Deformed steel bar used at low temperature and production process thereof

Abstract

The invention discloses a deformed steel bar used at a low temperature and production process thereof. Particularly, the deformed steel bar can be used at a low temperature, and comprises the following chemical components by weight percentage: 0.05-0.10 percent of C, 0.20-0.35 percent of Si, 1.45-1.60 percent of Mn, no more than 0.015 percent of S, no more than 0.008 percent of P, no more than 0.20 percent of Cr, 0.90-1.50 percent of Ni, no more than 0.20 percent of Cu, no more than 0.10 percent of Mo, no more than 0.0120 percent of N, 0.030-0.045 percent of Al, and Fe and unavoidable impurities in balancing amount. The production process of the deformed steel bar comprises the procedures of electric furnace smelting, refining furnace refining, vacuum furnace deaeration, and continuous casting and pouring. According to the invention, the components are reasonably designed, the production process and the operation process are easy to control; molten steel deoxygenation is good, the purity is good, the continuous casting and pouring is smooth, and the quality of surface of casting billet is better; the finished deformed steel bar has good quality and can satisfy low-temperature (no more than minus 1650 DEG C) use demand.

Description

technical field [0001] The invention relates to a threaded steel, in particular to a low-temperature threaded steel, and also relates to a production process of the low-temperature threaded steel. Background technique [0002] As we all know, low-carbon and low-alloy structural steel is widely used in raw material mining, energy development, transportation and other economic construction fields, and has become the most important structural material. These structural parts are subjected to complex and variable cyclic loads, and in some cases need to adapt to extremely cold climates, thus putting forward higher requirements for basic indicators such as structural steel yield strength and low temperature impact toughness, generally through composition, The improvement and innovation of rolling and heat treatment process, precise control of structure, so as to obtain higher strength and toughness, taking into account other performance requirements. [0003] As far as the applic...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent 201210578819.7 discloses a low-temperature steel and its production method. The product is added with precious metals such as Nb, Ni, Ti, and Cr at the same time. The process is complicated and the cost is high, but the low-temperature steel can only be used at -50°C; Chinese patent 200810035029.8 discloses a low-temperature steel and its manufacturing method, but the product has many components, and precious metals such as Nb, Ti, and Ni are added at the same time, the cost is high, and the service temperature is about -80°C; Chinese patent 200910075654.X discloses A ferritic steel for low temperature was developed. Although this product can be used in a low temperature environment of -196°C, the Ni added to this product is 6.5-12.5%, and the cost is very high

Images