Stainless Steel 904L is a high-alloy austenitic stainless steel specifically engineered for exceptional corrosion resistance in acidic and chloride-rich environments. With superior resistance to pitting, crevice corrosion, and stress corrosion cracking, 904L is widely used in chemical processing equipment, pharmaceutical machinery, marine components, and high-purity applications. Its low carbon and high alloy content minimize carbide precipitation during welding, ensuring structural integrity and long-term reliability. Offering an excellent combination of corrosion protection, durability, and high-performance under harsh conditions, Stainless Steel 904L is the ideal choice for demanding industrial and marine environments.
Forged stainless steel 904L bars for high-load applications
Enhanced strength through controlled forging and heat treatment
Material grade: UNS N08904 / DIN 1.4539
Widely used in valves, pumps, shafts, and heavy engineering
904L STAINLESS STEEL ROUND BAR EQUIVALENT GRADES
STANDARD
UNS
WNR.
JIS
BS
KS
AFNOR
EN
SS 904L
N08904
1.4539
SUS 904L
904S13
STS 317J5L
Z2 NCDU 25-20
X1NiCrMoCu25-20-5
SPECIFICATION OF STAINLESS STEEL 904L ROUND BAR
Stainless Steel Round Bar Specification
ASTM A276 / A479, ASME SA276 / A479
Dimension Standard
EN, DIN, JIS, ASTM, BS, ASME, AISI
Size
14 mm – 300 mm
Thickness
50 mm to 6000 mm Long
Length
1 to 6 Meters, Custom Cut Length
Form
Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc.
CHEMICAL COMPOSITION OF STAINLESS STEEL 904L ROUND BAR
Grade
C %
Mn %
Si %
P %
S %
Cr %
Ni %
Mo %
Cu %
904L
0.02 max
2.00 max
1.00 max
0.045 max
0.035 max
19.0 – 23.0
23.0 – 28.0
4.0 – 5.0
1.0 – 2.0
MECHANICAL PROPERTIES OF STAINLESS STEEL 904L ROUND BAR
Grade
Tensile Strength (MPa) min
Yield Strength 0.2% Proof (MPa) min
Elongation (% in 50 mm) min
Hardness Rockwell B (HRB)
Hardness Brinell (HB)
904L
490
220
36
70–90 (typical)
150 max
💡 Practical Difference in Use
Use Stainless Steel 904L Round Bars when: superior corrosion resistance, especially against acids and chlorides, moderate hardness, and long-term durability are required. SS 904L is a high-alloy austenitic stainless steel with excellent resistance to pitting and crevice corrosion, making it ideal for chemical, pharmaceutical, and marine environments.
→ Example: chemical processing equipment, heat exchangers, pump parts, valve components, marine fittings, shafts, and industrial machinery exposed to harsh corrosive conditions.
Heat Treated / Bright Finished Stainless Steel 904L Round Bars when: consistent surface finish, dimensional stability, and improved machining characteristics are required for precision components. Bright drawn or ground bars provide tight tolerances and smooth surfaces while maintaining excellent corrosion resistance.
→ Example: polished pump shafts, CNC machined parts, valve sleeves, pharmaceutical equipment components, and high-precision marine or chemical assemblies.
Applications of Stainless Steel 904L Round Bars
Stainless Steel 904L round bars are widely used in chemical, pharmaceutical, marine, and precision equipment industries where superior corrosion resistance and reliability are critical.
Chemical & Pharmaceutical: Pumps, valves, reactors, corrosion-resistant machinery parts.
Marine & Offshore: Shafts, fasteners, structural components exposed to seawater.
High-Purity Applications: Equipment for acids, chlorides, and high-hygiene environments.
When to Choose Stainless Steel 904L Round Bars?
The selection mainly depends on corrosion exposure, chemical resistance, surface finish, and dimensional precision.
Choose SS 904L Round Bars when:
Extreme resistance to acids and chlorides is required
Moderate hardness is sufficient
Long-term durability in corrosive environments is important
Components operate in chemical, pharmaceutical, or marine settings
Good weldability and polishability are needed
Used in high-corrosion industrial or marine equipment
SS 904L Bright / Ground Round Bars are preferred when:
Fine surface finish and tight tolerances are required
Precision machining and CNC production are involved
Corrosion resistance must be maintained on visible or contact surfaces
Polished appearance is important for high-purity or exposed parts
Stable dimensional accuracy is critical
Used in chemical, pharmaceutical, or marine precision assemblies
Industries That Use Stainless Steel 904L Round Bars
SS 904L is preferred in industries where high corrosion resistance, smooth surface finish, and moderate hardness are critical.
Chemical & Pharmaceutical Equipment
Used in aggressive chemical and acidic environments.
Uses
Pump shafts, valve components, chemical reactors.
Why SS 904L?
Exceptional resistance to acids and chlorides.
Marine & Offshore Industry
Used in saltwater-exposed machinery.
Uses
Shafts, fasteners, marine fittings.
Why SS 904L?
Outstanding corrosion resistance in seawater.
High-Purity Applications
Used in high-hygiene and chemical-resistant assemblies.
