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Hot-rolled steel sheet, cold-olled steel sheet, and plated steel sheet each having exellent uniform ductility and local ductility in high-speed deformation

一种热轧钢板、冷轧钢板的技术，应用在热浸镀工艺、热处理炉、热处理设备等方向，达到局部韧性提升、改善碰撞安全性、有效效果的效果

Inactive Publication Date: 2013-08-14
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Patent Document 4 discloses nothing about the impact absorbed energy in the strain rate range lower than 2000 / s

Method used

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  • Hot-rolled steel sheet, cold-olled steel sheet, and plated steel sheet each having exellent uniform ductility and local ductility in high-speed deformation
  • Hot-rolled steel sheet, cold-olled steel sheet, and plated steel sheet each having exellent uniform ductility and local ductility in high-speed deformation
  • Hot-rolled steel sheet, cold-olled steel sheet, and plated steel sheet each having exellent uniform ductility and local ductility in high-speed deformation

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Experimental program
Comparison scheme
Effect test

Embodiment

[0125] (hot rolled steel plate)

[0126] Experiments were conducted using slabs (35 mm in thickness, 160 to 250 mm in width, and 70 to 90 mm in length) formed of steel grades A, B, C, D, and E having chemical compositions shown in Table 1. Steel types A to C and E have chemical compositions within the range specified by the present invention, and steel D has a chemical composition other than that of the present invention.

[0127] [Table 1]

[0128] steel type

C

Si

mn

P

S

Cr

Ti

Nb

V

AI

N

Ae 3

A

0.15

0.54

2.02

0.001

0.002

0.25

0.010

-

-

0.035

0.0025

845

B

0.15

0.53

2.04

0.001

0.002

0.25

0.010

0.008

-

0.033

0.0021

841

C

0.15

0.52

2.01

0.002

0.002

0.25

0.010

-

0.05

0.033

0.0030

847

D

0.16

0.51

2.01

0.013

0.002

0.051

0.057

...

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Abstract

The present invention relates to a hot-rolled steel sheet, a cold-rolled steel sheet, and a plated steel sheet having improved uniform ductility and local ductility at a high strain rate. A multi-phase hot-rolled steel sheet according to one mode of the present invention has a metallurgical structure having a main phase of ferrite with an average grain diameter of at most 3.0 µm and a second phase including at least one of martensite, bainite, and austenite. In the surface layer, the average grain diameter of the second phase is at most 2.0 µm, the difference (”nH av ) between the average nanohardness of the main phase (nH ±av ) and the average nanohardness of the second phase (nH 2nd av ) is 6.0 - 10.0 GPa, the difference (”ÃnH) of the standard deviation of the nanohardness of the second phase from the standard deviation of the nanohardness of the main phase is at most 1.5 GPa, and in the central portion, the difference (”nH av ) between the average nanohardnesses is at least 3.5 GPa to at most 6.0 GPa and the difference (”ÃnH) between the standard deviations of the nanohardnesses is at least 1.5 GPa.

Description

technical field [0001] The invention relates to a hot-rolled steel plate, a cold-rolled steel plate and a plated steel plate with excellent uniform toughness and local toughness under high-speed deformation. Background technique [0002] In recent years, from the viewpoint of global environmental protection, as a way to reduce CO2 from automobiles 2 As part of the emission volume, it is required to reduce the weight of the car body. Since it is not allowed to reduce the required strength of the vehicle body due to the reduction in weight, the increase in the strength of steel sheets for automobiles is being promoted. [0003] On the other hand, the social demand for ensuring the collision safety of automobiles is gradually increasing. Therefore, the properties required for steel sheets for automobiles are not only high strength, but also excellent impact resistance in the event of a collision during driving, that is, high deformation resistance when deformation occurs at a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/38C22C38/58
CPCC21D8/0426C21D9/46C23C2/02C23C2/28C21D9/48C21D2211/005C21D2211/001C21D8/0436C21D2211/002C21D8/0463C21D8/0221C21D2211/008C22C38/06C22C38/26C21D8/04C22C38/02C22C38/28C22C38/001C22C38/38C22C38/24C23C2/0224C23C2/024
Inventor 河野佳织田中泰明富田俊郎
Owner NIPPON STEEL CORP
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