Stainless 321 is a heat resistant, titanium stabilized, austenitic alloy that's commonly used for service in the 1000-1600 temperature range. 321 stainless is primarily used in applications that involve continuous and intermittent service temperatures within the carbide precipitation range of 800-1500. Type 321 is similar to type 304 stainless but with a titanium addition of at least five times the carbon content. This titanium addition reduces or prevents carbide precipitation during welding and in the 800-1500 service conditions. In order to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking in service temperatures at 1500-1650 an air cool may be used.

 

 

 

What are the characteristics of 321H stainless steel ?

• Oxidation resistant to 1600
• Stabilized against weld heat affected zone (HAZ) intergranular corrosion
• Resists polythionic acid stress corrosion cracking

 

 

Stainless 321Hchemical composition%^

	Cr	Ni	Mo	Cu	Ti	C
MIN	17.0	9.0	-	-	5x(C+N)	-
MAX	19.0	12.0	0.75	0.75	0.70	0.08
	Mn	Si	P	S	N	Fe
MIN	-	0.25	-	-	-	-
MAX	2.0	1.0	0.04	0.03	0.1	Bal

 

 

What applications might 321 Stainless Steel be used?

• Aircraft piston engine manifolds and exhaust stacks
• Expansion joints
• Thermal oxidizers
• Refinery equipment
• High temperature chemical process equipment

 

Mechanical Properties
Average Elevated Temperature Tensile Properties