CN105755369A - Easy-to-weld and low-temperature steel plate with excellent lamellar tearing resistance and manufacturing method thereof - Google Patents
Easy-to-weld and low-temperature steel plate with excellent lamellar tearing resistance and manufacturing method thereof Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
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- C21D3/06—Extraction of hydrogen
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- 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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- 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
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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Abstract
The invention relates to an easy-to-weld and low-temperature steel plate with excellent lamellar tearing resistance.The steel plate is composed of, by mass, 0.05-0.09% of C, 0.2-0.4% of Si, 0.9-1.3% of Mn, 0.02-0.04% of Al, 0.01-0.03% of Nb, 0.03-0.05% of V, 0.3-0.5% of Cr, 1.0-1.4% of Ni, 0.3-0.6% of Mo, 0.2-0.6% of Cu, 0.01-0.02% of Ti, 0.001-0.002% of B, 0.015% or below of P, 0.003% or below of S, 0.007% or below of N and the balance Fe and inevitable impurities, wherein the carbon equivalent is smaller than or equal to 0.60, and the welding crack sensitivity coefficient Pcm is smaller than or equal to 0.28.Through the process steps of KR hot metal pretreatment, converter smelting, LF refining, RH vacuum degassing, continuous casting, rolling, straightening, steel plate stack slow cooling, quench tempering and the like, high-strength, high-toughness and easy-to-weld steel plates with the thicknesses ranging from 70 mm to 100 mm are manufactured.
Description
Technical field
The present invention relates to 690MPa level medium plate technical field of forging, be specifically related to the anti-lamellar tearing of a kind of easy welding
The 690MPa level steel plate of excellent performance and manufacture method thereof.
Background technology
Pile legs of self-elevating drilling platform main chord tube is mainly welded with semi-circular plate by rack-plate, therefore, and semi-circular plate conduct
One key position of self-elevating drilling platform, does not require nothing more than and has high-intensity high-tenacity, it is also desirable to have good easy welding
Property and anti-lamellar tearing performance are to meet the welding requirements during platform construction.Generally, it is desirable to the yield strength of semi-circular plate >=
690MPa, tensile strength 770～940MPa, elongation percentage >=14%, the Charpy-V impact power >=69J of-40 DEG C at steel plate 1/4 thickness.With
The development of deep-sea oil gas exploration, for meeting the safety need of super adverse circumstances Offshore Platform Under, except above-mentioned requirements is anticipated
Outward, semi-circular plate ballistic work toughness, weldability and anti-lamellar tearing performance at low temperatures is had higher requirement, it is desirable to-
Charpy-V impact power >=69J at 60 DEG C, C in the case of≤0.12%, Pcm≤0.30, the Z-direction contraction percentage of area >=35%.At present, low
The high-strength and high-ductility steel plate of the 70-100mm thickness that can use at-60 DEG C that the low-crackle sensitive of carbon design easily welds is in state
Inside yet there are no report.
The patent of invention that patent announcement number is CN103014541A proposes a kind of 690MPa level think gauge ocean engineering and uses
Steel and manufacture method thereof, can manufacture Charpy-V impact power at the steel plate of maximum gauge 120mm ,-60 DEG C and meet >=the requirement of 69J.But
It is, this technology C content 0.08-0.15% that 120mm thickness C content reaches 0.13%, and carbon equivalent is about 0.73 so that this steel plate is not
Meet the requirement of easily welding.
It is quick that the patent of invention that patent announcement number is CN101418418A proposes a kind of low crackle of yield strength 690MPa level
Perception steel plate and manufacture method thereof.But, its maximum gauge is 60mm, does not discloses-60 DEG C of impact properties simultaneously.
The patent of invention that patent announcement number is CN105039865A proposes a kind of high-strength high-toughness steel plate and manufacture thereof
Method, C content is in 0.12-0.17% ,-40 DEG C of Charpy-V impact power >=100J, the clearest and the most definite Ceq and Pcm value, and C content is higher, discontented
Foot easily welding requirements, the most clearly-60 DEG C of low-temperature impact work situations.
Summary of the invention
The technical problem to be solved is to provide one can use under the conditions of-60 DEG C for above-mentioned prior art
70-100mm thickness, carbon equivalent≤0.60, the easily welding anti-stratiform of high-strength and high-ductility of cold crack sensitivity coefficient (Pcm)≤0.28
The 690MPa steel plate of tear resistance excellence and manufacture method thereof.
In order to improve the intensity of steel plate, the carbon content in steel plate to be typically maintained on bigger content, but be as carbon and contain
The raising of amount, the welding performance of steel can become poor；Especially, in the case of needs increase steel plate thickness, ensureing steel
On the premise of plate intensity does not declines, more need to improve the carbon content in composition, the most just further result in welded steel performance, resist
The deterioration of lamellar tearing performance, makes steel plate be restricted in structural steel application.
The present invention solves the technical scheme that the problems referred to above are used: a kind of easily welding low temperature anti-lamellar tearing excellent performance
Steel plate, the chemical composition weight/mass percentage composition of steel plate is C 0.05-0.09%；Si 0.2-0.4%；Mn 0.9-1.3%；Al
0.02-0.04%；Nb 0.01-0.03%；V 0.03-0.05%；Cr 0.3-0.5%；Ni 1.0-1.4%；Mo 0.3-0.6%；Cu
0.2-0.6%；Ti 0.01-0.02%；B 0.001-0.002%；P≤0.015%；S≤0.003%；N≤0.007%；Surplus is Fe
And inevitably impurity, carbon equivalent≤0.60；Weld crack sensitivity coefficient is Pcm≤0.28, Pcm=C+Si/30+ (Mn+Cu+
Cr)/20+Ni/60+Mo/15+V/10+5B。
Compared with patent of invention publication number 103014541A, this invention takes lower carbon content design, and from element
Composition forces down carbon equivalent and crack-sensitivity coefficient generally, ensures that steel plate has excellence on the premise of not reducing armor plate strength
Weldability.The smelting flow process of steel plate is: KR molten iron pretreatment-converter-LF refine-RH vacuum outgas-sheet billet continuous casting-slow cooling-roll
System-Tempering and Quenching-essence inspection-performance detection-packaging warehouse-in.
The thickness of finished steel plate is 70～100mm, more than yield strength 690MPa, and tensile strength 770～940MPa, extend
Rate >=16%, at 1/4 thickness of-60 DEG C of lower steel plates and 1/2 thickness Charpy-V impact power all >=100J, the Z-direction contraction percentage of area >=35%,
Can meet and be on active service under-60 DEG C of ultra-low temperature surroundings.
In the present invention, effect and the content thereof of contained all components select reason to be described as follows:
C: affect the essential element of intensity, quenching degree and weldability, improves the intensity of steel with solution strengthening form；Carbon content is too high
Can have a negative impact toughness and the weldability of steel, carbon content is too low, steel plate quenching degree can be caused not enough, low strength.Combine
Closing and consider, the C content range of choice of the present invention is 0.05-0.09%.
Si: deoxidant element, improves the intensity of steel with solution strengthening form, too low, affects deoxidation effect, and too high meeting is to table
Face quality, toughness and welding performance have a negative impact, and consider, and the Si content range of choice of the present invention is 0.2-0.4%.
Mn: affect the main alloy element of intensity, quenching degree and weldability, improves the intensity of steel with solution strengthening form,
The deficiency making up C reduction and cause；Mn content then cannot play the effect of solution strengthening when less than 0.8%, too high can improve steel
Carbon equivalent and crack-sensitivity coefficient, the weldability of steel is had a negative impact；Meanwhile, Mn easily produces partially in steel plate heart portion
Analysis, has a negative impact to the low-temperature impact toughness in steel plate heart portion.The range of choice of Mn content of the present invention is 0.9-1.30%；
Al: play the effect of deoxidation and fixed nitrogen, and play the effect of crystal grain thinning by forming AlN.The selection of Al content of the present invention
Scope is 0.02-0.04%.
Nb: pinning effect and the notable fining austenite grains of precipitation strength effect can be passed through in the operation of rolling, favorably
In intensity and the raising of toughness.Too high Nb can make production cost significantly improve, simultaneously unfavorable to weldability.Nb of the present invention contains
The range of choice of amount is 0.01-0.03%.
V: carbonitride-forming elements, by forming V(C, N), intensity and the toughness of steel is improved with the form of dispersion-strengtherning,
Fining ferrite grains degree, weldability then can be had a negative impact by too high levels.The range of choice of V content of the present invention is
0.03-0.05%。
Cr: medium carbide former, it is possible to increase the quenching degree of steel and intensity, makes up that C content is relatively low causes intensity
The deficiency declined with quenching degree.Add excess, then the low-temperature impact toughness of steel and weldability can be had a negative impact.The present invention
The range of choice of Cr content is 0.3-0.5%.
Ni: the intensity of steel can be improved simultaneously and improve low-temperature impact toughness, improving material when Cu constituent content is too high
Hot cracking tendency.During Ni too high levels, continuous casting billet heating process can produce the iron scale that viscosity is higher, affect steel plate table
Face quality.Meanwhile, the highest Ni improves carbon equivalent and the crack-sensitivity coefficient of steel plate, affects the weldability of steel plate.Ni of the present invention
The range of choice of content is 1.0-1.4%.
Mo: can significantly improve quenching degree and the intensity of steel, when appropriate Mo can overcome modifier treatment, steel belt roof bolt is crisp
Property thus improve the impact flexibility of steel.Crossing and can have a negative impact the weldability of steel at most, also resulting in cost increases.This
The range of choice of bright Mo content is 0.2-0.6%.
Cu: can improve the quenching degree of steel, intensity and decay resistance, reduces the hydrogen induced cracking sensitivity of steel plate；Too high
The weldability of steel plate can be had a negative impact, avoid producing copper brittleness phenomenon simultaneously need to add more Ni.Cu of the present invention
The range of choice of content is 0.2-0.6%.
Ti: play the effect of precipitation strength by forming TiN, effective crystal grain thinning, toughness then can be produced by too high levels
Adverse effect.The range of choice of Ti content of the present invention is 0.01-0.02%.
B: improve the most significant element of quenching degree, it is the most unfavorable that weldability and low-temperature flexibility then can be produced by too high levels
Impact.The range of choice of B content of the present invention is 0.001-0.002%.
P, S: as the major impurity element in steel, the low-temperature impact toughness in steel plate especially steel plate heart portion can be produced not
Profit impact, content controls the lowest more good.According to existing actual production conditions, the range of choice of P, S content of the present invention be P≤
0.015%, S≤0.003%.
The preparation method of above-mentioned easy welding 690MPa level steel plate comprises following processing step:
(1) in steel making working procedure, KR molten iron pretreatment, converter smelting, LF refine, RH Fruit storage is used to produce high-purity
Clean molten steel, then produces 370-450mm thickness continuous casting plate billet by special thick continuous casting steel billet production technology, adds continuous casting billet
Cover stacking slow cooling expands hydrogen and processes, stacking slow cooling time >=120 hour；
(2) continuous casting billet is heated to 1150-1250 DEG C, is incubated 150-180min, make the abundant solid solution of the alloying element in steel to protect
The uniformity of card performance, continuous casting billet uses high-pressure water descaling after coming out of the stove；
(3) continuous casting billet being carried out two-phase control rolling, the first stage is rough rolling step, start rolling temperature at 1100-1180 DEG C, single pass
Average reduction ratio >=15%；Second stage is the finish rolling stage, and start rolling temperature is 840-900 DEG C, accumulative percentage pass reduction >=40%；Roll
After carry out thermal straightening；
(4) after thermal straightening, steel plate heap slow cooling of rolling off the production line is expanded hydrogen and is processed, and reduces in steel plate the content of H to ensure the portion's low-temperature impact of the steel plate heart
Toughness, heap slow cooling time >=72 hour；
(5) steel plate after slow cooling being carried out quenching+tempering process, quenching and being tempered all is carried out in continuous oven, and hardening heat is
910-930 DEG C, quench time inside furnace 1.8-2.2min/mm；Temperature is 630-680 DEG C, is tempered time inside furnace 3.0-
4.0min/mm, after coming out of the stove, air cooling i.e. obtains steel plate finished product.
The present invention is directed to the requirement easily welding high-strength and high-ductility steel plate used under the conditions of-60 DEG C, composition uses low
The composition design of carbon, low-carbon-equivalent and low crack-sensitivity coefficient, in technique, uses the smelting of high purity steel, with 370-450mm thickness
The special thick continuous casting steel billet of degree is produced thickness easily weld at 70-100mm as raw material, the method taking controlled rolling to add Tempering and Quenching
Connect high-strength and high-ductility steel plate.
Compared with prior art, it is an advantage of the current invention that:
Low-carbon (LC), low-carbon-equivalent and low-crackle sensitive, C0.05-is achieved on 690MPa its composition of level steel plate involved in the present invention
0.09%, carbon equivalent≤0.60, crack-sensitivity FACTOR P cm≤0.28, on the premise of not sacrificing armor plate strength, make the weldering of steel plate
Connecing property has obtained notable optimization, it is easy to welding operation.The steel plate produced according to the application technique, has good welds basis
On, there is excellent high-strength and high-ductility, yield strength >=690MPa, tensile strength between 770-940MPa, elongation percentage >=
16%, at 1/4 thickness of-60 DEG C of lower steel plates and 1/2 thickness Charpy-V impact power all >=100J, the Z-direction contraction percentage of area >=35%, it is possible to
Meet and use under the cryogenic conditions of-60 DEG C.
Accompanying drawing explanation
Fig. 1 is the micro-organization chart of embodiment of the present invention 70mm thickness steel plate；
Fig. 2 is the micro-organization chart of embodiment of the present invention 100mm thickness steel plate.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment 1-2:
Steel sheet manufacturing method involved by two embodiments: KR molten iron pretreatment converter smelting LF refine RH vacuum outgas is even
Casting continuous casting billet covering slow cooling continuous casting billet inspection cleaning strand heating high-pressure water descaling rolling straightening steel plate heap
The processing steps such as slow cooling Q-tempering, manufacture thickness respectively 70(embodiment 1) and 100mm(embodiment 2) high-strength and high ductility
The easy welding steel of property.
Above-mentioned heating, rolling and slow cooling stage specifically comprises the processes of: 370mm thickness continuous casting billet is heated to 1200 DEG C, protect
Temperature 180min(embodiment 1) or it is heated to 1250 DEG C, it is incubated 150min(embodiment 2), continuous casting billet uses water under high pressure to remove after coming out of the stove
Squama；Then two-phase control rolling, first stage start rolling temperature 1100 DEG C (embodiment 1) or 1150 DEG C (embodiment 2), intermediate blank are carried out
Thickness 200mm, the average reduction ratio of single pass 15.5%；Second stage start rolling temperature is 860 DEG C, and accumulative percentage pass reduction 65%(is real
Execute example 1) or second stage start rolling temperature 850 DEG C, accumulative percentage pass reduction 50%(embodiment 2), final finished steel plate thickness is
70mm(embodiment 1) and 100mm(embodiment 2).Roll rear thermal straightening；After thermal straightening, steel plate carries out the heap slow cooling expansion hydrogen that rolls off the production line, and heap delays
Cool time 72 hours (embodiments 1) and 84 hours (embodiment 2).
Steel plate entrance continuous oven after slow cooling completes carries out Quenching Treatment, embodiment 1: heating-up temperature 910 DEG C, time inside furnace
2.2min/mm, uses quenching press shrend.Embodiment 2: heating-up temperature 930 DEG C, time inside furnace 1.8min/mm, use quenching press water
Quench.The steel plate completing Quenching Treatment is proceeded temper in continuous oven, embodiment 1: heating-up temperature 660 DEG C, at stove
Time 4.0min/mm, embodiment 2: heating-up temperature 680 DEG C, time inside furnace 3.0min/mm.
The corresponding steel plate chemical composition of embodiment 1 and 2 is shown in Table 1, and the mechanical property of steel plate is shown in Table 2, and the microscopic structure of steel plate is such as
Shown in Fig. 1 and Fig. 2.
Table 1 embodiment 1 and 2 is easily welded the chemical composition (wt.%) of high-strength and high-ductility anti-lamellar tearing steel plate
| Example | C | Si | Mn | P | S | Al | Nb | V | Ti | Cr | Ni | Mo | Cu | B | N | Ceq | Pcm |
| 1 | 0.07 | 0.28 | 1.10 | 0.008 | 0.002 | 0.031 | 0.019 | 0.045 | 0.013 | 0.44 | 1.11 | 0.46 | 0.24 | 0.0014 | 0.0046 | 0.53 | 0.23 |
| 2 | 0.08 | 0.23 | 1.21 | 0.009 | 0.001 | 0.032 | 0.021 | 0.048 | 0.016 | 0.44 | 1.19 | 0.48 | 0.35 | 0.0014 | 0.0036 | 0.58 | 0.25 |
Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B
Table 2 embodiment 1 and 2 is easily welded the mechanical property of high-strength and high-ductility anti-lamellar tearing steel plate
The present invention is designed by Ultra-low carbon, low-carbon-equivalent and the low-crackle sensitive composition of original creation, is successfully made by hardening and tempering process
Make 70-100mm thickness and easily weld high-strength and high-ductility anti-lamellar tearing steel plate.In 70-100mm big thickness steel plate field, use
Ultra-low carbon composition designs to ensure Plate Welding, uses hardening and tempering process design to achieve the mechanical property such as-60 DEG C of ultralow-temperature flexibilities
Energy.
Claims (3)
1. the steel plate of an easy welding low temperature anti-lamellar tearing excellent performance, it is characterised in that: the chemical composition quality of this steel plate
Percentage composition is C 0.05-0.09%；Si 0.2-0.4%；Mn 0.9-1.3%；Al 0.02-0.04%；Nb 0.01-0.03%；V
0.03-0.05%；Cr 0.3-0.5%；Ni 1.0-1.4%；Mo 0.3-0.6%；Cu 0.2-0.6%；Ti 0.01-0.02%；B
0.001-0.002%；P≤0.015%；S≤0.003%；N≤0.007%；Surplus is Fe and inevitable impurity, carbon equivalent≤
0.60；Weld crack sensitivity coefficient is Pcm≤0.28, Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+
5B。
The steel plate of easy welding low temperature the most according to claim 1 anti-lamellar tearing excellent performance, it is characterised in that: this steel plate
Thickness be 70～100mm, more than yield strength 690MPa, tensile strength 770～940MPa, elongation percentage >=16%, at-60 DEG C
At 1/4 thickness of steel plate and 1/2 thickness Charpy-V impact power all >=100J, the Z-direction contraction percentage of area >=35%, can take at-60 DEG C
Labour.
3. the method easily welding low temperature anti-lamellar tearing excellent performance steel plate described in a manufacturing claims 1, it is characterised in that:
Comprise following processing step:
(1) use KR molten iron pretreatment, converter smelting, LF refine, RH Fruit storage to produce high-purity molten steel, then lead to
Cross special thick continuous casting steel billet production technology and produce 370-450mm thickness continuous casting plate billet, continuous casting billet is carried out covering stacking slow cooling expansion
Hydrogen processes, stacking slow cooling time >=120 hour；
(2) continuous casting billet is heated to 1150-1250 DEG C, is incubated 150-180min, makes the abundant solid solution of the alloying element in steel, continuous casting
Base uses high-pressure water descaling after coming out of the stove；
(3) continuous casting billet being carried out two-phase control rolling, the first stage is rough rolling step, start rolling temperature at 1100-1180 DEG C, single pass
Average reduction ratio >=15%；Second stage is the finish rolling stage, and start rolling temperature is 840-900 DEG C, accumulative percentage pass reduction >=40%；Roll
After carry out thermal straightening；
(4) after thermal straightening steel plate roll off the production line heap slow cooling expand hydrogen process, heap slow cooling time >=72 hour；
(5) steel plate after slow cooling being carried out quenching+tempering process, quenching and being tempered all is carried out in continuous oven, and hardening heat is
910-930 DEG C, quench time inside furnace 1.8-2.2min/mm；Temperature is 630-680 DEG C, is tempered time inside furnace 3.0-
4.0min/mm, after coming out of the stove, air cooling i.e. obtains steel plate finished product.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610272420.4A CN105755369B (en) | 2016-04-28 | 2016-04-28 | A kind of steel plate of the easy welding anti-lamellar tearing excellent performance of low temperature and preparation method thereof |
| PCT/CN2016/102382 WO2017185668A1 (en) | 2016-04-28 | 2016-10-18 | Easy-to-weld steel plate with excellent lamellar tearing resistance at low temperature and preparation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610272420.4A CN105755369B (en) | 2016-04-28 | 2016-04-28 | A kind of steel plate of the easy welding anti-lamellar tearing excellent performance of low temperature and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106567011A (en) * | 2016-11-09 | 2017-04-19 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld ultra-thick steel plate with high strength and high toughness suitable for minus 60 DEG C and manufacturing method thereof |
| WO2017185668A1 (en) * | 2016-04-28 | 2017-11-02 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld steel plate with excellent lamellar tearing resistance at low temperature and preparation method therefor |
| CN107904488A (en) * | 2017-11-06 | 2018-04-13 | 江阴兴澄特种钢铁有限公司 | The anti-lamellar tearing Q550 steel plates of the special thickness high-strength and high ductility of one kind and its manufacture method |
| CN107937802A (en) * | 2017-10-26 | 2018-04-20 | 江阴兴澄特种钢铁有限公司 | 60 80mm thickness low-crackle sensitives, easy weld-end fittings steel plate and its manufacture method used under a kind of cryogenic conditions |
| CN108034885A (en) * | 2017-11-09 | 2018-05-15 | 江阴兴澄特种钢铁有限公司 | The low-crackle sensitive steel for pipe fittings plate and its manufacture method used under a kind of cryogenic conditions |
| CN108048733A (en) * | 2017-11-09 | 2018-05-18 | 江阴兴澄特种钢铁有限公司 | A kind of economical low-temperature high-toughness self tempering steel for pipe fittings plate and its manufacturing method |
| CN109897928A (en) * | 2019-03-25 | 2019-06-18 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of the big thickness steel plate of the continuous casting billet production guarantee anti-lamellar tearing performance of core |
| CN110724878A (en) * | 2019-10-30 | 2020-01-24 | 鞍钢股份有限公司 | 0.5Ni low-temperature steel and manufacturing method thereof |
| CN111607748A (en) * | 2020-05-15 | 2020-09-01 | 江阴兴澄特种钢铁有限公司 | High-flatness large-thickness lamellar tearing resistant 780CF-Z35 hydroelectric steel and manufacturing method thereof |
| CN111926234A (en) * | 2020-08-12 | 2020-11-13 | 宝武集团鄂城钢铁有限公司 | Production method for producing super-thick high-strength steel plate for building with excellent thickness directivity based on continuous casting billet single frame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017185668A1 (en) * | 2016-04-28 | 2017-11-02 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld steel plate with excellent lamellar tearing resistance at low temperature and preparation method therefor |
| CN106567011A (en) * | 2016-11-09 | 2017-04-19 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld ultra-thick steel plate with high strength and high toughness suitable for minus 60 DEG C and manufacturing method thereof |
| CN107937802A (en) * | 2017-10-26 | 2018-04-20 | 江阴兴澄特种钢铁有限公司 | 60 80mm thickness low-crackle sensitives, easy weld-end fittings steel plate and its manufacture method used under a kind of cryogenic conditions |
| CN107904488A (en) * | 2017-11-06 | 2018-04-13 | 江阴兴澄特种钢铁有限公司 | The anti-lamellar tearing Q550 steel plates of the special thickness high-strength and high ductility of one kind and its manufacture method |
| CN108034885A (en) * | 2017-11-09 | 2018-05-15 | 江阴兴澄特种钢铁有限公司 | The low-crackle sensitive steel for pipe fittings plate and its manufacture method used under a kind of cryogenic conditions |
| CN108048733A (en) * | 2017-11-09 | 2018-05-18 | 江阴兴澄特种钢铁有限公司 | A kind of economical low-temperature high-toughness self tempering steel for pipe fittings plate and its manufacturing method |
| CN108034885B (en) * | 2017-11-09 | 2020-05-15 | 江阴兴澄特种钢铁有限公司 | Steel plate for low-crack-sensitivity pipe fitting used under low-temperature condition and manufacturing method thereof |
| CN109897928A (en) * | 2019-03-25 | 2019-06-18 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of the big thickness steel plate of the continuous casting billet production guarantee anti-lamellar tearing performance of core |
| CN110724878A (en) * | 2019-10-30 | 2020-01-24 | 鞍钢股份有限公司 | 0.5Ni low-temperature steel and manufacturing method thereof |
| CN111607748A (en) * | 2020-05-15 | 2020-09-01 | 江阴兴澄特种钢铁有限公司 | High-flatness large-thickness lamellar tearing resistant 780CF-Z35 hydroelectric steel and manufacturing method thereof |
| CN111926234A (en) * | 2020-08-12 | 2020-11-13 | 宝武集团鄂城钢铁有限公司 | Production method for producing super-thick high-strength steel plate for building with excellent thickness directivity based on continuous casting billet single frame |
| CN111926234B (en) * | 2020-08-12 | 2021-06-22 | 宝武集团鄂城钢铁有限公司 | Production method for producing super-thick high-strength steel plate for building with excellent thickness directivity based on continuous casting billet single frame |
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| CN105755369B (en) | 2017-07-18 |
| WO2017185668A1 (en) | 2017-11-02 |
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