A bridge steel with excellent toughness and strong fatigue at extreme low temperature and its manufacturing method

A technology of extreme low temperature and manufacturing method, applied in the field of steel smelting, can solve the problems of insufficient low temperature toughness and insufficient fatigue resistance, and achieve the effects of high strength, excellent toughness, improved use safety, and short process flow.

CN111676425BActive Publication Date: 2021-11-02WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-11-02

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Abstract

The invention discloses a bridge steel with excellent toughness and strong fatigue at extreme low temperature and a manufacturing method thereof. The components of the bridge steel include C, Si, Mn, P, S, Nb, Cu, Cr, N, Al and Re , and Cu, Cr and Ni satisfy: Cu+Cr+Ni≤2.91, the balance is Fe and unavoidable impurity elements; the technical solution provided by the invention, through the design of high Mn and high Si element content, high Mn increases the yield of steel Strength and tensile strength, high Si improves the fatigue strength of steel, and through the mixed addition of Cu, Cr and Ni, it can enhance the rust protection performance of steel, improve the corrosion resistance of steel, inhibit local corrosion, and add rare earth element Re Improve the fatigue performance and low-temperature toughness of the steel grade, so that it is suitable for the northern arctic regions where the ambient temperature is required to reach -80°C and above, which can ensure a safe service life and improve the safety of use.
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Description

technical field

[0001] The invention relates to the technical field of steel smelting, in particular to a method for manufacturing bridge steel with excellent toughness and strong fatigue resistance at extreme low temperatures. Background technique

[0002] With the development of the country's economic construction, large bridges are developing rapidly in the direction of large spans and heavy loads, and the application proportion of steel structure bridges is increasing. The span of railway bridges has been increased from 128m to 1092m, and the strength grade of steel grades has been increased from 235MPa to 690MPa. With the increase of bridge spans, the research and development of high-performance bridge steels has become extremely urgent. While increasing the strength, the service life and safety of steel structure bridges are becoming more and more important, which is the primary factor considered by designers. When steel structure bridges are subjected to dynamic load...

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Embodiment Construction

[0039] 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.

[0040] 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.

[0041] 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.

[0042] It should be understood that the specific embodime...