CN106467951B - For -70 DEG C of high intensity, high tenacity, low yield strength ratio low-temperature steel and its manufacturing method - Google Patents
For -70 DEG C of high intensity, high tenacity, low yield strength ratio low-temperature steel 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention discloses a kind of for -70 DEG C of high tenacity, low yield strength ratio low-temperature steel and its manufacturing method, the low-temperature steel chemical component weight percentage are as follows: C:0.05~0.20, Si≤0.30, Mn:0.85~1.50, P≤0.005, S≤0.003, Alt:0.015~0.050, Ni:0.35~0.70, N≤0.004, additionally contain Mo≤0.10, Nb≤0.05, Ti≤0.025, any one or a few in Ca≤0.005, surplus are Fe and are inevitably mingled with.The low-temperature steel is prepared by process for making, steel rolling process and processing, the big technique of heat treatment process three, the present invention controls C, Mn constituent content in terms of composition design, to reduce steel plate yield tensile ratio, adding a certain amount of Ni element guarantees its low-temperature impact toughness simultaneously, adding the microalloy elements such as a certain amount of Ti, Mo, Nb improves its welding performance simultaneously, strict control P, S, N content, and Ca-Si processing is carried out, enable the steel that there is lower yield tensile ratio simultaneously with excellent low-temperature flexibility.
Description
Technical field
The present invention relates to steel alloy manufacturing fields, in particular to a kind of high tenacity for -70 DEG C, low yield strength ratio low-temperature steel
And its manufacturing method.
Background technique
Yield tensile ratio is the ratio of material yield strength and tensile strength, and steel have lower yield tensile ratio can be serious
Under load deformation, the non-deformability of steel is improved, i.e. yield tensile ratio is lower, and material is from plastic deformation is started to required for fracture
Deformation can be bigger, to improve the ability of its anti-large deformation, safety can be effectively ensured.But in LPG ship and LPG storage tank
In the application of material, since it has reached -70 DEG C using temperature, not only to the yield tensile ratio of material, there are strict requirements, to steel
Low-temperature flexibility also has high requirement, and therefore, it is necessary to rationally guarantee the matching of yield tensile ratio and low-temperature flexibility to adapt to market pair
The requirement of the type steel grade.
Currently, there has been no the special low yield strength ratio low temperature steel grades for this application in the market.Publication No.
The Chinese invention patent of CN103774050 proposes a kind of low yield strength ratio high-ductility steel, component and content are as follows: and C:0.07~
0.09%, Si:0.15~0.20%, Mn:1.30~1.50%, P :≤0.008%, S :≤0.004%, Ti:0.010~
0.015%, Cr:0.10~0.20%, Ni:0.15~0.20%, Cu:0.20~0.25%, Al:0.025~0.030% are remaining
Amount is Fe and inevitable impurity.The steel has low yield tensile ratio, preferable plasticity, but is mainly used for normal temperature environment, does not relate to
And it is used at -70 DEG C.The Chinese invention patent of Publication No. CN103122436 proposes a kind of -70 DEG C of normalizings used
Type steel for low-temperature pressure container, ingredient and composition are as follows: for 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 are Fe and inevitable impurity.The steel is obtained through processes such as normalizing heat treatments
To -70 DEG C of normalizing type low-temperature pressure vessel steel plates, it can be used for manufacturing -70 DEG C of cryogenic pressure vessel equipments, but yield tensile ratio is higher,
More than 0.72.The Chinese invention patent of Publication No. CN103014554 discloses a kind of low-yield ratio pipeline steel, composition quality hundred
Divide ratio are as follows: C:0.05~0.08%, Si:0.15~0.30%, Mn:1.55~1.85%, P≤0.015%, S≤0.005%,
Al:0.015~0.04%, Nb:0.015~0.025%, Ti:0.01~0.02%, Cr:0.20~0.40%, Mo:0.18~
0.30%, N :≤0.006%, O≤0.004%, Ca≤0.005%, Ni≤0.40%, wherein Ca/s >=1.5, surplus are iron
With inevitable impurity.Its yield strength in 500MPa or more, yield tensile ratio 0.70 or more, be mainly used for earthquake district occurred frequently and
Anti- big strain feed-line steel pipe.
Summary of the invention
The object of the present invention is to provide a kind of for -70 DEG C of high tenacity, low yield strength ratio low-temperature steel and its manufacturing method,
The low-temperature steel can overcome existing steel grade yield tensile ratio higher, and low-temperature flexibility matches bad problem with yield tensile ratio, using feasible life
Production. art is suitble to mass production operation, obtains the steels for pressure vessel use of good low-temperature flexibility, tensile property.
To achieve the above object, provided by the invention a kind of for -70 DEG C of high intensity, high tenacity, low yield strength ratio low temperature
Steel, the low-temperature steel chemical component weight percentage are as follows: C:0.05~0.20, Si≤0.30, Mn:0.85~1.50, P≤
0.005, Mo≤0.10, Nb are additionally contained in S≤0.003, Alt:0.015~0.050, Ni:0.35~0.70, N≤0.004
≤ 0.05, Ti≤0.025, any one or a few in Ca≤0.005, surplus is Fe and is inevitably mingled with.
Further, the chemical component weight percentage of the low-temperature steel are as follows: C:0.05~0.15, Si:0.01~0.20,
Mn:0.85~1.50, P≤0.005, S≤0.003, Alt:0.015~0.050, Ni:0.40~0.70, Nb:0.02~0.05,
Ti:0.008~0.025, N≤0.004, Ca:0.002~0.005, surplus are Fe and are inevitably mingled with.
Still further, the chemical component weight percentage of the low-temperature steel are as follows: C:0.05~0.12, Si:0.15~
0.30, Mn:0.85~1.20, P≤0.005, S≤0.003, Alt:0.015~0.050, Ni:0.40~0.70, N≤0.004,
Mo≤0.10, Ca:0.002~0.005, surplus are Fe and are inevitably mingled with.
Still further, the low-temperature steel with a thickness of 10~50mm, yield strength is 370MPa rank, and yield tensile ratio is low
In 0.65, low-temperature steel ballistic work under -70 DEG C of cryogenic conditions is higher than 150J.
The present invention provides a kind of for -70 DEG C of high intensity, high tenacity, the preparation method of low yield strength ratio low-temperature steel, should
Low-temperature steel is prepared by process for making, steel rolling process and processing, the big technique of heat treatment process three,
1) process for making: deep desulfuration is carried out using molten iron K-S desulfurization technology, and carries out converter top bottom blowing, LF
Ca-Si processing is carried out in heating furnace, carries out vacuum processing and trimming in RH vacuum drying oven；
2) rolling mill practice: slab heating temperature is 1260~1300 DEG C before rolling, and applies inoxidzable coating in casting billet surface, adds
Hot rate be 8~13min/cm, roughing use two-phase control rolling, roughing one stage start rolling temperature be not less than 1200 DEG C, then into
Row is not less than 1100 DEG C to temperature, roughing two-stage rolling temperature；70~100mm of workpiece thickness, finish rolling start rolling temperature are not more than
940 DEG C, finish rolling finishing temperature is 760~880 DEG C；
3) processing, heat treatment process: according to steel plate thickness difference, which carries out normalizing+tempering heat treatment, technique system
Degree see the table below 1
1 heat treating regime of table
Theoretical basis of the invention
1, the reasons why chemical component (C, Si, Mn, P, S, Alt, Ni, Ti, Mo, Nb, Ca) limited amount
Because the steel grade requires have excellent low-temperature flexibility at -70 DEG C, therefore, when steel-making, wants the pure of strict control molten steel
Cleanliness prevents the influence of P, S and other impurities element to the steel low-temperature flexibility.Being designed to of Mn, Nb, Ti, Ni point ensure that steel
Intensity, toughness and welding performance, wherein Ni alloy be mainly used to improve steel low-temperature flexibility, Ti alloy can refine steel plate weldering
Heat affected zone organization is connect, toughness levels are improved, the stability after steel plate SR can be improved in Mo.By adjusting C, Mn etc. to strong
The content of sensitive elements is spent to control its yield tensile ratio；P≤0.005%, S≤0.003% are set, and N≤0.004% is mainly examined
Consider these elements to be affected to the steel low-temperature flexibility, strictly to limit its content.
(1) influence of the alloying element to steel cryogenic property
C is to improve the most effective element of steel strength, with the increase of C content, Fe in steel3C increases, and hardenability also increases
Add, the tensile strength and yield strength of steel improve.But increase C content in steel, the elongation percentage and impact toughness decreased of steel, especially
It is affected to low-temperature flexibility.Simultaneously as the influence of C element gap solution strengthening, content, which increases, easily makes steel Qu Qiang
Than increasing, therefore its content is designed lower than 0.20%.
The affinity of Si and carbon is very weak, the not carburet in steel, but can dissolve in ferrite, generates solution strengthening effect,
So that ferritic intensity and hardness improve, but plasticity and toughness are declined, and are related to that it is strong to surrendering according to Pikering
The influence of degree is higher, and content is unsuitable excessively high, therefore the Si content of steel of the present invention controls within 0.30%.
Mn is the one of the chief elements for improving the yield strength and tensile strength of steel, is related to it to surrender according to Pikering
The influence of intensity is equally larger, meanwhile, Mn element is a kind of element being easily segregated, when line of segragation Mn, C content reach certain proportion
When, martensitic phase can be generated in steel production and welding process, this, which is met, shows very high hardness, to steel plate low-temperature flexibility
There is larger impact with resistance against hydrogen cracking performance.Therefore, comprehensively consider and Mn content is limited in 0.40%~1.50% range.
Al is the main deoxidant element in steel, and the Al of certain content can also refine the crystal grain of steel plate, improve the intensity of steel plate
And toughness.But when Al content is higher, easily leads to be mingled in steel and increase, it is unfavorable to the toughness of steel, while quenching for steel can be reduced
Hardness and toughness, reduce the resistance against hydrogen cracking performance of steel.Therefore by Alt content control in steel of the present invention 0.015%~
Within 0.050%.
Ni can mutually melt in any proportion with iron, improve the low-temperature flexibility of steel by fining ferrite grains, can be obvious
Reduce the low temperature ductile-brittle transition temperature of steel plate.For -70 DEG C of requirement, Ni content is set in 0.40% by steel of the present invention~
0.70%.
Ti is a kind of strong carbide and nitride forming element, and the particles such as TiN, Ti (CN) of formation are highly stable,
Effectively crystal grain can be prevented to grow up in forming core, therefore crystal grain can be refined, improve the intensity and toughness of steel plate.Steel plate is welding
The effect of Ti is also obvious when connecing, and can effectively refine welding heat affected zone tissue.Consider steel plate low-temperature flexibility require and it is right
The influence of welding performance, control is within 0.025% when designing the content of Ti.
Mo is the element for effectively improving steel plate temper resistance, can be improved armor plate strength and resistance against hydrogen cracking performance.Such as
Fruit adding too much will lead to the decline of steel plate low-temperature flexibility, and therefore, steel Mo content control of the present invention is within 0.35%.
Nb is a kind of carbide, and Second Phase Particles such as NbC, Nb (CN) are formed in steel, hinders austenite
Crystal grain is grown up, and is refined crystal grain, is improved the intensity and low-temperature flexibility of steel plate.But intercrystalline crack is also easy to produce when its too high levels, and
Cause the rising of yield tensile ratio.Therefore, comprehensively consider and control Nb content of the invention within 0.05%.
Ca is that steel carries out increased element when Ca-Si processing, and element itself is to plate property without obvious when content is not high
It influences, but after Ca-Si is handled, steel inclusion appearance changes, size reduction, Oxygen potential improves, and is conducive to steel
Hydrogen sulfide corrosion resistance energy.But in view of impurity element increases in steel after Ca-Si processing, therefore, additional amount be should not be too large, the steel
The control of Ca content is within 0.005% after handling.
(2) influence of impurity element and gas to steel cryogenic property
Low-temperature pressure vessel steel will ensure the use in low temperature environment.Impurity element and gas in steel is to the low of steel plate
Warm toughness is affected, therefore wants possible reduction.
P in steel in addition to formed steel can be caused red crisp (hot-short) and plasticity reduction meltable eutectic field trash other than, also to hydrogen
Atom reconfigures process and plays inhibiting effect, so that steel hydrogenation effect increases, to improve the brittleness of steel, reduces low-temperature flexibility water
Gentle resistance against hydrogen cracking performance.S too high levels can then make steel plate have anisotropy and toughness reduction, so that stablizing for steel is impatient
Play deteriorates.Therefore, which should be controlled P within 0.005%, S is controlled within 0.003%.
In addition, the steel should reduce gas content in steel to the greatest extent, reduce the segregation of steel.Meanwhile in order to reduce the timeliness shadow of steel
It rings, the content of N is controlled within 0.004%.
2, the reasons why production technology is set
(1) process for making
Carrying out Ca-Si processing in LF furnace when the steel smelting can be effectively reduced field trash by being denaturalized to field trash
Size changes the shape of field trash, is conducive to the low-temperature impact toughness and corrosion resistance that improve steel.Meanwhile by it is longer when
Between (be not less than 15min) vacuum processing, can preferably reduce impurity in steel, gas content, be conducive to the low-temperature flexibility of steel
It improves.
(2) steel rolling process
The steel alloy content is higher, is rolled by steel alloy technique.Slab heating temperature is 1260~1300 before rolling
DEG C, the rate of heat addition is 8~13min/cm, it is ensured that the uniform steel of slab temperature.Simultaneously as the presence of Ni element, billet surface are easy
Iron oxide cortex is generated, inoxidzable coating need to be smeared before slab heats.The steel billet carries out four stage rollings in rolling, i.e., slightly
Roll a stage → to temperature → roughing two-stage → centre base → to temperature → finish rolling.It is main compared with conventional low-alloy steel rolling mill practice
If roughing takes two-phase control rolling, to temperature after a stage big pressure, while ensuring to avoid mixed crystal temperature range, then carry out
Two-stage rolling, the rolling mill practice have better effects to steel plate toughness is improved.
When roughing, according to finished steel plate thickness, the thickness of intermediate base at the end of this stage rolling is controlled.When finish rolling, to temperature
After avoiding austenite fraction recrystallization zone temperature, start the controlled rolling of austenite Unhydrated cement.After finish rolling finish to gauge, deformation dislocation
Reply and polygonization will occur, so that thinning microstructure, improves the low-temperature flexibility of steel plate.When rolling, the critical point of steel is considered
Temperature avoids the occurrence of mixed crystal phenomenon.Therefore comprehensively consider, the roughing one stage start rolling temperature of steel is not less than 1200 DEG C, roughing two
Stage start rolling temperature is not less than 1100 DEG C, and finish rolling start rolling temperature is not more than 920 DEG C, and finish rolling rolls 760 DEG C~880 DEG C of finishing temperature,
Finishing pass is set in 5~9 times.
(3) processing, heat treatment process
Since the steel will be used for a long time and yield tensile ratio is lower at low ambient temperatures, so the characteristics of being directed to the steel, design heat
Treatment process is normalizing+tempering heat treatment.The tissue of the steel is a kind of more stable ferrite+pearlite group after normalizing+tempering
It knits.It is 850~950 DEG C that normalizing temperature, which separately designs, is to obtain stable tissue to allow the abundant austenitizing of steel.Tempering temperature
Degree is designed as 450~650 DEG C, is the stability in order to improve tissue, and appropriate coarsened grain is strong to bending to control refined crystalline strengthening
The influence of ratio, while armor plate strength range can also be adjusted according to different tempering temperatures.
The beneficial effects of the present invention are:
The present invention controls C, Mn constituent content in terms of composition design, to reduce steel plate yield tensile ratio, while adding a certain amount of
Ni element guarantees its low-temperature impact toughness, while adding the microalloy elements such as a certain amount of Ti, Mo, Nb and improve its welding performance,
Strict control P, S, N content, and carry out Ca-Si processing, enable the steel have simultaneously with excellent low-temperature flexibility it is lower
Yield tensile ratio.Stable soft phase ferrite+hard phase pearlitic structrure is obtained using normalizing+tempering heat treatment, utilizes phase soft in steel
Its yield tensile ratio is controlled with the difference of hard Phase Proportion.
After steel of the present invention is by ingredient design, Control and Inclusion Removal, rolling and heat treatment, lower yield tensile ratio is obtained, well
Obdurability, welding performance, can be used for manufacturing has the pressure vessel of low temperature requirement to set in the industries such as petrochemical industry, chemical fertilizer
It is standby.
Specific embodiment
In order to better explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
The contents of the present invention are not limited solely to following embodiment.
2 embodiment of the present invention of table and comparison steel grade chemical component (wt%)
The main processes of 3 embodiment of the present invention of table and comparison steel grade
The heat treatment process of 4 embodiment of the present invention of table and comparison steel grade
The mechanics inspection result of 5 embodiment of the present invention of table and comparison steel grade
As can be seen from Table 5, steel grade yield tensile ratio of the present invention is low, and low temperature impact properties are good, has excellent non-deformability
And low-temperature flexibility, and simple production process, lower production costs, steel is pure, can be used for manufacturing and uses under -70 DEG C of low temperature environments
The cryogenic pressure vessel equipment for having particular/special requirement to yield tensile ratio.
Other unspecified parts are the prior art.Although above-described embodiment is made that the present invention and retouches in detail
State, but it is only a part of the embodiment of the present invention, rather than whole embodiments, people can also according to the present embodiment without
Other embodiments are obtained under the premise of creativeness, these embodiments belong to the scope of the present invention.
Claims (3)
1. a kind of for -70 DEG C of high intensity, high tenacity, low yield strength ratio low-temperature steel, the low-temperature steel chemical component weight percentage
Than are as follows: C:0.05~0.15, Si:0.01~0.20, Mn:0.85~1.50, P≤0.005, S≤0.003, Alt:0.015~
0.050, Ni:0.40~0.70, Nb:0.02~0.05, Ti:0.008~0.025, N≤0.004, Ca:0.002~0.005, it is remaining
Amount is Fe and is inevitably mingled with；
It is characterized by: the low-temperature steel with a thickness of 10~50mm, yield strength is 370MPa rank, and yield tensile ratio is lower than
0.65, low-temperature steel ballistic work under -70 DEG C of cryogenic conditions is higher than 150J；The described low-temperature steel is by process for making, steel rolling
Technique and processing, the big technique of heat treatment process three are prepared, wherein
1) process for making: carrying out deep desulfuration using molten iron K-S desulfurization technology, and carries out converter top bottom blowing, LF heating
Ca-Si processing is carried out in furnace, carries out vacuum processing and trimming in RH vacuum drying oven；
2) rolling mill practice: slab heating temperature is 1260~1300 DEG C before rolling, in casting billet surface painting inoxidzable coating, heating
Between be 8~13min/cm, roughing use two-phase control rolling, roughing one stage start rolling temperature be not less than 1200 DEG C, then carry out to
Temperature, roughing two-stage rolling temperature are not less than 1100 DEG C；70~100mm of workpiece thickness, finish rolling start rolling temperature are not more than 940
DEG C, finish rolling finishing temperature is 760~880 DEG C；
3) processing, heat treatment process: according to steel plate thickness difference, which carries out normalizing+tempering heat treatment, and process system is shown in
Following table
Exterior heat resolving system
2. the high intensity for -70 DEG C, high tenacity, low yield strength ratio low-temperature steel according to claim 1, it is characterised in that: institute
State the chemical component weight percentage of low-temperature steel are as follows: C:0.05~0.12, Si:0.15~0.30, Mn:0.85~1.20, P≤
0.005, S≤0.003, Alt:0.015~0.050, Ni:0.40~0.70, N≤0.004, Mo≤0.10, Ca:0.002~
0.005, surplus is Fe and is inevitably mingled with.
3. high intensity, high tenacity, the preparation method of low yield strength ratio low-temperature steel described in a kind of claim 1 for -70 DEG C, this is low
Wen Gang is prepared by process for making, steel rolling process and processing, the big technique of heat treatment process three, it is characterised in that:
1) process for making: carrying out deep desulfuration using molten iron K-S desulfurization technology, and carries out converter top bottom blowing, LF heating
Ca-Si processing is carried out in furnace, carries out vacuum processing and trimming in RH vacuum drying oven；
2) rolling mill practice: slab heating temperature is 1260~1300 DEG C before rolling, in casting billet surface painting inoxidzable coating, heating
Between be 8~13min/cm, roughing use two-phase control rolling, roughing one stage start rolling temperature be not less than 1200 DEG C, then carry out to
Temperature, roughing two-stage rolling temperature are not less than 1100 DEG C；70~100mm of workpiece thickness, finish rolling start rolling temperature are not more than 940
DEG C, finish rolling finishing temperature is 760~880 DEG C；
3) processing, heat treatment process: according to steel plate thickness difference, which carries out normalizing+tempering heat treatment, and process system is shown in
Following table
Exterior heat resolving system
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| CN107974643B (en) * | 2017-11-18 | 2020-07-03 | 武汉钢铁有限公司 | -70 ℃ normalized high-strength low-yield-ratio pressure vessel steel and manufacturing method thereof |
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