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321 Stainless Steel

321 stainless steel, available from Solitaire Steel & Engineering LLP, Khetwadi, Mumbai, India, is a titanium-stabilized austenitic stainless steel known for its superior resistance to intergranular corrosion and strength in high-temperature environments. The titanium addition enhances resistance to chromium carbide precipitation, making it ideal for prolonged use at elevated temperatures of 800-1500°F. This material performs well in applications where stability and durability are essential, such as in aircraft, furnace parts, and heat exchangers.

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Chemical Composition of 321 Stainless Steel

Element	Content (%)
Carbon (C)	≤ 0.08
Chromium (Cr)	17.0 – 19.0
Nickel (Ni)	9.0 – 12.0
Manganese (Mn)	≤ 2.0
Silicon (Si)	≤ 0.75
Phosphorus (P)	≤ 0.045
Sulfur (S)	≤ 0.03
Titanium (Ti)	5(C+N) min – 0.70 max
Nitrogen (N)	≤ 0.10
Iron (Fe)	Balance

Technical Specifications of 321 Stainless Steel

Physical Properties

Property	Metric	Imperial
Density	7.90 g/cm³	0.286 lb/in³
Modulus of Elasticity	193 GPa	28.0 x 10⁶ psi
Thermal Expansion	16.6 µm/m°C (0-100°C)	9.2 x 10⁻⁶ in/in°F
Thermal Conductivity	16.1 W/m·K	9.3 BTU/hr·ft·°F
Specific Heat Capacity	500 J/kg·K	0.12 BTU/lb·°F
Electrical Resistivity	72 µΩ·cm	28.4 µΩ·in

Mechanical Properties

Property	Metric	Imperial
Tensile Strength	515 MPa	75,000 psi
Yield Strength	205 MPa	30,000 psi
Elongation at Break	40%	40%
Hardness (Rockwell B)	≤ 95	≤ 95

Electrical Properties

Property	Metric	Imperial
Electrical Resistivity	72 µΩ·cm	28.4 µΩ·in

Thermal Properties

Property	Metric	Imperial
Thermal Conductivity (at 100°C)	16.1 W/m·K	9.3 BTU/hr·ft·°F
Specific Heat Capacity	500 J/kg·K	0.12 BTU/lb·°F
Coefficient of Thermal Expansion	16.6 µm/m°C (0-100°C)	9.2 µin/in·°F

321 Stainless Steel Product Specifications by Solitaire Steel & Engineering LLP

Product Type	Standards	Sizes	Types	Applications
Sheets & Plates	ASTM A240, A480	Thickness: 1.5mm – 100mm	Hot Rolled, Cold Rolled	Aircraft manifolds, heat exchangers
Pipes & Tubes	ASTM A312, A213	Diameter: 6mm – 1200mm	Seamless, Welded	Chemical processing, flue gas desulfurization
Bars	ASTM A276, A479	Diameter: up to 150mm	Round, Square, Hex	Construction, heat-resistant applications
Angles, Channels, Beams	ASTM A484	Custom sizes available	L-Angles, U-Channels, I-Beams	Structural, architectural, high-temp applications
Fittings	ASTM A403	Size: 1/2″ – 72″	Buttweld, Socket Weld	Piping systems, cryogenic processing

Processing and Fabrication Properties of 321 Stainless Steel

Forming: Easily formed by hot and cold processes; avoid bending if exposed to high temperatures over time.
Welding: Compatible with all standard welding methods, including TIG, MIG, and arc welding; filler metals are necessary due to titanium.
Machining: Work-hardened; slow speeds and lubrication help prevent material hardening.
Heat Treatment: Solution annealing at 950 – 1120°C followed by rapid cooling; stabilizing at 870-900°C enhances performance for severe service conditions.
Heat Resistance: Oxidation-resistant for intermittent service up to 900°C and continuous up to 925°C.

Applications of 321 Stainless Steel

Due to its high-temperature stability and resistance to carbide precipitation, 321 stainless steel is ideal for:

High-Temperature Industrial Equipment: Furnaces, heat exchangers, expansion joints
Petrochemical & Chemical Processing: Used in equipment requiring stable high-temperature performance
Food Processing Equipment: Good resistance to acidic environments
Power Generation: Used in heat-resistant structures and exhaust systems

321 Stainless Steel vs. 304 Stainless Steel

While both grades offer excellent corrosion resistance, 321 outperforms 304 in high-temperature applications due to its titanium stabilization, which prevents chromium carbide precipitation, making it ideal for prolonged high-temperature usage.