Industrial ultra-pure iron and production method thereof

Abstract

The invention belongs to the technical field of metal smelting, and particularly relates to industrial ultra-pure iron and a production method thereof. The industrial ultra-pure iron comprises the following components of, less than or equal to 0.25 wt% of C, less than or equal to 0.005 wt% of Si, less than or equal to 0.005 wt% of Mn, less than or equal to 0.0008 wt% of S, less than or equal to 0.003 wt% of P, less than or equal to 0.005 wt% of Al, less than or equal to 0.003 wt% of Ti, 0.003-0.007 wt% of Ce, 0.001-0.004 wt% of La, trace of Nd and Pr and the balance Fe and inevitable impurities; and the preparation method comprises the following procedures of KR molten iron pre-desulfurization, converter deep dephosphorization, LF deep desulfurization, RH deep deoxygenation, continuous casting and electroslag remelting in sequence. The purity of the iron prepared by the method is high.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to an industrial ultra-pure iron and a production method thereof. Background technique [0002] Pure iron is an important raw material for the production of magnetic materials, electrothermal alloys, precision alloys and special metal materials. As the requirements for precision alloys and magnetic components are getting higher and higher, cutting-edge high-tech products have higher and higher requirements for purity. [0003] my country adopts GB9971 and GB6983 to produce raw material pure iron and industrial pure iron, which are generally manufactured by converter or converter + refining outside the furnace, but the purity is not high, the impurity elements of pure iron are high, and the purity of the actual quality is low, especially carbon, sulfur and phosphorus It is relatively high and can only be used to make ordinary parts. These pure irons are no longer s...

AI Technical Summary

Problems solved by technology

[0006] At present, there are many domestic patents or articles on converter / electric furnace + refining and refining iron outside the furnace, but for the long process of hot metal pretreatment + converter + refining outside the furnace + continuous casting + electroslag remelting, The first production method of industrial ultra-pure iron that can be used to produce higher-quality low-alloy ultra-high-strength steel, post-hardening ultra-high-strength steel, advanced blade steel or low-medium carbon high-purity stainless steel