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Hot-rolled round steel for automobile door hinge and production method thereof
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A production method and door hinge technology, applied in the field of alloy steel, can solve the problems of low cutting performance and low elongation after breaking
Inactive Publication Date: 2021-06-08
JIANGSU YONGGANG GROUP CO LTD
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Problems solved by technology
Existing automobile door hinges belong to low-alloy high-strength steel, which has the disadvantages of low machinability, tensile strength, yield strength, impact energy, and low elongation after fracture.
Method used
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Embodiment 1
[0081] Through electric furnace steelmaking, LF refining, VD vacuum treatment, continuous casting, slow cooling, heating, rolling, and pit cooling processes, φ85mm hot-rolled round steel is obtained, which contains the following chemical components in mass percentage (unit, wt%): C : 0.17%, Si: 0.42%, Mn: 1.44%, P: 0.0136%, S: 0.0153%, Cr: 0.14%, V: 0.036%, H: 1.3ppm, O: 14.3ppm, N: 32.7ppm, others For Fe and residual elements.
Embodiment 2
[0083] Through electric furnace steelmaking, LF refining, VD vacuum treatment, continuous casting, slow cooling, heating, rolling, and pit cooling processes, φ85mm hot-rolled round steel is obtained, which contains the following chemical components in mass percentage (unit, wt%): C : 0.173%, Si: 0.42%, Mn: 1.43%, P: 0.007%, S: 0.016%, Cr: 0.13%, V: 0.04%, H: 1.1ppm, O: 15.3ppm, N: 33.5ppm, others For Fe and residual elements.
Embodiment 3
[0085] Through electric furnace steelmaking, LF refining, VD vacuum treatment, continuous casting, slow cooling, heating, rolling, and pit cooling processes, φ85mm hot-rolled round steel is obtained, which contains the following chemical components in mass percentage (unit, wt%): C : 0.172%, Si: 0.40%, Mn: 1.47%, P: 0.012%, S: 0.015%, Cr: 0.17%, V: 0.033%, H: 1.1ppm, O: 28.5ppm, N: 30.3ppm, others For Fe and residual elements.
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Abstract
The invention discloses hot-rolled round steel for an automobile door hinge and a production method thereof. The hot-rolled round steel for the automobile door hinge comprises the following components in percentage by mass: 0.17-0.19% of C; 0.38%-0.48% of Si; 1.37-1.47% of Mn; less than or equal to 0.020% of P; 0.01-0.02% of S; 0.10-0.20% of Cr; 0.03-0.05% of V; 0.015-0.025% of Al; less than or equal to 1.5 ppm of H; less than or equal to 25 ppm of O; less than or equal to 80 ppm of N; and the balance Fe and residual elements. According to the embodiment of the invention, the hot-rolled round steel for the automobile door hinge has excellent tensile strength, yield strength, impact energy, percentage elongation after fracture and the like.
Description
technical field [0001] The invention belongs to the technical field of alloy steel, and in particular relates to a hot-rolled round steel for automobile door hinges and a production method thereof. Background technique [0002] As the foundation of the automobile industry, auto parts are a necessary factor to support the sustainable and healthy development of the automobile industry. Among them, the hinge steel for automobile doors is used in the connecting device between the automobile body and the door, which can play a similar role as a hinge. The existing automobile door hinge belongs to low-alloy high-strength steel, which has the disadvantages of low machinability, tensile strength, yield strength, impact energy, and low elongation after breaking. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems existing in the prior art. [0004] Therefore, the present invention proposes a hot-rolled round bar for automo...
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