Ultrahigh-strength hot-rolled complex phase steel plate and steel strip with good bending and broaching performance and manufacturing method thereof

A technology of bending properties and manufacturing methods, applied in the fields of products, ultra-high strength hot-rolled multi-phase steel sheets and steel strips and their manufacturing

Inactive Publication Date: 2015-04-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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But this kind of steel has many problem

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  • Ultrahigh-strength hot-rolled complex phase steel plate and steel strip with good bending and broaching performance and manufacturing method thereof
  • Ultrahigh-strength hot-rolled complex phase steel plate and steel strip with good bending and broaching performance and manufacturing method thereof
  • Ultrahigh-strength hot-rolled complex phase steel plate and steel strip with good bending and broaching performance and manufacturing method thereof

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with embodiment.

[0040] The steels with different compositions shown in Table 1 were smelted and then reheated at 1250°C, followed by hot rolling and coiling at the finishing rolling and coiling temperatures shown in Table 2 to obtain steel plates with a thickness of less than 6mm. Take the JIS 5# tensile specimen along the transverse direction, and the test data are shown in Table 2. Cold bending performance refers to the performance of metal materials that can withstand bending without cracking at room temperature. The degree of bending is generally expressed by the ratio of bending angle α (external angle) and bending center diameter d to material thickness a. The larger a or the smaller d / a, the better the cold bending property of the material. The cold bending performance in Table 2 is the cold bending diameter of 180° bending. The hole expansion test is a sheet formability test. Use the punc...

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Abstract

The invention discloses an ultrahigh-strength hot-rolled complex phase steel plate and steel strip with good bending and broaching performance and a manufacturing method thereof. The ultrahigh-strength hot-rolled complex phase steel plate and steel strip comprise the following components in percentage by weight: 0.07-0.14% of C, 0.1-0.4% of Si, 1.55-2.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.004% of S, 0.01-0.05% of Al and less than or equal to 0.005% of N, and further comprises at least one of alloy elements of less than or equal to 0.07% of Nb, 0.02-0.15% of Ti and 0.10-0.20% of V, at least one of alloy elements of 0.15-0.50% of Cr and 0.15-0.50% of Mo, and the balance of Fe and inevitable impurities. The ultrahigh-strength hot-rolled complex phase steel has the tensile strength of above 800 MPa, the yield strength of above 700 MPa, the cold bending performance of 0a at 180 DEG C, the broaching rate of above 50%, and the microstructure of bainite (at least 80%) and a small amount of ferrite, martensite and retained austenite, wherein the bainite is mainly lower bainite. The ultrahigh-strength hot-rolled complex phase steel can be applied to manufacture of an automobile chassis, a hanging component, a bumper and other products.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to an ultra-high-strength hot-rolled multi-phase steel plate and a steel strip with good bending and hole expansion properties and a manufacturing method thereof, which are mainly used in manufacturing automobile chassis, suspension parts, bumpers and other products. Background technique [0002] The "light weight" of automobiles can directly reduce emissions and fuel consumption, which is the goal of the development of today's automobile manufacturing industry. Over the past decade, the weight of automobiles has increased year by year due to increased requirements in terms of comfort and safety features. An important measure of automobile "lightweight" is to use high-strength steel and ultra-high-strength steel plate instead of mild steel. After a large number of high-strength steels are used, a 20-25% weight reduction effect can be achieved. [0003] At present, ultra-high-strength ...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/14C21D8/02
Inventor 张玉龙洪继要韩启航王利
Owner BAOSHAN IRON & STEEL CO LTD
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