US 12,606,877 B2 · Ultra-high phosphorus molten iron low-cost smelting method for polar steel

Abstract

An ultra-high phosphorus molten iron low-cost smelting method for polar steel includes successively deoxidizing and tapping alloying raw materials including molten iron; performing slag adjusting and refining on the molten steel obtained in the converter smelting step to obtain a refined molten steel; vacuum degassing the refined molten steel; and performing continuous casting on the molten steel obtained after the RH degassing step to obtain a cast billet.

Claims18

Dependent claims

A molten iron low-cost smelting method for polar steel, comprising successively:

converter smelting including smelting, deoxidizing and tapping alloying raw materials including molten iron;
LF refining including performing slag adjusting and refining on molten steel obtained in the converter smelting step to obtain a refined molten steel;
RH degassing including vacuum degassing the refined molten steel;
performing continuous casting on the molten steel obtained after the RH degassing to obtain a cast billet.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/928,185Filed 7 Jun 2021

Priority

CN 202110553104.520 May 2021

Published

US 2023/0220504 A113 Jul 2023

Granted

21 Apr 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification22 codes

C21C 7/06
Removing impurities by adding a treating agent: deoxidising, e.g. killing
C21C 5/28
Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel: manufacture of steel in the converter
C21C 5/34
Regulating or controlling the blowing: blowing through the bath
C21C 5/36
Manufacture of steel in the converter: processes yielding slags of special composition

Ultra-high phosphorus molten iron low-cost smelting method for polar steel

Life of this patent

Ultra-high phosphorus molten iron low-cost smelting method for polar steel

Life of this patent

Abstract

Claims18