ASTM A249-84b stainless steel 201 steel tube
International materials resistant to corrosion by corrosion rates of year divided into three categories, first class for full corrosion resistance, its corrosion rate of less than 0.1mm/ years, high quality stainless steel belong to such material ; corrosion resistance of the second kind, its corrosion rate of 0.1-1.0mm/ years, General stainless steel corrosion resistance of third class is not, each of its corrosion rate is greater than 1.0mm. Analysis of the discovery of counterfeit products of stainless steel, corrosion rates up to 9.67mm/ years, is a serious corrosion. In further analysis of the product, and found that the product only represents stainless steel indicator of chromium content in and 10.03%, far less than the minimum requirements of demand 10.5% of chromium stainless steel.
