Cold heading steel, ladle furnace refining process of cold heading steel and production process of cold heading steel

Abstract

The present invention provides a cold heading steel, a cold heading steel ladle furnace refining process and a cold heading steel production process. The cold heading steel comprises the following chemical components by weight: 0.19-0.22% of C, less than or equal to 0.10% of Si, 0.75-0.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.030% of S, more than or equal to 0.02% of AlT, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.20% of Cu, and the balance of Fe. According to the present invention, in the cold heading steel production process, application of aluminum to carry out deep deoxidation, silicon calcium wire feeding, immersion type nozzle application and other steps are adopted, such that the internal components of the produced cold heading steel are reasonably matched, and especially the combination of the C with the content of 0.19-0.22% and the Si with the content of less than or equal to 0.10% makes the cold heading steel meet strength, toughness and other comprehensive mechanical properties, such that the workability of the cold heading steel at a room temperature is good.

Description

technical field [0001] The invention relates to a cold heading steel, a ladle furnace refining process and a production process of the cold heading steel, and belongs to the technical field of iron and steel smelting. Background technique [0002] Cold heading steels are generally low and medium carbon high-quality carbon structural steels and high-quality alloy structural steels, which are used for cold heading forming various mechanical standard parts and fasteners. Cold heading steel metal has good plasticity, and is mostly used to produce standard parts with high interchangeability, such as bolts, nuts, screws, rivets, self-tapping screws and other fasteners and cold heading forming parts. With the extensive use of fasteners, the market demand for cold heading steel continues to increase. The current demand for cold heading steel in my country alone has reached more than 10 million tons. [0003] The key to cold heading steel smelting is to improve the purity of molten ...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is to overcome the technical defect that the cold heading steel produced by electric furnace smelting in the prior art cannot meet the normal temperature processing performance and mechanical performance at the same time, so as to provide a kind of steel that can meet the normal temperature processing performance and mechanical performance at the same time. cold heading steel

[0006] Another technical problem to be solved by the present invention is to overcome the technical defect that the cold heading steel produced by electric furnace smelting cannot meet the normal temperature processing performance and mechanical performance at the same time in the prior art, so as to provide a method that can match the electric furnace smelting process, and then The ladle furnace refining process of cold heading steel to improve the normal temperature processability and mechanical performance of cold heading steel through the regulation of process and composition

[0007] Another technical problem to be solved by the present invention is to overcome the technical defect that the cold heading steel produced by electric furnace smelting in the prior art cannot meet the normal temperature processability and mechanical performance at the same time, so as to provide a method that can match the electric furnace smelting process, and then The production process of cold heading steel to improve the normal temperature processability and mechanical performance of cold heading steel through the regulation of process and composition