CN104451408B - Strong bainitic steel of carbon superelevation and preparation method thereof in one - Google Patents
Strong bainitic steel of carbon superelevation and preparation method thereof in one Download PDFInfo
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- CN104451408B CN104451408B CN201410729877.4A CN201410729877A CN104451408B CN 104451408 B CN104451408 B CN 104451408B CN 201410729877 A CN201410729877 A CN 201410729877A CN 104451408 B CN104451408 B CN 104451408B
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Abstract
The invention discloses carbon ultra-high strength bainite in one, the mass percent of its chemical composition is C:0.28～0.5%, Si:1.0～1.7%, Mn:1.8～3.0%, Cr:1.0～1.6%, Mo:0～0.3%, Co:0～0.5%, Al:0.6～1.3%, P :≤0.015%, S :≤0.01%, N :≤0.01%, remaining is Fe and inevitable impurity.According to mentioned component smelting, casting gained blank through 1150～1200 DEG C of soaking post-treatment to required size, it is quickly cooled to isothermal temperature again after complete austenitizing is heated, isothermal processes is replaced at 250～270 DEG C and 280～300 DEG C of intervals, alternate cycle 0.1～1 hour, process 3 24 hours then air cooling to room temperature.The bainitic steel production cost welding low, easy of the present invention, anti-delayed fracture, excellent combination property.
Description
Technical field
The invention belongs to metal material field, relate to carbon ultra-high strength bainite and preparation method thereof in one.
Background technology
The intensity of steel improves along with the increase of carbon content, but its plasticity and toughness degradation, how to realize intensity and mould
The excellent fit ratio of toughness, it has also become the important topic of steel development.More study discovery, under the conditions of identical carbon equivalent,
The steel with bainite structure has more preferable anti-delayed fracture performance, fatigue strength, fracture toughness and percentage elongation.Therefore same
Under the conditions of carbon equivalent, bainitic steel have the service life more longer than martensitic structure steel or bainite/martensite multi-phase steel and
Higher application safety coefficient.For having the bainitic steel of lath bainitic ferrite, width of sheet refine to nanoscale
It it is the important channel improving its intensity.
A kind of Fe-C (0.6～1.1%)-Si disclosed in Mawella et al. (United States Patent (USP) US 6884306B1) (1.5～
2.0%)-Mn (1.8～4.0%)-Cr (1.2～1.4%)-Ni (0～3%)-Mo (0.2～0.5%)-V (0.1～0.2%)
The high-carbon steel of alloy system, after the long-time homo genizing annelaing of high temperature, carries out 1～3 time-of-weeks through austenitizing in slightly above Ms temperature
Isothermal processes, the carbide-free Bainite of the bainite ferrite+retained austenite structure of nano-grade size can be obtained, so
Structure can reach good combination property, there is superhigh intensity and higher fracture toughness.In addition, U.K. Ministry of Defence
(Chinese invention patent CN 102112644A) also utilize Fe-C (0.6～1.1%)-Si (1.5～2.0%)-Mn (0.3～
1.8%) high-carbon steel of-Cr (1.0～1.5%)-Ni (0～3%)-Mo (0.2～0.5%)-V (0.1～0.2%) alloy system leads to
Cross the isothermal process up to 100h to prepare tensile strength and reach the super-high strength steel of 2048MPa, isothermal time 70h, but its room temperature
Impact flexibility is only 4～7J.For obtaining nanometer bainite structure, all there is the place higher, hot of phosphorus content in steel in above two method
The shortcoming that reason isothermal time is long, on the one hand directly results in impact flexibility and reduces, and welding performance deteriorates, on the other hand, and its technique
It is unfavorable for commercial production.
At present, the way of bainitic steel acceleration acquisition nanometer lath structure has multiple:
Method 1: Chinese invention patent CN 102112644A with the addition of about in steel containing C (0.6～1.1%) high-carbon steel
The Co element of 1.5% and the Al element of 1%, shorten the isothermal processes time.
Method 2: Chinese invention patent CN 103468906A utilizes high-carbon steel (Fe-0.91%C-1.65%Si-2.07%
Mn-1.26%Cr-0.25%Mo-0.08%V-0.06%Nb) before bainite transformation, carry out warm-rolling process, increase dislocation close
Degree so that bainite nucleation site is increased, accelerates bainite transformation.
Method 3: utilize high-carbon steel (Fe-0.79%C-1.56%Si-1.98Mn-1.01Cr-0.24Mo-1.51%Co-
The stress (tension or compressive stress) 1.01%Al) applying certain time during bainite transformation accelerates bainite transformation,
But this mode has strict requirements to the method for clamping of steel, it is unfavorable for large-scale commercial production.
Method 4: by reducing austenitizing temperature and shortening austenitizing time so that austenite grain size refines,
More nucleation site is provided so that bainitic transformation accelerates for bainite transformation.
Said method carbon content in Design of Chemical Composition is high, and noble alloy (Nb, V, Co, Ni) constituent content is high, heat treatment
Overlong time, causes complicated process of preparation, alloy and production cost high, is unfavorable for industrialized production and sizable application.
In order to quickly obtain bainite, it is also possible to played a role by alloying element:
C: reduce carbon element content and bainite transformation district can be made to move to left, shorten bainitic transformation stage of incubation, but too reduce
Carbon content can cause Ms point significantly to raise, and bainite structure is roughened, and too low carbon content can make the solution strengthening of carbon gap make
With decline, the intensity of steel is caused to significantly reduce.Reduce carbon element content and can improve the welding performance of steel.
Si: non-carbide alloying element, Si dissolubility in cementite is extremely low, thus it is stable to expand retained austenite
District so that the mixture of bainite ferrite and retained austenite can be formed；Add appropriate Si element and be conducive to Non-carbonized
The formation of bainite
Co: non-carbide alloying element, can increase the free energy of γ-Fe → α-Fe, makes bainitic transformation district move to left, and shortens
Bainitic transformation stage of incubation, improves bainite phase growth rate.But Co element price is costly, is unfavorable for large-scale industry
Produce.
Al: increase the free energy of γ-Fe → α-Fe, it is possible to make bainitic transformation district move to left, and Al element is at carbide
In dissolubility relatively low, it is possible to suppress further the precipitation of carbide, the increase of Al element and then can suitably reduce Si element and contain
Amount, can make steel reduce cost of alloy further.
In order to obtain the high strength bainite steel with nanometer width of sheet, in addition it is also necessary to add following alloying element:
Mn: manganese increases the quenching degree of bainitic steel, improves intensity and the toughness of steel.
Cr:Cr element is primarily used to increase the quenching degree of bainitic steel, and Cr element can expand bainite in CCT curve and turn
Become district, improve the stability of overcooling austenite.
Mo:Mo can suppress bainitic transformation so that bainitic transformation starts all to reduce with final temperature；Mo can be in bayesian
Reallocate between body ferrite and carbide, make phase transition process slow down.
For controlling the mechanical property of high strength bainite steel, need to control the residual of the elements such as S, P:
S: sulfur is easily formed FeS and MnS in steel and is mingled with, and produces hot-short phenomenon, significantly reduces the toughness of steel, therefore, should use up
Amount reduces the sulfur content in steel；
P: phosphorus normal segregation in steel, in crystal boundary, is destroyed the seriality of matrix, is significantly reduced the toughness of steel, make welding performance become
Bad, it is easily generated cold short, therefore, the phosphorus content in steel should be reduced as far as possible.
Summary of the invention
It is an object of the invention to improve ultra-high strength bainite weldability, reduce cost of alloy and hot-working is prepared as
This, be beneficial to produce and application.
The middle carbon ultra-high strength bainite of the present invention, its chemical composition is C:0.28～0.5% by mass percentage,
Si:1.0～1.7%, Mn:1.8～3%, Cr:1.0～1.6%, Mo:0～0.3%, Co:0～0.5%, Al:0.6～
1.3%, P :≤0.015%, S :≤0.01%, N :≤0.01%, remaining is Fe and inevitable impurity.
The present invention specifically comprises the following steps that
1) smelt according to above-mentioned chemical composition, be then cast into blank；
2) after 1150～1200 DEG C of insulations, it is thermally processed into required size steel；
3) by steel after complete austenitizing heating and thermal insulation, be quickly cooled to isothermal treatment temperatures, 250～
270 DEG C and 280～300 DEG C of temperature ranges replace isothermal processes, alternate cycle 0.1～1 hour, process 3-24 hour then air
It is cooled to room temperature.
Beneficial effects of the present invention:
1) super-high strength steel that Mawella, U.K. Ministry of Defence etc. are described is compared, while ensureing superhigh intensity, larger amplitude
That spends improves elongation percentage and reduces carbon content, and the mass percent of carbon reduces about 0.2%～0.7% so that weldability
Being greatly improved with toughness, heat treatment time the most significantly shortens；
2) having the comprehensive mechanical property of excellence, tensile strength reaches 1500～1900MPa, and elongation percentage 12%～15%, U lacks
Mouth room temperature impact merit 53～90J；
3) considerably reducing noble alloy element in steel, its cost is only the 1/90 of Maraging steel；
4) the middle carbon bainite super-high strength steel of the present invention, can be used as high-strength mechanical component, as lightweight automotive sheet,
The products such as armour plate, bulletproof helmet and Micro Alloying axial workpiece.
Detailed description of the invention
The present invention uses compared steel 1 (patent CN 102112644A high-carbon steel), compared steel 2 (CN 103451549A high-carbon
Steel), steel as a comparison, its chemical composition is as shown in table 1.
The chemical composition (mass fraction, %) of table 1 steel
Steel billet is processed into after 1150～1200 DEG C of insulations by steel billet required size steel, and is heated to 850～1000
DEG C austenitizing, and replace isothermal processes, alternate cycle 0.1～1 at 250～270 DEG C and 280～300 DEG C of temperature ranges respectively
Hour, then air cooling is to room temperature.
Mechanical property corresponding to heterogeneity is as shown in table 2.
Table 2 mechanical property
Claims (1)
1. the preparation method of carbon ultra-high strength bainite in a kind, it is characterised in that the mass percent of each chemical composition is C:
0.28～0.5%, Si:1.0～1.7%, Mn:1.8～3%, Cr:1.0～1.6%, Mo:0～0.3%, Co:0～0.5%,
Al:0.6～1.3%, P :≤0.015%, S :≤0.01%, N :≤0.01%, remaining is Fe and inevitable impurity；
Preparation process is as follows: carry out smelting, casting according to described chemical composition；Gained steel billet after 1150～1200 DEG C of soaking,
Be machined to required size steel, then after complete austenitizing heating and thermal insulation, be quickly cooled to isothermal treatment temperatures, 250～
270 DEG C and 280～300 DEG C of temperature ranges replace isothermal processes, alternate cycle 0.1～1 hour, process 3-24 hour then air
It is cooled to room temperature；Structure of steel is the ferrite bainite of nanoscale width, tensile strength 1500～1900MPa, percentage elongation 12%～
15%, U-shaped breach room temperature impact merit is 53～90J.
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| CN104451408B true CN104451408B (en) | 2016-08-24 |
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| CN106917055B (en) * | 2017-03-17 | 2018-10-09 | 北京科技大学 | Tough automobile steel of a kind of third generation height and preparation method thereof |
| CN110129683B (en) * | 2019-05-16 | 2020-10-16 | 武汉科技大学 | Manufacturing method of high-strength bridge cable steel |
| CN110184537B (en) * | 2019-05-24 | 2020-10-30 | 武汉钢铁有限公司 | Low-carbon cobalt-containing high-strength bridge cable steel and production method thereof |
| CN110144521B (en) * | 2019-05-27 | 2021-01-08 | 武汉钢铁有限公司 | High-strength and high-toughness bridge cable steel and preparation method thereof |
| CN111286585B (en) * | 2020-03-19 | 2022-02-08 | 紫荆浆体管道工程股份公司 | Super bainite steel and preparation method thereof |
| CN113201690B (en) * | 2021-04-28 | 2022-01-28 | 潍坊科技学院 | Low-carbon nano bainite complex phase steel and preparation method thereof |
| CN114000053B (en) * | 2021-10-19 | 2022-05-20 | 湖南华菱涟钢特种新材料有限公司 | Hot-rolled steel sheet and method for producing same |
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| CN1477225A (en) * | 2003-08-01 | 2004-02-25 | 清华大学 | Medium carbon and medium-high carbon manganese system self-hardening bainite steel |
| CN103451549B (en) * | 2013-09-17 | 2016-05-25 | 北京科技大学 | A kind of 2100MPa nanometer bainitic steel and preparation method thereof |
| CN104017952B (en) * | 2014-05-28 | 2016-08-24 | 攀枝花贝氏体耐磨管道有限公司 | The economizing type of a kind of low-alloy high-strength steel part exempts to be tempered strength-toughening process |
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