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 relates to a steel bar and a processing method thereof, in particular to a high-strength spiral rib steel bar and a processing method thereof. Background technique [0002] At present, the commonly used reinforcing bar is threaded steel, specifically, the outer surface has a crescent-shaped ribbed thread, the thread is a longitudinal convex rib, and the transverse rib occludes teeth, and is discontinuous. The size of this kind of rebar is formulated according to the standards of Soviet construction steel in the 1950s and 1960s. The diameter of the steel bar is between 6 and 50 mm. It is widely used in the field of construction and has been used to this day. Since the base circle area ratio of the external dimensions of the rebar is 0.94, the effective area will lose about 6% to 11% because the transverse ribs cannot bear force. Because the surface of the steel bar has longitudinal ribs, the bonding force and grip force with the concrete ...

AI Technical Summary

Problems solved by technology

As its technology is limited by tooling equipment and engineering requirements, it can only produce steel bars up to 10mm, and cannot produce large-scale steel bars

[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

Images