Duplex stainless steel flange and the comparison of austenite and ferrite stainless steel flange

Duplex stainless steel flange and austenitic stainless steel flange, and the comparison of ferritic stainless steel flange
The duplex stainless steel flange is in its solid quenching organization ferrite and austenite facies each half, general minimum phase content may be as high as 30%.
Due to the features of the two phase, with proper control of chemical composition and heat treatment process, make the DSS both ferritic stainless steel flange and the advantages of austenitic stainless steel flange.
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Compared with austenitic stainless steel flange, the advantage of duplex stainless steel flange is as follows:
(1) the yield strength is more than twice as tall as ordinary austenitic stainless steel flange, and has enough plastic molding need toughness. Manufactured duplex stainless steel flange of the storage tank and pressure vessel wall thickness than the commonly used austenitic reduce 30-50%, reducing the cost.
(2) has excellent resistance to stress corrosion cracking ability, even the lowest alloy content of duplex stainless steel flange are higher than austenitic stainless steel flange of the ability of resistance to stress corrosion cracking, particularly in situations of chlorine ion. Stress corrosion is common austenitic stainless steel flange is difficult to solve the outstanding problems.
(3) the most widely used in many medium of 2205 duplex stainless steel flange corrosion resistance is superior to the ordinary 316 l austenitic stainless steel flange, and the super duplex stainless steel flange has a very high corrosion resistance, and then some medium, such as acetic acid, formic acid and even can replace high alloy austenitic stainless steel flange, and corrosion resistant alloy.
(4) has a good resistance to local corrosion performance, and the alloy content rather than austenitic stainless steel flange, its wear resistance corrosion and corrosion fatigue performance is better than that of austenitic stainless steel flange.
(5) is lower than the linear expansion coefficient of austenitic stainless steel flange, and carbon steel, suitable for connecting with carbon steel, has important engineering significance, such as production of composite panels or lining, etc.
(6) no matter under the condition of dynamic load and static load, than austenitic stainless steel flange has higher energy absorption capacity, the structure to cope with sudden accidents such as collision, explosion, etc., duplex stainless steel flange obvious advantages, has practical application value.
Compared with austenitic stainless steel flange, the weakness of the duplex stainless steel flange is as follows:
(1) application of universality and multifaceted than austenitic stainless steel flange, such as its temperature must be controlled below 250 degrees Celsius.
(2) the plastic toughness was lower than those of austenitic stainless steel flange, cold and hot working process and forming performance than austenitic stainless steel flange.
(3), medium temperature brittleness area need to strictly control the process of heat treatment and welding system, in order to avoid the occurrence of harmful phase, damage performance.
Compared with the ferritic stainless steel flange, the advantage of duplex stainless steel flange is as follows:
(1) the comprehensive mechanical properties are better than ferritic stainless steel flange, plastic toughness, in particular, is not sensitive to brittle like ferritic stainless steel flange.
(2) in addition to the stress corrosion resistance and other local corrosion resistance are better than ferritic stainless steel flange.
(3) the cold working process and cold forming performance is far better than that of ferritic stainless steel flange.
(4) the welding performance is far better than ferritic stainless steel flanges, generally do not need to preheat before welding and without heat treatment after welding.
(5) the application scope of the ferritic stainless steel flange width.
Above all, can be summarized to see DSS performance and overview of the process performance, the use of it to its superior mechanical and corrosion resistant performance won the favor of users, has become both save weight and save the investment of excellent corrosion resistant engineering materials.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)

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