低合金耐硫酸露点腐蚀钢的性能和应用

耐硫酸露点腐蚀钢是用于热交换部件的低合金钢。该钢主要分为两类:(1)以0.2%~0.5%Cu-＞0.010%S为基础,添加少量P、Sn、As、Sb、Se、Te等元素;(2)以Cu-Cr或Cu-Cr-Ni为基础的钢类,用于高温(130~160℃)、高浓度硫酸(80%~90%)的腐蚀环境。介绍了硫酸露点腐蚀环境的特点并讨论了合金元素对该低合金钢耐硫酸露点腐蚀的作用机制和国内外现有主要低合金耐硫酸露点钢的化学成分、力学性能和耐蚀性能。

Application and Properties of Low Alloying Sulfuric Acid Dew Point Corrosion- Resistant Steels

The sulfuric acid dew corrosion- resistant steels are low alloying steels for heat exchanging component. There are two kinds of sulfuric acid dew corrosion- resistant steel:(1)base alloy elements-0.2%～0.5%Cu-＞0.010S adding a small quantity P,Sn,As, Sb,Se, or Te;(2)Cu-Cr or Cu-Cr-Ni steels for corosion environ ment of concentrated sulfuric acid(80%～90%)at elevated temperature(130～160℃).The characteristics of sulfuric acid dew point environment are briefly introduced,and the mechanism of effect of alloy elements on sulfuric acid dew point corrosion-resistance of the low alloy steel are discussed and the chemical compositions,mechanical properties and corosion resistance of domestic and foreign current main low alloying sulfuric acid dew point corrosion-resistant steels are presented in this paper.