HRB500E ordinary-speed hot-rolled ribbed steel bar with tensile-to-yield ratio greater than 1.28 and production method thereof

Abstract

The invention provides an HRB500E ordinary-speed hot-rolled ribbed steel bar with a tensile-to-yield ratio greater than 1.28 and a production method thereof. The production method of the HRB500E ordinary-speed hot-rolled ribbed steel bar with the tensile-to-yield ratio greater than 1.28 comprises the following process stages which are sequentially conducted: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF refining, square billet continuous casting and hot continuous rolling. The HRB500E ordinary-speed hot-rolled ribbed steel bar is prepared from the following components in percentage by weight: 0.19 to 0.25 percent of C, 0.60 to 0.80 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.040 percent of P, less than or equal to 0.035 percent of S, 0.065 to 0.10 percent of V, 0.010 to 0.022 percent of Nb, 0.008 to 0.020 percent of N, and 0.0020 to 0.0050 percent of B. The specification of the ordinary-speed hot-rolled ribbed steel bar is 10 mm to 40 mm. The cooling bed cooling mode is natural cooling. The HRB500E ordinary-speed hot-rolled ribbed steel bar with the tensile-to-yield ratio greater than 1.28 and the production method of the HRB500E ordinary-speed hot-rolled ribbed steel bar with the tensile-to-yield ratio greater than 1.28 are adopted.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a steel-moving mechanism in front of a steel plant kiln, in particular to a steel-moving mechanism between a billet conveying platform and a conveying roller table in the metallurgical industry, that is, a HRB500E general-speed heating mechanism with a strength-to-yield ratio greater than 1.28. Rolled ribbed steel bars and methods for their production. Background technique [0002] HRB500E seismic steel bar has high strength, good seismic performance, and wide application. GB / T 1499.2-2018 "Steel for Reinforced Concrete Part 2: Hot-rolled Ribbed Steel Bar" specifies the strength-to-yield ratio R of HRB500E seismic steel bar o m / R o eL It is required to be greater than or equal to 1.25, but the strength-to-yield ratio R often occurs in normal production o m / R o eL Cases below 1.25. . [0003] To sum up, there are the following problems in the prior art: the strength-to-yield r...

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Problems solved by technology

[0004] The present invention provides a HRB500E general-speed hot-rolled ribbed steel bar with a strength-to-yield ratio greater than 1.28 and its production method to solve the production of normal-speed rolled HRB500E seismic steel bars Frequently there is a problem that the flexion ratio Rom / RoeL is lower than 1.25

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