High-strength hot-rolled steel sheet and method for manufacturing same
A technology for a hot-rolled steel sheet and a manufacturing method, which is applied in the field of high-strength hot-rolled steel sheet and its manufacturing, can solve the problems of deterioration of material properties such as stretch flanging formability, bending formability, low temperature toughness, etc., and achieves bending formability Excellent effect, reduced environmental load, excellent low temperature toughness
Active Publication Date: 2021-03-19
JFE STEEL CORP
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Problems solved by technology
[0004] However, with the increase in the strength of steel sheets, material properties such as stretch flanging formability, bending formability, and low-temperature toughness generally deteriorate.
Method used
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[0151] Molten steel having the composition shown in Table 1 was melted in a converter, and a steel slab (steel slab) was produced by a continuous casting method. Next, these steel slabs were heated under the manufacturing conditions shown in Table 2-1 and Table 2-2, rough rolling was applied, and descaling of the steel plate surface was applied under the conditions shown in Table 2-1 and Table 2-2. , applying finish rolling under the conditions shown in Table 2-1 and Table 2-2. After finishing rolling, the cooling start time (time from finishing rolling to start cooling (forced cooling)) and average cooling rate (from finishing rolling) to the conditions shown in Table 2-1 and Table 2-2 The average cooling rate from the temperature to the coiling temperature) and the cooling stop temperature, the steel plate is cooled and coiled until the average cooling rate shown in Table 2-1 and Table 2-2 is below 100°C, and the coiled steel plate After cooling, hot-rolled steel sheets wit...
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Abstract
Provided are: a high-strength hot-rolled steel sheet which, while maintaining high strength including a tensile strength TS of 1180 MPa or greater, furthermore has excellent stretch-flange formability, bending formability, and low-temperature toughness; and a method for manufacturing the same. A high-strength hot-rolled steel sheet having: a specific component composition; and a steel structure having a lower bainite phase and / or a tempered martensite phase in a total area ratio of 90% or greater as a main phase, the average grain size of the main phase being 10.0 um or less, and the amount ofFe in Fe-based precipitates being 0.70% or less in terms of % by mass; the arithmetic mean roughness (Ra) of the surface of the high-strength hot-rolled steel sheet being 2.50 um or less, and the tensile strength TS thereof being 1180 MPa or greater.
Description
technical field [0001] The present invention relates to a high-strength hot-rolled steel plate and a manufacturing method thereof. And excellent low temperature toughness, tensile strength TS is 1180MPa or more. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, regulations on automobile exhaust have been strengthened. Therefore, improving the fuel efficiency of automobiles has become an important issue. Furthermore, the materials used are required to be further strengthened and thinned. Along with this, high-strength hot-rolled steel sheets are being actively used as raw materials for automobile parts. This high-strength hot-rolled steel sheet is used not only for structural members and framework members of automobiles, but also for chassis members, track frame members, members for construction machinery, and the like. [0003] As described above, the demand for high-strength hot-rolled steel sheets having a specified...
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IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60
CPCC22C38/00C22C38/14C21D9/46C22C38/60C22C38/02C22C38/04C22C38/06C22C38/28C22C38/50C21D8/0226C21D8/0426C22C38/18C22C38/22C22C38/20C22C38/24C22C38/26C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C21D2211/002C21D2211/008C23C2/40C22C38/12C22C38/001C22C38/002C22C38/38C22C38/34C22C38/32C22C38/08C22C38/005C21D1/18C21D1/02C21D8/0278C21D8/0478C21D9/48C22C38/58C21D6/001C21D6/002C21D6/005C21D6/008C21D8/005C21D8/0263C22C38/16
Inventor 山崎和彦横田毅海宝寿实雄森安永明
Owner JFE STEEL CORP