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High-toughness hot-rolled 530 MPa-grade automobile cold stamping bridge shell steel plate and manufacturing method thereof

A manufacturing method and 530mpa technology, applied in the field of automobile axle housing steel plate manufacturing, can solve the problems of increasing product safety hazards and performance fluctuations, and achieve the effects of excellent ductility, moderate strength, good weldability and ductility

Active Publication Date: 2019-08-02
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, changes in the internal structure of the steel plate after thermal processing cause performance fluctuations, which increase product safety hazards to a certain extent

Method used

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  • High-toughness hot-rolled 530 MPa-grade automobile cold stamping bridge shell steel plate and manufacturing method thereof
  • High-toughness hot-rolled 530 MPa-grade automobile cold stamping bridge shell steel plate and manufacturing method thereof
  • High-toughness hot-rolled 530 MPa-grade automobile cold stamping bridge shell steel plate and manufacturing method thereof

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Embodiment Construction

[0028] It should be noted that, as used herein, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or system comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or system. Without further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system comprising that element.

[0029] The serial numbers of the following embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0030] In this document, the use of the words first, second, and third etc. does not indicate any order. These words can be interpreted as names.

[0031] It should be understood that the specific embodime...

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Abstract

The invention discloses a high-toughness hot-rolled 530 MPa-grade automobile cold stamping bridge shell steel plate and a manufacturing method thereof. The high-toughness hot-rolled 530 MPa-grade automobile cold stamping bridge shell steel plate comprises the following components of C, S, Mn, P, S, Al, Nb, Ti and the balance Fe and impurities; the content of the elements has to meet the followingrelationship at the same time, Nb+Ti is greater than or equal to 0.025% and is less than or equal to 0.045%, CEV is equal to C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15 and is less than or equal to 0.45%; the manufacturing method is characterized in that V is not added to the component design, Mn content is properly adjusted, a certain amount of Si, Nb, Ti and the like are added, molten iron pretreatment, molten steel smelting, continuous casting, cooling, heating, rolling, cooling, finishing, inspection and the like are carried out, so that the surface quality and strength of the steel meet the cold stamping and welding processing processes of the bridge shell steel; the yield strength ReL of the steel plate is greater than or equal to 375 MPa, the tensile strength Rm is greater than or equal to 530 MPa, the elongation percentage A after fracture is greater than or equal to 26%, the impact power KV2 at 0 DEG C is greater than or equal to 180 J, the grain size is 8-10 grades, the strip-shaped gradeis 1-3 grades, and cold stamping and forming of 10-16 mm specifications can be realized.

Description

technical field [0001] The invention relates to the technical field of manufacturing automobile axle housing steel plates, in particular to a high-toughness hot-rolled 530MPa grade automotive cold-stamped axle housing steel plate and a manufacturing method thereof. Background technique [0002] The automobile axle is one of the key parts of the automobile. It is not only a part of the transmission system, but also an important part of the driving system. As the main part of the axle, the automobile axle housing is a key component to ensure the normal operation and service life of the automobile, so it has high requirements for its mechanical strength, toughness and fatigue resistance. The production cost of the axle housing accounts for about 30% of the total cost of the drive axle. Especially when heavy-duty vehicles are working due to harsh roads and working conditions, the axle housing is subjected to strong impact loads, and the quality requirements for the axle housing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 张欢王孝东余宏伟鲍海燕梁宝珠易勋杨波严敏
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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