CN106636961B - One kind mutually strengthens easily welding steel and preparation method containing Cu nanometers - Google Patents
One kind mutually strengthens easily welding steel and preparation method containing Cu nanometers Download PDFInfo
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Abstract
Mutually strengthen easily welding steel and preparation method containing Cu nanometers the present invention is to provide one kind.Percentage by weight forms：C<0.05、Si:0.1~0.3, Mn:0.5~1.5, S<0.002、P<0.004、Cu:1.5~2.5, Ni:4~8, Al:0.3~0.8, Mo:0.2~1, Cr<1、Nb:0.01~0.04, Ti:0.01~0.05, V:0.01~0.08, remaining is Fe and inevitable impurity element.Induction melting and casting are carried out in the case where argon gas is protective gas；Ingot casting heats 1 3h at 1,100 1200 DEG C, directly carries out hot rolling, 1,050 1150 DEG C of hot rolling initial temperature, 950 DEG C of finishing temperature, supper-fast high pressure water cooling after finish to gauge, and hot rolling deformation amount is 50% 90%；Steel plate after rolling is selectively dissolved and aging strengthening model after obtain the easy weldability steel of high-intensity and high-tenacity.The alloy hardness of steel of the present invention is high, and plasticity is good, low-temperature impact resistance good toughness, easily welding.And processing technology controllability is big, and cost is relatively low, easy to operate.
Description
Technical field
The present invention relates to a kind of easily welding steel, and the present invention also relates to a kind of preparation method of easily welding steel.
Background technology
Cupric nanometer phase low-alloy steel, while with high intensity, it may have good extensibility, low-temperature impact toughness
With easy welding performance, therefore shipbuilding, automobile making, building, the field of bridge suffer from more wide application.One
As the yield strength of low-alloy steel be usually less than 700MPa, and usually have but be difficult to ensure that while high intensity it is good low
Warm toughness and welding performance.
Traditional high intensity steel capital is the higher martensite of phosphorus content or lower bainite tissue, and a large amount of of carbon introduce greatly
The big welding performance for reducing material.Material is uniform to ensure core structure at the same time, it is necessary to ensure that the steel plate compared with think gauge has
Enough quenching degree, needs in steel to add the alloying elements such as Ni, Cr, Mo of high level.The intensity rank requirement of steel is higher, adds
The content of the alloying element added also accordingly increases, and cost of alloy improves naturally.With the raising of intensity, the carbon equivalent of steel significantly increases
Add, the welding performance of steel is greatly reduced in this.
At present, delivered both at home and abroad using alloying element and controlled rolling and controlled cooling is added and obtained the low-alloy steel of high intensity, by force
Rank is spent more than 800MPa all it is difficult to ensure that preferable elongation percentage, does not characterize its cryogenic property yet.
In the patent document of Publication No. CN103361566A, disclose a kind of by controlling casting, rolling and heat treatment
Technique, the cupric low-alloy steel of obtained high-strength and high ductility.But its yield strength is less than 850MPa.
In the patent document of Publication No. CN102140606A, one kind is disclosed by controlling hot rolling each passage interval time
And deflection, cooldown rate and Isothermal Treatment, the obtained high low-alloy multi-phase Steels of hot rolling.Its yield strength 800MPa, but
Only 20% or so, low-temperature flexibility does not specify elongation percentage.
In the patent document of Publication No. CN104513927A, a kind of height obtained using isothermal heat treatment process is disclosed
Strength steel sheet.Its yield strength is more than 390MPa, and tensile strength 800MPa, -20 DEG C of ballistic work is only 100J.
The content of the invention
It is an object of the invention to provide a kind of intensity is high, good containing Cu nanometer, mutually reinforcing is easily with low-temperature flexibility for plasticity
Weld steel.The present invention also aims to provide a kind of to efficiently control matrix phase and the microstructure and crystalline substance of nanometer precipitated phase
Particle size mutually strengthens the preparation methods for easily welding steel containing Cu nanometers.
Mutually strengthening easily welding steel its percentage by weight containing Cu nanometer and forming for the present invention be：C<0.05、Si:0.1~0.3,
Mn:0.5~1.5, S<0.002、P<0.004、Cu:1.5~2.5, Ni:4~8, Al:0.3~0.8, Mo:0.2~1, Cr<1、
Nb:0.01~0.04, Ti:0.01~0.05, V:0.01~0.08, remaining is Fe and inevitable impurity element.
The present invention containing Cu nanometer mutually strengthen easily weld steel preparation methods be：By design component under argon gas protective condition
Induction melting and casting are carried out, ingot casting heats 1~3h at 1100~1200 DEG C and carries out optimization annealing, afterwards using controlled rolling and controlled cooling
Technology is rolled, and the rolling was specifically included with the next stage：
First stage is roughing, and the ingot casting of homogenizing annealing directly carries out roughing, and roughing initial temperature is 1050~1150
DEG C, finishing temperature is 1000~1050 DEG C, and roughing overall compression ratio is 50~80%；
Second stage is finish rolling, and finish rolling initial temperature is 950~1000 DEG C, and finishing temperature is 850~900 DEG C, and finish rolling is total
Compression ratio is 10%-30%；
Phase III is quick water cooling, and the quick cooling of direct voltage watering after finish rolling, final cooling temperature is below 50 DEG C.
Steel plate after controlled rolling and controlled cooling is dissolved and ageing treatment, and solid solubility temperature is 800 DEG C~1000 DEG C, and soaking time is
5 minutes~2 it is small when, quick water cooling to room temperature afterwards；Aging temp is 500 DEG C~700 DEG C, when soaking time 5 minutes~10 is small,
Quick water cooling is to room temperature afterwards.
Mutually strengthen high-intensity and high-tenacity containing Cu nanometers the present invention provides one kind and easily weld steel and preparation method, the present invention is logical
The proportionate relationship of control Cu, Mn, Ni, Al essential element is crossed, and adds other alloying elements, in addition rational rolling mill practice and heat
Treatment process, has efficiently controlled matrix phase and the microstructure and crystallite dimension of nanometer precipitated phase, so as to obtain a kind of high-strength
The easy welding steel of degree, good plasticity and low-temperature flexibility.
Acting as key component included in steel is easily welded in mutually strengthening containing Cu nanometers for the present invention：
Cu：Cu is austenite stabilizer element, can reduce austenite transformation temperature, suppresses the generation of high temperature transformation product,
Transformation and structure refinement to tissue have an impact.Meanwhile Cu can be induced under certain heat treatment condition and be separated out tiny sink
Shallow lake phase, and the alloying elements such as Ni, Al, Mn is polymerize to the precipitation phase precursor, copper-rich nanometer phase is formed, the copper-rich nanometer is mutually strong
Changing effectively can replace carbon to strengthen, so as to reduce carbon content.Therefore, the intensity of steel, corrosion resistant can be improved by adding a certain amount of copper
Corrosion, fatigue resistance, improve creep strength and impact flexibility, while the welding performance, processability and machine that improve material add
Work performance etc..
Ni：The Ni of solution can improve ferritic intensity, when Ni contents raise, can guarantee that same compared with high-ductility
Shi Tigao intensity.When Ni contents raise, intensity is improved while can guarantee that compared with high-ductility.Ni also ensures the uniform of Steel Properties
Property, significantly improve low-temperature impact toughness.
Al：Al in steel has the function that the ability of deoxidation and denitrogenation.A small amount of Al has the timeliness effect for suppressing mild steel,
Crystal grain thinning, improve impact flexibility, reduce steel cold brittleness transition temperature effect.Al does not have carbide, and aluminium oxide belongs to hard
Crisp phase.When aluminium content is higher, during forging rolling, alumina particle forms bar along machine direction, influences the modeling of steel
Toughness.
Mn：Effects of the Mn in steel is deoxidation desulfuration.Mn has certain effect in terms of solution strengthening in steel, in addition Mn
It is additionally favorable for improving the mechanical property such as obdurability and processing performance quenching degree and hot-working character of steel.But Mn content mistakes in steel
Height can influence steel and segregation phenomena is produced in casting, and rolling is easy to crack.
The present invention containing Cu nanometer mutually strengthen easily weld steel in each element, particularly compared with precious metal element content compared with
It is few so that the cost of the steel is greatly reduced.
The alloy design Precise components proportioning of the present invention, while its intensity is ensured, its carbon equivalent ce and cold crack are quick
Sense indices P cm values are relatively low, and postwelding heat affected area is not likely to produce cold cracking inclination so that the alloy of the invention has welding well
Performance, it is i.e. solderable in the case where not preheating or preheating temperature being relatively low.
The operation of rolling of the present invention uses advanced Controlled Rolling And Controlled Cooling, fast with process velocity, temperature control and slippage essence
The advantages that standard, cooldown rate are high, sheet deformation is uniform.By controlling the roughing temperature in austenite recrystallization area, roughing deflection,
And austenite or austenite-ferrite two-phase section final rolling temperature, the type of cooling and cooldown rate are controlled, controls matrix phase
Microstructure and size, therefore the alloy is just provided with preferable comprehensive mechanical property in rolling state.Also it is heat treatment then
Technique expands opereating specification.
On the basis of rolling mill practice, the present invention is used and is reasonably dissolved with aging treatment process to mutually high-strength containing Cu nanometers
The mechanical property that degree high tenacity easily welds steel is further optimized.By rational solution treatment, make austenite structure
Phase transformation, forms polygon sections ferritic or acicular ferrite.Then pass through rational aging temp and timeliness time control nanometer
Separate out, the precipitate size and number density matching, nanometer precipitated phase for obtaining optimization are uniformly distributed in the base, the resistance to dislocation
Effect is hindered to significantly improve intensity, simultaneously because precipitated phase core is softer Cu elements, dislocation use cuts through mechanism and passes through precipitation
Phase, therefore plasticity does not significantly reduce while intensity improves.Ni elements are added in steel, crystal grain thinning, strengthens crystal boundary, low
Warm toughness significantly improves.
To sum up, phosphorus content and carbon equivalent are relatively low in low-alloy steel of the invention, have superelevation intensity while keep
Good plasticity and toughness, relatively low carbon equivalent to be not readily available martensitic structure during cooling is welded, have
Excellent welding performance, this reduces shipbuilding industry material cost and welding cost and its important.Cupric nanometer mutually strengthens height
Strength high toughness easily weld steel be on the basis of ultralow carbon alloy steel designing technique, added in steel a certain amount of Cu, Mn,
The alloying elements such as Ni, Al, obtain the precipitated phase of nano-grade size after Wetted constructures, which is remarkably improved material
Intensity, compensate for the loss of strength brought due to drop C, while adding other microalloy elements makes the steel have high intensity, Gao Yan
Malleability, good low-temperature flexibility and welding performance.
Brief description of the drawings
Fig. 1 is metallograph of the embodiment 1 using the present invention.
Fig. 2 is metallograph of the embodiment 2 using the present invention.
Fig. 3 is metallograph of the embodiment 3 using the present invention.
Fig. 4 is metallograph of the embodiment 4 using the present invention.
Fig. 5 is metallograph of the embodiment 5 using the present invention.
Embodiment
Technical scheme is described in detail below by way of specific embodiment, it should be understood that these implementations
Example is to be used to illustrate the present invention, rather than limitation of the present invention, and the present invention is done under the concept thereof of the present invention and is simply changed
Into belonging to the scope of protection of present invention.
Embodiment 1：
The present embodiment is that one kind contains Cu nanometers of phase high-strength and high-ductility low-alloy steel and preparation method, the chemical composition of alloy
(mass percent) is：C<0.05, Si:0.2, Mn:1, S:<0.003, P:<0.004, Cu:2, Ni:4, Al:0.5, Nb:0.03,
Ti:0.05, surplus is Fe and inevitable impurity.After 1150 DEG C of insulation 2h carry out homogenizing annealing on tandem-rolling continuous casting machine
Rolled；Roughing start rolling temperature is 1000 DEG C, rolls 4 passages, average each drafts 12%, total reduction 50%, rolling
Temperature control is between 950 DEG C~1050 DEG C；Finish rolling start rolling temperature is 800 DEG C, rolls 6 passages, does not have reduction in pass 15%, always
Reduction ratio 80%, finishing temperature are no more than 850 DEG C, and finish to gauge thickness is 14mm；Watered after rolling using ultrafast cooling rate, final cooling temperature exists
Less than 50 DEG C.Solid solution and ageing treatment are not suffered from.Metallographic structure photo is shown in Fig. 1, its mechanical property is shown in Table 1
Embodiment 2：
The present embodiment is that one kind contains Cu nanometers of phase high-strength and high-ductility low-alloy steel and preparation method, the chemical composition of alloy
(mass percent) is：C<0.05, Si:0.2, Mn:1, S:<0.003, P:<0.004, Cu:2, Ni:4, Al:0.5, Nb:0.03,
Ti:0.05, surplus is Fe and inevitable impurity.After 1150 DEG C of insulation 2h carry out homogenizing annealing on tandem-rolling continuous casting machine
Rolled；Roughing start rolling temperature is 1000 DEG C, rolls 4 passages, average each drafts 12%, total reduction 50%, rolling
Temperature control is between 950 DEG C~1050 DEG C；Finish rolling start rolling temperature is 800 DEG C, rolls 6 passages, does not have reduction in pass 15%, always
Reduction ratio 80%, finishing temperature are no more than 850 DEG C, and finish to gauge thickness is 14mm；Watered after rolling using ultrafast cooling rate, final cooling temperature exists
Less than 50 DEG C.Solution treatment, soaking time 2h are carried out at 800 DEG C.Ageing treatment, soaking time 1h are carried out at 550 DEG C.Metallographic group
Knit photo and see Fig. 2, its mechanical property is shown in Table 1
Embodiment 3：
The present embodiment is that one kind contains Cu nanometers of phase high-strength and high-ductility low-alloy steel and preparation method, the chemical composition of alloy
(mass percent) is：C<0.05, Si:0.2, Mn:1, S:<0.003, P:<0.004, Cu:2, Ni:6, Al:0.5, Mo:0.5,
Cr:0.5, Nb:0.03, Ti:0.05, surplus is Fe and inevitable impurity.2h, which is kept the temperature, at 1150 DEG C carries out homogenizing annealing
Rolled afterwards on tandem-rolling continuous casting machine；Roughing start rolling temperature is 1000 DEG C, rolls 4 passages, averagely each drafts 12%, always
Reduction ratio 50%, rolling temperature are controlled between 950 DEG C~1050 DEG C；Finish rolling start rolling temperature is 900 DEG C, rolls 6 passages, does not have
Secondary drafts 15%, total reduction 80%, finishing temperature are no more than 920 DEG C, and finish to gauge thickness is 14mm；Ultrafast cooling rate is used after rolling
Watering, final cooling temperature is below 50 DEG C.Ageing treatment, soaking time 2h are carried out at 550 DEG C.Metallographic structure photo is shown in Fig. 3, its power
Learn performance and be shown in Table 1
Embodiment 4：
The present embodiment is that one kind contains Cu nanometers of phase high-strength and high-ductility low-alloy steel and preparation method, the chemical composition of alloy
(mass percent) is：C<0.05, Si:0.2, Mn:1, S:<0.003, P:<0.004, Cu:2, Ni:6, Al:0.5, Nb:0.03,
Ti:0.05, surplus is Fe and inevitable impurity.After 1150 DEG C of insulation 2h carry out homogenizing annealing on tandem-rolling continuous casting machine
Rolled；Roughing start rolling temperature is 1000 DEG C, rolls 4 passages, average each drafts 12%, total reduction 50%, rolling
Temperature control is between 950 DEG C~1050 DEG C；Finish rolling start rolling temperature is 800 DEG C, rolls 6 passages, does not have reduction in pass 15%, always
Reduction ratio 80%, finishing temperature are no more than 850 DEG C, and finish to gauge thickness is 14mm；Watered after rolling using ultrafast cooling rate, final cooling temperature exists
Less than 50 DEG C.Solution treatment is carried out at 880 DEG C, soaking time 5min, ageing treatment, soaking time 1h are carried out at 565 DEG C.Metallographic
Macrograph is shown in Fig. 4, its mechanical property is shown in Table 1
Embodiment 5：
The present embodiment is that one kind contains Cu nanometers of phase high-strength and high-ductility low-alloy steel and preparation method, the chemical composition of alloy
(mass percent) is：C<0.05, Si:0.2, Mn:1, S:<0.003, P:<0.004, Cu:2, Ni:6, Al:0.5, Nb:0.03,
Ti:0.05, surplus is Fe and inevitable impurity.After 1150 DEG C of insulation 2h carry out homogenizing annealing on tandem-rolling continuous casting machine
Rolled；Roughing start rolling temperature is 1000 DEG C, rolls 4 passages, average each drafts 12%, total reduction 50%, rolling
Temperature control is between 950 DEG C~1050 DEG C；Finish rolling start rolling temperature is 800 DEG C, rolls 6 passages, does not have reduction in pass 15%, always
Reduction ratio 80%, finishing temperature are no more than 850 DEG C, and finish to gauge thickness is 14mm；Watered after rolling using ultrafast cooling rate, final cooling temperature exists
Less than 50 DEG C.Solution treatment is carried out at 880 DEG C, soaking time 44min, ageing treatment, soaking time 73min are carried out at 540 DEG C.
Metallographic structure photo is shown in Fig. 5, its mechanical property is shown in Table 1.
The mechanical property of 1 invention steel of table
Claims (3)
1. one kind mutually strengthens easily welding steel containing Cu nanometers, it is characterized in that percentage by weight composition is：C<0.05、Si:0.1~0.3,
Mn:0.5~1.5, S<0.002、P<0.004、Cu:1.5~2.5, Ni:4~8, Al:0.3~0.8, Mo:0.2~1, Cr<1、
Nb:0.01~0.04, Ti:0.01~0.05, V:0.01~0.08, remaining is Fe and inevitable impurity element, according to such as
Lower section method prepares obtained mutually strengthen containing Cu nanometers and easily welds steel：
Induction melting and casting are carried out under argon gas protective condition by design component, ingot casting heats 1~3h at 1100~1200 DEG C
Homogenizing annealing is carried out, is rolled afterwards using Controlled Rolling And Controlled Cooling, the rolling was specifically included with the next stage：
First stage is roughing, and the ingot casting of homogenizing annealing directly carries out roughing, and roughing initial temperature is 1050~1150 DEG C, eventually
Temperature is rolled for 1000~1050 DEG C, and roughing overall compression ratio is 50~80%；
Second stage is finish rolling, and finish rolling initial temperature is 950~1000 DEG C, and finishing temperature is 850~900 DEG C, finish rolling total compression
Than for 10%-30%；
Phase III is quick water cooling, and the quick cooling of direct voltage watering after finish rolling, final cooling temperature is below 50 DEG C.
2. it is a kind of containing the Cu nanometers of preparation methods for mutually strengthening easily welding steel, it is characterized in that：Composition is by weight percentage：C<
0.05、Si:0.1~0.3, Mn:0.5~1.5, S<0.002、P<0.004、Cu:1.5~2.5, Ni:4~8, Al:0.3~0.8,
Mo:0.2~1, Cr<1、Nb:0.01~0.04, Ti:0.01~0.05, V:0.01~0.08, remaining is for Fe and inevitably
The design component of impurity element carries out induction melting and casting under argon gas protective condition, and ingot casting heats 1 at 1100~1200 DEG C
~3h carries out homogenizing annealing, is rolled afterwards using Controlled Rolling And Controlled Cooling, the rolling was specifically included with the next stage：
First stage is roughing, and the ingot casting of homogenizing annealing directly carries out roughing, and roughing initial temperature is 1050~1150 DEG C, eventually
Temperature is rolled for 1000~1050 DEG C, and roughing overall compression ratio is 50~80%；
Second stage is finish rolling, and finish rolling initial temperature is 950~1000 DEG C, and finishing temperature is 850~900 DEG C, finish rolling total compression
Than for 10%-30%；
Phase III is quick water cooling, and the quick cooling of direct voltage watering after finish rolling, final cooling temperature is below 50 DEG C.
3. it is according to claim 2 containing the Cu nanometers of preparation methods for mutually strengthening easily welding steel, it is characterized in that：After controlled rolling and controlled cooling
Steel plate be dissolved and ageing treatment, solid solubility temperature is 800 DEG C~1000 DEG C, soaking time for 5 minutes~2 it is small when, afterwards
Quick water cooling；Aging temp is 500 DEG C~700 DEG C, when soaking time 5 minutes~10 is small, quick water cooling afterwards.
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| CN114164374A (en) * | 2021-11-12 | 2022-03-11 | 哈尔滨工程大学 | 850 MPa-grade high-strength high-toughness easy-welding nano steel with thickness of 5-60 mm and preparation method thereof |
| CN114164315B (en) * | 2021-11-12 | 2023-02-14 | 哈尔滨工程大学 | 1000 MPa-grade high-strength high-toughness easy-welding nano steel with thickness of 60-120 mm and preparation method thereof |
| CN114058815B (en) * | 2021-11-12 | 2023-12-19 | 哈尔滨工程大学 | 1150 MPa-level high-strength high-toughness easily-welded nano steel and preparation method thereof |
| CN114058960B (en) * | 2021-11-12 | 2023-03-17 | 哈尔滨工程大学 | High-strength high-toughness easy-welding nano steel with thickness of 25-60 mm and thickness of 1000MPa and preparation method thereof |
| CN114480988B (en) * | 2021-12-27 | 2023-01-06 | 北京科技大学 | Multiphase composite high-strength high-toughness low-density steel and preparation method thereof |
| CN114807774B (en) * | 2022-06-21 | 2023-05-30 | 育材堂（苏州）材料科技有限公司 | Hot work die steel, heat treatment method thereof and hot work die |
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Application publication date: 20170510 Assignee: SICHUAN HONGJIAN HEAVY MACHINERY MANUFACTURING Co.,Ltd. Assignor: HARBIN ENGINEERING University Contract record no.: X2022230000100 Denomination of invention: A kind of Cu-containing nano-phase reinforced easy-to-weld steel and preparation method Granted publication date: 20180424 License type: Common License Record date: 20220922 |