904L Stainless Steel Round Bar | UNS N08904 | DIN 1.4539

Stainless Steel 904L Round Bar Supplier, ASTM A276 SS 904L Round Bar Stockist, UNS N08904 Round Bar Distributor, SS 904L Round Bar Manufacturer, 1.4539 Round Bar Exporter.

PM Industries manufactures, supplies, and stocks 904L Stainless Steel Round Bar (UNS N08904). It's a high-alloy austenitic stainless steel with approximately 20% chromium, 25% nickel, 4.5% molybdenum, and 1.5% copper, with low carbon content. That composition places 904L in a performance bracket well above standard 316L and 317L, and comparable to some nickel alloys in specific corrosive environments. The copper addition is a distinguishing feature, providing useful resistance in reducing acid environments, particularly dilute sulfuric acid, where molybdenum-bearing grades without copper show higher corrosion rates.

1.4539 Round Bar, Stainless Steel 904L Round Bar, SS 904L Round Bar, UNS N08904 Round Bar.

904L fills a practical gap between standard austenitic stainless grades and more expensive nickel alloys like Hastelloy C-276 or Incoloy 825. In many corrosive service applications where 316L has proven inadequate but the full cost of premium nickel alloys isn't justified, 904L provides sufficient corrosion resistance at a lower alloy cost. That position has kept it in active specification in sulfuric acid, phosphoric acid, and mixed acid chemical service for many years.

Sulfuric acid resistance is the application where 904L most clearly demonstrates its advantage over 316L and 317L. In dilute to moderately concentrated sulfuric acid at temperatures that cause significant attack on standard stainless grades, 904L maintains much lower corrosion rates. The copper addition contributes meaningfully to that performance in reducing acid conditions. Chemical plant equipment, acid handling systems, and process vessels in sulfuric acid service regularly specify 904L specifically for that resistance.

Stress corrosion cracking resistance is good, substantially better than standard austenitic grades in hot chloride environments. The high nickel content of approximately 25% places 904L well above the threshold where austenitic stainless steels show practical resistance to chloride SCC, which matters in heat exchangers and process vessels operating with hot chloride-containing process streams.

Pitting resistance, while better than 316L due to higher molybdenum content, is not in the same bracket as super duplex or 6Mo super austenitic grades. For the most aggressive seawater pitting environments or concentrated chloride service at elevated temperatures, S32750 or SMO 254 provide better localized corrosion resistance. Within moderate chloride service combined with acid exposure, 904L performs reliably.

Low carbon content ensures that welded fabrications maintain corrosion resistance through the heat-affected zone without post-weld annealing. For fabricated vessels, heat exchangers, and piping systems in corrosive chemical service, that behavior is expected and relied upon in design.

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 904l Stainless Steel 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 904L Round Bar

STANDARD	WERKSTOFF NR.	UNS	JIS	BS	KS	AFNOR	EN
SS 904L	1.4539	N08904	SUS 904L	904S13	STS 317J5L	Z2 NCDU 25-20	X1NiCrMoCu25-20-5

Chemical Composition of Stainless Steel 904L Round Bar

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	Cu
SS 904L	0.020 max	2.00 max	1.00 max	0.040 max	0.030 max	19.00 – 23.00	4.00 – 5.00 max	23.00 – 28.00	1.00 – 2.00

Mechanical Properties of Stainless Steel 904L Round Bar

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
7.95 g/cm3	1350 °C (2460 °F)	Psi – 71000 , MPa – 490	Psi – 32000 , MPa – 220	35 %

904L Stainless Steel Round Bar 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 904l Stainless Steel Round bar

Stainless Steel 904L Annealed Round Bar	BS 904S13 Shafting Round Bar
SS 904L Normalized Round Bar	Afnor Z2 Ncdu 25-20 Automotive Round Bar
ASTM A276 SS 904L Quenched & Tempered Round Bar	EN X1Nicrmocu25-20-5 Aerospace Round Bar
UNS N08904 Solution Annealed Round Bar	Stainless Steel 904L Oil & Gas Round Bar
1.4539 Hardened Round Bar	SS 904L Marine Round Bar
JIS SUS 904L Bright Round Bar	ASTM A276 SS 904L Medical Grade Round Bar
BS 904S13 Polished Round Bar	UNS N08904 Hot Rolled Round Bar
Afnor Z2 Ncdu 25-20 Mirror Finish Round Bar	1.4539 Cold Drawn Round Bar
EN X1Nicrmocu25-20-5 Pickled & Passivated Round Bar	JIS SUS 904L Cold Rolled Round Bar
Stainless Steel 904L Coated / Plated Round Bar	BS 904S13 Forged Round Bar
SS 904L Commercial Round Bar	Afnor Z2 Ncdu 25-20 Peeled Round Bar
ASTM A276 SS 904L Precision Round Bar	EN X1Nicrmocu25-20-5 Turned Round Bar
UNS N08904 Straight Length Round Bar	Stainless Steel 904L Ground Round Bar
1.4539 Cut-to-Length Round Bar	SS 904L Centreless Ground Round Bar
JIS SUS 904L Structural Round Bar	ASTM A276 SS 904L Precision Ground Round Bar