321 Stainless Steel Coil

321 stainless steel is a titanium stabilized grade commonly used for service in the 1000-1600 F degree temperature range. For service temperatures up to about 1600 F degree, a stabilizing treatment at 1550-1650 F degree, air cool, may be used to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking.

321 stainless is readily welded by all common methods including submerged arc. Appropriate weld fillers are AWS ER347 bare wire and E347 covered electrodes. 321 stainless is similar in machinability to 304 stainless steel. It has a machinability rating of 45% relative to AISI B1112.

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 degree 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 degree an air cool may be used.

Stainless 321 Chemical Composition, %

Coil size:

Thickness 0.5-12mm

Width 1000mm-2000mm

Surface finish: 2B, No.1

Characteristics of 321 Stainless

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

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.

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