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High-strength hot-rolled steel plate

一种热轧钢板、高强度的技术，应用在金属轧制、热处理炉、热处理设备等方向，能够解决焊接施工操作性差等问题，达到疲劳特性优异的效果

Inactive Publication Date: 2014-04-16
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires preheating work before welding, and there is a problem that the workability of welding work is poor.

Method used

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  • High-strength hot-rolled steel plate
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  • High-strength hot-rolled steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] A test steel having the composition shown in Table 1 below was vacuum-melted to obtain a test material having a plate thickness of 30 mm. by figure 1 With the program shown and the conditions shown in Table 2 below, this test material was hot-rolled to produce a hot-rolled steel sheet. More specifically, after the heating temperature HT is maintained for 30 minutes, the finish rolling is performed at the finish rolling temperature FDT, and the final plate thickness is 3 mm. After finishing rolling, it is cooled to the rapid cooling stop temperature Tm at the first rapid cooling rate RCR1, and only allowed to cool for the cooling time (slow cooling time) tm. In addition, the cooling rate (slow cooling rate) MCR during standing cooling is 10° C. / s or less. Thereafter, it is cooled to the coiling temperature CT at the second rapid cooling rate RCR2, kept for 30 minutes, and then furnace cooled.

[0111] For the hot-rolled steel sheet (corresponding to the base material)...

Embodiment 2

[0129] A test steel having the composition of each component shown in Table 4 below was vacuum melted to obtain a test material having a plate thickness of 30 mm. by figure 1 The program shown and the conditions shown in the following Table 5 were hot-rolled with respect to this test material, and the hot-rolled steel plate was produced. More specifically, after the heating temperature HT is maintained for 30 minutes, the finish rolling is performed at the finish rolling temperature FDT, and the final plate thickness is 3 mm. After finishing rolling, it is cooled to the rapid cooling stop temperature Tm at the first rapid cooling rate RCR1, and only allowed to cool for the cooling time (slow cooling time) tm. In addition, the cooling rate (slow cooling rate) MCR during standing cooling is 10° C. / s or less. Afterwards, cool to the coiling temperature CT at the second rapid cooling rate RCR2, keep it for 30 minutes, and then carry out furnace cooling.

[0130] For the hot-rol...

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Abstract

This high-strength hot-rolled steel plate contains specific amounts of C, Si, Mn, Al, V and also Ti and / or Nb so as to fulfill C-12(V / 51+Ti / 48+Nb / 93)>0.03, and the rest consists of iron and unavoidable impurities. Ferrite is the main structure, the remaining structure is one or more selected from the group consisting of bainite, martensite and retained austenite, wherein the average particle diameter of precipitated carbides (the total content of V, Ti and Nb is 0.02% or greater) in the ferrite is less than 6nm.

Description

technical field [0001] The present invention relates to a high-strength hot-rolled steel sheet, in particular to a high-strength hot-rolled steel sheet used for parts requiring strength, workability and fatigue characteristics such as chassis and frame parts of automobiles. Background technique [0002] In recent years, thin steel sheets for automobile parts have been increased in strength in order to improve crash safety and fuel efficiency. Chassis parts and frame parts of automobiles have also been strengthened, but in order to reduce the weight of parts, it is necessary to improve both static strength and fatigue strength. In addition, in order to process it into a complicated shape, it is also required to balance workability (ductility, stretch-flangeability). [0003] In improving workability, it is known that DP steel composed of two types of structure with a large strength ratio is effective. In addition, as a method of improving the fatigue characteristics of DP st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B1/26B21B3/00C22C38/14C22C38/58C21D9/46
CPCC22C38/14C22C38/28C22C38/04C21D9/46C22C38/001C21D2211/004C21D9/00C22C38/02C21D8/0226C22C38/12C22C38/06C22C38/08C21D2211/005C22C38/16C22C38/24C21D2211/002
Inventor 村上俊夫杵渊雅男畠英雄
Owner KOBE STEEL LTD
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