CN107937804A - High tenacity steel plate for low temperature pressure container and its manufacture method - Google Patents
High tenacity steel plate for low temperature pressure container and its manufacture method Download PDFInfo
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- CN107937804A CN107937804A CN201711139402.XA CN201711139402A CN107937804A CN 107937804 A CN107937804 A CN 107937804A CN 201711139402 A CN201711139402 A CN 201711139402A CN 107937804 A CN107937804 A CN 107937804A
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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 composition and its percentage by weight 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, and meets at the same time：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 maximization and lightweight of low-temperature pressure container, and 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 manufacture method.
Background technology
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 carry 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 and material mechanical of low temperature compel and physical property restricted.
Thus, understand the special nature of material under low temperature, possess their physical data, correctly select suitable cryogenic material, be to grind
System and design cryogenic mechanical, ensure its reliably enduringly essential condition of safe operation.In order to ensure the safety fortune of Cryo Equipment
OK, the metal material for manufacturing Cryo Equipment must have enough plasticity and toughness at low temperature, and have higher machinery by force
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 stores up
The medium of fortune is liquid 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 used more 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, and delivery efficiency is low.
Nickel is non-carbide formation element, it and carbon effect do not form carbide, but form α and γ solid solution, nickel with iron
The increase of content, the stability increase of austenite, therefore nickel is the element to be formed with stable austenite, nickel is the low temperature for improving steel
Toughness, reduce 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 steel containing Ni higher, there are problems with for nickel system low-temperature steel：1) Ni is a kind of compared with noble element, about 280000 yuan/ton, is increased
Cost；2) strand of the steel containing Ni easily forms the dense oxide iron sheet for being difficult to remove when heated, gives heating rolling process band
Come difficult.Therefore production technology that is inexpensive and can guarantee that good low-temperature flexibility is explored to become as low-temperature (low temperature) vessel microalloy
High-strength steel technical problem urgently to be resolved hurrily.
China Patent Publication No. be CN 101497961B patent document, disclose a kind of low-temperature flexibility 1.5Ni steel and its
Manufacture method, the weight percent proportioning of its chemical composition are：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 more than 400MPa, tensile strength
More than 500MPa, 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 that higher Ni contents are used in component, and heat treatment process uses twice heat treatment process, the two promotes the production of steel plate
Cost increase, and the intensity of steel plate and yield tensile ratio cannot meet 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 made of the component of following weight percentage：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 containing 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 manufacture method is applied in casting billet surface
Antioxidizing paint is applied, is rolled using cooling controlling and rolling controlling process, normalizing+tempering heat treatment process is produced with stable and excellent
- 110 DEG C of low-temperature flexibilities low-temperature tough steel, contain 3.5%Ni in the component of the steel so that the cost of steel drastically raises, and adopts
With twice heat treatment process, production cost is added.
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 manufacture method, the chemical composition of steel plate is by weight
Percentage is 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 manufacture method is:Using the molten iron Jing Guo desulfurization pretreatment and steel scrap as raw material, by converter
It is low that the process such as smelting, LF refining, RH application of vacuum, continuous casting, heating, rolling and cooling, normalizing heat treatment obtains -70 DEG C of normalizing types
Warm steel plate of pressure vessel.Its advantage is:Yield strength is more than 380MPa, has good plasticity, excellent -70 DEG C of low-temperature impacts
Toughness, can be widely used for the low-temperature pressure container equipment such as manufacture liquid chlorine storage tank, elevated pressure nitrogen storage tank, ammonia cooler.The component of the steel
In contain 0.5%Ni so that the cost of alloy of steel improves, and using twice heat treatment process, adds production cost, and lower
At a temperature of cannot meet 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
Method is made, the chemical composition of steel plate is C by weight percentage：0.145%~0.185%, 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 manufacture method is:Using the molten iron Jing Guo desulfurization pretreatment and steel scrap as raw material, by converter smelting, LF refining,
The process such as RH application of vacuum, continuous casting, heating, rolling and cooling, normalizing+tempering heat treatment obtains -40 DEG C of normalizing type low-temperature pressures
Tank plate.The shortcomings that steel be steel medium pearlite Content more than 25%, low-temperature impact toughness can only meet -40 DEG C
KV2Requirement, ＜ -70 DEG C of low-temperature flexibility cannot meet 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 composition of steel plate is C by weight percentage：0.145%~0.185%, 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 manufacture method is：Using the molten iron Jing Guo desulfurization pretreatment and steel scrap as raw material, by converter smelting, LF refining,
The process such as RH application of vacuum, continuous casting, heating, rolling and cooling, normalizing+tempering heat treatment obtains -40 DEG C of normalizing type low-temperature pressures
Tank plate.The shortcomings that steel be steel medium pearlite Content more than 25%, low-temperature impact toughness can only meet -40 DEG C
KV2Requirement, but contain Ni in steel, and use twice heat treatment process, increase manufacture cost.
Chinese patent CN201210253970.3 disclose a kind of yield strength 460MPa grades of normalizing high strength steel plates and its
Manufacture method, its chemical composition are C by weight percent：0.14%~0.20%, Si：0.20%~0.60%, Mn：1.20%
~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%, its surplus are iron Fe and inevitable impurity.The present invention by controlled rolling ten just
Ignition technique, is heated to 1210~1240 DEG C, heating total time was controlled by 1.0~1.2 minutes/mm by continuous casting billet；Using two benches
Rolling, the start rolling temperature of Unhydrated cement require to control at 850~920 DEG C, and finishing temperature requires control at 780~840 DEG C；Roll
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, stable quality, performance are good, production cost is low.The shortcomings that steel be steel medium pearlite Content more than 25%, it is low
Warm impact flexibility can only meet -40 DEG C of KV2Requirement, it is impossible to meet the requirement of -70 DEG C of temperature below cryogenic steel.
The content of the invention
Present invention aim to provide a kind of high tenacity steel plate for low temperature pressure container and its manufacture method, the steel is strong
Degree is high, and low-temperature impact toughness is good, and cost is low.
To achieve the above object, the technical solution adopted by the present invention is：A kind of high tenacity steel plate for low temperature pressure container, steel
Chemical composition and its percentage by weight it is as follows：C：0.090~0.130%, Si≤0.15%, Mn：1.40~1.80%, P≤
0.012%th, 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 at the same time：3≤V/C≤4,1.2≤V/ (C+Si)≤3.
Further, the chemical composition of steel and its percentage by weight are as follows：C：0.090~0.130%, Si：0.03~
0.15%th, 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 at the same time：3≤V/C≤
4,1.2≤V/ (C+Si)≤3.
Further, the chemical composition of steel and its percentage by weight are as follows：C：0.090~0.115%, Si：0.12~
0.15%th, 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 at the same time：3≤V/C≤
4,1.2≤V/ (C+Si)≤3.
A kind of manufacture method of above-mentioned high tenacity steel plate for low temperature pressure container, including smelt, continuous casting, heat, rolling, heat
Processing step：It is characterized in that：The heating stepses, heating-up temperature are 1100~1260 DEG C, and the rate of heat addition is 8~14min/
cm；The milling step, carries out hot rolling, 1000 DEG C of control start rolling temperature ＞, controls last three passage to add up reduction ratio ＞ 30%；
Control 840 DEG C of finishing temperature ＞, 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, first vanadium micro-alloying is realized through smelting, then control N content in steel real
Existing v n micro alloying.
Further, the heat treatment step, soaking time are：20~40 minutes+(steel plate thickness) mm × 1 minute/mm.
Further, the milling step, roughing start rolling temperature are 1080~1150 DEG C, reduction in pass for 15~
24mm, finish rolling finishing temperature are 840~890 DEG C, and last three passages add up reduction ratio as 26~45%.
Further, the milling step, roughing start rolling temperature are 1080~1110 DEG C, reduction in pass for 15~
20mm, finish rolling finishing temperature are 840~880 DEG C, and last three passages add up reduction ratio as 26~40%.
Further, the heat treatment step, it is 930~945 DEG C to control normalizing temperature.
Further, the heating stepses, heating-up 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 one of indispensable 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 is returned and declined.Carbon contains
Often increase can improve tensile strength to amount.Mn/C ratios are higher, bigger to the casting aliquation influence degree of steel, so considering
Under the conditions of the composite factor that the casting aliquation that influences and Mn/C of the C to the obdurability of steel compare steel influences, C content in steel is controlled to exist
0.09~0.13%.
Si：Si can reduce the graphitization tendency of carbon in steel, and the intensity of steel is 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, which has the intensity for improving low-carbon and middle carbon pearlitic steel, significantly to be acted on.It is, in general, that Mn contents are 2%
It is favourable to the toughness for improving weld metal 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 promoting crystal grain to grow up, quicker to overheating
Sense, therefore Mn contents are within 1.40~1.80% in control steel.
P、S:Since P, S content in steel must be controlled in relatively low scope, clean steel is only smelted, just can guarantee that this hair
The performance of bright steel, therefore, control P≤0.012%, S≤0.004%.
V：V is strong carbonitride-forming elements, it is refined by 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
Of a relatively high solubility is far below vanadium carbide plus the solubility of vanadium nitride so that vanadium is easy to control as one kind and it has by force
The element of strong precipitation enhancement, because the difference of VN and VC solubility causes N to become an important microalloying in vanadium steel
Element, it largely determines the density of precipitate and its precipitation strength effect in steel.Dissolving of the nitrogen in ferrite
Degree is higher than carbon, and before V (C, N) precipitations, all nitrogen is usually all dissolved in ferrite and collects in steel, and carbon is due to austenite/iron
The balanced action of ferritic or ferrite/cementite and only very small part is dissolved in ferrite.Therefore, by accurately controlling nitrogen
Content can conveniently control V (C, N) precipitation strength, therefore, steel of the present invention control V scopes as 0.27~0.45%.
N：N in steel is mainly added in steel in the form of intermediate alloy.N main compound shapes in the form of V (CN) in steel
Formula exists.Effects of the N in steel be mainly austenite to ferritic transformation when, from steel separate out VN or V (CN) precipitated phase, suppression
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 separated out
Element, but excessive N can make the precipitation strength of steel grade act on enhancing, and the low-temperature impact toughness and fracture toughness of steel plate are damaged
Evil, therefore N element is controlled 0.010~0.020%.
Al：The Al content of the present invention is selected below 0.020%, and Al determines oxygen agent as deoxidation, be not intended as in steel-making
The element of crystal grain thinning.But if dosage is excessive when in steel-making as deoxidier, will make to produce substantial amounts of Al in steel2O3It is mingled with,
So that the degraded toughness of steel.
For the constraints of chemical composition：3≤V/C≤4, the purpose is to V element to form V with the C in steel, N element
(CN) outside, also by unnecessary C element with the carbide individualism of VC, so as to reduce the cementite content in steel；For into
Divide 1.2≤V/ of constraints (C+Si)≤3, the content of pearlite in alloy in steel will be further constrained, so as to reduce tough to the low temperature of steel
The detrimental effect of property.
Compared with prior art, the present invention has the following advantages：
First, steel mechanical property produced by the present invention is excellent, and yield strength >=430MPa, elongation percentage >=23%, and have
Good welds performance,
Second, horizontal -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, is carried for low-temperature pressure container
A kind of excellent making material has been supplied, has been not only advantageous to improve the technical merit of low-temperature pressure container, has been low-temperature pressure container
Maximization and lightweight are laid a good foundation, and can increase substantially the delivery efficiency of China's transportable pressure vessel and economic effect
Benefit.Steel of the present invention can be widely applied to the industries such as oil, petrochemical industry, chemical industry and highway, tank car, before having wide application
Scape.
Third, the present invention abandons Traditional Thinking, using the steel grades without Ni, ensureing steel mechanical property and low temperature properties
On the premise of energy, the production cost of steel is reduced, it also avoid the strand of the steel containing Ni and easily formed when heated to be difficult to what is removed
The phenomenon of dense oxide iron sheet, optimizes rolling mill practice；Steel Preparation Method technique of the present invention is simple, operation facility.
Brief description of the drawings
Fig. 1 is the metallurgical structure figure of steel made from embodiment 6.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, easy to more clearly understand the present invention, but they
The present invention is not formed and limited.
Embodiment 1~7 produces steel according to 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 level of N content realizes v n micro alloying in steel, after being casting continuously to form base, to heating strand, control heating-up temperature 1170~
1250 DEG C, it is 8~14min/cm to control the rate of heat addition；
2) hot rolling is carried out, control start rolling temperature is not less than 1000 DEG C, controls last three passage to add up reduction ratio and is not less than
30%；Finishing temperature is controlled to be not less than 840 DEG C；
3) it is heat-treated using normalizing process, control normalizing temperature is kept the temperature, soaking time at 930~1000 DEG C：20
~40 minutes+thickness of slab × 1 minute/mm in units of millimeter.
Wherein, table 1 is embodiment 1~7 and comparative example chemical composition value (wt, %).Table 2 is embodiment 1~7 and contrast
Example main technologic parameters list.Table 3 is embodiment 1~7 and comparative example mechanical property list.
Table 1
Table 2
Table 3
As can be seen from Table 3, the mechanical property of steel and cryogenic property are excellent made from embodiment 1~7, yield strength
>=435MPa, tensile strength >=580MPa, elongation percentage >=23%, horizontal -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, its 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)
- A kind of 1. high tenacity steel plate for low temperature pressure container, it is characterised in that：The chemical composition and its percentage by weight 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%th, N：0.010~0.020%, Alt≤0.020%, remaining is Fe and is inevitably mingled with, and meets at the same time：3≤V/C ≤ 4,1.2≤V/ (C+Si)≤3.
- 2. high tenacity steel plate for low temperature pressure container according to claim 1, it is characterised in that：The chemical composition 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%th, 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 at the same time：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 composition 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%th, 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 at the same time：3≤V/C≤4,1.2≤V/ (C+Si)≤3.
- 4. the manufacture 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 in that：The heating stepses, heating-up temperature are 1100~1260 DEG C, the rate of heat addition for 8~ 14min/cm；The milling step, carries out hot rolling, 1000 DEG C of control start rolling temperature ＞, controls last three passage to add up reduction ratio ＞ 30%；Control 840 DEG C of finishing temperature ＞, compression ratio >=15；The heat treatment step, is heat-treated using normalizing process, It is 930~1000 DEG C to control normalizing temperature, and is kept the temperature.
- 5. the manufacture method of high tenacity steel plate for low temperature pressure container according to claim 4, it is characterised in that：In the smelting Refine in step, first realize vanadium micro-alloying through smelting, then control N content in steel to realize v n micro alloying.
- 6. the manufacture method of high tenacity steel plate for low temperature pressure container according to claim 4, it is characterised in that：At the heat Step is managed, soaking time is：20~40 minutes+(steel plate thickness) mm × 1 minute/mm.
- 7. according to the manufacture method of the 4 or 5 or 6 high tenacity steel plate for low temperature pressure container of claim, it is characterised in that：Institute State milling step, roughing start rolling temperature is 1080~1150 DEG C, and reduction in pass is 15~24mm, finish rolling finishing temperature 840 ~890 DEG C, last three passages add up reduction ratio as 26~45%.
- 8. according to the manufacture method of the 4 or 5 or 6 high tenacity steel plate for low temperature pressure container of claim, it is characterised in that：Institute State milling step, roughing start rolling temperature is 1080~1110 DEG C, and reduction in pass is 15~20mm, finish rolling finishing temperature 840 ~880 DEG C, last three passages add up reduction ratio as 26~40%.
- 9. according to the manufacture method of the 4 or 5 or 6 high tenacity steel plate for low temperature pressure container of claim, it is characterised in that：Institute Heat treatment step is stated, it is 930~945 DEG C to control normalizing temperature.
- 10. according to the manufacture method of the 4 or 5 or 6 high tenacity steel plate for low temperature pressure container of claim, it is characterised in that： The heating stepses, heating-up temperature are 1215~1240 DEG C.
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