Long-fatigue-life strip steel as well as preparation method and application thereof
A technology for fatigue life and strip steel, applied in the field of high fatigue life strip steel and its preparation, which can solve the problems of decarburization, reducing the fatigue performance of products, and restricting the use of products.
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[0043]According to another typical embodiment of the present invention, there is also provided a method for preparing high fatigue life steel strip, the method comprising:
[0044]Obtaining the cast billet of the high fatigue life steel strip;
[0045]Heating the cast slab before rolling, hot rolling, cooling and coiling after rolling to obtain hot rolled coils;
[0046]In the pre-rolling heating, the furnace temperature is 1180-1260°C, and the furnace time is ≥180min,
[0047]Hot rolling includes rough rolling and finishing rolling. The finishing temperature of the rough rolling is 1020~1100℃, and the finishing temperature of the finishing rolling is 840~880℃.
[0048]In the post-rolling cooling, the front-stage intensive cooling is adopted to 580-640°C.
[0049]During the heating before rolling, the furnace temperature is controlled to be 1180-1260°C, and the reason for the furnace time ≥180min is to fully melt the alloy elements. If the furnace temperature is too low or the furnace time is too sho...
Example Embodiment
[0054]Example 1
[0055]The high fatigue life steel strip provided in this embodiment is composed of chemical components with the following mass fractions:
[0056]C 0.28%, Si 0.15%, Mn 1.3%, P 0.014%, S 0.002%, Al 0.04%, Ti 0.02%, B 0.0030%, Cr 0.25%, N 0.004%, Sb: 0.08%, Sn: 0.1% , The rest is Fe and unavoidable impurities.
[0057]This embodiment also provides a method for preparing the above-mentioned high fatigue life steel strip, including:
[0058]Obtaining the cast billet of the high fatigue life steel strip;
[0059]Heating the cast slab before rolling, hot rolling, cooling and coiling after rolling to obtain hot rolled coils;
[0060]During pre-rolling heating, the discharge temperature is 1240℃, the furnace time is 220min, the length, width and height of the slab are controlled to be 8.5m, 1m and 230mm respectively, and the temperature difference of the section of the slab is 12℃;
[0061]Hot rolling includes rough rolling and finishing rolling. In rough rolling, 1+5 rolling mode is adopted, ...
Example Embodiment
[0064]Example 2
[0065]The high fatigue life steel strip provided in this embodiment is composed of chemical components with the following mass fractions:
[0066]C 0.36%, Si 0.18%, Mn 1.2%, P 0.013%, S 0.002%, Al 0.05%, Ti 0.03%, B 0.0025%, Cr 0.2%, N 0.003%, Sb: 0.15%, the rest is Fe and Inevitable impurities.
[0067]This embodiment also provides a method for preparing the above-mentioned high fatigue life steel strip, including:
[0068]Obtaining the cast billet of the high fatigue life steel strip;
[0069]Heating the cast slab before rolling, hot rolling, cooling and coiling after rolling to obtain hot rolled coils;
[0070]During pre-rolling heating, the discharge temperature is 1220℃, the furnace time is 230min, the length, width and height of the slab are controlled to be 9m, 900mm and 230m, respectively, and the temperature difference of the section of the slab is 15℃;
[0071]Hot rolling includes rough rolling and finishing rolling. In rough rolling, 1+5 rolling mode is adopted, that is, the...
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