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Materials

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SS 321 / 321H

Stainless Steel 321 is a basic austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) addition. SS 321 is used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. SS 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion. SS 321H is a modification of SS 321 with a higher carbon content, to provide improved high temperature strength.

Specifications

Stainless Steel SS 321 / 321H
AISI 321 / 321H
UNS S32100 / S32109
Werkstoff Nr. 1.4541 / 1.4878

Mechanical & Physical Properties

Density 8.0 g/cm3

Melting Point 1454 °C (2650 °F)

Tensile Strength Psi-75000 ,MPa-515

Yield Strength (0.2%Offset) Psi-30000 ,MPa-205

Elongation 35 %

Chemical Composition

 

SS 321 SS 321H
Ni 9-12

9-12

Cr 17-19

17-19

C 0.08 max

0.04-0.10

N 0.10 max

 

Fe Balance

Mn 2 max

2 max

Si 0.75 max

0.75 max

S 0.03 max

0.03 max

P 0.045 max

0.045 max

Ti 5xC min
0.60% max

4xC min
0.60% max

Application

Aircraft Industry
Fabrication Industry
Heat Exchangers