Practice of Producing P22 Low-phosphor Alloy Steel with EAF Process

Elaborated in the paper is how to use the EAF smelting process to produce the P22 low-phosphor alloy steel(with P content under 0.008%)with the raw materials,i.e.,scrap steel and high-phosphor liquid iron that is not pre-dephosphorized. Primary liquid steel with a P content under 0.003% can finally be produced by means of the EAF process that employs such techniques as early dephosphorization of the hot metal through slagforming at the early smelting stage,using lime as dephosphorizer,carrying large slag amount and multi-slag replacement operations,proper combination of high basicity and high-ferric oxide,intensive stirring of the bath,and restraining rephosporization with elevated temperature. In general,it is practical to use the EAF smelting process to realize in-lot production of high quality CC billets in P22 low-phosphor alloy steel for tube-making,providing that relevant techniques are adopted to properly control P pick-up of the ferroalloy and re-phosphorization of the slag.