321 Stainless Steel Round Bar | AMS 5645 | UNS S32100 | DIN 1.4541

1.4541 Round Bar Stockist, UNS S32100 Round Bar Distributor, ASTM A276 SS 321 Round Bar Exporter, Stainless Steel 321 Round Bar Supplier, SS 321 Round Bar Manufacturer.

PM Industries manufactures, supplies, and stocks 321 Stainless Steel Round Bar (UNS S32100). It's a titanium-stabilized austenitic stainless steel, with titanium added at a minimum of five times the carbon content. That titanium preferentially combines with carbon, preventing chromium carbide precipitation at grain boundaries during exposure to temperatures in the sensitization range of approximately 425°C to 815°C. The result is reliable resistance to intergranular corrosion in the heat-affected zone of welds and in components that operate continuously within that temperature range.

UNS S32100 Round Bar, 1.4541 Round Bar, Stainless Steel 321 Round Bar, SS 321 Round Bar.

321 serves the same sensitization problem that 304L and 316L address through low carbon content, but through a different mechanism. Where 304L and 316L reduce available carbon, 321 ties up that carbon with titanium. For applications that operate continuously within the sensitization temperature range over long service periods, the stabilization approach of 321 provides ongoing protection that low-carbon chemistry alone can't guarantee indefinitely. That's the specific service condition where 321 is the appropriate specification.

Intergranular corrosion resistance in elevated temperature service is 321's defining advantage. In exhaust systems, boiler components, heat exchanger tubing, and process equipment that operates continuously between 425°C and 815°C, carbide precipitation is an ongoing process that gradually depletes chromium at grain boundaries. Low-carbon grades slow that process but don't stop it. 321's titanium stabilization keeps the carbon tied up and unavailable for carbide formation throughout service, maintaining grain boundary integrity over long operating periods.

Thermal cycling resistance is good. The austenitic structure doesn't undergo phase transformations during heating and cooling, and the titanium stabilization prevents the microstructural changes that would otherwise accumulate through repeated thermal cycling. For exhaust manifolds, expansion joints, and process piping that cycle temperature repeatedly during operation, 321 maintains consistent properties over time.

Elevated temperature strength is adequate for many heat-related structural applications. 321 holds its mechanical properties better than 304 through the sensitization temperature range, which combined with its intergranular corrosion resistance makes it more reliable for long-duration heat service in fabricated structures.

Oxidation resistance up to approximately 870°C in continuous service covers most exhaust, boiler, and process heating applications. Above that temperature, higher-chromium grades like 310 or alloys with aluminum additions provide better oxidation protection.

Bar is available in a range of diameters and surface finishes with full material certification to ASTM A276, ASTM A479, and applicable specifications. Contact PM Industries for stock availability, dimensions, and pricing.

Specification 321 Stainless Round bar

Specification	ASTM, EN, DIN, JIS, BS, ASME, AISI
Condition	Hardened & tempered, annealed
Length	1 to 6 Meters, Custom Cut Lengths
Round Bars	Outside Diameter in the range of 4mm to 500mm above as per the customer requirement.
Bright Bars	Outside Diameter in the range of 4mm to 500mm above as per the customer requirement.
Hex Bars	18mm – 57mm (11/16″ to 2-3/4″) above as per the requirement.
Square Bars	18mm – 47mm (11/16″ to 1-3/4″) above as per the requirement.
Flat Bars	1/2” to 10” in thickness range of 2mm to 150mm
Finish	Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish
Technique	Hot Rolled, Cold Rolled, Cold Drawn, Forged Round Bar, Rod
Tolerance	H8, H9, H10, H11, H12, H13, K9, K10, K11, K12 or as per clients’ requirements
Test Certificates	EN 10204/3.1B, NACE MR0103, NACE MR0175
Raw Materials Certificate	100% Radiography Test Report
Inspection	Third Party Inspection Report, etc

Available Types

Equivalent Grades Stainless Steel 321 Round Bar

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

Chemical Composition of Stainless Steel 321 Round Bar

Grade	C	Mn	Si	P	S	Cr	N	Ni	Ti
SS 321	0.08 max	2.0 max	1.0 max	0.045 max	0.030 max	17.00 - 19.00	0.10 max	9.00 - 12.00	5(C+N) – 0.70 max

Mechanical Properties of Stainless Steel 321 Round Bar

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
8.0 g/cm3	1457 °C (2650 °F)	Psi – 75000 , MPa – 515	Psi – 30000 , MPa – 205	35 %

Size

US Bar		Metric		Japanese		Canadian/ASTM
Diameter (Inch)	Size of Bar	Diameter (milimeter)	size of Bar	Diameter (milimeter)	size of Bar	Diameter (milimeter2)	size of Bar
0.375	#3	5.5	5.5	10	10	200	15M
0.25	#2	5	5	6	6	100	10M
0.625	#5	7	7	16	16	500	25M
0.5	#4	6	6	13	13	300	20M
0.875	#7	9	9	22	22	1000	35M
0.75	#6	8	8	19	19	700	30M
1.125	#9	11	11	29	29	2500	55M
1	#8	10	10	25	25	1500	45M
1.375	#11	14	14	35	35
1.25	#10	12	12	32	32
1.625	#13	18	18	41	41
1.5	#12	16	16	38	38
1.875	#15	22	22	48	48
1.75	#14	20	20	44	44
2.25	#18	28	28	57	57
2	#16	25	25	51	51
		36	36
		32	32
		44	44
		40	40
		50	50

Condition

ANN	Annealed
H&T	Hardened and tempered.
PH	Precipitation hardened.

Finish

Bright drawn	BD	Slit rolled edge	SRE
Cold drawn	CD	Polished	P
Peeled and turned	P&T	Rough turned/peeled	RT
Cold finished	CF	Hot rolled pickled and annealed	HRAP
Centreless ground	CG	Hot finished	HF
Smooth turned	ST	reeled and Peeled	PR

Available Stock of 321 Stainless Round bar

Stainless Steel 321 Annealed Round Bar	SS 321 Shafting Round Bar
SS 321 Normalized Round Bar	1.4541 Automotive Round Bar
1.4541 Quenched & Tempered Round Bar	UNS S32100 Aerospace Round Bar
UNS S32100 Solution Annealed Round Bar	JIS SUS 321 Oil & Gas Round Bar
JIS SUS 321 Hardened Round Bar	EN X6Crniti18-10 Marine Round Bar
EN X6Crniti18-10 Bright Round Bar	ASTM A276 SS 321 Medical Grade Round Bar
ASTM A276 SS 321 Polished Round Bar	Stainless Steel 321 Hot Rolled Round Bar
Stainless Steel 321 Mirror Finish Round Bar	SS 321 Cold Drawn Round Bar
SS 321 Pickled & Passivated Round Bar	1.4541 Cold Rolled Round Bar
1.4541 Coated / Plated Round Bar	UNS S32100 Forged Round Bar
UNS S32100 Commercial Round Bar	JIS SUS 321 Peeled Round Bar
JIS SUS 321 Precision Round Bar	EN X6Crniti18-10 Turned Round Bar
EN X6Crniti18-10 Straight Length Round Bar	ASTM A276 SS 321 Ground Round Bar
ASTM A276 SS 321 Cut-to-Length Round Bar	Stainless Steel 321 Centreless Ground Round Bar
Stainless Steel 321 Structural Round Bar	SS 321 Precision Ground Round Bar