To fulfill the expectant FIRR of smelting enterprises,accurate figure of working cost of smelting can be calculated by using Benefit-cost Analysis financial appraisal using spreadsheets,and be taken for reference on ore price negotiations by enterprises.

This text discussed the preparation of silica powder , ferrosilicon , silicon nitride powder, silicon carbide powder with smelting processing technology of silica ,which has the principle, craft process and production method, combining brief introduction the kind and use of the product of silica.

Introduced in the paper is the mini-flow melting process of P5 Steel with the 90t UHP EAF adopted by Pangang Group Chengdu Iron & Steel Co.

Use of hot metal as electrical arc furnace raw material gains increasing interest in Electric Steelmaking Owing to its influence to the melting process and production, the use of hot metal is considered more and more world wide.

The effect of different steelmaking processes on mechanical properties of steel,especially on impact toughness of steel for drill color has been studied.

According to production practice, the steelmaking process of T91 has been analyzed , and three modified schemes are suggested.

This paper calculated the parameters of melting technology, and showed that qualified supreme low-carbon stainless steel can be successfully produced with EF-AOD furnace, in which carbon can be dillumi-nated and chromium be preserved.

Exploration for Melting Technology of Ultra-Low-Carbon Stainless Steel in AOD furnace;