A kind of alloy material and its casting process resistant to molten aluminum zinc liquid corrosion

Abstract

The invention discloses an alloy material resistant to corrosion of molten aluminum. The alloy material comprises the following components in percentage by weight: 0.40%-0.60% of C, 9%-11% of Cr, 2%-2.5% of Si, 0.7%-1.0% of Mo, 0.7%-3% of W, 0.05%-0.2% of Ti, 0.05%-0.2% of rare earth and the balance of iron and inevitable impurities. According to the alloy material, a novel alloy design thought is adopted, a Ni-free alloy design is adopted, a proper amount of Si, Mo, W and trace Ti and rare earth are added on the basis of medium carbon (0.40%-0.60%) and medium chromium (9%-11%), and smelting, casting and thermal treatment are carried out, so that the alloy material has very high tempering stability and high-temperature hardness, can be used for a long time in the molten aluminum at 620-650 DEG C; and the alloy material has tensile strength greater than or equal to 820MPa, surface hardness greater than or equal to 280HB, and ductility greater than or equal to 18%, and especially has tensile strength greater than or equal to 620MPa and ductility greater than or equal to 21% at a high temperature of 620 DEG C, so that the service life of the alloy material is prolonged by more than once on the basis of a conventional material and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of high-temperature corrosion resistance and wear resistance, in particular to a molten aluminum-zinc liquid corrosion-resistant alloy material and a casting process thereof. Background technique [0002] The sinking rolls and stabilizing rolls in the continuous hot-dip aluminum-zinc sheet production line are immersed in the molten aluminum-zinc liquid at nearly 620-650 °C, and are corroded and penetrated by the highly active aluminum-zinc liquid, resulting in zinc slag and pitting corrosion on the roll surface. At the same time, the strip steel drives the sinking roller to move at a speed of 30-35m / s, and the aluminum-zinc liquid and the steel belt have a strong high-temperature wear effect on the surface of the sinking roller. At present, most of the sinking rollers and stabilizing rollers produced in the market are made of high-chromium-nickel alloy steel 316L and 317L, and foreign materials are basically extended ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the high-chromium-nickel alloy steel 316L or 317L used in the prior art for sinking rollers and stabilizing rollers, but there has been no major breakthrough in the high-temperature corrosion resistance and high-temperature wear resistance of these materials, and the cost of high-chromium-nickel alloys High, short service life, frequent replacement caused the defects of secondary increase in the cost of production enterprises, to provide a corrosion-resistant molten aluminum zinc alloy material