A low-yield ratio hot-rolled pickled steel plate with a tensile strength of 600mpa

A hot-rolled pickling and tensile strength technology, which is applied in the field of hot-rolled pickled steel sheets, can solve the problems of inability to meet the manufacturing requirements of complex-shaped auto parts, the mismatch between stamping performance and hole expansion performance, and achieve excellent stamping performance and The effect of good hole expansion performance, comprehensive forming performance and good hole expansion performance

Active Publication Date: 2022-04-15
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0009] The purpose of the present invention is to provide a low yield ratio hot-rolled pickled steel plate with a tensile strength of 600MPa and its manufacturing method, which mainly solves the mismatch between the stamping performance and the hole expansion performance of the existing 600MPa-level hot-rolled pickled steel plate and cannot meet the requirements. Technical Issues of Complex Shaped Auto Parts Manufacturing Needs

Method used

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  • A low-yield ratio hot-rolled pickled steel plate with a tensile strength of 600mpa
  • A low-yield ratio hot-rolled pickled steel plate with a tensile strength of 600mpa
  • A low-yield ratio hot-rolled pickled steel plate with a tensile strength of 600mpa

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with Examples 1 to 5, as shown in Tables 1 to 5. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0042] Table 1 is the chemical composition (by weight percentage) of the steel of the embodiment of the present invention, and the balance is Fe and unavoidable impurities.

[0043] Table 1 Chemical composition of the steel of the embodiment of the present invention, unit: weight percent.

[0044]

[0045] The molten steel that meets the chemical composition requirements is obtained through converter smelting, and the molten steel is blown by Ar in the refining process of the LF ladle refining furnace, and the molten steel is continuously cast by continuous blowing of Ar to obtain a continuous casting slab; the thickness of the continuous casting slab is 210-230mm, and the ...

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Abstract

The invention discloses a hot-rolled pickling steel plate with a tensile strength of 600 MPa and low yield strength ratio, which mainly solves the mismatch between the punching performance and the hole expansion performance of the existing 600 MPa hot-rolling pickling steel plate, and cannot meet the requirements of manufacturing auto parts with complex shapes. Technical issues required. The hot-rolled pickled steel plate provided by the invention has the following chemical composition weight percentages: C: 0.06-0.08%, Mn: 0.8-1.2%, Si: 0-0.10%, P: 0-0.020%, S: 0-0.006 %, Alt: 0.015-0.050%, N: 0-0.005%, Ti: 0.03-0.05%, and the balance is Fe and unavoidable impurity elements. The yield ratio of the 2.0-4.0mm thick hot-rolled pickled steel plate of the present invention is ≤0.80, and the elongation after fracture is A 50mm 25-35%, and the expansion performance λ≥75%. The steel plate of the invention is used for making automobile structural parts.

Description

technical field [0001] The invention relates to a hot-rolled pickled steel plate, in particular to a hot-rolled pickled steel plate with a tensile strength of 600 MPa and a low yield ratio and a manufacturing method thereof. The steel plate of the invention has good stamping performance and hole expansion performance, and meets the requirements of auto parts. The manufacturing requirement belongs to the technical field of iron-based alloys. Background technique [0002] Hot-rolled pickled automobile structural steel is a kind of hot-rolled steel plate. After pickling treatment, the surface quality has been greatly improved, which makes the steel plate have both low cost of hot plate and good size and shape accuracy. It is widely used in Automotive chassis, wheels and other structural parts. Such structural parts account for about 25% of the weight of the car body, so the automotive industry has increasingly high expectations for materials with high strength and low weight. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C22C33/04C21D8/02C23G1/08
CPCC22C38/04C22C38/02C22C38/06C22C38/14C22C38/001C22C33/04C21D8/0205C21D8/0226C21D8/0263C23G1/08
Inventor 陈维晋刘友荣蒙黔川裴新华
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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