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Pakistan's prime minister visit ensign energy saving company special assistant
Release date:2013-03-25 11:27

oth stainless steel and heat resistant steel, austenite size is best for the comprehensive performance of steel plate, have enough strength, and has excellent plasticity and hardness is not high also, this is also one of the reasons they have been widely used. Austenite size stainless steel with the vast majority of other metal material similar to that of its tensile toughness decrease slowly, there is no brittle transition temperature. So stainless steel at low temperature can keep enough plasticity and toughness.
Duplex stainless steel is in its so-called solid quenching organization ferrite and austenite facies 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 has both the advantages of ferritic stainless steel and austenitic stainless steel.
Compared with austenitic stainless steel, duplex stainless steel edge is as follows:
(1) yield strength is more than twice as tall as ordinary austenitic stainless steel, and plastic molding need enough toughness. Adopts duplex stainless steel tank or 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 of duplex stainless steel alloy content are higher than austenitic stainless steel's resistance to stress corrosion cracking ability, especially in the environment of the chlorine ion. Stress corrosion is common austenitic stainless steel is difficult to solve the outstanding problems.
(3) the application of the most common in many medium corrosion resistance of 2205 duplex stainless steel 316 l austenitic stainless steel is better than the ordinary, and super duplex stainless steel has high corrosion resistance, and in some media, such as acetic acid, formic acid, etc can even replace high alloy austenitic stainless steel, corrosion resistant alloy.
(4) has a good resistance to local corrosion performance, compared to the alloy content quite austenitic stainless steel, its wear resistance corrosion and corrosion fatigue performance is better than that of austenitic stainless steel.
(5) is lower than the linear expansion coefficient of austenitic stainless steel, carbon steel and close, suitable for connecting with carbon steel, has important engineering significance, such as the production of composite panels or lining, etc.
(6) no matter under the condition of dynamic load and static load, than austenitic stainless steel has higher energy absorption capacity, the structure to cope with sudden accidents such as collision, explosion, etc., obvious advantages, duplex stainless steel has practical application value.
Compared with austenitic stainless steel, the weakness of the duplex stainless steel is as follows:
(1) application of universality and multifaceted than austenitic stainless steel, such as its temperature must be controlled under 250 degrees Celsius.
(2) the plastic toughness lower than austenitic stainless steel, cold and hot working technology and forming properties than austenitic stainless steel.
(3) medium temperature brittleness zone, heat treatment and welding process must be strictly controlled system, in order to avoid the emergence of the harmful phase, damage performance.
Compared with the ferritic stainless steel, duplex stainless steel edge is as follows:
(1) comprehensive mechanical properties are better than ferritic stainless steel, plastic toughness, in particular, don't like ferritic stainless steel is sensitive to brittleness.
(2) in addition to the stress corrosion resistance, other local corrosion resistance are better than ferritic stainless steel.
(3) the cold working process and cold forming performance is far superior to that of ferritic stainless steel.
(4) the welding performance is far better than the ferritic stainless steel, in general, it does not need to preheat before welding and without heat treatment after welding.
(5) a ferritic stainless steel wide application range.
Compared with ferritic stainless steel, the weakness of the duplex stainless steel is as follows:
Alloy element content is high, the price is relatively high, general ferrite do not contain nickel.
Above all, can be summarized to see DSS overview of the properties and process performance, the use of it to its superior mechanical and corrosion resistance comprehensive performance won the favour of consumer, has become both save weight and save investment of excellent anticorrosion engineering materials.
(1) yield strength is more than twice as tall as ordinary austenitic stainless steel, and plastic molding need enough toughness. Adopts duplex stainless steel tank or pressure vessel wall thickness than the commonly used austenitic reduce 30-50%, reducing the cost.

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