Austenite spheroidal iron and producing method thereof

Abstract

The invention provides austenite ductile iron and a production method thereof, relating to the technical field of metallurgical manufacture, in particular to the melting technology of the austenite ductile iron. The production method comprises melting, refining and pouring. The mass proportions of the various components forming the austenite ductile iron are respectively: 2.80-3.00 percent of C, 2.00-3.00 percent of Si, 0.50-1.50 percent of Mn, 18.00-22.00 percent of Ni and 1.00-2.50 percent of Cr. The invention has reasonable process and easy production and application. The formed product has the mechanical performance that sigma b is larger than 370MPa, delta is larger than 7 percent, and sigma 0.2 is larger than 210MPa, has the creep resistant performance that when t is equal to 520 DEG C, the stress reaches 150MPa, the creep speed in every 1000 hours is not larger than 0.10 percent, and has the high temperature strength that when t is equal to 700 DEG C, sigma b is not smaller than150MPa. Therefore, the product with heat resistance and corrosion resistance can be used for replacing heat-resistant steel.

Description

technical field [0001] The invention relates to the field of metallurgical manufacturing technology, in particular to the smelting technology of austenitic nodular iron. Background technique [0002] The annual output of heat-resistant and stainless steel castings in my country is about 200,000 tons, most of which are heat-resistant cast steel and stainless steel parts, of which 22,000 tons / year are heat-resistant iron castings, mainly chromium, silicon, aluminum-silicon, and high-alumina castings. Among them, there are only 6,000 tons of high-silicon iron castings per year. Compared with austenitic nodular iron, they have similar oxidation resistance and growth resistance, but are far inferior to austenitic nodular iron in terms of thermal shock resistance and high temperature performance. Iron pieces. [0003] Because austenitic ductile iron has good high temperature resistance, oxidation resistance and corrosion resistance, high temperature and ultra-low temperature mechan...

AI Technical Summary

Problems solved by technology

Since the selection of alloy materials has not been standardized in our country, many of the above-mentioned parts are currently replaced by heat-resistant steel or stainless steel, which is costly and has a lifespan that is not as good as that of austenitic ductile iron, resulting in a large waste