Effect of C and N contents on intergranular corrosion property of NS1402 corrosion-resistant alloy

doi:10.13251/j.issn.0254-6051.2025.04.012

Abstract

Abstract: Effects of different C and N contents on intergranular corrosion property of NS1402 alloy was investigated. The results show that no precipitate is produced in the microstructure of the NS1402 alloy after sensitization at 675 ℃ and 750 ℃. When the sensitization temperature is 675 ℃, reducing the C content has little effect on the intergranular corrosion rate of the alloy with the N content of less than 0.01%. When raising the sensitization temperature to 750 ℃, the intergranular corrosion of the alloy with both the C and N contents above 0.01% shows relatively serious corrosion characteristics as the average corrosion rate is 0.03 mm/month and the corrosion depth is to 24 μm. However, the intergranular corrosion of the alloy with both the C and N contents below 0.01% exhibits excellent intergranular corrosion resistance under the sensitization temperature of 750 ℃, and the average corrosion rate is only 0.01 mm/month.

Key words: NS1402 corrosion-resistant alloy, C content, N content, intergranular corrosion

CLC Number:

Shu Wei, Gu Yu. Effect of C and N contents on intergranular corrosion property of NS1402 corrosion-resistant alloy[J]. Heat Treatment of Metals, 2025, 50(4): 85-88.

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