Advanced-high strength hot-rolled steel sheet and method for manufacturing same

A hot-rolled steel plate, ultra-high strength technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of difficulty in producing thick hot-rolled coils, poor linear mobility, and high plate breakage.

Active Publication Date: 2020-03-06
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] This is because the traditional short-flow process adopts the intermittent method of winding the strip (Bar Plate) in the coil box (Coil Box) and then uncoiling. This process is required for each production of a...

Method used

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  • Advanced-high strength hot-rolled steel sheet and method for manufacturing same
  • Advanced-high strength hot-rolled steel sheet and method for manufacturing same
  • Advanced-high strength hot-rolled steel sheet and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0219] Molten steel having the composition shown in Table 1 below was prepared. In addition, the initial critical C content of the hypoperitectic reaction is shown in Table 1 below, which is a value calculated using the conventional thermodynamic software Thermo-Calc-3.0.1 command mode (Console Mode) (Database (database): TCFE6).

[0220] Utilize described molten steel according to the manufacturing conditions of following table 2 in the continuous casting-rolling direct-connection process to manufacture the hot-rolled steel plate (invention example 1-7 and comparative example 1-11) that thickness is 1.6mm by endless rolling mode . Existing Example 1 is a hot-rolled steel plate with a thickness of 3.2 mm manufactured in batch mode in a traditional short-flow process using the manufacturing conditions shown in Table 2.

[0221] Ar is shown in Table 2 below 3 temperature and Mf temperature, the Ar 3 The temperature and the Mf temperature are values ​​calculated using conventi...

Embodiment 2

[0256] The process of applying the steel plate according to the present invention to the automobile body to produce the final product is mostly a welding process, and resistance spot welding (Resistance Spot Welding, hereinafter referred to as RSW) is the most commonly implemented welding. Therefore, it is necessary to evaluate the RSW welded part of the steel plate. Evaluation of the RSW welded portion of the steel plate of Invention Example 7 of Example 1, the results are shown in Figure 14 to Figure 17 .

[0257] At this time, the evaluation of the RSW welded part is carried out in accordance with the provisions of ISO 18728-2 shown in Table 4 below, and the welding current that has the greatest influence on the nugget diameter and strength is changed at intervals of 0.2 (kA), and the weldability and welded part The tensile properties were evaluated.

[0258] 【Table 4】

[0259]

[0260] Figure 14 The change of the nugget (Nugget) cross-sectional structure according...

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Abstract

The present invention relates to an advanced-high strength hot-rolled steel sheet, having tensile strength of 980MPa, and a method for manufacturing same, the method enabling enhanced surface quality,processability and weldability as well as significantly reduced deviation of the material in the width and length directions of the steel sheet by means of an endless rolling mode in a continuous casting-direct rolling process. According to a preferable aspect of the present invention, provided are an advanced-high strength hot-rolled steel sheet, having a microstructure, and a method for manufacturing same, the advanced-high strength hot-rolled steel sheet manufactured by means of a continuous casting-direct rolling process and comprising, in weight %, 0.030-0.085% of C, 1.8-3.0% of Mn, 0.03-1.0% of Si, 0.005-0.05% of P, 0.01% or less of S, 0.2-2.0% of Cr, 0.01-0.07% of Al, 0.005-0.10% of Ti, 0.0005-0.0050% of B, 0.001-0.010% of N, the remainder being Fe, and other inevitable impuritiesand, in an area fraction, 40-60% of ferrite, 30-50% of martensite and 10-20% of bainite.

Description

technical field [0001] The invention relates to an ultra-high-strength hot-rolled steel plate and a manufacturing method thereof. More specifically, the present invention relates to an ultra-high-strength hot-rolled steel plate with a tensile strength of 980 MPa in the continuous casting-rolling direct connection process, which has a small material deviation, excellent surface quality and weldability, and its Manufacturing method. Background technique [0002] Recently, the safety regulations for car passengers and pedestrians have been strengthened, requiring the installation of safety devices, which runs counter to the concept of reducing weight and improving fuel efficiency of vehicles, so there is a problem of increased vehicle body weight. [0003] In addition, consumer interest in environmentally friendly and fuel-efficient hybrid and electric vehicles is increasing. In order to produce such an environmentally friendly and safe car, it is necessary to ensure the weig...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/06C22C38/02C22C38/28C22C38/32C21D8/02C21D9/46B21B45/08
CPCB21B45/08C21D8/02C21D9/46C22C38/02C22C38/06C22C38/28C22C38/32C22C38/38C21D8/0247C21D2211/005C21D2211/004C21D2211/008
Inventor 孔锺判郑济淑
Owner 浦项股份有限公司
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