Duplex stainless steel pipe fittings combine the performance characteristics of 304 and austenitic stainless steel pipe fittings. This paper compares the duplex stainless steel pipe fittings with the stainless steel pipe fittings with 304 and 316L as the main material, and draws the following differences:
A. Duplex stainless steel pipe fittings have excellent resistance to stress corrosion cracking, especially in environments containing chloride ions, even duplex stainless steel pipes with alloy content have higher resistance to stress corrosion cracking than austenitic stainless steel pipes. capacity, stress corrosion is a prominent problem that ordinary austenitic stainless steel pipes are difficult to solve;
B. The corrosion resistance of the most commonly used duplex stainless steel pipe fittings in many media is better than that of ordinary 316L austenitic stainless steel pipe, while the super duplex stainless steel pipe has extremely high corrosion resistance, in some media, such as acetic acid, formic acid, etc. can even replace high-alloy austenitic stainless steel pipes, and even corrosion-resistant alloys;
C. It has good local corrosion resistance. Compared with austenitic stainless steel pipes with a similar alloy content, because of the high strength and good corrosion resistance of duplex stainless steel pipes, its wear corrosion resistance and corrosion fatigue performance are better than 304 stainless steel fittings.