Ultra-high-strength hot-rolled steel sheet and manufacturing method thereof

A hot-rolled steel plate, ultra-high strength technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of poor linear mobility, difficulty in producing thick hot-rolled coils, and plate breakage, etc. Achieve excellent yield, save energy, and reduce material deviation

Active Publication Date: 2022-01-25
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 steel plate, so the strip Steel (Strip) has poor linear movement and sheet passability, and the risk of sheet breakage is very high, making it difficult to produce hot-rolled coils (Coil) with a thickness of 3.0 mm or less

Method used

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  • Ultra-high-strength hot-rolled steel sheet and manufacturing method thereof
  • Ultra-high-strength hot-rolled steel sheet and manufacturing method thereof
  • Ultra-high-strength hot-rolled steel sheet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0219] Preparing molten steel having components shown in Table 1 below. Further, Table 1 shows the initial critical reaction hypoperitectic C content, which is the use of a conventional thermodynamic software Thermo-Calc-3.0.1 command mode (Console Mode) (Database (database): TCFE6) value calculated.

[0220] Using the steel according to the manufacturing conditions in Table 2 in a continuous casting - rolling process are directly connected by an endless rolling for manufacturing mode hot rolled steel sheet of 1.6mm thickness (Inventive Examples 1-7 and Comparative Examples 1-11) . Example 1 is a conventional manufacturing conditions shown in Table 2 in a conventional shortened process in batch mode produced by the hot rolled steel sheet having a thickness of 3.2mm to.

[0221] Shown in Table 2 Ar 3 And temperature Mf temperature, the Ar 3 Mf temperature and temperature using a conventional thermodynamic values ​​calculated JmatPro-v9.1 software.

[0222] In Table 2, RSB (Roughing...

Embodiment 2

[0256] Most of the steel sheets that meet the present invention are applied to the automotive body to produce the final product to carry out welding processes, while resistance spot welding, hereinafter referred to as RSW) is the most commonly implemented welding. Therefore, the evaluation of the RSW welding portion is required for the steel sheet. The evaluation of the RSW welding portion is performed on the steel sheet of Example 7 of Example 1. Figure 14 to 17 .

[0257] At this time, the evaluation of the RSW welded portion is carried out according to the provisions of the ISO 18728-2 shown in Table 4, and changes the welding current of the melted diameter and intensity of the melted diameter and intensity by 0.2 (ka) intervals. The tensile characteristics were evaluated.

[0258] 【Table 4】

[0259]

[0260] Figure 14 A nugget cross-sectional tissue change is shown for the inventive example 7. As shown in the sectioned section of the melt-cut 1 / 2, the melted diameter is def...

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Abstract

The present invention relates to an ultra-high-strength hot-rolled steel sheet with a tensile strength of 980 MPa class and a manufacturing method thereof, which have excellent surface quality, workability, and weldability by utilizing an endless rolling mode in a continuous casting-rolling direct process At the same time, the material deviation in the width and length directions of the steel plate is significantly reduced. According to a preferred aspect of the present invention, there is provided an ultra-high-strength hot-rolled steel plate and a manufacturing method thereof, which are produced by continuous casting-rolling direct connection process, and in weight %, the steel plate contains C: 0.030% to 0.085%, Mn: 1.8 %~3.0%, Si: 0.03%~1.0%, P: 0.005%~0.05%, S: 0.01% or less, Cr: 0.2%~2.0%, Al: 0.01%~0.07%, Ti: 0.005%~ 0.10%, B: 0.0005% to 0.0050%, N: 0.001% to 0.010%, the balance of Fe and other unavoidable impurities, and the steel plate has a fine structure, in terms of area fraction, the fine structure contains 40% to 60% Ferrite, 30% to 50% martensite and 10% to 20% bainite.

Description

Technical field [0001] The present invention relates to an ultra high intensity hot rolled steel sheet and a method of manufacturing the same. More specifically, the present invention relates to a continuous-cast-rolling straight-circuit process with a small high-strength hot rolled steel sheet having a small material deviation of 980 MPa level and excellent surface quality and weldability. Production method. Background technique [0002] Recently, the safety regulations of automotive passengers and pedestrians have recently been strengthened, and the safety devices must be installed, which is in turn to reduce the weight of the vehicle fuel efficiency, so there is an increase in the weight of the vehicle body. [0003] In addition, consumers are increasing in the interest of hybrid vehicles and electric vehicles with high environmental protection and fuel efficiency. To produce this environmentally friendly and safe car, it should ensure the lightweight and the safety of the veh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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