Low-carbon steel wire rod and manufacturing method thereof

Abstract

The invention discloses a low-carbon steel wire rod and a manufacturing method thereof. Key points of chemical components and rolling processes of the low-carbon steel wire rod are designed, by optimizing the chemical components of the wire rod, calculation is carried out in percentage by weight, elementary components are controlled that 0.06-0.30% of C, less than or equal to 0.18% of Si, 0.15-0.80% of Mn, less than or equal to 0.007% of N, and less than or equal to 0.004% of O, arbitrary one or two of Cr, Ti and B are added at the same time, when the single element Cr is added or the added two elements comprise Cr and when the single element Ti or B is added or Ti and B are added at the same time, manganese content is adjusted and controlled according to carbon content, when B is added, contents of B and N are required to be controlled, when the C content is 0.06-0.12%, B / N is ensured to be 0.4-1.8; when the C content is 0.12-0.30%, B / N is ensured to be 0.4-0.9. When rolling is carried out, the initial rolling temperature is controlled to be 900-930 DEG C, the spinning temperature is 900-920 DEG C, the roller bed speed is controlled to be 0.2-0.6m / s, front 0-6 draught fans are started, the aperture of an optitflex is adjusted to 40%, and heat preservation covers are all started.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a low-carbon steel wire rod and a manufacturing method thereof. Background technique [0002] Low carbon steel wire rod is one of the most widely used products in production and construction. It is used to draw steel wires of different specifications, and then make different steel wire products, standard parts and various non-standard parts. Depending on the requirements, the requirements for the composition, strength, surface shrinkage and other indicators of the wire rod are also different. Generally, low carbon steel wire rods have to go through the wire drawing process, and the drawing process is relatively strict on the ferrite grain size, decarburization layer, inclusions, uniformity of structure, and scale structure and thickness of the wire rod. requirements, but low-carbon steel wire rods have the characteristics of high waste return during the production process, a...

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Problems solved by technology

Generally, low carbon steel wire rods have to go through the wire drawing process, and the drawing process is relatively strict on the ferrite grain size, decarburization layer, inclusions, uniformity of structure, and scale structure and thickness of the wire rod. requirements, but low-carbon steel wire rods have the characteristics of high waste return during the production process, and different customers have different requirements for the use of low-carbon steel wire rods. The existing low-carbon steel wire rods cannot meet the changing needs of customers. , while the qualified rate of products in the production process is relatively low

Most low-carbon steel wire rods usually only contain carbon silicon manganese elements, or add a small amount of boron, but during production, due to the limitation of deoxidizing elements, the deoxidation is not sufficient, and it is easy to cause shrinkage cavities and surface defects. Grinding is used to improve the surface quality of the billet, which is time-consuming and labor-intensive, and the cost is high

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