321 Stainless Steel Round Bar / Hot Rolled Black Bar Cold Rolled Bright Stainless Steel Bar

321 Stainless Steel Bar

UNS S32100 (Grade 321)

321 stainless steel bar, also known as UNS S32100 and Grade 321, is primarily comprised of 17% to 19% chromium, 12% nickel, .25% to 1% silicon, 2% maximum manganese, traces of phosphorus and sulfur, 5 x (c + n) .70% titanium, with the balance being iron. With regards to corrosion resistance, 321 is equivalent to Grade 304 in the annealed condition and is superior if the application involves service in the 797° to 1652° F range. Grade 321 combines high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.

Grade 321 Stainless Steel Datasheet

The following tables and lists give grade 321 stainless steel datasheet and specification including chemical composition, physical properties and mechanical properties, machinability, heat treatment, welding, etc.

Chemical Composition

SS 321 stainless steel chemical composition is listed in the following table based on cast analysis.

AISI 321 Stainless Steel Properties

The tables below list AISI 321 stainless steel properties, including physical and mechanical properties.

Physical Properties

AISI 321 steel physical properties are given in the following lists, including density, thermal expansion, elastic modulus, thermal conductivity, specific heat capacity and electrical resistance.

Notes:

• 10-6·K-1 = 10-6/K
• 1 Ω·mm²/m = 1 μΩ·m
• 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
• 1 GPa = 1 kN/mm2
• 1 MPa = 1 N/mm2

Mechanical Properties

AISI 321 stainless steel mechanical properties are listed in the following tables.

Products partially or completely constructed of 321 include:

• Aircraft exhaust stacks
• Aircraft piston engine manifolds
• Chemical processing equipment
• Compensators and expansion bellows
• Expansion joints
• Furnace components
• High temperature chemical process equipment
• Jet engine parts
• Manifolds
• Refinery equipment
• Superheater and afterburner parts
• Thermal oxidizers
• Welded equipment

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