Steel plate and manufacturing method thereof
A manufacturing method and technology for steel plates, applied in manufacturing tools, chemical instruments and methods, metal material coating processes, etc., can solve problems such as delayed failure and deterioration of delayed failure resistance, and achieve improved component strength and excellent delayed failure resistance. , the effect of cost reduction
Active Publication Date: 2021-01-26
JFE STEEL CORP
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Problems solved by technology
[0004] However, when a high-strength steel plate of TS: 1320 MPa or higher is formed by cold pressing to form a part, due to the increase of residual stress in the part and the deterioration of the delayed fracture resistance caused by the steel plate itself, it may occur delayed destruction
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[0209] After the steels of the steel numbers A to W shown in Table 1 were melted, they were cast into slabs with a thickness of 130 to 230 mm. For the cast slab, under the conditions shown in Table 2 (Table 2-1 and Table 2-2 are combined into Table 2) (slab heating temperature (SRT), time when the slab surface temperature is 1220°C or higher (average hot-rolling time), finish rolling temperature (FT)), implement hot rolling, and then cool at an average cooling rate (cooling rate): 30-200°C / s, at the coiling temperature shown in Table 2 ( CT) conditions for winding. The obtained hot-rolled steel sheets were pickled, and cold-rolled at the rolling ratios shown in Table 2 to produce cold-rolled steel sheets with thicknesses shown in Table 2. It should be noted that "[%Ti]×[%Nb] in Table 1 2 "The unit is (mass%) 3 .
[0210] The obtained cold-rolled steel sheet was annealed in a continuous annealing line under the conditions shown in Table 2 (annealing temperature (AT), soakin...
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Abstract
The present invention provides a steel plate having a thickness of 0.5 to 2.6 mm and a high tensile strength (TS) of 1320 MPa or more, and delayed failure resistance, especially a shear end face, and an advantageous manufacturing method thereof. Excellent resistance to delayed failure. A steel plate having a specific chemical composition and the following steel structure. In the steel structure, the total area ratio of martensite and bainite to the entire structure is greater than 90% and 100% or less, and inclusion cluster A that satisfies the specified condition 2pcs / mm 2 Inclusion clusters B that exist in the following manner and meet specific conditions are counted at 5 / mm 2 The following form exists, and the aspect ratio is 2.0 or less, and the major axis is 0.30 μm to 2 μm, and the carbide mainly composed of Fe is 4000 pieces / mm 2 The following forms exist, and the average primary γ particle size is 6 to 15 μm.
Description
technical field [0001] The present invention relates to a steel plate and a manufacturing method thereof. In particular, it relates to a steel sheet suitable for production of components such as automobiles and home appliances formed by cold pressing. Background technique [0002] In recent years, due to the further increase in the demand for lightweight automobile bodies, TS: 1320~1470MPa high-strength steel plates are used in car body skeleton parts such as center pillar R / F (reinforcement parts), bumpers, and anti-collision beam parts. etc. (hereinafter, also referred to as "parts") are constantly evolving. In addition, from the viewpoint of further reducing the weight of automobile bodies, the application of steel sheets having a strength of TS: 1800 MPa class (1.8 GPa class) or higher has been studied. [0003] In the past, research on the application of high-strength steel sheets by hot press forming at high temperature has been vigorously promoted, but recently, fro...
Claims
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IPC IPC(8): C22C38/00C21D9/46C21D9/52C22C38/14C22C38/60
CPCB32B15/013C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/021C21D8/0236C21D8/0247C21D8/0405C21D8/041C21D8/0426C21D8/0436C21D8/0473C21D9/46C21D2211/002C21D2211/008C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C22C38/60C21D9/52B32B15/01B32B15/04B32B15/043B32B15/18C22C38/18C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/40C23C2/06C23C2/40C23C28/025C23C28/3225C23C30/00C23C30/005Y10T428/12757Y10T428/12799Y10T428/12951Y10T428/12972
Inventor 小野义彦吉冈真平中村展之长谷川宽
Owner JFE STEEL CORP