Hot-dip galvanized steel sheet and manufacturing method thereof
A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in hot-dip galvanizing process, manufacturing tools, heat treatment furnace, etc., can solve the problem that the punchability cannot be improved, and achieve excellent punchability, high-strength punchability, The effect of excellent punchability
Active Publication Date: 2022-03-01
JFE STEEL CORP
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Problems solved by technology
In addition, in the technology described in Patent Document 3, there is a problem that the punchability cannot be improved when the strength is greatly increased by precipitation strengthening.
Method used
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[0110] Examples of the present invention will be described.
[0111] Steel with the composition shown in Table 1 was continuously cast to form a slab, and after being heated to 1250° C., rough rolling was carried out, and then, under the conditions shown in Table 2, finish rolling was carried out (7 stands Rack), cooling, coiling, as a hot-rolled coil, after pickling, annealing, dipping in a galvanizing bath at 470°C for plating, and obtaining hot-dip galvanized steel sheets of test specimens No. 1 to 30 . Furthermore, some of the above-mentioned test pieces were subjected to the reheating treatment shown in Table 2 after plating to obtain the thickness reduction rate. In addition, in Table 2, "-" in the column of reheating temperature, retention time, and thickness reduction rate shows that this process was not performed.
[0112] [Table 1]
[0113]
[0114] Underlined means outside the scope of the invention
[0115]
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Abstract
The present invention provides a hot-dip galvanized steel sheet that is more excellent in punchability. This hot-dip galvanized steel sheet has the following composition and structure, and the composition contains C: 0.08-0.20%, Si: 0.5% or less, Mn: 0.8-1.8%, P: 0.10% or less, S: 0.030% by mass % % or less, Al: 0.10% or less, N: 0.010% or less, further containing one or more of Ti: 0.01-0.3%, Nb: 0.01-0.1%, V: 0.01-1.0% (Ti / 48 +Nb / 93+V / 51)×12≥0.07, the remainder is composed of Fe and unavoidable impurities, and in the structure, the total of the ferrite phase and the tempered bainite phase is 95% by area ratio In addition, the average particle size of the structure is 5.0 μm or less, and the amount of precipitated Fe is 0.10% by mass or more, and the amount of Ti, Nb, and V precipitated in the form of precipitates with a particle size of less than 20 nm is calculated by the equivalent amount of precipitated C It is 0.025% by mass or more, and more than half of the precipitates with a particle diameter of less than 20 nm are randomly precipitated.
Description
technical field [0001] The invention relates to a hot-dip galvanized steel sheet and a manufacturing method thereof. In particular, the present invention relates to vehicles suitable for running parts such as undercarriages and frames, skeleton parts such as pillars and beams and their reinforcing parts, side door anti-collision beams, vending machines, stands, home appliances, office equipment, building materials, etc. A high-strength hot-dip galvanized steel sheet excellent in punchability for structural members to be used, and a method for producing the same. Background technique [0002] In recent years, with increasing concern for the global environment, it is desired to reduce CO at the time of manufacturing 2 There is an increasing demand for the use of steel sheets with large emissions. Furthermore, in the field of automobiles and the like, there is an increasing demand for reducing exhaust gas while improving fuel efficiency by reducing the body of the vehicle. T...
Claims
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IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60C23C2/06C23C2/28C23C2/40
CPCC21D9/46C22C38/00C22C38/14C22C38/60C23C2/06C23C2/28C23C2/40C21D2211/005C21D2211/002C21D8/0263C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/18C22C38/26C23C2/29Y10T428/12799
Inventor 木津太郎森安永明锅岛茂之田原和宪佐佐木香菜
Owner JFE STEEL CORP