Low carbon magnesium integral composite stopper rod

Abstract

The present invention relates to one kind of integral composite stopper for continuous casting. The integral composite stopper includes one stopper head and one stopper body of Al-C material, and features the stopper head of low carbon magnesium material comprising fused magnesia with magnesium oxide content over 96 wt% in 50-80 wt%, magnesia alumina spinel in 0-30 wt%, graphite with carbon content over 95 wt% in 5-12 wt%, one or several of Si, Al, silicon carbide and boron carbide in 2-10 wt%, and phenolic resin as binder in 4-8 wt%. The integral composite stopper has high scour resistance, high molten steel erosion resistance, high thermal shock resistance, and long service life.

Description

(1) Technical field [0001] The invention relates to an integral composite stopper rod for continuous casting. (2) Background technology [0002] An integral composite stopper for continuous casting usually consists of a stopper rod body and a rod head. The stopper rod is used in a tundish, and its main function is to control the opening and closing of molten steel in the tundish and the steel flow in the crystallizer. The use conditions of the stopper are extremely harsh, not only to withstand high-temperature gas baking, strong thermal shock and severe erosion at the initial stage of steel pouring, but also to withstand the erosion of molten steel and covering agent. [0003] The common integral stopper rod head currently used is mainly made of aluminum carbon, such as Chinese patents CN02110202.3, CN02135497.9, CN03139125.7, the aluminum carbon rod head can meet the casting of most steel types, but for calcium-treated steel, The aluminum carbon rod head is seriously damag...

AI Technical Summary

Problems solved by technology

Although zirconium carbon plug rods have excellent erosion resistance, they have poor erosion resistance and a short service life. Moreover, due t