Experimental Study on Stainless Steel Pitting Critical Condition in Central Heating System
Urban central heating is one of the important measures of pollution control and energy saving,and the quality of circulating water in heat network is the key to ensure the safe and stable operation of heat network system.Due to the large and complex centralized heat network system,involving a wide range of areas,the heating system lacks relevant national and industry related water quality standards.The experimental study shows that in the 95℃test water sample,the critical Cl-concentration of TP 304 stainless steel is between 80～100 mg/L,and the critical Cl-concentration of TP316L stainless steel is between 120～130 mg/L;in the 130℃test water sample,the critical Cl-concentration value of TP316L stainless steel is between 20～30 mg/L.Improving the heat net circulating water pH or adding suitable corrosion inhibitor can improve the ability of stainless steel to resist Cl-pitting to a certain extent.
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