SU1379334A1 - Cast iron - Google Patents

Abstract

The invention relates to metallurgy and can be used for the production of wear-resistant iron castings. The goal is to increase the shock-abrasive resistance, flexural strength at elevated temperatures and resistance to tempering. New cast iron contains components in the following ratio, wt.%: C 1.8-3.2; Si, 8; Mp 0.5-1.5; Cr 16-22.0; Si 0.5-1.5, borides of rare-earth metals 0.68-3.4; Fe rest. The additional content of borides (for example, BLgg) provides an increase in the shock-abrasive resistance by 1.6-2.1 times, the flexural strength at 1.50 ° C by 1.33-1.66 times and resistance to tempering in 1 28 I, 33 times. 1 tab. in cl

Description

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The invention relates to metallurgy, in particular to the development of the composition of cast iron for castings operating under conditions of intense abrasive wear,

The purpose of the invention is the application of impact-abrasive resistance, flexural strength at elevated temperatures and resistance to tempering,

The essence of the invention consists in the additional content in the composition of the proposed pig iron of rare earth metals, in particular, lanthanum borides. Enhancement of the properties of cast iron is achieved due to the compact form of boride particles and their dispersity, the HGHino reinforcement of the metal base, the high refractoriness of rare earth metal borides improves wear resistance, the strength of the alloy at elevated temperatures, etc.

The cast iron is cast in an induction furnace. Borides of rare-earth metals are formed directly during the crystallization of the melt simultaneously treated with ferroboron and ferrolanthane, and the ratio between lanthanum and boron introduced into the pig iron melt, {2: 1. Chemical compositions of known and proposed cast iron and their properties are given in the table,

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As follows from the table, the additional presence of boride rare-earth metals in the composition of the proposed cast iron ensures the penetration of impact-abrasion resistance 1.6-2.1 times, the flexural strength at 500 ° C - 1.33-1.66 times and stability against vacation - 1.28-1.33 times.

Claims (1)

Invention Formula Cast iron containing carbon, silicon, manganese, chromium, copper and iron, characterized in that, in order to increase the impact-abrasive resistance, the flexural strength at permanent temperatures and resistance to tempering, it additionally contains rare-earth metal borides in the following ratio of components , wt.%: 0 Carbon Silicon Manganese Chrome Copper Rare Earth Metal Borides Iron 1.8-3.2 0.4-0.8 0.5-1.5 16-22.0 0.5-1.5 0.68-3.4 Else M HRC mm 3,01,8 1,00,4 2,00,5 1616 1,20,5 0.68 1.5 The rest is the rest 58 60 3.2 0.8 1.5 22 1.5 3.4 Else Else 60 64 66 Property Components Component content, ma.X and property values  Famous cast iron Offered cast iron level T average level upper level 0 Shock-abrasive resistance to Abrasive resistance to, Strength at bending test at 500 С Resistance against vacation, C Table continuation Offered cast iron T average level upper level 5.4 9.7 100 600 6.3 15.3 80 580