High-manganese steel smelting process and high-manganese steel casting

Abstract

This invention relates to a smelting technology for high Mn steel and the cast poured with said technology, in which, the basic element is Fe, the main elements are Mn (10-14%) C (1-1.4%) and FeMn, broken electrode carbon and steel rods are the raw materials characterizing in putting FeMn and broken electrode carbon in the furnace at lump-sum first under the protection of a covering agent, then putting steel rods on the FeMn and broken electrodes then to feed electricity to melt them with high power, the melt is always under the protection of the covering agent during the smelting process, the liquid surface is not allowed to be stored up.

Description

technical field [0001] The invention relates to a smelting process technology for alloy structural steel, especially high manganese steel, and high manganese steel castings poured using the technology. Background technique [0002] High-manganese steel is austenitic wear-resistant steel, and its matrix has high plasticity and high toughness, which are difficult to achieve with general materials. High-manganese steel castings are often used as some mechanical parts that are wear-resistant, wear-resistant and impact-resistant. For the traditional process of smelting high manganese steel, there is a more detailed description in the book "Casting Handbook Second Volume Cast Steel" published by Machinery Industry Press in 1997. The process requires adding roasted red ferromanganese after the charge is cleared and Fully stir the molten steel; In addition, in the third issue of 2003 "New Technology and New Technology" thermal processing technology, an articl...

AI Technical Summary

Problems solved by technology

However, in the manufacture of aviation parts, it is difficult to cast products that can meet the technical standards of my country's aviation industry for structural steel investment castings by using the above-mentioned processes. Most of them have surface concave defects, slag inclusions and cracks during visual inspection and fluorescent inspection. Meet the requirements for the use of aviation parts with high quality requirements

[0004] Analyze the reasons for the above phenomenon. In the smelting of high manganese steel, free oxygen in molten steel combines with manganese, iron and carbon elements to form manganese oxide, iron oxide, carbon monoxide, and carbon dioxide gas. The gas escapes from the molten steel, and iron oxide in It can be dissolved at 1420°C, and the Fe element is replaced and reduced by C and Mn in molten steel. Therefore, most of the oxides in molten steel are manganese oxide. Manganese oxide is a kind of high density and high decomposition temperature (about 1650°C). Oxide slag that is not easy to remove, the traditional process requires that the molten steel should be fully stirred, which will inevitably increase the free oxygen in the molten steel, resulting in the formation of more manganese oxide slag