Anti-corrosion ultra-low carbon high-silicon iron-base alloy and preparation method thereof

Abstract

The invention discloses an anti-corrosion ultra-low carbon high-silicon iron-base alloy and a preparation method thereof, and belongs to the field of anti-corrosion alloys. The anti-corrosion ultra-low carbon high-silicon iron-base alloy is characterized in that the alloy chemical components comprise, by weight, smaller than or equal to 0.005% of C, 14.4-20.0% of Si, smaller than or equal to 0.008% of P, smaller than or equal to 0.008% of S, 0.01-0.05% of RE, and the balance Fe and inevitable impurities. The preparation method of the anti-corrosion ultra-low carbon high-silicon iron-base alloycomprises the following steps that pure iron, waste steel, silicon iron and other raw materials are added into an electric induction furnace or an electric arc furnace for two times of smelting, theraw materials are sufficiently mixed evenly, the smelting temperature of the alloy is 1530-1550 DEG C, the discharging temperature is 1450-1480 DEG C, rare earth silicon iron alloys are added in a ladle before discharging from the furnace, resin casting is adopted for forming, the casting temperature is 1380-1420 DEG C, annealing is performed immediately after solidification for 0.5-1 hour, the mixture is loaded into a heat treatment furnace which is preheated to 700-850 DEG C under the state of not opening a box, the furnace is cooled to 50 DEG C with the cooling speed of 5-8 DEG C per hour after heat preservation of 2-3 hours, and then the mixture is discharged from the furnace to be air-cooled. The anti-corrosion ultra-low carbon high-silicon iron-base alloy prepared by the method has the good anti-corrosion performance and can be used for manufacturing components making contact with strong corrosive media.

Description

technical field [0001] The invention relates to a corrosion-resistant ultra-low-carbon high-silicon iron-based alloy and a preparation method thereof, belonging to the field of corrosion-resistant alloys. Background technique [0002] With the development of industry, people have higher and higher requirements for materials on equipment exposed to strong corrosive environments. Generally, the electrode potential of iron and steel materials is low, and a dense oxide film cannot be formed. Adding a large amount of Cr element to stainless steel can form dense Cr 2 o 3 The passivation film significantly improves the corrosion resistance of the alloy, but in strong oxidizing acid solution Cr 2 o 3 The poor stability of the passivation film significantly reduces its corrosion resistance, so the corrosion problem under strong oxidizing acid medium has attracted people's attention, so the material of high silicon cast iron has been produced. High-silicon cast iron contains a hig...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor corrosion resistance of ordinary castings, and low strength and impact toughness, high hardness, and high brittleness of high-silicon cast iron. Through effective chemical composition design, an ultra-low carbon high Ferrosilicon-based alloy, which further improves the corrosion resistance

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