431 (1.4057) Stainless Steel

431 stainless steel or 4057 or 1.4057 is a very common used martensitic stainless steel grade. This grade is written as 1.4057 or X17CrNi16-2 according to EN norm and it is written as UNS S43100 according to UNS norm. This grade is similar to 420, 630 and 1.4418 grades in some properties. 431 material is usually produced in quenched and tempered condition. In Bircelik warehouse, we keep both QT800 and QT900 heat threated conditions in our stocks. QT means Quenched and tempered and the number 800 or 900 shows the minimum ultimate tensile strength of the material. So if 1.4057 material is QT800 heat threated, then this means this material has a minimum tensile strenght of 800 MPA. This grade has a really good mechanical properties and the price of this grade is not to high. Because of these advantages, the use of 1.4057 stainless steel is really wide. 1.4057 stainless steel material used in shaft parts, pump parts, molding parts, chemical industries. because of its preheat threated condition, this grade can be used with out heat threatment in many applications. Heat threatment is necessary only if the material should be harder or stronger.


Grade Properties

General Properties Stars
Corrosion Resistance:  
Mechanical Properties:





431 (1.4057) Grade Material Stock List

Material Shape Min Diameter (mm)

Max Diameter (mm)

Round 5 250



431 (1.4057) Chemical Composition

Grade C Mn P S Si Cr Ni
431 (1.4057) 0.12 - 0.20 1.0 max 0.04 max 0.03 max 1.0 max 15.0 - 18.0 2.0 - 3.0



Links About 431 Grade