321/321H (1.4541)

Alloy 321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture properties than alloys 304 and 304L. It also possesses good low temperature toughness.

Alloy 321H (UNS S 32109) is the higher carbon (0.04 – 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the plate enables dual certification.

Alloy 321 cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.

Grade		Cr	Ni	C	Si	Mn	P	S	N	Ti	Fe
321	Min	17.0	9.0	-	-	-	-	-	-	5*(C+N)	Bal
	Max	19.0	12.0	0.08	0.75	2.0	0.045	0.03	0.10	0.70	Bal
321H	Min	17.0	9.0	0.04	18.0	-	-	-	-	5*(C+N)	Bal
	Max	19.0	12.0	0.10	20.0	2.0	0.045	0.03	0.10	0.070	Bal

Common Applications

• Aerospace – piston engine manifolds
• Chemical Processing
• Expansion Joints
• Food Processing – equipment and storage
• Petroleum Refining – polythionic acid service
• Waste Treatment – thermal oxidizers