Method for controlling fluctuation of same-circle yield strength of HRB400E wire rod twisted steel and HRB400E wire rod twisted steel

Abstract

The invention provides a method for controlling the fluctuation of the same-circle yield strength of HRB400E wire rod twisted steel and the HRB400E wire rod twisted steel with small fluctuation difference of the same-circle yield strength. The method for control the fluctuation of the same-circle yield strength of the HRB400E wire rod twisted steel comprises the following steps that A, component control in a smelting stage is carried out; B, after smelting, controlled cooling equipment is used before finish rolling for controlling the finish rolling inlet temperature; and C, after finish rolling, the controlled cooling equipment is used for reducing the laying temperature, and the laying temperature is controlled to range from 765 DEG C to 865 DEG C. The HRB400E wire rod twisted steel withthe small fluctuation difference of the same-circle yield strength comprises the components of, in percentage by weight, 0.19 wt% - 0.25 wt% of C, 0.60 wt% - 0.75 wt% of Si, 1.10 wt% - 1.25 wt% of Mn, less than or equal to 0.040 wt% of P, less than or equal to 0.035 wt% of S, less than or equal to 0.035 wt% of S, 0.008 wt% - 0.020 wt% of V, and less than or equal to 0.10 wt% of Cr. According to the method for controlling the fluctuation of the same-circle yield strength of the HRB400E wire rod twisted steel, the fluctuation of the same-circle yield strength is controlled within 40 MPa.

Description

technical field [0001] The present invention relates to the field of metallurgy, in particular to a method for controlling yield strength fluctuations of HRB400E wire rod threaded steel bars in the same circle and HRB400E wire rod threaded steel bars with smaller yield strength fluctuations in the same circle, especially a HRB400E coil with a specification of Φ6-12mm The control method of yield strength fluctuation in the same circle of threaded steel bar (hereinafter referred to as HRB400E wire rod) and the HRB400E wire rod threaded steel bar with small difference in yield strength fluctuation in the same circle. Background technique [0002] HRB400E wire rod rebar is produced by a high-speed wire rod production line. After spinning, it is transported backward on the Stelmore roller table, and the wire rod is controlled by adjusting the Jialing device of the Stelmore roller table, the opening of the fan, and the speed of the roller table. Cooling strength and uniformity aft...

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Problems solved by technology

[0004] The present invention provides a method for controlling the yield strength fluctuation of HRB400E wire rod threaded steel bars in the same circle, and HRB400E wire rod threaded steel bars with smaller yield strength fluctuation difference in the same circle, so as to solve the problem of larger yield strength fluctuations in the same circle of HRB400E wire rod threaded steel bars question

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