321

APPLICATIONS

Aircraft collector rings, exhaust stacks, carburetor air intensifier tubes, exhaust manifolds, flexible couplings, jet engine parts, mufflers, pressure vessels, tubing, fasteners, flexible metal hose and bellows

DESCRIPTION

Type 321 is an austenitic chromium-nickel stainless steel containing Titanium which is recommended for parts fabricated by welding which cannot subsequently be annealed. Type 321 is a stabilized austenitic stainless steel similar to type 304 but with a titanium addition. This titanium addition reduces or prevents carbide precipitation during welding and in 800 - 1500 °F (427 - 816 °C) service. It also improves the elevated temperature properties of the alloy. Type 321 provides excellent resistance to oxidation and corrosion and possesses good creep strength.

CHEMISTRY TYPICAL

Carbon: 0.08 max
Manganese: 2.00 max
Silicon: 0.75 max
Chromium: 17.00-19.00
Nickel: 9.00-12.00
Molybdenum: 0.75 max
Phosphorus: 0.045 max
Sulfur: .030 max
Copper: 0.75 max
Nitrogen: .010 max
Titanium: 5x (Carbon+ Nitrogen) min-0.70 max
Iron: Balance

PHYSICAL PROPERTIES

Density: 0.29 lbs/in3 9.01 g/cm3

Electrical Resistivity: microhm-in (microhm-cm): 68 °F (20 °C): 28.4 (72)

Specific Heat: BTU/lb/°F (kJ/kg•K):
32 - 212 °F (0 - 100 °C): 0.12 (0.50)

Thermal Conductivity: BTU/hr/ft2/ft/°F (W/m•K):
At 212 °F (100 °C): 9.3 (16.0)
At 932 °F (500 °C): 12.8 (22.0)

Mean Coefficient of Thermal Expansion: in/in/°F (µm/m•K)
32 - 212 °F (0 - 100 °C): 9.2 x 10·6 (16.6)
32 - 600 °F (0- 315 °C): 9.5 x 10·6 (17.1)
32 - 1000 °F (0 - 538 °C): 10.3 x 10·6 (18.5)
32 - 1200 °F (0 - 649 °C): 10.7 x 10·6 (19.3)
32 - 1500 °F (0 - 873 °C): 11.2 x 10·6 (20.2)

Modulus of Elasticity: ksi (MPa)
28 x 103 (193 x 103) in tension
11 .2 x 103 (78 x 103) in torsion

Magnetic Permeability: H = 200 Oersteds: Annealed < 1.02 max
Melting Range: 2500 - 2550 °F (1371 - 1400 °C)

FORMS

Coil - Strip, Foil, Ribbon Wire - Profile, Round, Flat, Square

MECHANICAL PROPERTIES AT ROOM TEMPERATURE PROPERTIES: ANNEALED

Ultimate Tensile Strength: 75 KSI min (515 MPa min)
Yield Strength (0.2% Offset): 30 KSI min (250 MPa min)
Elongation: 40% min
Hardness: Rb 95 max

PROPERTIES: TEMPERED

Type 321 can be cold rolled to various tempers. Contact Ulbrich Technical Services for additional information.

321 Stainless Steel UNS S32100

StaHot Rolled 3mm SUS321 S32