Material introduction of stainless steel 840 (S33400)

Inquiries : 153 - 2018/7/18 16:10:09

The 840 (S33400) alloy is an austenitic stainless steel containing titanium and aluminum. It contains enough chromium to form and maintain a sufficient scale of chromium oxide to protect it under high temperature conditions.It is more resistant to high temperatures than traditional chrome-nickel stainless steel such as 304.High nickel content makes it better anti-oxidation performance than the standard 18-8 stainless steel.Its oxidation resistance is not inferior to the use of higher grade alloys with temperatures up to 1900 degrees Fahrenheit (1038 ° C).Therefore, the 840 (S33400) alloy is an ideal material for the manufacture of electric heating pipes, automotive emission control systems and other high temperature resistant products.

chemical composition

Element	Content (%)
Nickel, Ni	19-20
Chromium, Cr	19-19.5
Manganese, Mn	1
Silicon, Si	0.75

Phosphorus, P	0.02
Sulfur, S	0.015
Titanium, Ti	0.4
Aluminum, Al	0.4
Copper, Cu	0.2
Carbon, C	0.03

Mechanical properties

property
T.S.	572.4 MPa
Y.S.	241.4 MPa
F.M.	200 GPa
EL	40%
Hardness、Hardness(B)	82

840 (S33400) stainless steel can be used in these fields: Due to its formability, weldability, corrosion resistance and oxidation resistance, Alloy 840 (S33400) is a common electric heating tube material used in the manufacture of electric heating tubes, heat exchangers, equipment heaters, industrial furnaces and other equipment are also commonly used in automotive exhaust systems.