321 Stainless Steel is a standard austenitic 18/8 stainless steel grade, (304), but stabilized by Titanium. The titanium within means the stainless steel is intergranular corrosion resistant after heating, (between 425-900 degrees Celsius). Remarkably high strength as well as scaling resistance and phase stability set 321 Stainless Steel apart from other similar grades. This grade is not, however, recommended for welding consumable, as the titanium component does not allow good transfer of heat across a high temperature arc.
Chemistry CrNiMoCuTiCMnSiPSNFeMIN17.09.0––5x(C+N)––0.25––––MAX19.012.00.750.750.70.082.01.00.040.030.1Balance
Specifications
AMS 5510, AMS 5645 ASME SA 240, ASME SA 312, ASME SA 479 ASTM A 240, ASTM A 276, ASTM A 276 Condition A, ASTM A 276 Condition S, ASTM A 312, ASTM A 479 EN 1.4541 GE B50T1181, GE B50T12, GE B50T81 QQS 763, QQS 766d UNS S32100 Werkstoff 1.4541
Inventory
321 Stainless Steel Bars, 321 Stainless Steel Angle Bars, 321 Stainless Steel Flanges, 321 Stainless Steel Tubes & 321 Stainless Steel Pipe Fittings
Common Trade Names
321, 321 Stainless Steel, Alloy 321
Features
Oxidation resistant to 1600°F
Stabilized against weld heat affected zone (HAZ) intergranular corrosion
Resists polythionic acid stress corrosion cracking
Applications
Aircraft piston engine manifolds
Ball Valves
Thermal oxidizers
Refinery equipment
Stainless Steel tubes
Expansion joints
High temperature chemical process equipment
Physical Properties
Density: 0.286 lb/inch3 Melting Point: 2550 – 2600°FTemperature, °F2004008001000120014001600Coefficient* of Thermal Expansion, in/in°F x 10-69.39.410.010.310.610.911.1Thermal Conductivity Btu • ft/ft2 • hr • °F8.89.711.412.1–––Modulus of Elasticity, Dynamic psi x 10628.026.523.822.521.219.7–
Mechanical Properties
Average Elevated Temperature Tensile PropertiesTemperature, °F68400600800100012001400Ultimate Tensile Strength, ksi8462626259.545.527.50.2% Yield Strength, ksi3820.5181716.51614
Average Stress for RuptureTemperature, °F10501100115012001250130013501400145015001,000 hours, ksi–30–19–11.2–6.8–4.010,000 hours, ksi3123.517.312.99.77.25.44.03.052.3100,000 hours, ksi2316.5128.76.34.63.32.451.751.27
Average Stress for Secondary (minimum) Creep RateTemperature, °F10501100115012001250130013501400145015001% in 1,000 hours, ksi302013.18.85.83.852.551.71.130.751% 100,000 hours, ksi13.69.25.93.92.551.71.10.740.480.32
Electrical ResistivityTemperature, °F68212392752111214721652ohm circ mil/ft430470515600670725760
* 70°F to indicated temperature.
Source: wilsonpipeline Pipe Industry (www.wilsonpipeline.com)
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