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Preparation method of graphitized cold-rolled high-carbon steel plate for stamping forming

A technology of stamping forming and graphitization, which is applied in the field of metallurgy, can solve the problems affecting the stamping performance of steel plates and the inability to obtain graphite particles, etc., and achieve the effects of low hardness, good stamping performance and high plasticity

Active Publication Date: 2017-07-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, due to the uneven distribution of cementite, uniform distribution of graphite particles cannot be obtained, which will affect the stamping performance of the steel plate

Method used

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  • Preparation method of graphitized cold-rolled high-carbon steel plate for stamping forming

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of 1.0mm graphitized cold-rolled steel plate, the main process flow: smelting, continuous casting, hot rolling, pickling, cold rolling, bainite treatment and graphitization annealing.

[0022] The chemical composition (mass fraction / %) of the graphitized hot-rolled steel sheet of this embodiment is: 0.46C, 0.17Si, 0.72Mn, 0.010S, 0.009P, 0.026Al, 0.0036B, 0.0050N.

[0023] The main process parameters of bainite treatment are: use 840°C isothermal treatment, and after treatment, rapidly cool to 320°C at a cooling rate greater than 15°C / s for isothermal transformation.

[0024] The main process parameters of the graphitization annealing are: the graphitization temperature is 680°C, and the graphitization annealing time is 6 hours.

[0025] The graphitized cold-rolled high-carbon steel plate prepared by the above method was sampled, analyzed and tested, and the results showed that the graphite particles observed in the structure were evenly distributed, nea...

Embodiment 2

[0027] The preparation of 3.0mm graphitized cold-rolled steel plate, the main process flow: smelting, continuous casting, hot rolling, pickling, cold rolling, bainite treatment and graphitization annealing.

[0028] The chemical composition (mass fraction / %) of the graphitized hot-rolled steel sheet in this embodiment is: 0.67C, 0.12Si, 0.76Mn, 0.008S, 0.006P, 0.025Al, 0.0030B, 0.0040N.

[0029] The main process parameters of bainite treatment are: use 800°C isothermal treatment, and after treatment, rapidly cool to 300°C at a cooling rate greater than 20°C / s for isothermal transformation.

[0030] The main process parameters of the graphitization annealing are: the graphitization temperature is 660° C., and the graphitization annealing time is 5 hours.

[0031]The graphitized cold-rolled high-carbon steel plate prepared by the above method was sampled, analyzed and tested, and the results showed that the graphite particles observed in the structure were evenly distributed, ne...

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Abstract

The invention discloses a preparation method of a graphitized cold-rolled high-carbon steel plate for stamping forming, and belongs to the technical field of metallurgy. The preparation method is characterized in that besides conventional methods like smelting, continuous casting, hot rolling, acid pickling and cold rolling, technological processes like bainite treatment and graphitizing annealing are adopted, wherein the bainite treatment is adopted for providing a good preparation structure for the graphitizing annealing; isothermal transformation is carried out in a manner that isothermal treatment with the temperature being 30-50 DEG C above Ac3 is carried out and then rapid cooling to a lower bainite transition temperature range is carried out; and the graphitizing annealing mainly adopts the isothermal treatment with the temperature being 620 DEG C to Ac1. The steel plate prepared by the preparation method mainly consists of graphite and ferrite grains structurally, graphite particles are distributed uniformly, the mean diameter of the graphite particles is approximately 5 micrometers, and the mean diameter of the ferrite grains is approximately 20 micrometers. Due to such structural characteristics, the high-carbon steel plate has the same plasticity and softness as low-carbon steel, and thus has the good stamping forming property, a yield ratio of the high-carbon steel plate is less than or equal to 0.60, the strain hardening exponent is greater than or equal to 0.2, and the planar anisotropy is less than or equal to 0.20.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a method for preparing a graphitized cold-rolled high-carbon steel plate for stamping. Background technique [0002] In recent years, in order to achieve low fuel consumption and improve the competitiveness of automobile costs, high-carbon steel plates have been used for integrated stamping of automobile transmission parts such as complex shapes and high strength. This technology not only requires materials to have good Stamping performance, but also requires sufficient hardenability in the heat treatment process after forming to meet the strength requirements of parts in service. [0003] However, high-carbon steel plates have high strength and hardness, poor plasticity and processability, and are difficult to form such parts. It is necessary to develop a new type of high-carbon steel. [0004] In order to improve the formability of high-carbon steel plates, the main method cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D1/20C21D1/26C21D6/00
CPCC21D1/20C21D1/26C21D6/005C21D6/008C21D2211/005C21D2211/006C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 张永军韩静涛刘靖余万华张鹏程
Owner UNIV OF SCI & TECH BEIJING
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