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Hot-rolled pickled sheet with low yield ratio and production method thereof

A hot-rolled pickling, low yield-to-strength ratio technology, applied in the field of steel rolling, can solve the problems of high cost and large amount of alloying elements added.

Active Publication Date: 2013-05-22
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of large addition of alloy elements and high cost of the existing low yield ratio hot-rolled pickling sheet, and provide a low-yield ratio hot-rolled pickling sheet with small addition and low cost. its production method

Method used

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  • Hot-rolled pickled sheet with low yield ratio and production method thereof
  • Hot-rolled pickled sheet with low yield ratio and production method thereof
  • Hot-rolled pickled sheet with low yield ratio and production method thereof

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Embodiment Construction

[0020] The present invention provides a low-yield-ratio hot-rolled pickling plate, the mass percent of its chemical composition is: C: 0.04-0.12, Si: 0.005-0.05, Mn: 0.8-1.5, P≤0.020, S≤0.020, Al : 0.01~0.08, B: 0.0005~0.003, the balance is Fe and trace elements. An appropriate amount of B can coarsen ferrite grains and reduce the yield strength of strip steel, but the addition of B element has a great influence, too little will not achieve the effect of coarsening, too much will easily form bainite or martensitic Tensile phase, affecting the formability of the strip. The present invention determines that its content is 0.0005-0.003.

[0021] The invention provides a method for producing the above-mentioned low yield ratio hot-rolled pickling plate, comprising:

[0022] Step S1: The mass percentage of the chemical composition obtained through converter or electric furnace smelting is: C: 0.04-0.12, Si: 0.005-0.05, Mn: 0.8-1.5, P≤0.020, S≤0.020, Al: 0.01-0.08, B: 0.0005~0.00...

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Abstract

The invention discloses a hot-rolled pickled sheet with a low yield ratio. The hot-rolled pickled sheet comprises the following chemical components in percentage by mass: 0.04-0.12 of C, 0.005-0.05 of Si, 0.8-1.5 of Mn, less than or equal to 0.020 of P, less than or equal to 0.020 of S, 0.01-0.08 of Al, 0.0005-0.003 of B and the balance of Fe and trace elements. The invention also discloses a method for producing the hot-rolled pickled sheet with the low yield ratio. According to the hot-rolled pickled sheet with the low yield ratio and the production method thereof, a proper element content proportion is given through analog computation of influence of each element on yield strength and tensile strength by utilizing a common C-Mn component system, and the content of the alloy elements isless, thus production cost can be greatly reduced; a hot rolling process window is wide, which is convenient for production and implementation; and the property of a finished product is excellent, and the yield ratio reaches the requirement of a cold plate. The production method provided by the invention is an economical and effective hot-rolled pickled sheet production method and meets the requirements of green steel and low-carbon economy.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a low yield ratio hot-rolled pickled plate and a production method thereof. Background technique [0002] Hot-rolled pickled plate is an intermediate product between cold-rolled and hot-rolled. It has a surface quality close to that of cold-rolled plate while maintaining the mechanical properties of hot-rolled products. It has a wide range of applications. In recent years, hot-rolled As a cost-effective stamping steel, pickled sheet is widely used in fields requiring high formability, such as automobiles and home appliances. In view of the fact that the yield ratio is an important performance index of stamping steel, it directly affects the use of customers, especially the customers of automobile OEMs, but it is difficult for general hot-rolled strips to achieve a yield ratio lower than 0.76. In order to meet the needs of automobile manufacturers for low yield ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 关建东李明武军宽李树森
Owner BEIJING SHOUGANG CO LTD
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