Method of arc-shaped continuous casting production of high-carbon high-alloy ledeburite steel

Abstract

The invention discloses a method of arc-shaped continuous casting production of high-carbon high-alloy ledeburite steel. The method comprises the following steps that I, a low-melting-point ternary slag system is adopted by an LF, VD vacuum treatment, calcium treatment and soft blowing treatment are conducted, and the gas content is controlled, specifically, the content of [O] is smaller than or equal to 30ppmv, the content of [N] is smaller than or equal to 180ppmv, and the content of [H] is smaller than or equal to 2ppmv; II, the temperature of superheat ranges from 35 DEG C to 45 DEG C; a side hole submerged type nozzle is adopted, and the insertion depth of the submerged type nozzle ranges from 110mm to 120mm; and the casting speed ranges from 0.55m / min to 0.60m / min; III, 40Cr13 moltensteel is used by continuous casting pouring, and the high-carbon high-alloy ledeburite steel and the 40Cr13 special steel grade conduct continuous pouring; IV, pit type annealing is conducted, specifically, the annealing temperature is 820 DEG C, heat preservation is conducted for 24 hours, a product is cooled to enable the temperature to be 150 DEG C or below along with a pit and leaves from thepit; and V, small plate continuous casting blanks are formed through continuous casting, specifically, the cross section of each small plate continuous casting blank is 150*500mm<2>. According to thesmall plate blanks formed through continuous casting, the surfaces are free of polishing treatment, and the small plate blanks can be directly rolled and cooled to serve as mold plates instead of mold casting flat ingots.

Description

technical field [0001] The invention relates to the field of mold steel continuous casting production, in particular to the field of continuous casting of high-carbon and high-alloy ledeburite steels, and relates to a method for producing high-alloy ledeburite steels by an arc continuous casting machine. Background technique [0002] The development level of tools and molds is one of the important indicators to measure the development level of a country's manufacturing industry. It is predicted that from 2017 to 2020, the average annual growth rate of my country's tool and mold industry will remain at around 8%. The largest user of tools and dies is the automobile industry. Cutting tools and cold-working dies are used the most in the automotive industry. High-alloy cold-working die steel has a balanced structure of ledeburite, high hardness, and poor toughness, which is not conducive to continuous casting production. . Domestic manufacturers all adopt die-cast square ingot...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the surface and internal quality problems of continuous casting high-alloy tool steel produced by continuous casting machine: the present invention relates to a method for producing high-alloy cold-work die steel by arc-shaped continuous casting machine. The method continuously casts high-carbon high-alloy continuous casting slabs , no cracks on the surface, central porosity, central shrinkage cavity, and central cracks are all less than 2.0 grades