Continuous casting pipe blank and preparation method and application thereof

By optimizing the chemical composition and continuous casting process parameters of continuous casting tube blanks, the problems of high strength, high toughness and low segregation are solved, and the preparation of high-quality continuous casting tube blanks is realized, which is suitable for the field of engineering machinery.

CN120425271APending Publication Date: 2025-08-05CHENGDE JIANLONG SPECIAL STEEL
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Patent Information

Application Number
CN202510641986.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-19
Publication Date
2025-08-05

AI Technical Summary

Technical Problem

The prior art is difficult to provide continuous casting tube blanks with high strength, high toughness and less cross-sectional composition segregation, and the preparation method is complicated and is not suitable for large-scale production.

Method used

By optimizing the chemical composition of the continuous casting tube blank, especially the element contents such as C, Mn, Cr, etc., and adding a specific amount of V, Nb and W, combined with appropriate continuous casting process parameters, such as pulling speed and electromagnetic stirring, a continuous casting tube blank with high strength, high toughness and uniform composition is prepared.

Benefits of technology

The tensile strength of continuous casting tube billet is achieved up to 990MPa or more, the yield strength is above 905MPa or more, the impact work of -20℃ is above 57J, and the cross-section carbon segregation difference is as low as 0.030%. It meets the requirements of steel for construction machinery, and the preparation method is simple and low cost, which is suitable for large-scale production.

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Abstract

The invention provides a continuous casting pipe blank as well as a preparation method and application thereof. The continuous casting pipe blank comprises the following components: 0.14 to 0.18 weight percent of C, 1.25 to 1.45 weight percent of Mn, 0.65 to 0.75 weight percent of Cr, 0.35 to 0.40 weight percent of Mo, 0.10 to 0.20 weight percent of Ni, 0.04 to 0.07 weight percent of V, 0.035 to 0.055 weight percent of Nb, 0.50 to 0.70 weight percent of W, 0.02 to 0.05 weight percent of Al, less than or equal to 0.20 weight percent of Cu, less than or equal to 0.05 weight percent of Ti, 0.25 to 0.45 weight percent of Si, less than or equal to 0.015 weight percent of N, less than or equal to 0.015 weight percent of P, less than or equal to 0.01 weight percent of S and the balance of Fe. The tensile strength of the continuous casting pipe blank is preferably as high as 990MPa or above, the yield strength is preferably as high as 905MPa or above, the impact energy at-20 DEG C is preferably as high as 57J or above, the cross section carbon segregation range is preferably as low as 0.030% or below, the high-quality requirement of steel for engineering machinery is met, and the preparation method is simple in procedure, controllable in condition, low in cost and suitable for large-scale mass production.
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Citation Information

Patent Citations

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  • A pipeline steel and its preparation method and application

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