Iron alloy additive containing low titanium and phosphorus and use method of iron alloy additive

Abstract

The invention discloses an iron alloy additive containing low titanium and phosphorus and a preparation method of the iron alloy additive. The iron alloy additive is specially designed for production of high-grade non-oriented and oriented silicon steel. The special iron alloy additive containing low titanium and phosphorus comprises 21%-25% of P, 0-0.08% of Cr, 0-3.0% of Si, 0-0.8% of C, 0-0.04% of S, 0-2.0% of Mn, 0-0.05% of Ti, 0-0.2% of V, 0-0.2% of Nb and 0-5% of screen underflow. The iron alloy additive containing low titanium and phosphorus has the characteristics of rich elements, lower content and moderate granularity, the impurity content in the steelmaking process can be effectively controlled, and particularly, the iron alloy additive has important function on enhancing steel strength and hardness during high-grade silicon steel production.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy production, and in particular relates to a low-titanium phosphorus ferroalloy additive used in the smelting and reduction process of special steel and its application method. Background technique [0002] Silicon steel is known as the "handicraft" in steel products. It has the characteristics of small iron loss, low coercive force, high magnetic permeability and magnetic induction, and is widely used in electronic power industry and military industry. Silicon steel sheet is divided into oriented silicon steel and non-oriented silicon steel. In terms of chemical composition control, the methods are different. Oriented silicon steel has extremely strict requirements on the content of conventional elements, and at the same time, it is necessary to strictly control the beneficial inclusion elements added to obtain grain orientation. High, directional high magnetic induction, low iron loss grain-ori...

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Problems solved by technology

At present, there are two ways to produce ferrophosphorus: one is to produce ferrophosphorus mainly, and phosphorus is a by-product; the other is to produce yellow phosphorus mainly, and ferrophosphorus is a byproduct. Most of the foreign countries produce in this way, so The capacity of the electric furnace used is 10,000KV·A, and most of the ferrophosphorus in my country has been produced by the first method, but the cost is relatively high; there are also manufacturers that produce the by-product ferrophosphorus by the second method, but the output of each furnace is low and contains phosphorus. The amount fluctuates greatly, the slag inclusion is difficult to adjust, the impurity content is high, and it is difficult to meet the requirements of high-grade silicon steel smelting

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