321 stainless steel data sheet

Type 321 Stainless Steel Data Sheet

UNS Number: S32100
EN Standard: 1.4541
Common Trade Names: 321 SS, 321 Stainless Steel

321 Stainless Steel plates Professional Supplier-GNEE

1. Chemical Composition (Weight %)

Element	Min	Max
Carbon (C)	-	0.08
Chromium (Cr)	17.0	19.0
Nickel (Ni)	9.0	12.0
Titanium (Ti)	5×C%	0.70
Manganese (Mn)	-	2.0
Silicon (Si)	-	1.0
Phosphorus (P)	-	0.045
Sulfur (S)	-	0.030
Iron (Fe)	Balance	Balance

2. Mechanical Properties (Solution Annealed)

Property	Value	Test Standard
Tensile Strength	≥520 MPa (75 ksi)	ASTM A240/A240M
Yield Strength	≥205 MPa (30 ksi)	ASTM A240/A240M
Elongation at Break	≥40%	ASTM A240/A240M
Hardness (Rockwell)	≤92 HRB	ASTM E18

3. Physical Properties

Property	Value	Unit
Density	7.9 g/cm³ (0.29 lb/cu.in.)	g/cm³
Melting Point	1398–1427°C (2550–2600°F)	°C
Thermal Conductivity	15 W/m·K	W/m·K
Coefficient of Thermal Expansion (20–100°C)	16.0×10⁻⁶	μm/m·°C
Electrical Resistivity	0.73 μΩ·m	μΩ·m
Modulus of Elasticity	200 GPa (29,000 ksi)	GPa

4. Corrosion Resistance

Intergranular Corrosion:

Excellent resistance due to titanium stabilization (prevents chromium carbide precipitation).

Welded components do not require post-weld annealing.

Oxidation Resistance:

Continuous service up to 925°C (1700°F).

Pitting/Slcrevice Corrosion:

Moderate resistance; comparable to 304/304L stainless steel.

5. Heat Treatment

Solution Annealing:

Heat to 950–1120°C (1740–2050°F), quench in water.

Stabilization Annealing (Optional):

870–900°C (1598–1652°F) for 1 hour per 25 mm thickness, air-cooled.

6. Welding Recommendations

Processes: TIG, MIG, SMAW, Submerged Arc Welding (SAW), Laser.

Filler Metal: AWS ER347 (matching Nb-Ta content).

Preheat/Post-Weld: Not required; avoid excessive heat input.

7. Applications

Aerospace components (e.g., jet engine parts)

Heat exchangers, boilers, and pressure vessels

Chemical processing equipment

Nuclear reactor parts

Automotive exhaust systems

High-temperature fasteners