CN110358971A - A kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof - Google Patents
A kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof Download PDFInfo
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- 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
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Abstract
The present invention discloses a kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof, chemical component is by weight percentage are as follows: 0.05~0.09%C, 0.15~0.35%Si, 0.6~1.2%Mn, 0.04~0.10%Nb, 1.5~2.5%Cu, 0.4~0.8%Mo, 0.4~0.8%Cr, 0.5~0.8%Al, 2.5~4%Ni, surplus is Fe and inevitable impurity, and preparation method includes smelting, hot rolling and tempering heat treatment steps.Technical solution of the present invention is without out-line quenching and is suitble to industrialized mass production, without adding valuable boron element and wolfram element, and without adding microalloy element vanadium.
Description
Technical field
The invention belongs to field of iron and steel, are related to a kind of super-high strength steel with excellent obdurability and weldability, specifically
It is related to a kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof.
Background technique
The super-high strength steel that yield strength is 1300MPa grade with high intensity, can be used for manufacturing goliath boom,
Naval vessels or the armoring explosion-proof component of arms, undercarriage supplementary structure etc..Currently, yield strength 1300MPa and the above rank are super
High-strength steel depends on carbon and alloying to obtain high intensity, so needing in selection of chemical composition and setting
The alloying elements such as the carbon containing certain content, a variety of microalloy elements and boron, chromium, molybdenum, nickel.Publication No.
The patent of CN106086657A and CN104532156A discloses the super-high strength steel that yield strength is greater than 1300MPa, and carbon contains
Amount respectively reaches 0.18~0.23% and 0.21~0.26%, is to obtain superelevation because carbon has extremely strong solution strengthening effect
The key element of intensity.The super-high strength steel of yield strength up to 1300MPa are mainly used in welding structural element, past in application process
Toward needing just come into operation after a large amount of welding sequence, so weldability is that such steel could big face popularization and application
Key characteristic.With the increase of carbon content, the welding crack sensibility of super-high strength steel increases, and welding cold cracking tendency is big, therefore
Strict control preheating temperature and welding condition are needed in welding process, this will lead to, and construction period extends, manufacturing cost increases
Add.
In the preparation process of super-high strength steel, the prior art is usually that will first be cooled to low temperature after slab or forging stock hot rolling,
Then it is reheated to complete austenitizing temperature (Ac3) more than temperature quenched, to obtain martensitic structure, thus
Make steel that there is the intensity of superelevation, finally reheats carry out tempering heat treatment again.For example, the preparation of above-mentioned two patent disclosure
Method requires for steel plate to be reheated to 810~950 DEG C and Ac respectively3+ (30~80) DEG C quench again, finally carry out at tempering again
Reason.Meanwhile in order to improve harden ability, make martensitic structure easy to form in quenching process, the height that also added certain content is quenched
Permeability element boron.The super-high strength steel of the yield strength 1300MPa of above-mentioned two patent disclosure contains respectively in chemical component
The boron element of 0.0008-0.0025% and 0.0005~0.0030%.On the one hand, in the preparation process of super-high strength steel using from
The process of line quenching+tempering, process procedure is relatively more, causes energy consumption to increase, the production cycle extends；On the other hand, add
The narrow fluctuation range for adding the super-high strength steel boron content of boron element to allow, this just proposes high requirement to smelting, in smelting process when
Do not have the effect for improving harden ability when boron content is relatively low, but when boron content is higher is very easy to cause boron in cyrystal boundary segregation again,
Reduce the plasticity and toughness of steel.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, exist in view of 1300MPa grades of super-high strength steels of yield strength
These problems, the low-carbon super-high strength steel of a kind of yield strength greater than 1300MPa and preparation method thereof is provided, and it is an object of the present invention to provide
A kind of yield strength 1300MPa grades of low-carbon, without boron super-high strength steel, the super-high strength steel being related to has both the intensity, excellent of superelevation
Plasticity, high low-temperature flexibility and excellent weldability feature；One kind is provided simultaneously without out-line quenching and is suitble to industrial mass
The preparation method of the low-carbon super-high strength steel of production.
Technical purpose of the invention is achieved by following technical proposals:
A kind of yield strength 1300MPa grades low-carbon super-high strength steel and preparation method thereof, chemical analysis is by weight percentage
Are as follows: 0.05~0.09%C, 0.15~0.35%Si, 0.6~1.2%Mn, 0.04~0.10%Nb, 1.5~2.5%Cu, 0.4
~0.8%Mo, 0.4~0.8%Cr, 0.5~0.8%Al, 2.5~4%Ni, surplus are Fe and inevitable impurity and use
It is prepared by following steps:
Step 1, it smelts
According to chemical component: 0.05~0.09%C, 0.15~0.35%Si, 0.6~1.2%Mn, 0.04~0.10%
Nb, 1.5~2.5%Cu, 0.4~0.8%Mo, 0.4~0.8%Cr, 0.5~0.8%Al, 0.00~0.025%, 2.5~4%
Ni, surplus are that Fe and inevitable impurity are smelted, and obtain slab
Step 2, hot rolling
The slab that step 1 is obtained is placed in 1150~1220 DEG C and keeps the temperature, and then carries out hot rolling；Hot rolling uses two stages
Rolling mill practice, 1150~1000 DEG C of first stage rolling temperature, reduction ratio >=45%, second stage rolling temperature 920~750
DEG C, reduction ratio >=60% is finally rolled to 10~30mm；High-temperature steel plate direct-on-line after hot rolling is water-cooled to 100-450
DEG C, cooling rate controls in the range of 20~65 DEG C/s
Step 3, tempering heat treatment
Steel plate after step 2 hot rolling is placed in 450~600 DEG C of heat preservations and carries out tempering heat treatment, is then air-cooled to room temperature
20-25 degrees Celsius.
In the above-mentioned technical solutions, the chemical component constitutive characteristic of above-mentioned super-high strength steel is first without valuable boron is added
Element and wolfram element, and without adding microalloy element vanadium；Chemical analysis is by weight percentage are as follows: 0.06~0.08%C, 0.2
~0.3%Si, 0.8~1%Mn, 0.06~0.08%Nb, 1.8~2.5%Cu, 0.4~0.8%Mo, 0.4~0.6%Cr,
0.5~0.8%Al, 2.5~3.5%Ni, surplus are Fe and inevitable impurity.
In the above-mentioned technical solutions, low-carbon super-high strength steel microstructure is based on bainite, and deposits in bainite matrix
In the precipitation strength phase of a large amount of nano-scales, size 10nm is hereinafter, such as 5-10nm.
In the above-mentioned technical solutions, above-mentioned super-high strength steel yield strength Rp0.2 >=1300MPa, up to 1317-
1370MPa；Tensile strength Rm >=1350MPa, up to 1371-1410MPa；Elongation after fracture >=15%, reachable 18-20%,
It is matched with excellent strong plasticity, and-40 DEG C of ballistic work >=45J, up to 47-65J；- 60 DEG C of ballistic work >=27J, it is reachable
28-47J are tested with excellent low-temperature flexibility.
In the above-mentioned technical solutions, when carrying out tempering heat treatment, the tempering heat treatment time is 1-5 hours；Tempering heat treatment
Temperature is 500-560 degrees Celsius, and the time is 1-2 hours.The effect of tempering heat treatment process is to make to be precipitated in steel a large amount of
Nano-strengthening phase, greatly improve intensity.
In the above-mentioned technical solutions, slab step 1 obtained is placed in 1150~1220 DEG C and keeps the temperature, and soaking time is
1-3 hours, it is preferable that holding temperature is 1180-1200 degrees Celsius, and soaking time is 1-2 hours.
In the above-mentioned technical solutions, first stage rolling temperature is 1050-1100 degrees Celsius, second stage rolling temperature
It is 800-900 degrees Celsius.
In the above-mentioned technical solutions, it is water-cooled to 200-400 DEG C online, cooling rate is controlled in 20~50 DEG C/s.
The selection and content setting that super-high strength steel chemical component of the invention is constituted are based on the following:
1) carbon: the important intensified element of super-high strength steel can significantly improve the harden ability of steel.But high carbon content
Deteriorate the weldability of steel, is unfavorable for subsequent use, and high-carbon content can also make steel be easy to produce a large amount of embrittlement
Martensitic structure damages plasticity and toughness.In the present invention, in order to improve super-high strength steel weldability, plasticity and toughness, and guarantee tool
There is the intensity of superelevation, carbon content is set in the range of 0.05~0.09%.
2) silicon: the intensified element of steel, but surface quality of steel can be also reduced simultaneously.Therefore, silicon is limited in the present invention
In the range of 0.15~0.35%.
3) manganese: stable austenite element can be improved the harden ability of steel, and play the work of solution strengthening and crystal grain refinement
With.Manganese content is 0.6~1.2% in well-behaved invention.
4) niobium: having the function of refining crystal grain, and as carbide, niobium carbide precipitation can be formed in conjunction with carbon
Hardening constituent effectively improves intensity.Content of niobium is 0.04~0.10% in the present invention.
5) copper: austenite stabilizer element can form nanometer by tempering heat treatment process when content reaches certain value
Hardening constituent makes steel under low carbon content still with the intensity of superelevation.It is greater than in the present invention in order to meet yield strength
The requirement of 1300MPa, copper content are set as 1.5~2.5%.
6) chromium and molybdenum: the intensity and hardness of steel can be improved in harden ability element, prevents temper brittleness, but too high levels
It may also lead to that phase transition temperature is too low, form a large amount of hard and crisp martensitic structures, reduce toughness and plasticity.Chromium and molybdenum in the present invention
Content be 0.4~0.8%.
7) aluminium: can be used as deoxidier in smelting process, and the effect of refinement crystal grain, fixed nitrogen is also acted as in steel,
It is remarkably improved toughness.In the present invention, aluminium and copper are used cooperatively, and can play significant invigoration effect, aluminium and molybdenum, copper, silicon, chromium
With the use of that can also improve corrosion resistance, content is set as 0.5~0.8%.
8) nickel: on the one hand strong harden ability element improves steel strength, on the other hand improves low-temperature flexibility, for cupric
The addition of the super-high strength steel of element, nickel can avoid temper brittleness.Content requirement Ni/Cu >=1 of nickel in the present invention, with 2.5~4%
It is preferred.
Compared with prior art, the invention has the benefit that
1, super-high strength steel yield strength of the invention is greater than 1300MPa, and elongation after fracture is greater than 15%, -40 DEG C of ballistic works
Greater than 45J, -60 DEG C of ballistic works are greater than 27J, have both the intensity and excellent plasticity of superelevation, and low-temperature impact toughness is excellent,
Toughness meets F grades of (- 60 DEG C) requirements.
2, super-high strength steel of the invention is on organization design, using bainite as matrix, and is obtained by nano-strengthening phase
The intensity of superelevation, while being designed using low carbon content, carbon content is only 0.05~0.09%, therefore is keeping this kind of steel
With excellent weldability while superhigh intensity, particularly suitable for welding structural element.
3, super-high strength steel of the present invention, can without carrying out out-line quenching process procedure after hot rolling in preparation process
To shorten preparation process flow, energy saving, it is especially suitable for carrying out industrialized mass production.
Detailed description of the invention
Fig. 1 is the super-high strength steel electron scanning microstructure picture of the embodiment of the present invention 1.
Fig. 2 is the super-high strength steel electron scanning microstructure picture of the embodiment of the present invention 7.
Fig. 3 is the super-high strength steel transmission electron microscopy macrograph of the embodiment of the present invention 1.
Fig. 4 is the super-high strength steel transmission electron microscopy macrograph of the embodiment of the present invention 7.
Fig. 5 is the super-high strength steel high power transmission electron microscopy macrograph of the embodiment of the present invention 1.
Specific embodiment
Embodiment of the present invention is described in detail combined with specific embodiments below, to steel in the embodiment of the present invention
Performance test is executed according to ASTM-A370-17 standard.
Embodiment 1
A kind of yield strength 1300MPa grades of low-carbon super-high strength steels of the invention, by set component smelting molten steel and cast
Base, ingredient is by weight percentage are as follows: 0.05%C, 0.30%Si, 1.15%Mn, 0.08%Nb, 1.9%Cu, 0.40%Mo,
0.8%Cr, 0.6%Al, 3.5%Ni, surplus are Fe and inevitable impurity.
Slab is heated to 1150 DEG C, keeps the temperature 2h, then carries out two stages hot rolling；First stage rolling temperature 1150~
1000 DEG C, reduction ratio 51%, 920~750 DEG C of second stage rolling temperature, reduction ratio 80%, finally by hot-rolled steel plate to 10mm；
High-temperature steel plate after hot rolling is directly water-cooled to 102 DEG C, and cooling rate is 65 DEG C/s；Steel plate is heated to 600 DEG C of heat preservation 1h
Tempering heat treatment is carried out, room temperature is then air-cooled to.
Yield strength Rp0.2 1370MPa, tensile strength Rm 1405MPa, extension of having no progeny are obtained using above-mentioned preparation method
The low-carbon super-high strength steel of 20%, -40 DEG C of ballistic work 65J of rate, -60 DEG C of ballistic work 32J.
Embodiment 2
A kind of yield strength 1300MPa grades of low-carbon super-high strength steels of the invention, by set component smelting molten steel and cast
Base, ingredient is by weight percentage are as follows: 0.08%C, 0.24%Si, 1.0%Mn, 0.065%Nb, 2.1%Cu, 0.52%Mo,
0.61%Cr, 0.7%Al, 2.9%Ni, surplus are Fe and inevitable impurity.
Slab is heated to 1150 DEG C, keeps the temperature 2h, then carries out two stages hot rolling；First stage rolling temperature 1150~
1000 DEG C, reduction ratio 57%, 920~750 DEG C of second stage rolling temperature, reduction ratio 71%, finally by hot-rolled steel plate to 11mm；
High-temperature steel plate after hot rolling is directly water-cooled to 250 DEG C, and cooling rate is 36 DEG C/s；Steel plate is heated to 580 DEG C of heat preservations
1.2h carries out tempering heat treatment, is then air-cooled to room temperature.
Yield strength Rp0.2 1345MPa, tensile strength Rm 1379MPa, extension of having no progeny are obtained using above-mentioned preparation method
The low-carbon super-high strength steel of 18%, -40 DEG C of ballistic work 48J of rate, -60 DEG C of ballistic work 35J.
Embodiment 3
A kind of yield strength 1300MPa grades of low-carbon super-high strength steels of the invention, by set component smelting molten steel and cast
Base, ingredient is by weight percentage are as follows: 0.065%C, 0.25%Si, 0.6%Mn, 0.04%Nb, 2.5%Cu, 0.6%Mo,
0.7%Cr, 0.8%Al, 3.2%Ni, surplus are Fe and inevitable impurity.
Slab is heated to 1220 DEG C, keeps the temperature 2h, then carries out two stages hot rolling；First stage rolling temperature 1150~
1000 DEG C, reduction ratio 45%, 920~750 DEG C of second stage rolling temperature, reduction ratio 76%, finally by hot-rolled steel plate to 13mm；
High-temperature steel plate after hot rolling is directly water-cooled to 225 DEG C, 41 DEG C/s of cooling rate；Steel plate is heated to 550 DEG C of heat preservation 1.7h
Tempering heat treatment is carried out, room temperature is then air-cooled to.
Yield strength Rp0.2 1317MPa, tensile strength Rm 1386MPa, extension of having no progeny are obtained using above-mentioned preparation method
The low-carbon super-high strength steel of 19%, -40 DEG C of ballistic work 56J of rate, -60 DEG C of ballistic work 30J.
Embodiment 4
A kind of yield strength 1300MPa grades of low-carbon super-high strength steels of the invention, by set component smelting molten steel and cast
Base, ingredient is by weight percentage are as follows: 0.063%C, 0.21%Si, 1.05%Mn, 0.07%Nb, 1.8%Cu, 0.6%Mo,
0.5%Cr, 0.74%Al, 3.5%Ni, surplus are Fe and inevitable impurity.
Slab is heated to 1150 DEG C, keeps the temperature 2h, then carries out two stages hot rolling；First stage rolling temperature 1150~
1000 DEG C, reduction ratio 44%, 920~750 DEG C of second stage rolling temperature, reduction ratio 75%, finally by hot-rolled steel plate to 14mm；
High-temperature steel plate after hot rolling is directly water-cooled to 320 DEG C, and cooling rate is 39 DEG C/s；Steel plate is heated to 550 DEG C of heat preservations
1.5h carries out tempering heat treatment, is then air-cooled to room temperature.
Yield strength Rp0.2 1360MPa, tensile strength Rm 1410MPa, extension of having no progeny are obtained using above-mentioned preparation method
The low-carbon super-high strength steel of 18%, -40 DEG C of ballistic work 47J of rate, -60 DEG C of ballistic work 28J.
Embodiment 5
A kind of yield strength 1300MPa grades of low-carbon super-high strength steels of the invention, by set component smelting molten steel and cast
Base, ingredient is by weight percentage are as follows: 0.058%C, 0.35%Si, 0.9%Mn, 0.10%Nb, 1.5%Cu, 0.65%Mo,
0.5%Cr, 0.63%Al, 3.8%Ni, surplus are Fe and inevitable impurity.
Slab is heated to 1200 DEG C, keeps the temperature 2h, then carries out two stages hot rolling；First stage rolling temperature 1150~
1000 DEG C, reduction ratio 45%, 920~750 DEG C of second stage rolling temperature, reduction ratio 73%, finally by hot-rolled steel plate to 30mm；
High-temperature steel plate after hot rolling is directly water-cooled to 360 DEG C, 35 DEG C/s of cooling rate；Steel plate is heated to 500 DEG C of heat preservation 1.5h
Tempering heat treatment is carried out, room temperature is then air-cooled to.
Yield strength Rp0.2 1328MPa, tensile strength Rm 1378MPa, extension of having no progeny are obtained using above-mentioned preparation method
The low-carbon super-high strength steel of 19%, -40 DEG C of ballistic work 58J of rate, -60 DEG C of ballistic work 47J.
Embodiment 6
A kind of yield strength 1300MPa grades of low-carbon super-high strength steels of the invention, by set component smelting molten steel and cast
Base, ingredient is by weight percentage are as follows: 0.075%C, 0.28%Si, 1.2%Mn, 0.076%Nb, 2.0%Cu, 0.55%Mo,
0.4%Cr, 0.59%Al, 2.5%Ni, surplus are Fe and inevitable impurity.
Slab is heated to 1150 DEG C, keeps the temperature 2h, then carries out two stages hot rolling；First stage rolling temperature 1150~
1000 DEG C, reduction ratio 43%, 920~750 DEG C of second stage rolling temperature, reduction ratio 71%, finally by hot-rolled steel plate to 20mm；
High-temperature steel plate after hot rolling is directly water-cooled to 210 DEG C, and cooling rate is 39 DEG C/s；Steel plate is heated to 550 DEG C of heat preservations
1.5h carries out tempering heat treatment, is then air-cooled to room temperature.
Yield strength Rp0.2 1320MPa, tensile strength Rm 1366MPa, extension of having no progeny are obtained using above-mentioned preparation method
The low-carbon super-high strength steel of 18%, -40 DEG C of ballistic work 59J of rate, -60 DEG C of ballistic work 32J.
Embodiment 7
A kind of yield strength 1300MPa low-carbon super-high strength steel of the invention, by set component smelting molten steel and casts slab,
Ingredient is by weight percentage are as follows: 0.09%C, 0.15%Si, 1.1%Mn, 0.06%Nb, 2.3%Cu, 0.8%Mo, 0.7%Cr,
0.5%Al, 4%Ni, surplus are Fe and inevitable impurity.
Slab is heated to 1220 DEG C, keeps the temperature 2h, then carries out two stages hot rolling；First stage rolling temperature 1150~
1000 DEG C, reduction ratio 58%, 920~750 DEG C of second stage rolling temperature, reduction ratio 62%, finally by hot-rolled steel plate to 30mm；
Steel plate after hot rolling is directly water-cooled to 448 DEG C hereinafter, cooling rate is 20 DEG C/s；Steel plate is heated to 520 DEG C of heat preservations
1.3h carries out tempering heat treatment, is then air-cooled to room temperature.
Yield strength Rp0.2 1342MPa, tensile strength Rm 1371MPa, extension of having no progeny are obtained using above-mentioned preparation method
The low-carbon super-high strength steel of 20%, -40 DEG C of ballistic work 55J of rate, -60 DEG C of ballistic work 29J.
Fig. 1 and Fig. 2 gives the microscopic structure of the electronic scanner microscope observation of 7 super-high strength steel of embodiment 1 and embodiment,
Fig. 3 and Fig. 4 gives the microscopic structure of the transmission electron microscope observation of 7 super-high strength steel of embodiment 1 and embodiment, it can be seen that
Super-high strength steel prepared by the present invention is using bainite as matrix.Fig. 5 provides the transmission electron microscope observation of 1 super-high strength steel of embodiment
Bainite matrix be precipitated phase morphology, it can be seen that a large amount of nanoscale precipitation strength phases are precipitated in the base, size is in 10nm
Below.
Content carries out the adjustment of technological parameter and constituent content according to the present invention, and the system of high-strength steel of the present invention can be achieved
It is standby, and show and almost the same performance of the invention.Illustrative description is done to the present invention above, it should explanation
It is that, in the case where not departing from core of the invention, any simple deformation, modification or other skilled in the art can
The equivalent replacement of creative work is not spent to each fall within protection scope of the present invention.
Claims (10)
1. a kind of yield strength 1300MPa grades of low-carbon super-high strength steel, which is characterized in that chemical analysis is by weight percentage are as follows:
0.05~0.09%C, 0.15~0.35%Si, 0.6~1.2%Mn, 0.04~0.10%Nb, 1.5~2.5%Cu, 0.4~
0.8%Mo, 0.4~0.8%Cr, 0.5~0.8%Al, 2.5~4%Ni, surplus are Fe and inevitable impurity and use such as
It is prepared by lower step:
Step 1, it smelts
According to chemical component: 0.05~0.09%C, 0.15~0.35%Si, 0.6~1.2%Mn, 0.04~0.10%Nb, 1.5
~2.5%Cu, 0.4~0.8%Mo, 0.4~0.8%Cr, 0.5~0.8%Al, 0.00~0.025%, 2.5~4%Ni are remaining
Amount is that Fe and inevitable impurity are smelted, and obtains slab
Step 2, hot rolling
The slab that step 1 is obtained is placed in 1150~1220 DEG C and keeps the temperature, and then carries out hot rolling；Hot rolling uses two-phase control rolling
Technique, 1150~1000 DEG C of first stage rolling temperature, reduction ratio >=45%, 920~750 DEG C of second stage rolling temperature, pressure
Lower rate >=60%, is finally rolled to 10~30mm；High-temperature steel plate direct-on-line after hot rolling is water-cooled to 100-450 DEG C, cooling
Rate control is in the range of 20~65 DEG C/s
Step 3, tempering heat treatment
Steel plate after step 2 hot rolling is placed in 450~600 DEG C of heat preservations and carries out tempering heat treatment, is then air-cooled to room temperature 20-25
Degree Celsius.
2. a kind of yield strength 1300MPa grades of low-carbon super-high strength steel according to claim 1, which is characterized in that be not necessarily to
Valuable boron element and wolfram element are added, and without adding microalloy element vanadium；Chemical analysis is by weight percentage are as follows: 0.06
~0.08%C, 0.2~0.3%Si, 0.8~1%Mn, 0.06~0.08%Nb, 1.8~2.5%Cu, 0.4~0.8%Mo,
0.4~0.6%Cr, 0.5~0.8%Al, 2.5~3.5%Ni, surplus are Fe and inevitable impurity.
3. a kind of yield strength 1300MPa grades of low-carbon super-high strength steel according to claim 1 or 2, which is characterized in that
Low-carbon super-high strength steel microstructure is based on bainite, and there are the precipitation strengths of a large amount of nano-scales in bainite matrix
Phase.
4. a kind of yield strength 1300MPa grades of low-carbon super-high strength steel according to claim 3, which is characterized in that be precipitated
Hardening constituent size 10nm is hereinafter, such as 5-10nm.
5. according to claim 1 or a kind of yield strength 1300MPa grades of low-carbon super-high strength steel, which is characterized in that
Yield strength Rp0.2 >=1300MPa, up to 1317-1370MPa；Tensile strength Rm >=1350MPa, up to 1371-
1410MPa；Elongation after fracture >=15% is matched up to 18-20% with excellent strong plasticity, and-40 DEG C of ballistic works >=
45J, up to 47-65J；- 60 DEG C of ballistic work >=27J, up to 28-47J.
6. a kind of preparation method of yield strength 1300MPa grades of low-carbon super-high strength steel, which is characterized in that using following steps into
Row preparation:
Step 1, it smelts
According to chemical component: 0.05~0.09%C, 0.15~0.35%Si, 0.6~1.2%Mn, 0.04~0.10%Nb, 1.5
~2.5%Cu, 0.4~0.8%Mo, 0.4~0.8%Cr, 0.5~0.8%Al, 0.00~0.025%, 2.5~4%Ni are remaining
Amount is that Fe and inevitable impurity are smelted, and obtains slab
Step 2, hot rolling
The slab that step 1 is obtained is placed in 1150~1220 DEG C and keeps the temperature, and then carries out hot rolling；Hot rolling uses two-phase control rolling
Technique, 1150~1000 DEG C of first stage rolling temperature, reduction ratio >=45%, 920~750 DEG C of second stage rolling temperature, pressure
Lower rate >=60%, is finally rolled to 10~30mm；High-temperature steel plate direct-on-line after hot rolling is water-cooled to 100-450 DEG C, cooling
Rate control is in the range of 20~65 DEG C/s
Step 3, tempering heat treatment
Steel plate after step 2 hot rolling is placed in 450~600 DEG C of heat preservations and carries out tempering heat treatment, is then air-cooled to room temperature 20-25
Degree Celsius.
7. a kind of preparation method of yield strength 1300MPa grades of low-carbon super-high strength steel according to claim 6, feature
Be, chemical analysis is by weight percentage are as follows: 0.06~0.08%C, 0.2~0.3%Si, 0.8~1%Mn, 0.06~
0.08%Nb, 1.8~2.5%Cu, 0.4~0.8%Mo, 0.4~0.6%Cr, 0.5~0.8%Al, 2.5~3.5%Ni, it is remaining
Amount is Fe and inevitable impurity.
8. a kind of preparation method of yield strength 1300MPa grades of low-carbon super-high strength steel according to claim 6, feature
It is, the slab that step 1 is obtained is placed in 1150~1220 DEG C and keeps the temperature, and soaking time is 1-3 hours, it is preferable that heat preservation
Temperature is 1180-1200 degrees Celsius, and soaking time is 1-2 hours.
9. a kind of preparation method of yield strength 1300MPa grades of low-carbon super-high strength steel according to claim 6, feature
It is, first stage rolling temperature is 1050-1100 degrees Celsius, and second stage rolling temperature is 800-900 degrees Celsius；Online
200-400 DEG C are water-cooled to, cooling rate is controlled in 20~50 DEG C/s.
10. a kind of preparation method of yield strength 1300MPa grades of low-carbon super-high strength steel according to claim 6, special
Sign is, when carrying out tempering heat treatment, the tempering heat treatment time is 1-5 hours；Tempering heat treatment temperature is 500-560 Celsius
Degree, time are 1-2 hours.
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