High-nickel austenite nodular cast iron and production technique for same

Abstract

The invention discloses high-nickel austenite nodular cast iron. The high-nickel austenite nodular cast iron is characterized in that the austenite nodular cast iron comprises the following chemical components in percentage by weight: 2.35-2.7% of carbon, 1.75-2.0% of silicon, 0.7-0.9% of manganese, smaller than or equal to 0.05% of phosphor, 18-19.5% of nickel, 1.75-1.9% of chromium, 0.05-0.065% of magnesium and the balance of iron. The production technique for the high-nickel austenite nodular cast iron comprises the following steps of material preparation, medium-frequency furnace smelting, sampling analysis, molten metal outlet nodulizing, inoculation treatment, solid solution strengthening and ageing treatment. According to the high-nickel austenite nodular cast iron and the production technique, a casting with qualified mechanical performance can be obtained through the reasonable production technique, and the casting is applicable to long-term stable production; a substrate texture is strengthened through thermal treatment modes of solid solution strengthening and ageing treatment, and the tenacity of the substrate texture is enhanced; the grains are refined; segregation is omitted; internal stress is lowered; and therefore the texture and performance are more uniform, and the requirement of corrosion resistance, especially sea water corrosion resistance is met.

Description

technical field [0001] The invention belongs to the field of nodular cast iron, and in particular relates to a high-nickel austenitic nodular cast iron and a production process thereof. Background technique [0002] Austenitic ductile iron is an alloy material widely used today. It has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, and is widely used in household products, auto parts, medical appliances, building materials, chemical industry, food industry , agriculture, ship parts, etc. [0003] The existing high-nickel austenitic ductile iron has inconsistent standards, the chemical composition range is too wide, and there is no metallographic structure for stable production of this material. It is not suitable for long-term stable production. The chemical composition contains a large number of promoting carbide elements. Such as chromium, manganese, etc., the molten iron tends to be white, the fluidity of the molten iron i...

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Problems solved by technology

[0003] The existing high-nickel austenitic ductile iron has inconsistent standards, the chemical composition range is too wide, and there is no metallographic structure for stable production of this material. It is not suitable for long-term stable production. The chemical composition contains a large number of promoting carbide elements. Such as chromium, manganese, etc., the molten iron tends to be white, the fluidity of the molten iron is poor, and the shrinkage is large. If the process is not handled properly, it is easy to obtain castings with high brittleness, carbides exceeding 30%, and unqualified spheroidization grades.

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