Duplex stainless steel so-called duplex stainless steel "target=_blank> stainless steel is half of the ferrite phase and austenite phase in its solidified structure, generally the minimum phase content needs to reach 30%.
Due to the characteristics of the two-phase structure, DSS (Duplex Stainless Steel, DSS for short) has both ferritic stainless steel "target=_blank> stainless steel and austenitic stainless steel" target=_blank> stainless steel by correct control of chemical composition and heat treatment process. The advantages.
Compared to austenitic stainless steel "target=_blank> stainless steel, the advantages of duplex stainless steel "target=_blank> stainless steel are as follows:
(1) The yield strength is more than twice that of ordinary austenitic stainless steel "target=_blank> stainless steel, and it has sufficient plastic toughness for molding. The wall of the tank or pressure vessel is made of duplex stainless steel "target=_blank> stainless steel. Thickness is 30-50% less than the commonly used austenite, which helps to reduce costs.
(2) It has excellent resistance to stress corrosion cracking. Even the duplex alloy with the lowest alloy content "target=_blank> stainless steel has higher resistance to stress corrosion cracking than austenitic stainless steel "target=_blank> stainless steel. Especially in environments containing chloride ions. Stress corrosion is a prominent problem that is difficult to solve with ordinary austenitic stainless steel "target=_blank> stainless steel.
(3) The most common 2205 duplex stainless steel used in many media "target=_blank> stainless steel has better corrosion resistance than ordinary 316L austenitic stainless steel "target=_blank> stainless steel, while super duplex stainless steel" target=_blank >Stainless steel has extremely high corrosion resistance. In some media, such as acetic acid, formic acid, etc., it can even replace high-alloy austenitic stainless steel "target=_blank> stainless steel, even corrosion-resistant alloy.
(4) It has good local corrosion resistance, and its austenitic stainless steel "target=_blank> stainless steel has better wear resistance and fatigue corrosion resistance than austenitic stainless steel" target=_blank >Stainless steel.
(5) Austenitic stainless steel "target=_blank> stainless steel has a low coefficient of linear expansion and is close to carbon steel. It is suitable for connection with carbon steel and has important engineering significance, such as the production of composite panels or linings.
(6) Compared with austenitic stainless steel "target=_blank> stainless steel, it has higher energy absorption capacity under dynamic or static load conditions. This pair of structural parts can cope with unexpected accidents such as collisions, explosions, etc., duplex stainless steel" Target=_blank>The advantages of stainless steel are obvious and have practical application value.
Compared with austenitic stainless steel "target=_blank> stainless steel, the weakness of duplex stainless steel "target=_blank> stainless steel is as follows:
(1) The universality and versatility of the application is inferior to that of austenitic stainless steel "target=_blank> stainless steel, for example, its use temperature must be controlled below 250 degrees Celsius.
(2) Its plastic toughness is lower than that of austenitic stainless steel "target=_blank> stainless steel, cold, hot processing and forming properties are not as good as austenitic stainless steel" target=_blank> stainless steel.
(3) There is a medium-temperature brittle zone, and the process system of heat treatment and welding needs to be strictly controlled to avoid the occurrence of harmful phases and impair performance.
Compared with ferritic stainless steel "target=_blank> stainless steel, the advantages of duplex stainless steel "target=_blank> stainless steel are as follows:
(1) The comprehensive mechanical properties are better than ferritic stainless steel "target=_blank> stainless steel, especially plastic toughness, not as sensitive to brittleness as ferritic stainless steel "target=_blank> stainless steel.
(2) In addition to stress corrosion resistance, other local corrosion resistance is superior to ferritic stainless steel "target=_blank> stainless steel.
(3) Cold working process performance and cold forming performance are much better than ferritic stainless steel "target=_blank> stainless steel.
(4) Welding performance is also much better than ferritic stainless steel "target=_blank> stainless steel, generally no preheating before welding, no heat treatment after welding.
(5) The application range is wider than that of ferritic stainless steel "target=_blank> stainless steel.
Compared with ferritic stainless steel "target=_blank> stainless steel, the weakness of duplex stainless steel "target=_blank> stainless steel is as follows:
The alloying element content is high and the price is relatively high. Generally, the ferrite does not contain nickel.
In summary, the overview of the performance and process performance of DSS can be seen in general terms. It has won the favor of users with its superior mechanical and corrosion resistance performance, and has become an excellent resistance to both weight saving and investment saving. Eclipse engineering materials.
Shanghai Shangshang Stainless Steel "target=_blank> Stainless Steel Pipe Co., Ltd. 18301829793
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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