.050%, V≤0.10%, Cu≤2.0%, Mo≤0.50%,
Zr≤0.040%, two or more in RE≤0.020%, surplus Fe.The manufacturing method is applied in casting billet surface
Antioxidizing paint is applied, is produced using cooling controlling and rolling controlling process rolling, normalizing+tempering heat treatment process with stable and excellent
- 110 DEG C of low-temperature flexibilities low-temperature tough steel, contain 3.5%Ni in the ingredient of the steel, so that the cost of steel sharply increases, adopt
With twice heat treatment process, production cost is increased.
The Chinese patent of Publication No. CN103122436A discloses a kind of -70 DEG C of normalizing type steel for low-temperature pressure container
Plate, the present invention relates to a kind of -70 DEG C of normalizing type low-temperature pressure vessel steel plates and its manufacturing methods, and the chemical component of steel plate is by weight
Percentage be C:0.09~0.12%, Si:0.15~0.50%, Mn:1.2~1.6%, P≤0.015%, S≤0.005%,
Nb:0.02~0.04%, Ni:0.40~0.80%, Ti:0.006~0.010%, Alt:0.020~0.034%, surplus Fe
With inevitable impurity.The manufacturing method is: molten iron and steel scrap of the use Jing Guo desulfurization pretreatment are as raw material, by converter
It is low that the processes such as smelting, LF refining, RH application of vacuum, continuous casting, heating, rolling and cooling, normalizing heat treatment obtain -70 DEG C of normalizing types
Warm steel plate of pressure vessel.Its advantage is that: yield strength is greater than 380MPa, has good plasticity, -70 DEG C of excellent low-temperature impacts
Toughness can be widely used for the cryogenic pressure vessel equipments such as manufacture liquid chlorine storage tank, elevated pressure nitrogen storage tank, ammonia cooler.The ingredient of the steel
In contain 0.5%Ni so that the cost of alloy of steel improves, using twice heat treatment process, increase production cost, and lower
At a temperature of be not able to satisfy the application requirement of low-temperature flexibility.
The Chinese patent of Publication No. CN101497961B discloses 60 kg class low cost, ductility steel plate and its system
Make method, the chemical component of steel plate is C:0.145%~0.185% by weight percentage, Si≤0.30%, Mn:1.35%~
1.65%, P≤0.013%, S≤0.003%, Cu≤0.25%, Ni≤0.25%, Als:0.005%~0.015%, V:
0.150%~0.190%, N:0.015%~0.020%, Ca:0.001%~0.003%, surplus is for Fe and inevitably
Impurity.The manufacturing method is: using Jing Guo desulfurization pretreatment molten iron and steel scrap as raw material, by converter smelting, LF refining,
The processes such as RH application of vacuum, continuous casting, heating, rolling and cooling, normalizing+tempering heat treatment obtain -40 DEG C of normalizing type low-temperature pressures
Tank plate.The shortcomings that steel is steel medium pearlite Content 25% or more, and low-temperature impact toughness can only meet -40 DEG C
KV2Requirement, < -70 DEG C of low-temperature flexibility is not able to satisfy the requirement of cryogenic steel.
Chinese patent CN201210253970.3 discloses 460MPa grades of normalizing high strength steel plates of yield strength and its manufacture
Method, the chemical component of steel plate are C:0.145%~0.185% by weight percentage, Si≤0.30%, Mn:1.35%~
1.65%, P≤0.013%, S≤0.003%, Cu≤0.25%, Ni≤0.25%, Als:0.005%~0.015%, V:
0.150%~0.190%, N:0.015%~0.020%, Ca:0.001%~0.003%, surplus is for Fe and inevitably
Impurity.The manufacturing method is: using Jing Guo desulfurization pretreatment molten iron and steel scrap as raw material, by converter smelting, LF refining,
The processes such as RH application of vacuum, continuous casting, heating, rolling and cooling, normalizing+tempering heat treatment obtain -40 DEG C of normalizing type low-temperature pressures
Tank plate.The shortcomings that steel is steel medium pearlite Content 25% or more, and low-temperature impact toughness can only meet -40 DEG C
KV2Requirement, but in steel contain Ni, and use twice heat treatment process, increase manufacturing cost.
Chinese patent CN201210253970.3 disclose a kind of yield strength 460MPa grades of normalizing high strength steel plates and its
Manufacturing method, chemical component are C:0.14%~0.20%, Si:0.20%~0.60%, Mn:1.20% by weight percent
~1.70%, V:0.12%~0.20%, Ni:0.15%~0.40%, N:0.005%~0.020%, Alt:0.005%~
0.040%, P≤0.015%, S≤0.005%, surplus are iron Fe and inevitable impurity.The present invention is passing through controlled rolling ten just
Continuous casting billet is heated to 1210~1240 DEG C by fire process, and heating total time was controlled by 1.0~1.2 minutes/mm；Using two stages
Rolling, the start rolling temperature of Unhydrated cement require control at 850~920 DEG C, and finishing temperature requires control at 780~840 DEG C；It rolls
It is air-cooled afterwards；For the control of steel plate normalizing temperature at 880~920 DEG C, soaking time is 15~40 minutes.Using produced by the present invention high-strength
Steel plate, quality is stable, performance is good, production cost is low.The shortcomings that steel is steel medium pearlite Content 25% or more, low
Warm impact flexibility can only meet -40 DEG C of KV2Requirement, be not able to satisfy the requirement of -70 DEG C of following temperature cryogenic steel.
Summary of the invention
It is strong present invention aim to provide a kind of high tenacity steel plate for low temperature pressure container and its manufacturing method, the steel
Degree is high, and low-temperature impact toughness is good, and at low cost.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of high tenacity steel plate for low temperature pressure container, steel
Chemical component and its weight percent it is as follows: C:0.090~0.130%, Si≤0.15%, Mn:1.40~1.80%, P≤
0.012%, S≤0.004%, V:0.27~0.45%, N:0.010~0.020%, Alt≤0.020%, remaining is for Fe and not
It is evitable to be mingled with, meet simultaneously: 3≤V/C≤4,1.2≤V/ (C+Si)≤3.
Further, the chemical component of steel and its weight percent are as follows: C:0.090~0.130%, Si:0.03~
0.15%, Mn:1.55~1.80%, P:0.005~0.012%, S:0.001~0.004%, V:0.27~0.45%, N:
0.010~0.017%, Alt:0.004~0.018%, remaining is Fe and is inevitably mingled with, and meets simultaneously: 3≤V/C≤
4,1.2≤V/ (C+Si)≤3.
Further, the chemical component of steel and its weight percent are as follows: C:0.090~0.115%, Si:0.12~
0.15%, Mn:1.65~1.75%, P:0.008~0.012%, S:0.001~0.004%, V:0.27~0.43%, N:
0.010~0.013%, Alt:0.004~0.008%, remaining is Fe and is inevitably mingled with, and meets simultaneously: 3≤V/C≤
4,1.2≤V/ (C+Si)≤3.
A kind of manufacturing method of above-mentioned high tenacity steel plate for low temperature pressure container, including smelt, continuous casting, it heats, rolling, heat
Processing step: it is characterized by: the heating stepses, heating temperature is 1100~1260 DEG C, and the rate of heat addition is 8~14min/
cm；The milling step carries out hot rolling, controls 1000 DEG C of start rolling temperature >, controls last three passage and adds up reduction ratio > 30%；
840 DEG C of finishing temperature > of control, compression ratio >=15；The heat treatment step, is heat-treated using normalizing process, controls normalizing
Temperature is 930~1000 DEG C, and is kept the temperature.
Further, in the smelting step, vanadium micro-alloying first is realized through smelting, and it is real then to control N content in steel
Existing v n micro alloying.
Further, the heat treatment step, soaking time are as follows: 20~40 minutes+(steel plate thickness) mm × 1 minute/mm.
Further, the milling step, roughing start rolling temperature be 1080~1150 DEG C, reduction in pass be 15~
24mm, finish rolling finishing temperature are 840~890 DEG C, and it is 26~45% that last three passages, which add up reduction ratio,.
Further, the milling step, roughing start rolling temperature be 1080~1110 DEG C, reduction in pass be 15~
20mm, finish rolling finishing temperature are 840~880 DEG C, and it is 26~40% that last three passages, which add up reduction ratio,.
Further, the heat treatment step, control normalizing temperature are 930~945 DEG C.
Further, the heating stepses, heating temperature are 1215~1240 DEG C.
It is as follows to the essential element and content analysis of steel of the present invention:
C:C is indispensable one of the element for improving steel strength in steel, with the increase of carbon content, steel grade Fe3C increases
Add, hardenability also increases, and the yield strength and tensile strength of steel, which are returned, to be improved, and elongation percentage notch impact toughness returns decline.Carbon contains
Tensile strength can be improved by measuring every increase.Mn/C ratio is higher, bigger to the casting aliquation influence degree of steel, so comprehensively considering
Under the conditions of the composite factor that the casting aliquation that influence and Mn/C of the C to the obdurability of steel compare steel influences, controls C content in steel and exist
0.09~0.13%.
Si:Si can reduce the graphitization tendency of carbon in steel, and the intensity of steel be improved with solution strengthening form, but Si can aggravate
Impurity element is in the segregation of crystal boundary, therefore its content is unsuitable high, in order to avoid the toughness and weldability of steel are reduced, therefore, and control Si≤
0.15%.
Mn:Mn has the intensity for improving low-carbon and middle carbon pearlitic steel to be acted on significantly.It is, in general, that Mn content is 2%
The toughness for improving weld metal is advantageous below, therefore, in low-carbon high strength steel, generally improves the content of Mn, highest
Up to 2%.In addition, Mn can also improve the solubility in steel such as V.But Mn plays the role of that crystal grain is promoted to grow up, quicker to overheating
Sense, therefore Mn content is within 1.40~1.80% in control steel.
P, S: since P, S content in steel must be controlled in lower range, only smelting clean steel, it just can guarantee this hair
Therefore the performance of bright steel controls P≤0.012%, S≤0.004%.
V:V is strong carbonitride-forming elements, it is refined and forming carbide tissue Austenite Grain Growth
Crystal grain improves the room temperature and elevated temperature strength of steel.V can promote ferritic formation, moreover it is possible to fining ferrite lath.Vanadium carbide nitride
Relatively high solubility is far below vanadium carbide plus the solubility of vanadium nitride, so that vanadium becomes, one kind is easy to control and it has by force
The element of strong precipitation enhancement, because the difference of VN and VC solubility makes N become an important microalloying in vanadium steel
Element, it largely determines the density of precipitate and its precipitation strength effect in steel.Dissolution of the nitrogen in ferrite
Degree is higher than carbon, and before V (C, N) precipitation, all nitrogen is usually all dissolved in ferrite and summarizes in steel, and carbon is due to austenite/iron
Ferritic or the balanced action of ferrite/cementite and only very small part is dissolved in ferrite.Therefore, by accurately controlling nitrogen
Content can facilitate the precipitation strength of control V (C, N), therefore, steel of the present invention control V range is 0.27~0.45%.
N: the N in steel is mainly added in steel in the form of intermediate alloy.N main compound shape in the form of V (CN) in steel
Formula exists.When effect of the N in steel is mainly austenite to ferritic transformation, the precipitated phase of VN or V (CN), suppression are precipitated from steel
Growing up for austenite grain processed, plays the role of fining ferrite grains.N element is the major impetus and reinforcing that V (CN) is precipitated
Element, but excessive N can make the precipitation strength of steel grade act on enhancing, damage to the low-temperature impact toughness and fracture toughness of steel plate
Evil, therefore N element is controlled 0.010~0.020%.
Al: Al content of the invention is selected 0.020% hereinafter, Al determines oxygen agent as deoxidation, be not intended as in steel-making
Refine the element of crystal grain.If but dosage is excessive when in steel-making as deoxidier, will make to generate a large amount of Al in steel2O3It is mingled with,
So that the degraded toughness of steel.
For the constraint condition of chemical component: 3≤V/C≤4, the purpose is to V elements to form V with the C in steel, N element
(CN) except, also by extra C element with the carbide individualism of VC, to reduce the cementite content in steel；For at
Divide 1.2≤V/ of constraint condition (C+Si)≤3, the content of pearlite in alloy in steel will be further constrained, to reduce tough to the low temperature of steel
The detrimental effect of property.
Compared with prior art, the invention has the following advantages that
First, steel mechanical property produced by the present invention is excellent, and yield strength >=430MPa, elongation percentage >=23%, and have
Good welds performance,
Second, lateral -150 DEG C of KV of steel plate of the present invention2>=80J, -60 DEG C of CTOD δ m >=0.60mm of steel plate have excellent
Low-temperature flexibility；Metallographic structure is ferrite+pearlite fine-grained steel, ratio of ferrite >=75% and pearlite ratio≤
25%, ferrite grain size reaches 12~15 grades.Hardness of steel high and low temperature impact flexibility of the present invention is good, mentions for low-temperature pressure container
A kind of excellent making material has been supplied, has been not only advantageous to improve the technical level of low-temperature pressure container, is low-temperature pressure container
Enlargement and lightweight are laid a good foundation, and can increase substantially the delivery efficiency and economic effect of China's transportable pressure vessel
Benefit.Steel of the present invention can be widely applied to the industries such as petroleum, petrochemical industry, chemical industry and highway, tank car, before wide application
Scape.
Third, the present invention abandons Traditional Thinking, using the steel grades for being free of Ni, guaranteeing steel mechanical property and low temperature properties
Under the premise of energy, the production cost of steel is reduced, also avoids that the slab of the steel containing Ni is easy to form when heated to be difficult to remove
The phenomenon that dense oxide iron sheet, optimize rolling mill practice；Steel Preparation Method simple process of the present invention, operates conveniently.
Detailed description of the invention
Fig. 1 is the metallurgical structure figure of steel made from embodiment 6.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing, convenient for more clearly understanding the present invention, but they
Limiting the invention.
Examples 1 to 7 produces steel according to the following steps:
1) vanadium micro-alloying, the heating of ladle furnace bottom nitrogen blowing are realized through converter smelting, gas inclusions is removed in vacuo and controlled
The horizontal of N content realizes v n micro alloying in steel, after being casting continuously to form base, heats to slab, control heating temperature 1170~
1250 DEG C, the control rate of heat addition is 8~14min/cm；
2) hot rolling is carried out, control start rolling temperature is not less than 1000 DEG C, controls the accumulative reduction ratio of last three passage and is not less than
30%；It controls finishing temperature and is not less than 840 DEG C；
3) it is heat-treated using normalizing process, controls normalizing temperature at 930~1000 DEG C, and keep the temperature, soaking time: 20
~40 minutes+plate thickness × 1 minute/mm in millimeters.
Wherein, table 1 is Examples 1 to 7 and comparative example chemical component value (wt, %).Table 2 is Examples 1 to 7 and comparison
Example main technologic parameters list.Table 3 is Examples 1 to 7 and the list of comparative example mechanical property.
Table 1
Table 2
Table 3
As can be seen from Table 3, the mechanical property and cryogenic property of steel made from Examples 1 to 7 are excellent, yield strength
>=435MPa, tensile strength >=580MPa, elongation percentage >=23%, lateral -60 DEG C of KV of steel plate2>=85J, -60 DEG C of CTOD δ of steel plate
M >=0.65mm meets high-strength and high/low temperature toughness cryogenic steel requirement.From attached drawing 1 as can be seen that steel metallographic structure of the present invention
Uniformly, crystal size is small, and metallographic structure is ferrite+pearlite fine-grained steel, ratio of ferrite >=75% and pearlite ratio
Example≤25%, ferrite grain size are 12 grades.
Claims (10)
1. a kind of high tenacity steel plate for low temperature pressure container, it is characterised in that: the chemical component and its weight percent of steel are as follows:
C:0.090~0.130%, Si≤0.15%, Mn:1.40~1.80%, P≤0.012%, S≤0.004%, V:0.27~
0.45%, N:0.010~0.020%, Alt≤0.020%, remaining is Fe and is inevitably mingled with, and meets simultaneously: 3≤V/C
≤ 4,1.2≤V/ (C+Si)≤3；The manufacturing method of the high tenacity steel plate for low temperature pressure container, including smelt, continuous casting adds
Heat, rolling, heat treatment step, the heating stepses, heating temperature are 1100~1260 DEG C, and the rate of heat addition is 8~14min/cm；
The milling step carries out hot rolling, controls 1000 DEG C of start rolling temperature >, controls last three passage and adds up reduction ratio > 30%；Control
840 DEG C of finishing temperature > processed, compression ratio >=15；The heat treatment step, is heat-treated using normalizing process, controls normalizing temperature
Degree is 930~1000 DEG C, and is kept the temperature.
2. high tenacity steel plate for low temperature pressure container according to claim 1, it is characterised in that: the chemical component of steel and its again
It is as follows to measure percentage: C:0.090~0.130%, Si:0.03~0.15%, Mn:1.55~1.80%, P:0.005~
0.012%, S:0.001~0.004%, V:0.27~0.45%, N:0.010~0.017%, Alt:0.004~0.018%,
Remaining is Fe and is inevitably mingled with, and meets simultaneously: 3≤V/C≤4,1.2≤V/ (C+Si)≤3.
3. high tenacity steel plate for low temperature pressure container according to claim 1, it is characterised in that: the chemical component of steel and its again
It is as follows to measure percentage: C:0.090~0.115%, Si:0.12~0.15%, Mn:1.65~1.75%, P:0.008~
0.012%, S:0.001~0.004%, V:0.27~0.43%, N:0.010~0.013%, Alt:0.004~0.008%,
Remaining is Fe and is inevitably mingled with, and meets simultaneously: 3≤V/C≤4,1.2≤V/ (C+Si)≤3.
4. the manufacturing method of high tenacity steel plate for low temperature pressure container described in a kind of claim 1, including smelt, continuous casting, heating,
Rolling, heat treatment step: it is characterized by: the heating stepses, heating temperature is 1100~1260 DEG C, the rate of heat addition is 8~
14min/cm；The milling step carries out hot rolling, controls 1000 DEG C of start rolling temperature >, controls last three passage and adds up reduction ratio
> 30%；840 DEG C of finishing temperature > of control, compression ratio >=15；The heat treatment step, is heat-treated using normalizing process,
Controlling normalizing temperature is 930~1000 DEG C, and is kept the temperature.
5. the manufacturing method of high tenacity steel plate for low temperature pressure container according to claim 4, it is characterised in that: in the smelting
It refines in step, first realizes vanadium micro-alloying through smelting, then control N content in steel and realize v n micro alloying.
6. the manufacturing method of high tenacity steel plate for low temperature pressure container according to claim 4, it is characterised in that: at the heat
Manage step, soaking time are as follows: 20~40 minutes+steel plate thickness (mm) × 1 minutes/mm.
7. according to claim 4 or 5 or the manufacturing method of the 6 high tenacity steel plate for low temperature pressure container, it is characterised in that: institute
Milling step is stated, roughing start rolling temperature is 1080~1150 DEG C, and reduction in pass is 15~24mm, finish rolling finishing temperature 855
~890 DEG C, it is 26~45% that last three passages, which add up reduction ratio,.
8. according to claim 4 or 5 or the manufacturing method of the 6 high tenacity steel plate for low temperature pressure container, it is characterised in that: institute
Milling step is stated, roughing start rolling temperature is 1080~1110 DEG C, and reduction in pass is 15~20mm, finish rolling finishing temperature 855
~880 DEG C, it is 26~40% that last three passages, which add up reduction ratio,.
9. according to claim 4 or 5 or the manufacturing method of the 6 high tenacity steel plate for low temperature pressure container, it is characterised in that: institute
Heat treatment step is stated, control normalizing temperature is 930~945 DEG C.
10. according to claim 4 or 5 or the manufacturing method of the 6 high tenacity steel plate for low temperature pressure container, it is characterised in that:
The heating stepses, heating temperature are 1215~1240 DEG C.
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| CN109881094B (en) * | 2019-03-12 | 2020-12-29 | 武汉钢铁有限公司 | Pressure vessel steel with excellent low-temperature impact property and yield strength of not less than 480MPa and production method thereof |
| CN109868414B (en) * | 2019-03-12 | 2020-12-29 | 武汉钢铁有限公司 | Pressure vessel steel with excellent low-temperature impact property and yield strength of more than or equal to 430MPa and production method thereof |
| CN111850401B (en) * | 2020-07-07 | 2021-07-20 | 鞍钢股份有限公司 | Low-cost high-strength and high-toughness pressure vessel steel plate and production method thereof |
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