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Stainless Steel 321

2018-09-21 13:43

STAINLESS STEEL 321

UNS S32100
ASTM A 240, A 479, A 276

321 Stainless is available in the following forms at Haohua Industry

Sheet
Plate
Bar
Pipe & Tube
Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
Weld Wire

321 Stainless Steel Overview

Stainless 321 is a heat resistant, titanium stabilized, austenitic alloy that's commonly used for service in the 1000°-1600°F temperature range. 321 stainless is primarily used in applications that involve continuous and intermittent service temperatures within the carbide precipitation range of 800°-1500°F. 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°F service conditions. In order to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking in service temperatures at 1500°-1650°F an air cool may be used.

What are the characteristics of 321 Stainless?

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

Stainless 321 Chemical 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

Temperature, °F	Ultimate Tensile Strength, ksi	.2% Yield Strength, ksi
68	84	38
400	62	20.5
600	62	18
800	62	17
1000	59.5	16.5
1200	45.5	16
1400	27.5	14

Welding Stainless Steel 321

321 Stainless is readily welded by all common methods including submerged arc. Appropriate weld fillers are most often specified as AWS E/ER 347 or E/ER 321.

This alloy is generally considered to have comparable weldability to 304 and 304L stainless with the main difference being the titanium addition which reduces or prevents carbide precipitation during welding.

*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.