Thin SAPH 440 strip steel and production method thereof

A production method and thin-gauge technology, applied in the field of metallurgy, can solve problems such as failure to meet standard requirements, high steelmaking control level requirements, and fluctuations in mechanical properties, achieving good plasticity, low heat storage capacity, and avoiding thermal stress concentration. Effect

Active Publication Date: 2020-11-24
HANDAN IRON & STEEL GROUP +1
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Problems solved by technology

However, this method requires a high level of steelmaking control. When the content of impurity element nitrogen in molten steel fluctuates greatly, its mechanical properties also fluctuate correspondingly, and it cannot even meet the standard requirements.

Method used

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  • Thin SAPH 440 strip steel and production method thereof
  • Thin SAPH 440 strip steel and production method thereof
  • Thin SAPH 440 strip steel and production method thereof

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Embodiment 1-13

[0029] A method for producing thin-gauge SAPH440 strip steel, the technological process of which mainly includes molten iron pretreatment, converter steelmaking, LF refining, slab continuous casting, heating, rough rolling, finishing rolling, laminar cooling, coiling, slow cooling, Smoothing, pickling and other processes.

[0030] During the tapping process of the converter steelmaking process, aluminum alloy is added for pre-deoxidation, and manganese alloy is added at the same time to form high-temperature stable manganese sulfide. In the LF refining process, aluminum alloy is added for deep deoxidation, and the acid-soluble aluminum in the molten steel is controlled at 0.02-0.05%. At this time, the acid-soluble aluminum in the molten steel mainly exists in the form of aluminum nitride and aluminum sulfide. Then, titanium alloy is added to adjust the Ti content in the molten steel to 0.005-0.01%, and the nitrogen in the aluminum nitride and the elemental nitrogen in the molt...

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Abstract

The invention relates to thin SAPH 440 strip steel and a production method thereof, and belongs to the technical field of metallurgy. The strip steel comprises the following chemical components: by mass, C: 0.05-0.10%, Si <= 0.12%, Mn: 1.0-1.2%, P <= 0.020%, S <= 0.020%, Als: 0.02-0.05%, Ti: 0.005-0.015%, B: 0.001-0.002%, N <= 0.0045%, and the balance Fe and inevitable impurities. The production method comprises the steps of molten iron pretreatment, converter steelmaking, LF refining, slab continuous casting, hot rolling, cooling, leveling and pickling; and in the hot rolling process, finishrolling temperature is 870-930 DEG C, and laminar flow cooling adopts a latter 1/4 section cooling mode. Through microalloy component design and the matching hot rolling process, the finished strip steel is good in plasticity and small in strength performance fluctuation.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a thin gauge SAPH440 strip steel and a production method thereof. Background technique [0002] With the increasingly fierce competition in the automobile industry, the need for automobile manufacturers to reduce costs is also increasing. Among the raw materials for automobile production, various steel materials account for about 70% of the total weight of the automobile, and the sheet metal accounts for about 50% of the total weight of the automobile. SAPH440 steel is mainly used for parts that have certain strength requirements, such as automobile floors, bottom beams, and supporting structures, and need to be formed by stamping a certain depth. Therefore, SAPH440 steel is required to achieve a certain strength and elongation at the same time. At present, the standard widely used or quoted by various manufacturers is the Japanese standard JIS G 3113. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/14C22C38/002C22C38/001C22C33/04C21D8/0205C21D8/0226C21D8/0263Y02P10/20
Inventor 杨建宽苏振军曹晓恩孔加维韩闯闯姚政洪运涛倪蒙
Owner HANDAN IRON & STEEL GROUP
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