Comparison of Corrosion Resistance between 317L Stainless Steel Pipe and 316Ti Stainless Steel Pipe
Nov 12,2021
317L stainless steel pipes can be corroded by weak corrosive media such as air, steam, and seawater, while 316Ti stainless steel pipes can be corroded by chemical corrosive media such as acid, alkali, and salt. In practical application, steel that is resistant to weak corrosive media is often referred to as 317L stainless steel pipe, while steel that is resistant to chemical media corrosion is referred to as acid resistant 316ti stainless steel pipe. Due to the difference in chemical composition between the two, the former may not be resistant to chemical corrosion, while the latter generally has non rusting properties. The corrosion resistance of stainless steel pipes depends on the alloy elements contained in the steel. Chromium is the fundamental element that enables stainless steel pipes to achieve corrosion resistance. When the chromium content in steel reaches around 12%, chromium reacts with oxygen in the corrosive medium to form a thin oxide film (self passivation film) on the surface of the steel, which can prevent further corrosion of the steel substrate. In addition to chromium, commonly used alloying elements include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of various applications for the structure and function of stainless steel pipes. Stainless steel pipes are generally classified according to their matrix structure as follows: ① ferritic stainless steel pipes. Containing 12% to 30% chromium. Its corrosion resistance, durability, and weldability improve with the increase of chromium content, and its resistance to chloride stress corrosion is superior to other types of stainless steel pipes. ② Austenitic stainless steel pipe. It contains more than 18% chromium, around 8% nickel, and small amounts of molybdenum, titanium, nitrogen, and other elements. It has good inductive function and can withstand corrosion from various media. ③ Austenitic ferritic duplex stainless steel pipe. It combines the benefits of austenitic and ferritic stainless steel pipes and has superplasticity. ④ Martensitic stainless steel pipe. High strength, but poor plasticity and weldability.
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