National standard for duplex stainless steel
The new standard GB/T 20878-2007 "Grades and Chemical Composition of Stainless Steel and Heat Resistant Steel" in China has added many grades of duplex stainless steel. For example: 14Cr18Ni11Si4AlTi, 022Cr19Ni5Mo3Si2N, 12Cr21Ni5Ti. More grades can be found in the standard.
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The Use and Properties of Low Alloy Steel
Low alloy steel refers to alloy steel with a total alloying element content of less than 5%. Low alloy steel is relative to carbon steel, and is intentionally added with one or several alloying elements to improve the performance of steel based on carbon steel. When the amount of alloy added exceeds the normal production method of carbon steel, this type of steel is called alloy steel. When the total alloy content is less than 5%, it is called low alloy steel, ordinary alloy steel is generally b
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The Historical Development of Duplex Stainless Steel
Duplex stainless steel (DSS) refers to stainless steel with ferrite and austenite each accounting for about 50%, and generally requiring at least 30% of the lower phase content. In the case of low C content, the Cr content ranges from 18% to 28%, and the Ni content ranges from 3% to 10%. Some steels also contain alloying elements such as Mo, Cu, Nb, Ti, and N.
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