Is 321 stainless steel magnetic?

In the annealed state, 321 is non-magnetic, but slight magnetism may appear after cold working.

What is the maximum service temperature for 321?

It is generally used up to 870 °C (1600 °F) for oxidation resistance, and up to 925 °C (1700 °F) for intermittent service.

Why choose 321 instead of 304?

321 provides better resistance to intergranular corrosion at high temperatures due to its titanium stabilization.

Stainless Steel 321

Material Type：Metal
Material Name：Stainless Steel 321
Alternative Names：UNS S32100 | EN 1.4541 | ASTM A240
Process Compatibility：CNC Milling, CNC Turning, Welding, Heat Treatment

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Description

Stainless Steel 321 is an austenitic stainless steel stabilized with titanium.The addition of titanium improves resistance to intergranular corrosion after welding or exposure to high temperatures. It retains excellent strength and oxidation resistance up to about 870 °C (1600 °F), making it especially suitable for aerospace and heat treatment applications.

Lead Time:	< 10 days
Wall Thickness:	0.75 mm
Tolerances:	±0.005″ (±0.125mm)
Max Part Size:	200 cm x 80 cm x 100 cm

Classification of Metal Performance Parameters

Mechanical Properties	Ultimate Tensile Strength	750
	Yield Strength	300
	Young’s Modulus / Elasticity	200
	Elongation at Break	40
	Hardness	HB 180
	Fatigue Strength	240
Physical Properties	Density	7.9
	Corrosion Resistance	Good
	Magnetism	Non-magnetic
	Weldability	Good
	Impact Toughness	Moderate
Thermal Properties	Maximum Service Temperature	870
	Thermal Expansion Coefficient	17.3
	Thermal Conductivity	16.2
	Creep Resistance	Moderate
Electrical Properties	Electrical Resistivity	72
	Electrical Conductivity	3
	Dielectric Strength	N/A
Processing & Surface Treatment	Machinability	Fair
	Surface Finish Compatibility	Good
	Formability	Good
Special Properties	Biocompatibility	Yes
	Flame Retardancy	Yes
	UV Resistance	Moderate
	Recyclability	Yes

Introduction to Stainless Steel 321

What

Stainless Steel 321 (UNS S32100) is a titanium-stabilized austenitic stainless steel. It was developed to overcome the problem of carbide precipitation during welding or prolonged heating. The titanium forms stable carbides, preventing chromium depletion at the grain boundaries, which improves resistance to intergranular corrosion. This makes 321 a preferred choice for components exposed to continuous high heat, such as exhaust systems and furnace parts.

Advantages

Superior resistance to intergranular corrosion after welding
Retains mechanical strength at high temperatures (up to ~870 °C)
Good oxidation and creep resistance
Stable microstructure under prolonged heating

Applications

Aircraft exhaust manifolds
Furnace linings and heat exchangers
Chemical processing equipment
Expansion joints and bellows

FAQ

Q Is 321 stainless steel magnetic?

A
In the annealed state, 321 is non-magnetic, but slight magnetism may appear after cold working.
Q What is the maximum service temperature for 321?

A
It is generally used up to 870 °C (1600 °F) for oxidation resistance, and up to 925 °C (1700 °F) for intermittent service.
Q Why choose 321 instead of 304?

A
321 provides better resistance to intergranular corrosion at high temperatures due to its titanium stabilization.

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Stainless Steel 321

Introduction to Stainless Steel 321

FAQ

Q Is 321 stainless steel magnetic?

Q What is the maximum service temperature for 321?

Q Why choose 321 instead of 304?

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