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Oxide layer adhesion-tight hot-rolled black-skin surface steel sheet and its manufacturing method

A manufacturing method and oxide layer technology, applied in the field of hot-rolled steel plates, can solve problems affecting production efficiency, etc., and achieve the effects of improving service life, saving energy, and huge economic benefits

Active Publication Date: 2007-06-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent needs to wait for a period of time after rough rolling and descaling, which will inevitably affect production efficiency

Method used

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  • Oxide layer adhesion-tight hot-rolled black-skin surface steel sheet and its manufacturing method

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Embodiment Construction

[0029] Below by embodiment the present invention will be further described. Firstly, steel grades are designed according to the composition scope of the present invention. The embodiment of the present invention provides 8 steel grade compositions, and the specific compositions are shown in Table 1. Then the steel billets with different components are heated, kept warm, rough rolled, descaled, finished rolled, cooled and coiled according to the prescribed rolling system. The present invention provides 14 embodiments of rolling systems, see Table 2 for details. See Table 3 for the steel plate performance and oxide layer conditions corresponding to each embodiment. As can be seen from Table 3, the mechanical properties of the steel plate of the embodiment of the present invention fully meet the requirements of the steel plate supply performance standard, and the thickness of the surface oxide layer and the Fe 3 o 4 content met the design requirements. For those that need to ...

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Abstract

The invention supplies hot rolling black skin surface steel plate with oxide layer adhered and manufacturing method. Its components are 0.01-0.30wt% C, not more than 1.0wt% Si, 0.10-1.80wt% Mn, not more than 0.1wt% P and 0.1% S, and 0.1% Al, rest iron and unavoidable impurity. The average thickness of the steel plate surface oxide layer is less than 10mum. And its Fe3O4 content is more than 90%. Its manufacturing method includes the following steps: heating casting blank to 1200-1270 degree centigrade; preserving heat for 2-5 hours; rough rolling; using more than 10MPa high pressure water de-scaling for two to six times; finish rolling beginning at 900-1100 degree centigrade, finishing at 800-950 degree centigrade; cooling at the speed of 8-30 degree centigrade per second; coiling at 450-650 degree centigrade. The invention has the advantages of environmental protection, saving energy sources, improving press die useful life, great economic and social benefits.

Description

technical field [0001] The invention relates to a hot-rolled steel plate, in particular to a hot-rolled black-skinned steel plate with a firmly bonded surface oxide layer and a manufacturing method thereof. Background technique [0002] The rust produced on the surface of hot-rolled steel plate after hot rolling is composed of Fe 3 o 4 , Fe 2 o 3 It is composed of FeO and generally needs to be removed by pickling. However, with the demand for environmental protection and energy saving, automobile manufacturers require steel mills to provide pickling-free steel plates that can be directly stamped, which puts forward higher requirements for the surface quality of steel plates. Automobile manufacturers use ordinary hot-rolled steel plates to directly stamp parts such as automobile beams without pickling, and the oxide scales will fall off or become dust, causing environmental pollution and affecting the service life of stamping dies, which is uneconomical and seriously affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B37/74C23F11/00
Inventor 时晓光董恩龙徐世帅武裕民刘利群关菊张紫茵王锐
Owner ANGANG STEEL CO LTD
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