Smelting method of phosphorus containing steel

Abstract

The invention discloses a phosphor containing steel smelting method. Converter is adopted fast heating up to eliminate carbon, save phosphor, and make high phosphor slag smelting operation. When the converter is at blowing early stage, oxygen lance positing is between 0.0-1.0meter, diacidic base degree is 1.0-2.5, oxygen supply intensity is 2.8-5.0m3 / t. min, 0.5-45.0kg / ton steel barringerite or phosphate ore is added into the converter; then 1.0-30.0kg / ton is added at the blowing late stage. After scrap steel is melted with iron liquid to form molten steel in electric furnace, slag forming material is add, diacidic base degree is 1.0-2.5, oxygen supply intensity is 1.5-4.5m3 / t.min. 0.5-40.0kg / ton steel barringerite or phosphate ore is added into molten steel at decarbonizing process; and 0.5-30.0kg / ton is added at smelting late stage. This smelting method can make most phosphor enter molted steel to do phosphor alloying.

Description

technical field [0001] The invention relates to a method for smelting alloy steel, in particular to a method for smelting phosphorus-containing steel, which belongs to the class C21C5 / 56 (Int.cl 4 ). Background technique [0002] Phosphorus-containing steel refers to special steel containing phosphorus, such as weather-resistant steel, and weather-resistant steel is mainly divided into weather-resistant steel for welding structures and high-weather-resistant structural steel. Both weather-resistant steels contain phosphorus (P). Electric furnace smelting. According to the conventional smelting method of converter or electric furnace, in the early stage of smelting, while removing carbon [C] from molten steel, phosphorus [P] from molten steel is also removed, and the end point components of molten steel are carbon [C], silicon [Si], manganese [Mn], phosphorus [P], sulfur [S], etc. are all controlled at a low level, and then the phosphorus alloy is used to alloy the molten s...

AI Technical Summary

Problems solved by technology

According to the conventional smelting method of converter or electric furnace, in the early stage of smelting, while removing carbon [C] from molten steel, phosphorus [P] from molten steel is also removed, and the end point components of molten steel are carbon [C], silicon [Si], manganese [Mn], phosphorus [P], sulfur [S], etc. are all controlled at a low level, and then the phosphorus alloy is used to alloy the molten steel; the problem is: the phosphorus alloy is used to alloy the molten steel. The recovery rate is low, the metallurgical process is long, and the pollution to the environment is large. The phosphorus [P] resources in the molten iron are not fully utilized. Most of the phosphorus [P] in the molten iron is removed in the process of converter blowing or electric furnace smelting, and then Phosphorus alloying is used to alloy molten steel, which not only prolongs the smelting time, but also wastes resources and increases smelting costs.