Duplex not steel pipe characteristics introduction: due to the characteristics of the duplex structure, DSS has the advantages of ferritic stainless steel and austenitic stainless steel through the correct control of chemical composition and heat treatment process. The advantages of duplex stainless steel compared with austenitic stainless steel yield strength is more than twice that of ordinary austenitic stainless steel, and has sufficient plastic toughness for forming. The wall thickness of tanks or pressure vessels made of duplex stainless steel is 30-50% smaller than that of ordinary austenitic, which helps reduce costs.
Duplex steel has excellent resistance to stress corrosion cracking. Even duplex stainless steel with low alloy content has a higher resistance to stress corrosion cracking than austenitic stainless steel, especially in environments containing chloride ions. Stress corrosion for ordinary austenitic stainless steel.
Difficult to solve the outstanding problems in many media widely used 2205 duplex stainless steel has better corrosion resistance than ordinary 316L austenitic stainless steel, while the super duplex stainless steel has extremely high corrosion resistance. In some media, such as acetic acid and formic acid, it can even replace high-alloy austenitic stainless steels and even corrosion-resistant alloys. Duplex steel tubes have good localized corrosion resistance. Compared with austenitic stainless steel of the same alloy content, its wear corrosion and fatigue corrosion performance is better than that of austenitic stainless steel. The linear expansion coefficient is lower than austenitic stainless steel and close to carbon steel. It is suitable for joining with carbon steel and has important engineering implications, such as the production of laminates or liners.