Material Grade

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