CN105220078A - Low yield ratio weathering resistant steel and preparation method thereof - Google Patents
Low yield ratio weathering resistant steel and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to field of iron and steel smelting, be specifically related to a kind of low yield ratio weathering resistant steel and rolling method thereof.A kind of low yield ratio weathering resistant steel of the present invention, be made up of following weight percent chemical composition: C≤0.07%, Si≤0.50%, Mn≤1.5%, P≤0.02%, S≤0.010%, Cu? 0.20 ~ 0.55%, Cr? 3.00 ~ 3.70%, Ni? 0.10 ~ 0.65%, Ti0.01% ~ 0.03%, all the other are Fe and inevitable impurity.Weathering steel of the present invention and preparation method thereof, there is production cost low, technique is simple, conforming product rate is high, the features such as weathering steel excellent combination property, the high-weatherability requirement of existing industry to weathering steel can not only be met, the mechanical property requirements that steel are stable can also be met, especially there is superior plasticity and higher intensity.
Description
Technical field
The invention belongs to field of iron and steel smelting, be specifically related to a kind of low yield ratio weathering resistant steel and preparation method thereof.
Background technology
Weathering steel, also known as weather resisting steel, the corrosion under natural atmosphere condition can be resisted, the low alloy steel series between ordinary steel and stainless steel, weathering steel is added the corrosion-resistant elements such as a small amount of copper, nickel and forms by straight carbon steel, have high-quality steel tough, mould prolong, shaping, welding, abrasion, high temperature, the characteristic such as antifatigue; Weathering resistance is 2 ~ 8 times of straight carbon steel, and coating is 1.5 ~ 10 times of straight carbon steel.Meanwhile, it has antirust, component is anticorrosively lengthened the life, thinning consumption reduction, the features such as saving of labor is energy-conservation.Weathering steel is mainly used in railway, vehicle, bridge, pylon etc. and is chronically exposed to the steel construction used in air.For the manufacture of the structural part such as container of sulfide hydrogen corrosive medium in freight container, rail truck, oil derrick, harbour building, production vessel and chemical petroleum equipment.
In prior art, weathering steel adopts elements such as adding molybdenum, niobium, titanium, zirconium and vanadium mostly; to make it form protective layer on the surface, improve the weather resistance of steel, these elements are mostly expensive; preparation cost is relatively high; in addition, although rare earth element has extremely strong deoxidizing capacity, and can crystal grain thinning; change the form of inclusion; but the fusing point of its oxide compound is higher, than great, easily cause clogging of tundish nozzle when continuous casting.
Application number is " 201210130225.X ", and denomination of invention is " a kind of weathering steel ", and the material disclosing a kind of following weight percent is formed: manganese 0.36 ~ 0.50%; Chromium 0.45 ~ 0.60%; Nickel 0.11 ~ 0.13%; Copper 0.25 ~ 0.32%; Nitrogen≤0.005%; Phosphorus 0.070 ~ 0.105%; Surplus is the weathering steel of iron and inevitable impurity.Wherein, in this patent weathering steel, chromium content is lower, and phosphorus content is higher, easily causes the fragility of steel, and the steel of preparation can not meet existing industry to new demands such as weathering steel high anti-corrosion, obdurabilities.
High-strength and high-weather-resistance steel is compared with common weathering steel, and corrosion resisting property improves about one times, improves the work-ing life of rail truck, and simultaneously because alloy content is high, yield tensile ratio is higher.Yield strength and the unit elongation of weathering steel are inversely proportional to, and namely along with the increase of yield strength, the unit elongation of steel reduces, yield tensile ratio is low, and the plasticity of steel increases, and can allow some leeway architectural for the tensile strength of steel, the application of the material that plasticity of satisfying the demand is good, such as boilers and pressure vessel etc.
The practice of lot of experiments Research And Engineering shows, yield tensile ratio is the mechanical parameter that overall uniform plastic deformation ability occurs because of overload exosyndrome material, and the work hardening capacity of itself and material is closely related.Lower yield tensile ratio, means higher work hardening exponent, and the yield tensile ratio of steel is the important mechanical performance index of of relational structure security.
Summary of the invention
In order to overcome the deficiencies in the prior art, it is good that first technical problem to be solved by this invention is to provide a kind of plasticity, the low yield ratio weathering resistant steel that intensity is high.
Low yield ratio weathering resistant steel of the present invention, be made up of following weight percent chemical composition: C≤0.07%, Si≤0.50%, Mn≤1.5%, P≤0.02%, S≤0.010%, Cu0.20 ~ 0.55%, Cr3.00 ~ 3.70%, Ni0.10 ~ 0.65%, Ti0.01% ~ 0.03%, all the other are Fe and inevitable impurity.
Further, as preferred technical scheme, low yield ratio weathering resistant steel described above, be made up of following weight percent chemical composition: C0.03 ~ 0.07%, Si0.1 ~ 0.5%, Mn0.5 ~ 1.5%, P≤0.02%, S≤0.010%, Cu0.20 ~ 0.55%, Cr3.00 ~ 3.70%, Ni0.10 ~ 0.65%, Ti0.01% ~ 0.03%, all the other are Fe and inevitable impurity.
Further, as preferred technical scheme, low yield ratio weathering resistant steel described above, be made up of following weight percent chemical composition: C0.031 ~ 0.050%, Si0.10 ~ 0.50%, Mn0.51 ~ 1.0%, P0.010 ~ 0.020%, S0.005 ~ 0.010%, Cu0.20 ~ 0.39%, Cr3.00 ~ 3.69%, Ni0.10 ~ 0.21%, Ti0.01 ~ 0.03%, all the other are Fe and inevitable impurity.
Further, as preferred technical scheme, low yield ratio weathering resistant steel described above, be made up of following weight percent chemical composition: C0.04%, Si0.30%, Mn0.75%, P0.015%, S0.007%, Cu0.30%, Cr3.35%, Ni0.15%, Ti0.02%, all the other are Fe and inevitable impurity.
Low yield ratio weathering resistant steel described above, its yield strength 500 ~ 550MPa, tensile strength 700 ~ 750MPa, yield tensile ratio≤0.75, unit elongation >=25%, low-temperature impact work 150 ~ 199J at-40 DEG C, relative corrosion rate≤30%.
It is simple that second technical problem to be solved by this invention is to provide a kind of method, and cost is low, the preparation method of the low yield ratio weathering resistant steel of yield tensile ratio≤0.75.
The preparation method of low yield ratio weathering resistant steel described above, the method mainly comprises the following steps: steel billet → hot rolling → section cooling → batch;
Wherein, the start rolling temperature of finish rolling in hot-rolled step is 950 ~ 995 DEG C, and in hot-rolled step, finishing temperature is 830 ~ 855 DEG C, and in hot-rolled step, roll speed is 2 ~ 10m/s; In cooling step, upper header water yield ratio is 45 ~ 55%, and lower collector pipe water yield ratio is 55 ~ 65%, and the average rate of cooling of cooling step light plate is 5 ~ 20 DEG C/s; Coiling temperature is 560 ~ 596 DEG C.
Further, as preferred technical scheme, the preparation method of low yield ratio weathering resistant steel described above, the start rolling temperature of finish rolling in hot-rolled step is 975 DEG C, and in hot-rolled step, finishing temperature is 845 DEG C, and in hot-rolled step, roll speed is 6.2m/s; In cooling step, upper header water yield ratio is 50%, and lower collector pipe water yield ratio is 60%, and the average rate of cooling of cooling step light plate is 12.5 DEG C/s; Coiling temperature is 580 DEG C.
The preparation method of low yield ratio weathering resistant steel of the present invention and the low yield ratio weathering resistant steel of preparation thereof, there is production cost low, technique is simple, the features such as conforming product rate is high, weathering steel excellent combination property, can not only meet the high-weatherability requirement of existing industry to weathering steel, the mechanical property requirements of steel high strength can also be met, by controlled rolling and process for cooling, have that yield tensile ratio is low, rolling accepted product percentage is high, the advantages such as product high comprehensive performance.
Accompanying drawing explanation
Fig. 1 is the high chromium weathering steel CCT curve figure prepared by the present invention;
Fig. 2 is a kind of low yield strength ratio high-strength and high-weather-resistance of the present invention steel typical organization (about amplifying 500 times).
Embodiment
Low yield ratio weathering resistant steel of the present invention, be made up of following weight percent chemical composition: C≤0.07%, Si≤0.50%, Mn≤1.5%, P≤0.02%, S≤0.010%, Cu0.20 ~ 0.55%, Cr3.00 ~ 3.70%, Ni0.10 ~ 0.65%, Ti0.01% ~ 0.03%, all the other are Fe and inevitable impurity.
Further, as preferred technical scheme, low yield ratio weathering resistant steel described above, be made up of following weight percent chemical composition: C0.03 ~ 0.07%, Si0.1 ~ 0.5%, Mn0.5 ~ 1.5%, P≤0.02%, S≤0.010%, Cu0.20 ~ 0.55%, Cr3.00 ~ 3.70%, Ni0.10 ~ 0.65%, Ti0.01% ~ 0.03%, all the other are Fe and inevitable impurity.
Further, as preferred technical scheme, low yield ratio weathering resistant steel described above, be made up of following weight percent chemical composition: C0.031 ~ 0.050%, Si0.10 ~ 0.50%, Mn0.51 ~ 1.0%, P0.010 ~ 0.020%, S0.005 ~ 0.010%, Cu0.20 ~ 0.39%, Cr3.00 ~ 3.69%, Ni0.10 ~ 0.21%, Ti0.01 ~ 0.03%, all the other are Fe and inevitable impurity.
Further, as preferred technical scheme, low yield ratio weathering resistant steel described above, be made up of following weight percent chemical composition: C0.04%, Si0.30%, Mn0.75%, P0.015%, S0.007%, Cu0.30%, Cr3.35%, Ni0.15%, Ti0.02%, all the other are Fe and inevitable impurity.
Low yield ratio weathering resistant steel described above, its yield strength 500 ~ 550MPa, tensile strength 700 ~ 750MPa, yield tensile ratio≤0.75, unit elongation >=25%, low-temperature impact work 150 ~ 199J at-40 DEG C, relative corrosion rate≤30%.
The preparation method of low yield ratio weathering resistant steel described above, the method mainly comprises the following steps: steel billet → hot rolling → section cooling → batch;
Wherein, the start rolling temperature of finish rolling in hot-rolled step is 950 ~ 995 DEG C, and in hot-rolled step, finishing temperature is 830 ~ 855 DEG C, and in hot-rolled step, roll speed is 2 ~ 10m/s; In cooling step, upper header water yield ratio is 45 ~ 55%, and lower collector pipe water yield ratio is 55 ~ 65%, and the average rate of cooling of cooling step light plate is 5 ~ 20 DEG C/s; Coiling temperature is 560 ~ 596 DEG C.
Further, as preferred technical scheme, the preparation method of low yield ratio weathering resistant steel described above, the start rolling temperature of finish rolling in hot-rolled step is 975 DEG C, and in hot-rolled step, finishing temperature is 845 DEG C, and in hot-rolled step, roll speed is 6.2m/s; In cooling step, upper header water yield ratio is 50%, and lower collector pipe water yield ratio is 60%, and the average rate of cooling of cooling step light plate is 12.5 DEG C/s; Coiling temperature is 580 DEG C.
Wherein, in described hot-rolled step, finish rolling start rolling temperature is 950 ~ 995 DEG C, and temperature is too low, and rolling rhythm is too slow, and production efficiency is low.Temperature is too high, comparatively large with the temperature difference of finishing temperature, and cause operation of rolling roll speed and speed of cooling too fast, uneven microstructure, causes finished product over-all properties poor.
In described hot-rolled step, finishing temperature is 830 ~ 855 DEG C, and temperature is too low, larger with the temperature difference of start rolling temperature.Temperature is too high, comparatively large with the temperature difference of coiling temperature, causes section cooling speed too fast, uneven microstructure, and can not get desired tissue.
In described hot-rolled step, roll speed is 2 ~ 10m/s, and roll speed is too low, and steel plate temperature drop is large, can not ensure finishing temperature.Roll speed is too high, causes rate of cooling excessive, easily produces bainite structure.
In described cooling step, laminar flow cooling upper header water yield ratio is 45 ~ 55%, and lower collector pipe water yield ratio is 55 ~ 65%, and collector water yield ratio is too low, can not meet coiling temperature requirement.Collector water yield ratio is too high, mates difficulty with roll speed and coiling temperature.
The average rate of cooling of described cooling step light plate is 5 ~ 20 DEG C/s, and average cooling rate is too low, is organized as austenite+ferrite, and yield tensile ratio can not meet the demands.Average cooling rate is too high, is organized as austenite+bainite, and yield tensile ratio can not meet the demands, and unit elongation is low, and low temperature impact properties is poor.
Described temperature of batching in step is 560 ~ 596 DEG C, and temperature is too low or too high all can cause rate of cooling and roll speed coupling difficulty.
In general, alloy content is higher, armor plate strength is higher, yield tensile ratio is higher, in alloy content and intensity with under the prerequisite of limit, yield tensile ratio can be reduced by the organizational composition suitably controlled in steel, technical measures of the present invention is exactly to obtain appropriate martensitic stucture, thus reaches the object reducing yield tensile ratio, and martensite too many and very little all can affect the mechanical properties and weather resistance.
Accompanying drawing 1 is the CCT curve that the present invention prepares low yield strength ratio high-strength weathering steel, i.e. supercooled austenite continuous cooling transformation curve, as can be seen from the figure: 1. under any speed of cooling, all have austenitic formation, martensitic stucture is transformed in the process of cooling of these austenites easily after batching; 2., when speed of cooling is at 0.06 DEG C/s ~ 5 DEG C/s, austenite+ferrite is organized as; 3., when speed of cooling is at 0.2 DEG C/s ~ 40 DEG C/s, austenite+bainite is organized as; 4., when speed of cooling is at 10 DEG C/more than s, austenite+martensite is organized as.Therefore, should batch in the temperature higher than Bainite Phases of Some height, to avoid bainite structure to occur, make residual austenite finally change martensitic stucture into.
Accompanying drawing 2 is metaloscope photos of a kind of low yield strength ratio high-strength and high-weather-resistance of the present invention steel, is the heterogeneous microstructure figure of steel, about amplifies 500 times.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
The chemical component weight per-cent of steel billet is: C:0.04%, Si:0.30%, Mn:0.75%%, P:0.015%, S:0.007%, Cr:3.35%, Ni:0.15%, Cu:0.30%, Ti:0.02%, and all the other are Fe and inevitable impurity.
In hot-rolled step, finish rolling start rolling temperature is 975 DEG C, and in hot-rolled step, finishing temperature is 845 DEG C; In hot-rolled step, roll speed is 6.2m/s; In cooling step, laminar flow cooling upper header water yield ratio is 50%, and lower collector pipe water yield ratio is 60%; The average rate of cooling of cooling step light plate is 12.5 DEG C/s; The temperature of batching in step is 580 DEG C.
The low yield ratio weathering resistant steel mechanical property Rel:523MPa that present method is produced, Rm:715MPa, yield tensile ratio 0.73, A%:27%; Low temperature impact properties (-40 DEG C): 185J, weather resistance (relative corrosion rate): 28%.
Embodiment 2
The chemical component weight per-cent of steel billet is: C:0.031%, Si:0.11%, Mn:0.52%%, P:0.012%, S:0.006%, Cr:3.05%, Ni:0.12%, Cu:0.21%, Ti:0.011%, and all the other are Fe and inevitable impurity.
In hot-rolled step, finish rolling start rolling temperature is 952 DEG C, and in hot-rolled step, finishing temperature is 831 DEG C; In hot-rolled step, roll speed is 2.1m/s; In cooling step, laminar flow cooling upper header water yield ratio is 45%, and lower collector pipe water yield ratio is 55%; The average rate of cooling of cooling step light plate is 5.2 DEG C/s; The temperature of batching in step is 563 DEG C.
The low yield ratio weathering resistant steel mechanical property Rel:505MPa that present method is produced, Rm:708MPa, yield tensile ratio 0.71, A%:27%; Low temperature impact properties (-40 DEG C): 196J, weather resistance (relative corrosion rate): 29.3%.
Embodiment 3
The chemical component weight per-cent of steel billet is: C:0.048%, Si:0.47%, Mn:0.95%, P:0.018%, S:0.009%, Cr:3.65%, Ni:0.20%, Cu:0.38%, Ti:0.025%, and all the other are Fe and inevitable impurity.
In hot-rolled step, finish rolling start rolling temperature is 994 DEG C, and in hot-rolled step, finishing temperature is 855 DEG C; In hot-rolled step, roll speed is 9.8m/s; In cooling step, laminar flow cooling upper header water yield ratio is 55%, and lower collector pipe water yield ratio is 65%; The average rate of cooling of cooling step light plate is 18.5 DEG C/s; The temperature of batching in step is 596 DEG C.
The low yield ratio weathering resistant steel mechanical property Rel:546MPa that present method is produced, Rm:735MPa, yield tensile ratio 0.74, A%:25.5%; Low temperature impact properties (-40 DEG C): 162J, weather resistance (relative corrosion rate): 26.5%.
Claims (7)
1. low yield ratio weathering resistant steel, it is characterized in that: be made up of following weight percent chemical composition: C≤0.07%, Si≤0.50%, Mn≤1.5%, P≤0.02%, S≤0.010%, Cu0.20 ~ 0.55%, Cr3.00 ~ 3.70%, Ni0.10 ~ 0.65%, Ti0.01% ~ 0.03%, all the other are Fe and inevitable impurity.
2. low yield ratio weathering resistant steel according to claim 1, it is characterized in that: be made up of following weight percent chemical composition: C0.03 ~ 0.07%, Si0.1 ~ 0.5%, Mn0.5 ~ 1.5%, P≤0.02%, S≤0.010%, Cu0.20 ~ 0.55%, Cr3.00 ~ 3.70%, Ni0.10 ~ 0.65%, Ti0.01% ~ 0.03%, all the other are Fe and inevitable impurity.
3. low yield ratio weathering resistant steel according to claim 2, it is characterized in that: be made up of following weight percent chemical composition: C0.031 ~ 0.050%, Si0.10 ~ 0.50%, Mn0.51 ~ 1.0%, P0.010 ~ 0.020%, S0.005 ~ 0.010%, Cu0.20 ~ 0.39%, Cr3.00 ~ 3.69%, Ni0.10 ~ 0.21%, Ti0.01 ~ 0.03%, all the other are Fe and inevitable impurity.
4. low yield ratio weathering resistant steel according to claim 3, it is characterized in that: be made up of following weight percent chemical composition: C0.04%, Si0.30%, Mn0.75%, P0.015%, S0.007%, Cu0.30%, Cr3.35%, Ni0.15%, Ti0.02%, all the other are Fe and inevitable impurity.
5. low yield ratio weathering resistant steel according to any one of Claims 1 to 4, it is characterized in that: the yield strength 500 ~ 550MPa of low yield ratio weathering resistant steel, tensile strength 700 ~ 750MPa, yield tensile ratio≤0.75, unit elongation >=25%, low-temperature impact work 150 ~ 199J at-40 DEG C, relative corrosion rate≤30%.
6. the preparation method of low yield ratio weathering resistant steel described in any one of Claims 1 to 5, the method mainly comprises the following steps: steel billet → hot rolling → section cooling → batch, it is characterized in that: the start rolling temperature of finish rolling in hot-rolled step is 950 ~ 995 DEG C, in hot-rolled step, finishing temperature is 830 ~ 855 DEG C, and in hot-rolled step, roll speed is 2 ~ 10m/s; In cooling step, upper header water yield ratio is 45 ~ 55%, and lower collector pipe water yield ratio is 55 ~ 65%, and the average rate of cooling of cooling step light plate is 5 ~ 20 DEG C/s; Coiling temperature is 560 ~ 596 DEG C.
7. the preparation method of low yield ratio weathering resistant steel according to claim 6, it is characterized in that: the start rolling temperature of finish rolling in hot-rolled step is 975 DEG C, and in hot-rolled step, finishing temperature is 845 DEG C, in hot-rolled step, roll speed is 6.2m/s; In cooling step, upper header water yield ratio is 50%, and lower collector pipe water yield ratio is 60%, and the average rate of cooling of cooling step light plate is 12.5 DEG C/s; Coiling temperature is 580 DEG C.
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Cited By (7)
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| CN111850409A (en) * | 2020-07-30 | 2020-10-30 | 攀钢集团研究院有限公司 | 540 MPa-grade high-silicon high-chromium weathering steel and preparation method thereof |
| CN111945065A (en) * | 2020-08-03 | 2020-11-17 | 攀钢集团研究院有限公司 | 500 MPa-grade high-chromium weathering steel and preparation method and application thereof |
| CN111961971A (en) * | 2020-08-03 | 2020-11-20 | 攀钢集团研究院有限公司 | 500MPa grade high-phosphorus high-chromium weathering steel and preparation method and application thereof |
| CN111961970A (en) * | 2020-08-03 | 2020-11-20 | 攀钢集团研究院有限公司 | 530 MPa-grade high-phosphorus high-chromium weathering steel and preparation method and application thereof |
| CN111996451A (en) * | 2020-08-03 | 2020-11-27 | 攀钢集团研究院有限公司 | 460 MPa-grade high-chromium weathering steel and preparation method and application thereof |
| CN115094339A (en) * | 2022-07-27 | 2022-09-23 | 马鞍山钢铁股份有限公司 | Hot-rolled dual-phase high-corrosion-resistance steel plate with tensile strength of 900MPa and manufacturing method thereof |
| CN115418553A (en) * | 2022-09-16 | 2022-12-02 | 武汉钢铁有限公司 | High-corrosion-resistance weathering steel and preparation method thereof |
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| CN111996451A (en) * | 2020-08-03 | 2020-11-27 | 攀钢集团研究院有限公司 | 460 MPa-grade high-chromium weathering steel and preparation method and application thereof |
| CN115094339A (en) * | 2022-07-27 | 2022-09-23 | 马鞍山钢铁股份有限公司 | Hot-rolled dual-phase high-corrosion-resistance steel plate with tensile strength of 900MPa and manufacturing method thereof |
| CN115094339B (en) * | 2022-07-27 | 2023-09-08 | 马鞍山钢铁股份有限公司 | Hot-rolled dual-phase high corrosion-resistant steel plate with tensile strength of 900MPa and manufacturing method thereof |
| CN115418553A (en) * | 2022-09-16 | 2022-12-02 | 武汉钢铁有限公司 | High-corrosion-resistance weathering steel and preparation method thereof |
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