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Hot rolling high reaming steel plate having 440MPa grade of tensile strength and manufacturing method thereof

A technology of tensile strength and manufacturing method, applied in the direction of metal rolling, manufacturing tools, metal rolling, etc., to achieve good hole expansion performance, cost reduction, and easy production

Inactive Publication Date: 2009-01-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] JP2006063394 discloses a hot-rolled high-hole expansion steel with a carbon content of 0.20-0.48%, and its tensile strength is also ≥440MPa, but its hole expansion rate is only ≥70%, and annealing at 640°C is required after hot rolling

Method used

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  • Hot rolling high reaming steel plate having 440MPa grade of tensile strength and manufacturing method thereof
  • Hot rolling high reaming steel plate having 440MPa grade of tensile strength and manufacturing method thereof
  • Hot rolling high reaming steel plate having 440MPa grade of tensile strength and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] Through smelting, casting, hot rolling and cooling processes, the finished steel with the chemical composition described in the following table 1 is obtained, with a thickness of 3mm, and then the mechanical performance test (according to the GB6397-86 standard) and the hole expansion performance test (JFST1001-1996 standard conduct). The rolling process parameters, mechanical properties, and hole expansion properties are shown in Table 11 below.

[0038] The chemical composition (wt%) of table 1 embodiment 1 steel

[0039]

Embodiment 2

[0041] Through smelting, casting, hot rolling and cooling processes, the finished steel with the chemical composition described in the following table 2 is obtained, the thickness is 3mm, and then the mechanical performance test (according to the GB6397-86 standard) and the hole expansion performance test (JFST1001-1996 standard conduct). The rolling process parameters, mechanical properties, and hole expansion properties are shown in Table 11 below.

[0042] Chemical composition (wt%) of steel of table 2 embodiment 2

[0043]

Embodiment 3

[0045] Through smelting, casting, hot rolling and cooling processes, the finished steel with the chemical composition described in the following table 3 is obtained, the thickness is 3mm, and then the mechanical performance test (according to the GB6397-86 standard) and the hole expansion performance test (JFST1001-1996 standard conduct). The rolling process parameters, mechanical properties, and hole expansion properties are shown in Table 11 below.

[0046] Chemical composition (wt%) of table 3 embodiment 3 steel

[0047]

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Abstract

The invention provides a hot-rolled high reaming steel sheet with tensile strength of 440MPa, comprising the following chemical composition (weight percent): C: 0.01 to 0.06 percent, Si: 0 to 0.6 percent, Mn: 0.8 to 1.3 percent, P: less than or equal to 0.035 percent, S: less than or equal to 0.010 percent, Al: 0.025 to 0.060 percent, N: less than or equal to 0.0060 percent, Nb: 0 to 0.25 percent, and the rest are Fe and inevitable impurities. The invention also provides a preparation method of the hot-rolled high reaming steel sheet, and the method does not need heat treatment, can reduce the cost, and needs no complicated control of cooling technology after hot rolling, which is convenient for production. The steel sheet provided by the invention has good reaming performance, moldability and cold processing performance, and is mainly used for the molding and processing of parts with complicated shapes for automobile chassis.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular, the invention relates to a hot-rolled high-hole expansion steel plate material. Background technique [0002] In recent years, due to the increasing awareness of human environmental protection, reducing the fuel consumption of cars and reducing CO 2 Emissions have become a common global voice, among the various measures to achieve this goal, vehicle weight reduction is a very effective means. This global trend and the emphasis on automobile safety have brought about the demand for various advanced new steel materials with high strength and good processing performance. [0003] Hot-rolled steel plates are mainly used for car chassis, wheels, suspension and their surrounding parts, and its weight accounts for more than 25% of the total weight of the car body. In the prior art, the structures of high-strength hot-rolled steel sheets with excellent processability include: ferrite-marte...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14B21B37/00C21D8/02
Inventor 张建苏
Owner BAOSHAN IRON & STEEL CO LTD
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