High-strength reinforcing steel bar with spiral fins and processing method of high-strength reinforcing steel bar

Abstract

The invention relates to a reinforcing steel bar and a processing method thereof, in particular to a high-strength reinforcing steel bar with spiral fins and a processing method of the high-strength reinforcing steel bar. The high-strength reinforcing steel bar consists of following components including, in weight percentage, from 0.25 to 0.4% of C, from 0.1 to 0.2% of Si, from 0.3 to 0.45% of Mn, from 0.04 to 0.05% of Nb, from 0.08 to 0.09% of Cr, from 0.01 to 0.04% of V, from 0.002 to 0.003% of B, from 0.001 to 0.003% of Mo, from 0.015 to 0.03 of Al, from 0.002 to 0.003% of S, from 0.008 to0.009% of Ti, from 0.004 to 0.005% of Ni, from 3 to 5% of composite rear earth and the balance Fe. The processing method includes using a roll to roll a reinforcing steel bar into a reinforcing steelbar with the continuous spiral fins on the surface in a hot state; feeding the reinforcing steel bar with the continuous spiral fins on the surface after hot rolling into a heating furnace and heating the reinforcing steel bar to the temperature of 880-990 DEG C; then fast cooling the reinforcing steel bar to the temperature of 650-680 DEG C by an online cooling device via compressed air or vaporous quenching liquid; quenching in a quenching device by water or quenching liquid for 15-25 seconds; and tempering after heating the reinforcing steel bar to the temperature of 500-550 DEG C via a tempering heating furnace. The high-strength reinforcing steel bar with the spiral fins has a good anchoring property, fine ductility and a high yielding-to-tensile ratio.

Description

Technical field [0001] The invention involves a steel bar and its processing method. Specifically, it is a high -strength spiral rib steel and its processing method. Background technique [0002] The currently used steel bars are threads, which are specific on the outer surface with crescent rib threads, threads are longitudinal convex tendons, cross -rib bite teeth, and are not continuous.The size of this thread is formulated in accordance with the standards of Soviet -building steel in the 1950s and 1960s. The diameter of the steel bar is between 6 and 50mm. It is widely used in the construction field and has been used to this day.Because the base of the thread size is 0.94, the effective area should be lost by about 6%to 11%due to the force of the horizontal ribs.Due to the surface of the reinforcement with longitudinal convex tendons, the adhesion and grip of the concrete in the reinforced concrete engineering are weak, and the reinforced concrete is in a state of force. Due ...

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Problems solved by technology

[0006] In addition, the existing process and the spiral-rib steel wire produced by it have the following disadvantages: due to the first drawing to increase the strength, and then the quenching and tempering treatment, the ductility of the spiral-rib steel wire is poor and the strength-to-yield ratio is low; The strength is increased by drawing, resulting in a low yield; the molds are often changed, resulting in high production costs; the size is too small, resulting in a narrow range of use; a large amount of waste acid produced in the pickling and phosphating process cannot be effectively treated, seriously Environmental pollution; multiple high-power wire drawing machines are used for continuous drawing, which also seriously wastes limited power resources

[0007] Due to the defect of the spiral rib shape of the spiral rib steel wire itself, another disadvantage is that the nuts cannot be tightened between any two spiral rib steel wires, that is, the two spiral rib steel wires cannot be screwed through the nuts. Connecting through anchors increases the connection cost; and the existing rebar can do the above, which is one of the advantages of rebar

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