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Cold-rolling strip steel used for automobile flywheel processed by precision stamping and manufacture method thereof

A technology of cold-rolled steel strip and precision stamping, applied in the field of cold-rolled steel strip, which can solve the problems of inability to meet precision stamping forming, high manufacturing cost of cold-rolled steel strip, mismatch between high strength and toughness of cold-rolled steel strip, etc. Achieve the effects of reducing the annealing temperature and annealing holding time, reducing energy consumption, and reducing material heat treatment consumption

Active Publication Date: 2016-12-28
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a precision stamping cold-rolled steel strip for automobile flywheels and its manufacturing method, which solves the problems of high manufacturing cost, high strength and poor toughness of the existing cold-rolled steel strips used for precision stamping. Matching, can not meet the technical problems of precision stamping

Method used

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  • Cold-rolling strip steel used for automobile flywheel processed by precision stamping and manufacture method thereof
  • Cold-rolling strip steel used for automobile flywheel processed by precision stamping and manufacture method thereof
  • Cold-rolling strip steel used for automobile flywheel processed by precision stamping and manufacture method thereof

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with Examples 1-4 and Comparative Example 1—disclosed in Chinese Patent Application 200780004015.3, and Comparative Example 2—disclosed in Chinese Patent Application 200910196007.4, as shown in Tables 1 to 4.

[0044] Table 1 Chemical composition of the present invention (mass percentage %), the balance is Fe and unavoidable impurities.

[0045]

[0046] The molten steel that meets the required chemical composition is obtained through converter melting. The molten steel is refined in the LF ladle refining furnace, and the RH furnace is subjected to vacuum cycle degassing treatment. The pure degassing time of RH is more than 10 minutes, and then continuous casting is carried out to obtain continuous casting steel slabs with a thickness of 210~ 230mm, width 1000~1500mm, length 5000~11000mm.

[0047] The continuous casting steel billet adopts the hot charging and hot delivery process, and is directly s...

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Abstract

The invention relates to a cold-rolling strip steel used for an automobile flywheel processed by precision stamping and a manufacture method thereof, which solves the technical problems that the manufacture cost of the cold-rolling strip steel used for precision stamping is high, the high strength and toughness of the cold-rolling strip steel are not matched, and the precision stamping moulding cannot be satisfied. The cold-rolling strip steel comprises the following chemical components by mass percentage: 0.49-0.54% of C, 0.15-0.30% of Si, 0.70-0.90% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S, 0.10-0.20% of Cr, 0.015-0.040% of Alt, and the balance of iron and unavoidable impurity. The structure is composed of block ferrite, granular pearlite and a few of sheet-shaped pearlite, the yield strength of the cold-rolling strip steel is 410-460 MPa, and the percentage elongation after fracture A50 is 25-33%. The cold-rolling strip steel is used for fine blanking of the automobile flywheels.

Description

technical field [0001] The invention relates to a cold-rolled steel strip for precise stamping, in particular to a precision stamped cold-rolled steel strip for automobile flywheels and a manufacturing method thereof. Background technique [0002] The hot-rolled steel strip produced by the hot rolling mill generally needs to undergo spheroidizing annealing and other treatments to improve the internal structure of the material so that the strength and plasticity of the material can be well matched. Widely used in precision stamping (hereinafter referred to as fine blanking) industries, such as: automobiles, machinery, hardware, electrical equipment, textiles, cameras, clocks, instruments, communication electronics and other precision parts. Traditional precision parts processing methods have many procedures and poor precision, and are generally completed by general punching, machining, forging, casting and powder metallurgy processing. After the fine blanking process is adop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C21D8/04
Inventor 马植甄穆海玲王海军
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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