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Stainless Steel 321

Material: AISI 321, UNS S32100, 1.4541

Type: Pipes
Plates
Bars
Fittings
Forgings
Flanges
Prefabrication

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Stainless Steel 321 Features：

Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilized by Titanium (321) or Niobium (347) additions. These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850 °C. Grade 321 is the grade of choice for applications in the temperature range of up to about 900 °C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.

Stainless Steel 321 Chemical Composition

Grade	UNS	C≤	Mn	P≤	S≤	Si≤	Cr	Mo	Ni
321	S32100	0.08	2	0.045	0.03	0.75	17.0-19.0	-	9.0-12.0

Stainless Steel 321 Mechanical Properties

Grade	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)	Hardness, HB（max）
321H	75【515】	30【205】	40	217

Stainless Steel 321 Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS	JIS	EN
321	1.4541	S32100	SUS321	X6CrNiTi18-10

Stainless Steel 321 ASTM Specification

Pipe, SMLS& Welded	Tube, SMLS& Welded	Tube , Seamless	Sheet/Plate	Bar /Rod	Forging /Flange	BW Fittings
ASTM A312	ASTM A269	ASTM A213	ASTM A240	ASTM A276/A479	ASTM A182	ASTM A403

Stainless Steel 321 Applications

Annealing covers
High-temp tempering equipment
Chemical processing equipment
Automotive exhaust systems
Firewalls
Boiler casings
Aircraft exhaust stacks and manifolds
Superheaters
Gas and oil refinery equipment

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