Method for producing continuous casting alloy steel containing S and Al

Abstract

The production method of S and Al contained continuous casting alloy steel adopts four-step technological process: (1). smelting steel by using D.C. electric furnace; at the time of tapping (1640-1660 deg.C) adding proper quantity of SiAlFe deoxidant, carbon powder, alloy and slag material; (2) refining by using LF furnace, (a). adding lime (CaO is greater than or equal to 90%), SiFe and C powderin batches, making white slag and bottom blowing argon; (b). for boron-containing steel feeding Ti and retaining B, (c). top slag alkalinity is 2.8, Al2O3 content in the slag is 25%, regulating Al and S; (3) vacuum furnace treatment, its vacuum degree is less than or equal to 140 Pa, and treatment time is 20 min.; and (4) continuous pouring, its pouring speed is 320 kg / min.

Description

technical field

[0001] The invention relates to a method for producing alloy steel in the metallurgical industry, in particular to a method for smelting and casting S and Al alloy steel. Background technique

[0002] According to the different casting forms of high temperature molten steel, it can be divided into two types: mold casting and continuous casting. Die casting is to pour high-temperature molten steel into steel ingots, which are opened into billets by a roughing mill (or forging press), and the metal yield is low (about 84%); continuous casting is to pour high-temperature molten steel directly into billets, and the metal yield is low. Higher (about 98%). Therefore, the use of continuous casting technology to produce alloy steel can not only greatly increase the metal yield and reduce production costs, but also the development direction of contemporary metallurgical technology.

[0003] As we all know: S element in steel is easy to produce sulfide inclusions, wh...