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Steel sheet

A steel plate and plate thickness technology, applied in the field of steel plates, can solve problems such as cracks in solder joints, decreased strength of welded joints, and development

Active Publication Date: 2021-08-13
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the welding of steel plates, for example, as described in the following Patent Document 1, a decrease in the strength of the welded joint may become a problem.
It is considered that when the toughness of the solder joint formed during welding is low, cracks will develop and develop in the solder joint, and the strength of the welded joint will decrease

Method used

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Embodiment

[0104] In the process of manufacturing a continuous casting slab having a thick cast slab having a thickness of 250 mm shown in Table 1, a wire-shaped iron oxide is added in accordance with the conditions shown in Tables 2-1 to 2-3 to obtain partial cloth in the surface layer. A slab with Al oxide. Tables 4-1 to 4-3 are shown: as the "position of the surface layer", is a wire-shaped iron oxide addition of wire-shaped iron oxide in the single surface portion to add a wire-shaped iron oxide. The slab is supplied to heat rolled under the conditions of the heating temperature, fine rolling temperature, and the winding temperature of the winding temperature, to obtain a hot rolled steel sheet. For steel sheets to be made into cold rolled steel sheets, after the hot rolled steel sheet is obtained as described above, the acid washing, the pressure reduction rate is 50% cold rolled, under the conditions shown in Tables 2-1 ~ 2-3. Annealing. Further, a portion of the steel sheet is carried...

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Abstract

This invention pertains to a steel sheet that combines moldability and weldability. This steel sheet is characterized by, in the surface layer portion which is the region up until a depth of 30 mum in the thickness direction from the surface of the steel sheet, aluminum oxide particles being present at a density of 3000-6000 particles / mm<2>, the natural logarithm of the particle diameter of aluminum oxide particles measured in mum units having an average of -5.0 to -3.5, a standard deviation not exceeding 0.8, the number of aluminum oxide particles having a deviation from the average of the natural logarithm of the particle diameter being greater than double the standard deviation not exceeding 5% of the total number of aluminum oxide particles, and at a depth of 1 / 2 the thickness of the steel sheet, the density of aluminum oxide particles does not exceed 1000 particles / mm<2>.

Description

Technical field [0001] The present invention relates to a steel sheet. Background technique [0002] In recent years, from the viewpoint of improvement of automotive fuel efficiency related to environmental protection, it is required to make the car steel plate high strength, thinner, so that the car is lightly quantified. In addition, the steel sheet used by the automotive component is required to have excellent moldability due to the shape of which is molded into various shapes. Further, since the molded member is to be welded in the assembly step of the car, the selection criteria of the steel sheet used as the structural components of the car are also important. [0003] However, in terms of welding of the steel sheet, for example, as described in Patent Document 1, the decrease in the strength of the weld joint is a problem. It is believed that in the case where the toughness of the solder joint formed during welding is low, cracking in the solder joint and develops, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60B22D1/00C21D9/46
CPCC21D9/46C22C38/60B22D11/007B22D11/108B22D11/11C22C38/02C22C38/04C22C38/38C22C38/58C22C38/002C22C38/12C22C38/14C22C38/06C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C23C2/40C23C2/28C23C2/06B32B15/013C21D2211/004C21D2211/001C21D6/005C21D2211/005C21D8/021C21D8/0226C21D8/0263C21D8/0273C21D1/20C21D1/19C25D3/22C25D5/36C25D7/0614C22C38/001C21D8/0236
Inventor 铃木裕也
Owner NIPPON STEEL CORP
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