Boron-iron and iron-titanium composite cored wire and application thereof

Abstract

The invention relates to a boron-iron and iron-titanium composite cored wire and the application thereof. The powdery raw materials of the boron-iron and iron-titanium composite cored wire include boron iron and iron titanium, wherein the boron content of boron iron is not less than 9wt%, the titanium content of iron titanium is not less than 25wt%, and the mixing ratio of boron iron to iron titanium depends on the actual needs. The boron-iron and iron-titanium composite cored wire is manufactured by adding boron iron and iron titanium to molten steel at the same time, thereby simplifying the alloying operation in boron steel smelting and stabilizing the control of boron content in steel. Compared with the prior boron iron cored wire, the boron-iron and iron-titanium composite cored wire has the advantages of low proportion of boron iron, small fluctuation of deviation of the addition amount of boron iron, less loss, adequate protection of each boron iron fine particle by titanium element, and stable boron recovery rate (over 93%). The boron-iron and iron-titanium composite cored wire achieves the effect that the deviation of boron content in smelting components between furnaces for manufacturing the same boron-containing steel grades is less than 2ppm.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and relates to the production and use method of a composite cored wire made of ferroboron and ferrotitanium. Background technique [0002] Boron steel has good mechanical and process properties, simple heat treatment process and low price. Boron has many resources and less consumption. From the perspective of saving a large amount of expensive alloy elements such as nickel and chromium, boron steel has greater significance and attraction. [0003] During the solidification process of boron steel after smelting and casting, if boron and nitrogen in the steel form BN, the hardenability of the steel cannot be improved, so the nitrogen in the steel must be fixed by forming some kind of nitride, usually with titanium nitrogen. [0004] The prominent role of boron in steel is that a small amount of boron can double the hardenability of steel, but this is also one of its main disadvantages, that...

AI Technical Summary

Problems solved by technology

If the diameter of the iron-boron cored wire is reduced, it will bring difficulties to the production and use of the iron-boron cored wire