Ribbed rebar wire rod made of ultra-fine grained steel and production process of ribbed rebar wire rod

Abstract

The invention relates to a ribbed rebar wire rod made of ultra-fine grained steel and a production process of the ribbed rebar wire rod. The ribbed rebar wire rod comprises the following chemical components in percentage by weight: 0.21-0.24% of C, 0.60-1.30% of Mn, 0.15-0.50% of Si, no less than 0.035% of P, no less than 0.035% of S, and the balance of iron and inevitable impurities. According to the production process, a whole-process low-temperature controlled rolling method is adopted; the spinning temperature is controlled to be 650-720 DEG C; the intake pressure of a pinch roll is adjusted to be 7.0-8.0 bar; the clamping force of the pinch roll is adjusted to be 5.0-7.0 bar; and the ribbed rebar wire rod made of ultra-fine grained steel is produced by adopting a TMCP (thermos-mechanical control process) method. The ribbed rebar wire rod produced according to the TMCP method is uniform in grain refinement, low in oxidation burning loss, lower in energy consumption and raw material consumption, and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an ultrafine-grain steel ribbed wire rod and a production process thereof. Background technique [0002] The front pinch roller of the laying head is the key equipment of the high-speed wire rod production line in the metallurgical industry. It is responsible for the important function of smoothly introducing the finished wire rod from the rolling mill to the laying head; this device is mainly used for small-sized tail brakes when producing round steel wire rods. and large format pinch delivery. [0003] When producing ribbed steel bar wire rod under the condition of high temperature not lower than 750℃, the temperature drop after rolling is not large, the water penetration is small, so the water penetration resistance is small, and the conventional pinch technology can realize stable production; but in When producing ribbed steel bar wire rod under the condition ...

AI Technical Summary

Problems solved by technology

[0003] When producing ribbed steel bar wire rod under the condition of high temperature not lower than 750℃, the temperature drop after rolling is not large, the water penetration is small, so the water penetration resistance is small, and the conventional pinch technology can realize stable production; but in When producing ribbed steel bar wire rod under the condition of low temperature spinning process of less than 720 ℃, due to the large temperature drop after rolling and the large amount of water penetration, the water penetration resistance is large, and the conventional pinch technology cannot provide enough power to offset the water penetration Resistance, so that normal production cannot be achieved

[0004] It is for the above reasons that the current production of ribbed steel wire rods at home and abroad adopts high-temperature spinning technology with a spinning temperature higher than 750°C, which leads to: it is impossible to use ordinary carbon without adding any microalloying elements Nb, V, Ti For the production of 400MPa and 500 MPa ribbed steel bars, it is impossible to use ordinary carbon steel without adding any microalloying elements Nb, V, Ti to produce 460 MPa British standard ribbed steel bars and other similar products, only by adding microalloying elements Nb, V, Ti or adding Mn, Si strengthening elements to increase the strength to achieve the production of high-strength steel bars such as 400MPa, 500 Mpa ribbed steel bars and 460 MPa British standard threaded steel bars; and the addition of microalloying elements Nb, V, Ti or adding Mn, Si strengthening elements to increase the strength of the steel bar, complicate the production process and increase the cost of the steel bar

[0005] In foreign countries, countries such as Europe and the United States mainly adopt the waste heat quenching process after rolling to improve the strength of steel; the products produced by this process have lower plasticity, poorer welding performance, and lower strength-to-yield ratio than alloy-strengthened products; in my country, this type of steel is mainly used for construction. , due to the poor welding performance of the steel produced by the waste heat quenching process, only mechanical connections can be used during construction. However, my country is in an earthquake-prone area, and most of the steel bars in engineering construction use welding connection technology. Therefore, products produced by waste heat quenching technology are difficult in Promotion and application in my country