Austenite ductile iron with low nickle content and high manganses and chromium content and technology thereof

Abstract

The invention relates to a cheap and excellent low-nickel, high-manganese and high-chromium austenitic ductile cast iron and a preparation process thereof. The ductile iron comprises the following components by weight percentages: 0.7-1.5% of C, 1-2.3% of Si, 9-15% of Mn, 2-5% of Ni, 14-17% of Cr, 1-3% of Cu and Fe. The preparation process is as follows: furnace charges adopted comprise common iron, scrap steel (steel scraps), return scraps, low-carbon ferromanganese, electrolytic nickel, ferrochromium, electrolytic copper and 75 ferrosilicon; the charges are melted by an electrical furnace or an intermediate frequency furnace, the tapping temperature is over 1650 DEG C, the ferrosilicon and calcium silicon are added to a casting ladle for modification, wherein, the quantity of the calcium silicon added is 0.5-0.8%. The non-magnetic austenitic ductile iron is applicable to the production of impellers of submersible pumps in the petroleum industry, casing, chemical fittings, water pump bodies, wearable valve gears, seawater corrosion resistant parts, etc.

Description

technical field [0001] The invention relates to an austenitic nodular cast iron and a process method thereof, in particular to a low-nickel, high-manganese, high-chromium austenitic nodular cast iron and a process method thereof. Background technique [0002] At present, copper is usually used to manufacture parts such as valve fittings and nuts, but because copper is expensive, its manufacturing cost is very high. High-alloy austenitic ductile iron has good high-temperature mechanical properties, corrosion resistance and lubricity, and can be used to manufacture valve fittings and nuts and other parts. This alloy is non-magnetic and suitable for the production of various valve equipment. Its wear resistance, resistance The tensile strength has exceeded that of copper, and it is the preferred material to replace copper for valve fittings and nuts. [0003] At present, Ni-Mn series austenitic cast iron has been formed, usually containing 12.0-14.0% nickel and 6.0-7.0% mangan...

AI Technical Summary

Problems solved by technology

For example, German patent 683699 reports that when Mn-Ni-Cu austenitic cast iron contains C 2.5-3.5%, Si 2.0-5.0%, Mn 4.0-12.0%, Ni 1.5-8.0%, Cu 0-10.0%, although the remaining A considerable amount of nickel increases the amount of silicon to 5%, and the amount of carbides is still as high as 5%, resulting in high hardness of the alloy, difficulty in cutting, and easy rust

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