CN106086630B - A kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase and its manufacture method - Google Patents

A kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase and its manufacture method Download PDF

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CN106086630B
CN106086630B CN201610700839.5A CN201610700839A CN106086630B CN 106086630 B CN106086630 B CN 106086630B CN 201610700839 A CN201610700839 A CN 201610700839A CN 106086630 B CN106086630 B CN 106086630B
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steel plate
strength
room temperature
low cost
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CN106086630A (en
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刘宏玉
徐红兵
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Wuhan University of Science and Engineering WUSE
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/005Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite

Abstract

The present invention relates to a kind of tough ferrite steel plate of high strength and low cost containing nanometer precipitated phase and its manufacture method, the percentage by weight of its chemical composition:Mn is that 1.0 ~ 1.7 %, Ni are that 2.5 ~ 4.0 %, Al are that 0.5 ~ 1.5 %, Cu is that 1.5 ~ 3.0%, Y is the % of 0.01 ~ 0.10 %, C≤0.05 %, Si≤0.10 %, S≤0.04 %, P≤0.04 %, N≤0.05 %, O≤0.05, and remaining is Fe and inevitable impurity.The solution treatment under air atmosphere is carried out after smelting, casting and first edging, then in room temperature after the % of total reduction 30 70 edging again, carry out Ageing Treatment, form Dispersed precipitate on ferrite matrix and the microscopic structure of 2 ~ 10 nm richness Cu phases and 50 100 nm richness Y phases so that obtained tensile strength >=1020 MPa, elongation after fracture >=10 % the inexpensive ferrite steel plate for integrating high-strength tenacity, corrosion resistance and weldability.

Description

A kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase and its manufacture Method
Technical field
The present invention relates to high-strength tough ferrite steel plate and its manufacture method, and in particular to a kind of height containing nanometer precipitated phase Tough ferrite steel plate and its manufacture method.
Background technology
With the high speed development of modernization, the requirement more and more higher to high strength steel plate, especially petroleum pipeline, oil pipe car Special requirement is proposed with ships armour plate etc..Traditional martensite and bainite high-strength steel are met to a certain extent will Ask, but its high alloy content and complicated technology make high expensive, and higher phosphorus content is still limited weldability, corrosion resistance.
The combination property for improving steel using nanometer precipitated phase strengthened mechanism has turned into the important of exploitation novel high-strength steel Approach.Cu is added in steel, by precipitation size, quantity and the distribution of appropriate Heat Treatment Control Cu nanocluster precipitated phases, by force Change effect clearly, such as patent CN104046917A, CN104046891A individually disclose " rich Cu nanoclusters reinforcing ", The superhigh intensity ferritic steel and its manufacture method of " nanocrystalline intermetallics reinforcing ".But above-mentioned two patent of invention exists as follows Problem:
(1)It not only make use of rich nanometer Cu precipitated phases to carry out reinforced ferrite matrix, also use composite Nano carbide(V, Ti, Nb)C or(Mo, W)2C strengthens the intensity of steel, and to ensure the reinforcing effect of carbide, its carbon content is still higher(Most Greatly up to 0.2 wt.%);
(2)Add more alloying element.In addition to Cu, Ni, Al, Mn, also adding has V, Ti, Nb(V+Ti+Nb is not less than 0.01 %), Mo and W(Mo+W is not less than 0.05 %)And Si, B and Cr, cause cost to increase;
(3)Last heat treatment is " Ageing Treatment ", does not illustrate to carry out under what atmosphere.Normal air gas Atmosphere and vacuum, the Ageing Treatment of protective atmosphere, not only the manufacturing cost of material notable difference, and more importantly material occurs Essential difference occurs in the mechanical property of material especially fracture property!Such as:Design composition, preparation technology consistent with above-mentioned two patent Material(Y.R. Wen, Y.P. Li, A. Hirata, Y. Zhang, T. Fujita, T. Furuhara, C.T. Liu, A. Chiba, M.W. Chen. Synergistic alloying effect on microstructural evolution and mechanical properties of Cu precipitation-strengthened ferritic alloys mechanical properties of Cu precipitation-strengthened ferritic alloys [J]. Acta Materialia, 2013,61: 7726–7740)Tension failure pattern, be all fragility in addition to Fe-Cu-Ni Or cleavage fracture.Someone(Z.W. Zhang, C.T. Liu, Y.R. Wen, A. Hirata, S. Guo, G. Chen, M.W. Chen, and B. A. Chin. Influence of Aging and Thermomechanical Treatments on the Mechanical Properties of a Nanocluster-Strengthened Ferritic Steel[J]. Metallurgical and Materials Transactions A, 2012, 43A: 351-359)It is special to compared for oxidation Atmosphere is distinguished with the stretching fracture after vacuum aging, is found:Although the cutting process all same before timeliness, in air atmosphere and During vacuum aging, material still occur in that obvious stretching fracture difference, i.e. vacuum aging for ductile rupture, in air atmosphere For brittle fracture and the two stress-strain diagram performance it is also entirely different.
In order to solve the superhigh intensity iron element of above-mentioned " nanocluster+nano-carbide+nanocrystalline intermetallics " reinforcing The problem of body steel and its high-carbon of manufacture method, many alloys and air atmosphere Ageing Treatment brittle failure, the present invention is by redesigning Chemical composition and change manufacturing processing technic, the collection for obtaining the % of the MPa of tensile strength >=1020, elongation after fracture >=10 is high-strength Toughness, corrosion resistance and weldability are in the inexpensive ferrite steel plate of one.
The content of the invention
It is an object of the present invention to provide a kind of tough ferrite steel plate of high strength and low cost containing nanometer precipitated phase.This The tough ferrite steel plate of high strength and low cost of invention, uniform separate out is taken measurements as 2 ~ 10 nm rich Cu phases greatly on ferrite matrix With 50-100 nm rich Y phases.The reinforcing of steel based on the precipitation strength of two kinds of nanometer phases, with reference to dislocation strengthening, refined crystalline strengthening and Solution strengthening, forms composite toughening effect.
The present invention provides a kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase, by weight percentage Chemical composition is as follows:Mn be 1.0 ~ 1.7 %, Ni be 2.5 ~ 4.0 %, Al be 0.5 ~ 1.5 %, Cu be 1.5 ~ 3.0%, Y be 0.01 ~ The % of 0.10 %, C≤0.05 %, Si≤0.10 %, S≤0.04 %, P≤0.04 %, N≤0.05 %, O≤0.05, remaining is Fe With inevitable impurity.
Described nanometer precipitated phase is the rich Cu phases that size is 2 ~ 10 nm and 50-100 nm rich Y phases, per cu μ m Nanometer phase amount is 5 × 104 ~ 8×106It is individual, wherein richness Y phases account for 0.2 ~ 2 %.
Element in described rich Cu phases is based on Cu, also containing Ni, Al, Mn element;Element in described rich Y phases with Based on Y, also containing Ni, Al, Mn and As, Sb elements.
It is another object of the present invention to provide a kind of above-mentioned high strength and low cost tough iron containing nanometer precipitated phase of manufacture The method of ferritic steel plate.
A kind of method for manufacturing the above-mentioned tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase, step is as follows:
(1)Meet the raw material mixing of the chemical composition of the tough ferrite steel plate of the foregoing high strength and low cost containing nanometer precipitated phase Afterwards, ingot casting after smelting stove is smelted, is air-cooled to room temperature, and the thickness of ingot casting is more than 10 times of finished steel plate thickness;
(2)After ingot casting is heated to 1050-1100 DEG C and is incubated uniformly, first edging is into base, and water cooling is to room temperature, first finish to gauge Forging control is at 900-950 DEG C, and the thickness of first edging base is 1.5-3.0 times of finished steel plate thickness;
(3)First edging base is after 900-950 DEG C of air atmosphere solution treatment, water cooling to room temperature;
(4)First edging base after solution treatment in room temperature after total reduction 30-70 % edging again, water cooling to room Temperature;
(5)The base of edging again after water cooling is after 500-600 DEG C of air atmosphere Ageing Treatment 17-24 hours, water cooling to room Temperature, is made the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase.
The anti-oxidant and catharsis of the inventive method combination Ultra-low carbon, Y, is made the MPa of tensile strength >=1020, has no progeny The % of the elongation >=10 inexpensive ferrite steel plate for integrating high-strength tenacity, corrosion resistance and weldability.
Beneficial effects of the present invention are as follows:
1)Addition element Y effect in steel plate of the present invention:Mutually separated out with rich Y nanometers, play precipitation strength and fine grain;Make The oxidation thin skin of steel and it is tightly combined with matrix, the ageing resistance oxidation of steel and corrosion resistance are significantly improved;Make the harmful elements such as As, Sb It is enriched in around rich Y phases, forms nanometer mixed phase, effectively purified steel.
2)The rich nanometer Cu of small size is combined slightly large-sized rich nanometer Y phases, can take into account obdurability, make steel plate of the present invention The MPa of tensile strength >=1020, the % of elongation after fracture >=10.
3)C content is ultralow(≤0.05 wt.%), improve the weldability, toughness and corrosion resistance of steel plate.
4)Without carbide former V, Ti, Nb, Mo and W;Solid solution and Ageing Treatment are carried out all in air atmosphere, Without vacuum or protective atmosphere, technique is simple and convenient to operate, and is made the cost of invention steel and is further reduced.
In a word, by Reasonable Regulation And Control Cu, Ni, Al, Mn, Si, Y content, C content is controlled, at solid solution, deformation and timeliness Reason, forms the institutional framework that Dispersed precipitate on ferrite matrix 2 ~ 10 nm rich Cu phases and 50-100 nm rich Y phases;Fully The anti-oxidant of Y element, purification and fine grain effect are played, " chemical combination between nanocluster+nano-carbide+nano metal is solved The superhigh intensity ferritic steel and its high-carbon of manufacture method of thing " reinforcing, many alloys, air atmosphere Ageing Treatment brittle failure are asked Topic, the % of the MPa of tensile strength >=1020, elongation after fracture >=10 has been made integrates high-strength tenacity, corrosion resistance and weldability Inexpensive ferrite steel plate, can be widely applied to ships, automobile, pipeline, bridge, pressure vessel, ocean engineering, engineering machinery Deng field.
Brief description of the drawings
Fig. 1 is the matrix for the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase that the embodiment of the present invention 1 is manufactured The replica transmission electron microscope photo of middle rich Y nanometers of phases;
Fig. 2 is the matrix for the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase that the embodiment of the present invention 1 is manufactured The replica transmission electron microscope of middle rich Y nanometers of phases and accordingly energy spectrogram;
Fig. 3 is the matrix for the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase that the embodiment of the present invention 1 is manufactured The film high-resolution-ration transmission electric-lens photo of middle rich Cu nanometers of phases;
Fig. 4 is the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase and contrast that the embodiment of the present invention 4 is manufactured The stereoscan photograph of scale on surface after example air atmosphere timeliness;
Fig. 5 is the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase and contrast that the embodiment of the present invention 4 is manufactured The stereoscan photograph of example air atmosphere timeliness after-drawing fracture.
Embodiment
Technical scheme is further illustrated below in conjunction with specific embodiment.
The present invention provides a kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase, by weight percentage Chemical composition:Mn is that 1.0 ~ 1.7 %, Ni are that 2.5 ~ 4.0 %, Al are that 0.5 ~ 1.5 %, Cu is that 1.5 ~ 3.0%, Y is 0.01 ~ 0.10 The % of %, C≤0.05 %, Si≤0.10 %, S≤0.04 %, P≤0.04 %, N≤0.05 %, O≤0.05, remaining is Fe and can not Avoid impurity.
Below to each chemical composition content range of the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase Restriction reason explain:
C:To ensure the superior weldability energy and toughness of steel, using ultralow carbon content.The C content of the present invention is not higher than 0.05 wt.%。
Cu:The main component of nanometer precipitated phase of the present invention, utilizes lower-cost Cu formation disperse nanometer precipitated phases Can efficient hardening ferritic steel;In addition, Cu can also improve corrosion resistance of the steel in air and seawater.Cu contents are too low, and reinforcing is made With weak, and Cu too high levels, be also easy to produce it is hot-short, so Cu content is limited to 1.5 ~ 3.0 % in steel of the present invention.
Ni:One of component of nanometer precipitated phase, participates in the invigoration effect of nanometer precipitated phase, and nanometer can be hindered to separate out Phase is grown up;Ni can also improve the toughness of steel.But can retained austenite and increase production cost, this hair in Ni too high levels, steel Bright Ni content is limited to 2.5 ~ 4.0%.
Mn:One of component of nanometer precipitated phase, participates in the invigoration effect of nanometer precipitated phase.Mn is conducive to refinement iron element Body crystal grain, improves the obdurability of steel, but Mn amounts are too high, and retained austenite is had in steel and causes segregation, poor toughness and weldability Low, Mn of the present invention content is limited to 1.0 ~ 1.7 %.
Al:One of component of nanometer precipitated phase, participates in the invigoration effect of nanometer precipitated phase.Al participates in deoxidation but content It is too high, cause casting difficult, Al of the present invention content is limited to 0.5 ~ 1.5 %.
Y:The main component of another nanometer precipitated phase of the present invention, participates in the invigoration effect of nanometer precipitated phase.This hair The C amounts of bright steel are ultralow, add Y and form rich Y nanometer precipitated phases in the base instead of Carbide Precipitation phase;Y makes harmful member such as As, Sb Element is enriched in around rich Y phases, is formed nanometer mixed phase, has effectively been purified steel;Y is added in steel, have impact on O and Fe diffusion, So that oxidation thin skin that steel is thermally formed in air atmosphere and be tightly combined with matrix, the ageing resistance oxidation of steel is improved and resistance to Corrosion.Because Y is rare metal, too high content does not only result in cost increase, and easily segregation forms larger particle, therefore Y of the present invention content is limited to 0.01 ~ 0.10 %.
Si:Ferrite is dissolved in, solution strengthening effect is played.The toughness of steel can be excessively reduced, Si of the present invention content is limited to 0-0.1 %。
S and P:Inevitable impurity element, is reduced as far as possible in steel, the present invention limit S≤0.04 %, P in steel≤ 0.04 %。
N and O:Inevitable impurity element in steel, endanger steel toughness and weldability, the present invention limit steel in N≤ 0.05 %、O≤0.05 %。
The method that the present invention also provides a kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase described in manufacture, The step of its manufacture method, is as follows:
(1)The raw material mixing that a kind of chemical composition of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase is constituted Thing, ingot casting after smelting stove is smelted is air-cooled to room temperature, and the thickness of ingot casting is 10 times or more of finished steel plate thickness;
(2)After ingot casting is heated to 1050-1100 DEG C and is incubated uniformly, first edging is into base, and water cooling is to room temperature, first finish to gauge Forging control is at 900-950 DEG C, and the thickness of first edging base is 1.5-3.0 times of finished steel plate thickness;
(3)First edging base is after 900-950 DEG C of air atmosphere solution treatment, water cooling to room temperature;
(4)First edging base after solution treatment in room temperature after total reduction 30-70% edging again, water cooling to room Temperature;
(5)The base of edging again after water cooling is after 500-600 DEG C of air atmosphere Ageing Treatment 17-24 hours, water cooling to room Temperature, is made the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase.
The method of the tough ferrite steel plate of high strength and low cost containing nanometer precipitated phase described in a kind of manufacture of the present invention, Can using the melting raw mixture such as induction furnace, converter, electric arc furnaces, then can using mold or continuous casting by the way of be formed steel ingot or Continuous casting billet.The thickness of steel ingot or continuous casting billet is into 10 times of base steel plate thickness or more, with ensure finished steel plate deformation it is uniform and There is fine grain effect.Steel ingot or continuous casting billet are heated to after 1050-1100 DEG C of scope and insulation uniformly, are rolled or are forged into for the first time Slab, first to roll or the final temperature of forging is controlled at 900-950 DEG C, then water cooling is to room temperature.The thickness of first edging base For 1.5-3.0 times of finished steel plate thickness, to ensure follow-up dislocation strengthening requirement.First edging base is again through 900-950 DEG C of sky Water cooling is to room temperature after gas atmosphere solution treatment, the first edging base after solution treatment in room temperature through total reduction 30-70 % again Secondary edging, water cooling to room temperature.Control 30-70 % total reductions be in order to ensure enough dislocation densities, enhancing next step when Effect separates out effect, also for avoiding the formation of too strong texture.When the base of edging again after water cooling is through 500-600 DEG C of air atmosphere After effect processing 17-24 hours, the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase is made in water cooling to room temperature.
The present invention is described in further detail by the following examples.
Embodiment 1
Manufacturing step:
1)The chemical composition of embodiment 1 as shown in table 1 smelting molten steel in vaccum sensitive stove, is molded into steel ingot, air cooling To room temperature.The thickness of steel ingot is 300 mm.
2)Multistage hot deformation, 1050 DEG C of start rolling temperature will be started after Heating Steel Ingots to 1100 DEG C of 1.5 h of insulation.When rolled piece is thick When spending for 7 mm, rolling, 920 DEG C of finishing temperature, rolled piece water cooling to room temperature are terminated.
3)Rolled piece is heated to 900 DEG C in air atmosphere, after 0.5 h of insulation immediately water cooling to room temperature.Then by rolled piece After room temperature is rolled to the mm of finished product thickness 2.5, water cooling to room temperature.
4)Steel plate after room temperature is rolled, is heated to 550 DEG C of 17 h of insulation in air atmosphere, and insulation terminates rear water cooling to room Temperature, finished product rolled plate.
5) the rich Cu phases and the average-size of richness Y phases separated out in finished product rolled plate is respectively 6 nm and 80 nm.Rich Cu The composition of phase is(wt.%):5.45Al, 4.90Mn, 23.54Fe, 20.68Ni, 45.13Cu, 0.29Y;Rich Y phases are:18.08Al, 19.66Ni, 27.58Y, 9.34Cu, 10.96As, 12.86Sb, 1.15Mn, 0.38Fe.Per cu μ m nanometer phase amount 8 × 106It is individual, wherein richness Y phases account for 1.5 %.
Embodiment 2
Manufacturing step:
1)The chemical composition of embodiment 2 as shown in table 1 smelting molten steel in electric arc furnaces, is molded into steel ingot, is air-cooled to room Temperature.The thickness of steel ingot is 200mm.
2)Multistage hot deformation, 1030 DEG C of start rolling temperature will be started after Heating Steel Ingots to 1080 DEG C of 1.8 h of insulation.When rolled piece is thick When spending for 6 mm, rolling, 900 DEG C of finishing temperature, rolled piece water cooling to room temperature are terminated.
3)Rolled piece is heated to 920 DEG C in air atmosphere, after 0.5 h of insulation immediately water cooling to room temperature.Then by rolled piece After room temperature is rolled to the mm of finished product thickness 2.0, water cooling to room temperature.
4)Steel plate after room temperature is rolled, is heated to 580 DEG C of 20 h of insulation in air atmosphere, and insulation terminates rear water cooling to room Temperature, finished product rolled plate.
5) the rich Cu phases and the average-size of richness Y phases separated out in finished product rolled plate is respectively 10 nm and 99 nm.Often stand Square micron/nano phase amount is 5 × 104It is individual, wherein richness Y phases account for 2 %.
Embodiment 3
Manufacturing step:
1)The chemical composition of embodiment 3 as shown in table 1 smelting molten steel in induction furnace, is molded into steel ingot, is air-cooled to room Temperature.The thickness of steel ingot is 100mm.
2)Multistage hot deformation, 1010 DEG C of start rolling temperature will be started after Heating Steel Ingots to 1050 DEG C of 2.0 h of insulation.When rolled piece is thick When spending for 3 mm, rolling, 905 DEG C of finishing temperature, rolled piece water cooling to room temperature are terminated.
3)Rolled piece is heated to 945 DEG C in air atmosphere, after 0.5 h of insulation immediately water cooling to room temperature.Then by rolled piece After room temperature is rolled to the mm of finished product thickness 1.0, water cooling to room temperature.
4)Steel plate after room temperature is rolled, is heated to 500 DEG C of 24 h of insulation in air atmosphere, and insulation terminates rear water cooling to room Temperature, finished product rolled plate.
5) the rich Cu phases and the average-size of richness Y phases separated out in finished product rolled plate is respectively 2 nm and 50 nm.Often stand Square micron/nano phase amount is 9 × 105It is individual, wherein richness Y phases account for 0.2 %.
The chemical composition of the invention steel embodiment of table 1 and comparative example(Percentage by weight)
Numbering Cu Ni Al Mn Y C Si Fe
Embodiment 1 2.70 3.85 1.10 1.50 0.08 0.03 0.07 Surplus
Embodiment 2 1.90 4.00 1.00 1.60 0.10 0.03 0.05 Surplus
Embodiment 3 3.00 2.90 1.50 1.20 0.02 0.04 0.03 Surplus
Embodiment 4 2.50 4.00 1.00 1.50 0.06 0.04 0.04 Surplus
Embodiment 5 2.50 4.00 1.00 1.50 0.01 0.05 0.04 Surplus
Embodiment 6 2.50 4.00 1.00 1.50 0.04 0.04 0.03 Surplus
Comparative example 2.50 4.00 1.00 1.50 0 0.05 0.04 Surplus
Embodiment 4,5,6 and comparative example
The chemical composition of embodiment 4,5,6 and comparative example is basically identical in addition to Y.The real system of embodiment 4,5,6 and comparative example Make step as follows:
1)The chemical composition of embodiment 4,5,6 and comparative example as shown in table 1 smelting molten steel in vaccum sensitive stove, molding Into steel ingot, room temperature is air-cooled to.The thickness of steel ingot is 200mm.
2)Multistage hot deformation, 1050 DEG C of start rolling temperature will be started after Heating Steel Ingots to 1100 DEG C of 2 h of insulation.When rolled piece thickness During for 4 mm, rolling, 900 DEG C of finishing temperature, rolled piece water cooling to room temperature are terminated.
3)Rolled piece is heated to 900 DEG C in air atmosphere, after 0.5 h of insulation immediately water cooling to room temperature.Then by rolled piece After room temperature is rolled to the mm of finished product thickness 1.5, water cooling to room temperature.
4)Steel plate after room temperature is rolled, is heated to 550 DEG C of 17 h of insulation in air atmosphere, and insulation terminates rear water cooling to room Temperature, finished product rolled plate.
Table 2 lists the mechanical property of all embodiments of the invention and comparative example.
The mechanical property of the invention steel embodiment of table 2 and comparative example
Numbering Tensile strength/MPa Have no progeny elongation/%
Embodiment 1 1120 12
Embodiment 2 1050 14
Embodiment 3 1200 10
Embodiment 4 1090 12
Embodiment 5 1020 13
Embodiment 6 1050 13
Comparative example 1000 10

Claims (4)

1. a kind of tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase, it is characterised in that by weight percentage Chemical composition is as follows:Mn be 1.0 ~ 1.7 %, Ni be 2.5 ~ 4.0 %, Al be 0.5 ~ 1.5 %, Cu be 1.5 ~ 3.0%, Y be 0.01 ~ The % of 0.10 %, C≤0.05 %, Si≤0.10 %, S≤0.04 %, P≤0.04 %, N≤0.05 %, O≤0.05, remaining is Fe With inevitable impurity.
2. the tough ferrite steel plate of high strength and low cost according to claim 1, it is characterised in that described nanometer precipitated phase is Size is 2 ~ 10 nm rich Cu phases and 50-100 nm rich Y phases, and per cu μ m, nanometer phase amount is 5 × 104 ~ 8×106 It is individual, wherein richness Y phases account for 0.2 ~ 2 %.
3. the tough ferrite steel plate of high strength and low cost according to claim 2, it is characterised in that the member in shown rich Cu phases Element is based on Cu, also containing Ni, Al, Mn element;Element in described rich Y phases based on Y, also containing Ni, Al, Mn and As, Sb element.
4. the manufacture method of the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase described in claim 1, its feature It is, step is as follows:
(1)After the raw material mixing for the chemical composition for meeting the tough ferrite steel plate of the foregoing high strength and low cost containing nanometer precipitated phase, Ingot casting after smelting stove is smelted, is air-cooled to room temperature, and the thickness of ingot casting is more than 10 times of finished steel plate thickness;
(2)After ingot casting is heated to 1050-1100 DEG C and is incubated uniformly, first edging is into base, and water cooling is to room temperature, first finish to gauge forging control System is at 900-950 DEG C, and the thickness of first edging base is 1.5-3.0 times of finished steel plate thickness;
(3)First edging base is after 900-950 DEG C of air atmosphere solution treatment, water cooling to room temperature;
(4)First edging base after solution treatment in room temperature after total reduction 30-70 % edging again, water cooling to room temperature;
(5)The base of edging again after water cooling is after 500-600 DEG C of air atmosphere Ageing Treatment 17-24 hours, water cooling to room temperature, system Obtain the tough ferrite steel plate of the high strength and low cost containing nanometer precipitated phase.
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