Low-temperature steel forging produced by using continuous casting billet and manufacturing method thereof

Abstract

The invention discloses a low-temperature steel forging produced by using a continuous casting billet. The low-temperature steel forging comprises the following chemical components: 0.16-0.20% of C, 1.40-1.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.20-0.60% of Si, less than or equal to 0.15% of Cu, 0.30-0.40% of Ni and the balance of iron. The invention further discloses a manufacturing method of the low-temperature steel forging produced by using the continuous casting billet. The method comprises the following steps: preparing the continuous casting billet, wherein raw materials are continuously cast into the continuous casting billet containing the above components; performing forging, wherein the obtained continuous casting billet is converted into the low-temperature steel forging by repeated upsetting and drawing forging; carrying out heat treatment, wherein the resulted forging is sequentially quenched and tempered, insulated, and cooled in a liquid medium after insulation; and obtaining the finished product. By this way, the chemical components are precisely controlled, so that the content of the chemical components powerfully guarantees the performance required. The repeated upsetting and drawing forging process is adopted, so that the looseness and dendritic crystal gaps of the forging are effectively eliminated, the forging structure is compact, and small flaws can be avoided by forging.

Description

technical field [0001] The invention relates to the technical field of low-temperature steel forging, in particular to a low-temperature steel forging produced by using continuous casting slabs and a manufacturing method thereof. Background technique [0002] Low-temperature steel refers to the steel used in low-temperature environments. With the continuous development of science and technology and the large-scale and large-scale petrochemical equipment, the amount of low-temperature steel will continue to increase, which breeds unlimited business opportunities. The low-temperature steel manufactured by our company is mainly the material in NB / T47009, such as 16MnD and other materials. Due to the harsh environment of low-temperature steel, the low-temperature performance of the material is high, especially the low-temperature impact performance, which is also a difficulty in the manufacture of low-temperature steel forgings. [0003] Usually, the traditional process of manu...

AI Technical Summary

Problems solved by technology

The continuous casting billet material has the advantages of high utilization rate, low price, and easy procurement, but the disadvantages are that there are many impurities in the material, many internal defects, and the billet has a central hole, etc.