Stainless Steel 304L Round Bar | AMS 5647 | UNS S30403 | DIN 1.4307

Stainless Steel 304L Round Bar Supplier, ASTM A276 SS 304L Round Bar Manufacturer, SS 304L Round Bar Stockist, UNS S30403 Round Bar Distributor, 1.4306 Round Bar Exporter

PM Industries manufactures, supplies, and stocks 304L Stainless Steel Round Bar (UNS S30403). It's the low-carbon version of the standard 304 austenitic stainless steel, with carbon held to 0.03% maximum compared to 0.08% maximum in standard 304. That lower carbon content is what makes 304L the preferred specification for welded fabrications. During welding, standard 304 can sensitize in the heat-affected zone, where carbon combines with chromium to form carbides at grain boundaries, reducing corrosion resistance in those areas. With 304L's low carbon content, that carbide precipitation is minimized, maintaining corrosion resistance through the weld zone without requiring post-weld annealing.

Stainless Steel 304L Round Bar, ASTM A276 SS 304L Round Bar, ASME A479 SS 304L Round Bar, UNS S30403 Round Bar.

In current practice, most 304L material also meets 304 mechanical property requirements and is dual-certified. That dual certification covers both grades with a single heat of material, which simplifies procurement and inventory management for fabricators who may need either grade depending on the application.

Weld zone corrosion resistance is the clearest practical advantage of 304L over standard 304. In fabricated vessels, piping systems, structural assemblies, and process equipment that will be welded and then exposed to corrosive service, the low carbon content ensures the heat-affected zone doesn't become a weak point in the corrosion barrier. That matters in food processing equipment, pharmaceutical vessels, water treatment systems, and chemical plant fabrications where consistent corrosion resistance through every weld is a basic requirement.

Corrosion resistance in atmospheric and mild chemical service is good and well proven over decades of widespread use. 304L handles moisture, humidity, many organic acids, food-grade chemicals, and mild industrial environments without significant attack. For more aggressive environments containing chlorides, concentrated acids, or elevated temperatures, 316L or higher-alloy grades provide better protection.

Cryogenic toughness is maintained through the full temperature range down to liquid nitrogen temperatures. The austenitic structure doesn't undergo a ductile-to-brittle transition the way ferritic and martensitic stainless steels do at low temperatures, making 304L a practical choice for cryogenic storage vessels, piping, and structural components.

Non-magnetic behavior in the annealed condition is useful in applications where magnetic interference is a concern, including medical devices, certain electronic assemblies, and scientific equipment. Cold working will induce some magnetic response, so the degree of cold work in the finished bar matters for applications where magnetic permeability is a hard requirement.

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

SpecificationStainless Steel 304L 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

Stainless Steel 304L Round Bar Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N
SS 304L	0.035 max	2 max	1.0 max	0.045 max	0.030 max	18 – 20	–	8 – 13	–

Stainless Steel 304L Round Bar Mechanical Properties

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
8.0 g/cm3	1400 °C (2550 °F)	Psi – 75000 , MPa – 515	Psi – 30000 , MPa – 205	35 %

Stainless Steel Equivalent Grades for 304L Round Bar

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	GOST	AFNOR	EN
SS 304L	1.4306/1.4307	S30403	SUS 304L	3304S11	03Х18Н11	Z3CN18‐10	X2CrNi18-9 / X2CrNi19-11

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 Stainless Steel 304L Round Bar

Stainless Steel 304L Annealed Round Bar	1.4306 Shafting Round Bar
ASTM A276 SS 304L Normalized Round Bar	X2Crni19-11 Automotive Round Bar
ASME A479 SS 304L Quenched & Tempered Round Bar	JIS SUS 304L Aerospace Round Bar
UNS S30403 Solution Annealed Round Bar	Stainless Steel 304L Oil & Gas Round Bar
BS 304S11 Hardened Round Bar	ASTM A276 SS 304L Marine Round Bar
EN 58E Bright Round Bar	ASME A479 SS 304L Medical Grade Round Bar
1.4306 Polished Round Bar	UNS S30403 Hot Rolled Round Bar
X2Crni19-11 Mirror Finish Round Bar	BS 304S11 Cold Drawn Round Bar
JIS SUS 304L Pickled & Passivated Round Bar	EN 58E Cold Rolled Round Bar
Stainless Steel 304L Coated / Plated Round Bar	1.4306 Forged Round Bar
ASTM A276 SS 304L Commercial Round Bar	X2Crni19-11 Peeled Round Bar
ASME A479 SS 304L Precision Round Bar	JIS SUS 304L Turned Round Bar
UNS S30403 Straight Length Round Bar	Stainless Steel 304L Ground Round Bar
BS 304S11 Cut-to-Length Round Bar	ASTM A276 SS 304L Centreless Ground Round Bar
EN 58E Structural Round Bar	ASME A479 SS 304L Precision Ground Round Bar