Stainless Steel 304L Round Bar
➡️ SS 304L | UNS S30403 | EN 1.4307
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Stainless Steel
UNS Number:
S30403
Wr. No.:
1.4307
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel 304L Round Bar
Stainless Steel 304L Round Bar is round bar in austenitic chromium-nickel stainless steel grade 304L, carrying the designations UNS S30403 and W.Nr. 1.4307. Bar is made to ASTM A276 / A276M, and diameter tolerance, straightness and surface condition follow ASTM A484 / A484M. EN, JIS, GB/T and KS all carry an equivalent designation.
The grade contains approximately 18% chromium and 8-12% nickel with carbon restricted to 0.030% maximum. The low carbon level limits chromium carbide precipitation at grain boundaries during welding, so the bar resists intergranular corrosion in the as-welded condition without post-weld annealing. Corrosion performance in atmospheric, food-processing, water and many mild chemical environments matches standard 304, while strength is slightly lower.
Bar leaves the mill in the solution annealed (Condition A, +AT) condition. Depending on the tolerance and surface a job needs, it can be hot finished, cold drawn, peeled, rough or smooth turned, centreless ground or polished. Diameters from 3 mm to 500 mm are usual, with larger sizes forged to order, in random 3 to 6 m lengths or cut to length. The grade cannot be hardened by heat treatment; higher strength is obtained only through cold working.
Work done in this grade includes shafts, fasteners, fittings and welded machined components, mostly for the food and beverage, pharmaceutical, water treatment, chemical processing and general engineering industries. Material normally ships against an EN 10204 3.1 certificate showing heat analysis, mechanical results and delivery condition. In the annealed condition the steel is non-magnetic, though cold work can leave it slightly magnetic. Density is around 8.00 g/cm3 and the modulus of elasticity about 193 GPa.
Common Applications of Stainless Steel 304L Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for SS 304L Round Bar
Standard
Country / Region
Grade
ASTM A276 / A276M, ASTM A479 / A479M
USA
Type 304L (UNS S30403)
ASME SA-479
USA
Type 304L (UNS S30403)
EN 10088-3
Europe / EU
1.4307 (X2CrNi18-9), 1.4306 (X2CrNi19-11)
BS EN 10088-3
United Kingdom
1.4307 (X2CrNi18-9), 1.4306 (X2CrNi19-11)
JIS G4303
Japan
SUS304L
GB/T 1220
China
022Cr19Ni10 (S30403)
KS D 3706
South Korea
STS304L
ISO 15510
International
X2CrNi18-9
Technical Specification for Stainless Steel 304L Round Bar
Specification
Value
Unit
Material
Stainless Steel
-
Grade
304L / UNS S30403 / W.Nr. 1.4307
-
Product Form
Round Bar / Rod
-
Standard
ASTM A276 / A276M and ASTM A479 / A479M
-
Diameter
3 - 500
mm
Length
3 - 6 (random mill length) or cut to length
m
Manufacturing Process
Hot rolled, forged or cold finished
-
Production Route
EAF + AOD / VOD refining, continuous cast or ingot, hot rolled or forged
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Heat Treatment / Delivery Condition
Solution annealed (condition a, +at)
-
Tolerance Standard
ASTM A484 / A484M
-
Carbon Equivalent (CEV)
Not applicable
-
Density
8.00
g/cm3
Melting Range
1400 - 1450
C
Thermal Conductivity at 100 C
16.2
W/m.K
Coefficient of Thermal Expansion (0-100 C)
17.3
10-6/K
Specific Heat (0-100 C)
500
J/kg.K
Electrical Resistivity at 20 C
0.72
micro-ohm.m
Modulus of Elasticity at 20 C
193
GPa
Magnetic Properties
Non-magnetic in the solution annealed condition, slight magnetism may develop after cold work
-
Applicable Testing / Inspection Standard
ASTM A370 (mechanical testing), ASTM E112 (grain size, where required), ASTM A262 (intergranular corrosion, when specified)
-
Certification / Inspection Documents
EN 10204 3.1 mill test certificate standard, 3.2 third-party, PMI, ultrasonic and dye-penetrant examination available on request
-
Technical Specifications
Get the key technical specifications for Stainless Steel 304L Round Bar
Orders are normally placed to ASTM A276 / A276M and ASTM A479 / A479M, with ASTM A484 / A484M carrying the dimensional side. European practice specifies the same steel to EN as 1.4307 (X2CrNi18-9); 1.4306 (X2CrNi19-11) also designated 304L. Whichever it is, the standard, the condition and any extra testing belong on the purchase order.
Solution annealing is carried out at approximately 1010-1120 C followed by rapid cooling, normally a water quench, to retain a fully austenitic structure free of carbides. The grade cannot be hardened by heat treatment; higher strength is obtained only through cold working.
Bar reaches its finish two ways: hot rolling or forging followed by heat treatment and pickling, or a further cold operation such as drawing, peeling, turning or grinding. Tolerances on diameter, out of round, straightness and length depend on both size and finish class.
Because carbon is capped at 0.030%, the grade is normally accepted for welded fabrication without a corrective anneal, and intergranular corrosion testing to ASTM A262 Practice E can be specified on the order.
Treat the physical properties as typical producer figures; the standard does not set them. Mechanical testing follows ASTM A370 and everything tested appears on the certificate.
Chemical Composition for Stainless Steel 304L Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.030
%
Manganese
Mn
-
2.00
%
Silicon
Si
-
1.00
%
Phosphorus
P
-
0.045
%
Sulfur
S
-
0.030
%
Chromium
Cr
18.00
20.00
%
Nickel
Ni
8.00
12.00
%
Nitrogen
N
-
0.10
%
Chemical Composition
View the chemical composition and applicable material limits for SS 304L Round Bar
Carbon is held below 0.030%, which suppresses the formation of chromium-rich M23C6 carbides in the 425-815 C sensitising range and preserves chromium in solid solution near weld heat-affected zones.
Chromium runs 18.00 to 20.00% here, and it is what makes the steel stainless: it builds the passive oxide film that resists attack. Nickel at 8.00 to 12.00% stabilises the structure and improves ductility and toughness. The standard also fixes nitrogen to 0.10% maximum. Carbon is capped at 0.030%.
Manganese and silicon go in as deoxidisers during melting and add a little strength. Phosphorus and sulphur are residuals, held low because they hurt hot working, welding and corrosion resistance; sulphur is raised only when a free machining variant is wanted.
Limits differ a little between the ASTM, EN, JIS, GB/T and KS versions. That usually makes no practical difference, but it can in aggressive or high temperature duty, which is why the certified heat analysis is worth reading against the ordered specification. Chemical analysis is carried out to ASTM A751. Where the composition table shows no limit for an element, the standard sets no requirement and the element need not be determined or reported.
Mechanical Properties for Stainless Steel 304L Round Bar
Mechanical Property
Value
Unit
Tensile Strength (Condition A, hot-finished)
485 (min)
MPa
Yield Strength 0.2% (Condition A, hot-finished)
170 (min)
MPa
Elongation in 50 mm (Condition A, hot-finished)
40 (min)
%
Reduction of Area (Condition A, hot-finished)
50 (min)
%
Tensile Strength (Condition A, cold-finished, up to 12.70 mm)
620 (min)
MPa
Yield Strength 0.2% (Condition A, cold-finished, up to 12.70 mm)
310 (min)
MPa
Tensile Strength (Condition A, cold-finished, over 12.70 mm)
485 (min)
MPa
Yield Strength 0.2% (Condition A, cold-finished, over 12.70 mm)
170 (min)
MPa
Elongation in 50 mm (Condition A, cold-finished)
30 (min)
%
Reduction of Area (Condition A, cold-finished)
40 (min)
%
Hardness (Brinell)
Not specified by ASTM A276 / A276M or ASTM A479 / A479M for this grade (typically 150 - 190 HBW as supplied)
HBW
Charpy V-Notch Impact at room temperature
60 - 120
J
Modulus of Elasticity
193
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of SS 304L Round Bar
Minimum tensile and yield values are lower than standard 304 because the reduced carbon content removes part of the interstitial solid-solution strengthening.
The figures apply to solution annealed bar and are checked by tensile testing to ASTM A370 at room temperature. Cold finished bar work hardens while it is drawn or ground, so what arrives is often stronger than the minimum and less ductile than it. Toughness holds up to cryogenic temperatures, with no ductile to brittle transition.
For design, use the specified minima of the standard and condition ordered and take the real numbers from the mill certificate. Section size matters too, since diameter affects cooling rate during heat treatment and how much hot or cold work the bar has seen.
In selection terms, moderate strength combined with very high ductility and toughness favours components that must be formed, welded or extensively machined rather than carry high stress in thin sections. Where greater strength is needed at similar corrosion resistance, cold-worked bar, a duplex grade or a precipitation-hardening grade is normally evaluated instead. Machinability is moderate, and work hardening during cutting should be managed with sharp tooling, positive feed and rigid setups.
Dimension / Sizes for Stainless Steel 304L Round Bar
Dimension / Size
Value
Unit
Diameter (standard supply range)
3 - 500 (larger by forging on request)
mm
Standard Length
3 - 6 (random mill length)
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM A484 / A484M, varies with size and finish class
-
Length Tolerance
Per ASTM A484 / A484M or as agreed on the order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed on the order
-
End Condition
Square cut, saw cut, chamfered or as ordered
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Available Size Range (cold-finished bar)
3 - 100 (typical commercial capability)
mm
Available Size Range (hot-finished and forged bar)
16 - 500 (typical commercial capability)
mm
Cut-to-Length Availability
Available, tolerance to be agreed at order stage
-
Applicable Dimensional Standard
ASTM A484 / A484M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for SS 304L Round Bar
Pricing for Stainless Steel 304L Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Stainless Steel 304L Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
What is Stainless Steel 304L Round Bar?
What standard does Stainless Steel 304L Round Bar comply with?
What are the equivalent grades of Stainless Steel 304L Round Bar?
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What are the key mechanical properties of Stainless Steel 304L Round Bar?
What is the typical chemical composition of Stainless Steel 304L Round Bar?
Can Stainless Steel 304L Round Bar be supplied cut to length or with a specific surface finish?
What is the difference between 304 and 304L round bar?
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