Stainless Steel 304 Round Bar
➡️ SS 304 | UNS S30400 | EN 1.4301
➡️ 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:
S30400
Wr. No.:
1.4301
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel 304 Round Bar
Stainless Steel 304 Round Bar is a solid cylindrical bar produced in austenitic chromium-nickel stainless steel Type 304 (UNS S30400). It is supplied principally to ASTM A276 / A276M, with dimensional, straightness and surface requirements taken from ASTM A484 / A484M. In Europe the same material is ordered to EN 10088-3 as grade 1.4301 (X5CrNi18-10).
The nominal 18 % chromium and 8-11 % nickel chemistry forms a stable passive oxide film that resists atmospheric corrosion, potable and process water, many organic acids and the alkaline cleaning media used in food and dairy plants. Molybdenum is not present, so pitting and crevice resistance in warm chloride service is lower than that of Type 316.
Bars are supplied hot-finished (hot rolled or forged, then solution annealed) or cold-finished (cold drawn, peeled, rough turned, smooth turned, centreless ground or polished), normally in Condition A. Cold-worked Conditions S and B are available where higher strength is specified. The grade is not hardenable by heat treatment. Strength is raised only by cold work, which can also induce a slight magnetic response in an otherwise essentially non-magnetic material.
Typical supply covers diameters from about 3 mm to 350 mm in random 3-6 m lengths or cut to order. Type 304 machines and welds by all common processes and normally needs no post-weld heat treatment in thin sections. It is used for shafts, spindles, pins, fasteners, valve stems and machined components across food and beverage, pharmaceutical, chemical, water treatment, architectural and general engineering industries. Wide global availability and consistent mill certification make it the default austenitic bar grade for moderate corrosion duty.
Common Applications of Stainless Steel 304 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 304 Round Bar
Standard
Country / Region
Grade
ASTM A276 / A276M
USA
Type 304 (UNS S30400)
ASME SA-276
USA
Type 304 (UNS S30400)
ASTM A479 / A479M
USA
UNS S30400
EN 10088-3
Europe / EU
X5CrNi18-10 (1.4301)
BS EN 10088-3
United Kingdom
X5CrNi18-10 (1.4301)
JIS G4303
Japan
SUS304
GB/T 1220
China
06Cr19Ni10 (S30408)
KS D 3706
South Korea
STS304
ISO 15510
International
X5CrNi18-10 (1.4301)
Technical Specification for Stainless Steel 304 Round Bar
Specification
Value
Unit
Material
Stainless Steel
-
Grade
Type 304 / UNS S30400 / EN 1.4301
-
Product Form
Round Bar (Rod)
-
Standard
ASTM A276 / A276M
-
Dimensional Standard
ASTM A484 / A484M
-
Standard Edition Referenced
ASTM A276 / A276M-25. ASTM A484 / A484M-24b. EN 10088-3:2023. EN 10088-1:2023
-
Diameter
3 - 350 (stated supply range)
mm
Length
3 - 6 random mill length or cut to length
m
Manufacturing Process
Hot rolled, forged, cold drawn, peeled, turned or centreless ground
-
Production Route
EAF melting with AOD or VOD refining, continuous cast bloom or ingot, hot rolled or forged
-
Surface Finish
Hot rolled and pickled, cold drawn bright, peeled, rough turned, smooth turned, centreless ground or polished. EN 10088-3 conditions 1C, 1E, 1D, 1X, 1G, 2H, 2D, 2B, 2G, 2P
-
Heat Treatment / Delivery Condition
Solution annealed, Condition A (ASTM) / +AT (EN). ASTM solution annealing practice is 1040 C minimum to dissolve grain-boundary carbides, followed by rapid cooling
-
Tolerance Standard
ASTM A484 / A484M. EN 10278 for bright products, IT 8 to IT 11 for conditions 2H 2B 2D and IT 9 or finer for centreless ground condition 2G
-
Carbon Equivalent (CEV)
Not applicable to austenitic stainless steel
-
Density
8.00 typical (7.9 per EN 10088-1)
g/cm3
Melting Range
1400 - 1450 typical
C
Thermal Conductivity at 100 C
16.2 typical (15 at 20 C per EN 10088-1)
W/m.K
Coefficient of Thermal Expansion 0-100 C
17.2 typical (16.0 for 20-200 C per EN 10088-1)
um/m.C
Specific Heat at 20 C
500 typical
J/kg.K
Electrical Resistivity at 20 C
0.72 typical (0.73 per EN 10088-1)
uohm.m
Modulus of Elasticity at 20 C
193 typical (200 per EN 10088-1)
GPa
Poisson Ratio
0.29 typical
-
Magnetic Properties
Essentially non-magnetic in the solution-annealed condition. Slightly magnetic after cold work
-
PREN (calculated)
18 - 20 (%Cr + 3.3 x %Mo)
-
Testing / Inspection Standard
ASTM A370 mechanical testing. ASTM A262 intergranular corrosion when specified. ASTM E353 or E1086 chemical analysis
-
Certification / Inspection Documents
EN 10204 Type 3.1 or Type 3.2 mill test certificate
-
Technical Specifications
Get the key technical specifications for Stainless Steel 304 Round Bar
Stainless Steel 304 Round Bar is normally ordered to ASTM A276 / A276M in Condition A, with diameter, out-of-round, straightness and surface requirements taken from ASTM A484 / A484M. European orders use EN 10088-3 grade 1.4301 in the +AT condition, with bright bar tolerances to EN 10278 and hot rolled round bar dimensions to EN 10060.
Solution annealing under ASTM A276 requires heating to at least 1040 C followed by rapid cooling, normally a water quench, to dissolve chromium carbides and retain a fully austenitic structure. The grade cannot be hardened by heat treatment. Cold drawing, peeling, turning or grinding raises strength through work hardening, tightens the diameter tolerance and improves surface roughness, which is why cold-finished bar is specified for precision machining.
Tolerance class varies with both diameter and finish, so the purchase order should state size, finish and tolerance class explicitly rather than relying on a single blanket figure. Mechanical testing follows ASTM A370. Where resistance to intergranular attack matters, ASTM A262 Practice E is added as a supplementary requirement, and low-carbon 304L is often substituted for welded assemblies. Prolonged exposure between 425 C and 815 C sensitises the grade. Material is normally released against an EN 10204 Type 3.1 certificate stating heat number, chemical analysis, mechanical results and delivery condition.
Chemical Composition for Stainless Steel 304 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.08
%
Manganese
Mn
-
2.00
%
Phosphorus
P
-
0.045
%
Sulfur
S
-
0.030
%
Silicon
Si
-
1.00
%
Chromium
Cr
18.00
20.00
%
Nickel
Ni
8.00
11.00
%
Iron
Fe
Balance
Balance
%
Chemical Composition
View the chemical composition and applicable material limits for SS 304 Round Bar
The composition above is the heat analysis required by ASTM A276 / A276M for Type 304 (UNS S30400). Chromium at 18.00-20.00 % is the element responsible for the passive oxide film that gives the grade its corrosion resistance in oxidising conditions. Nickel at 8.00-11.00 % stabilises the austenitic structure at room temperature, which is what delivers the high ductility, toughness at sub-zero temperature and freedom from a ductile-to-brittle transition.
Carbon is capped at 0.08 % to limit the precipitation of chromium carbides at grain boundaries during welding or exposure in the 425-815 C range. Sensitisation of this kind depletes chromium locally and leaves the material open to intergranular corrosion, which is why 304L is preferred for heavily welded fabrications. Manganese and silicon act as deoxidisers during melting and contribute modest solid-solution strengthening. Phosphorus and sulfur are residual elements held to 0.045 % and 0.030 % because both reduce hot workability and weld soundness. Sulfur at the upper end aids chip breaking slightly, but free-machining behaviour requires Type 303 under ASTM A582 / A582M instead.
EN 10088-3 grade 1.4301 applies tighter limits: carbon 0.07 % maximum, chromium 17.5-19.5 %, nickel 8.0-10.5 % against 8.00-11.00 % in ASTM, plus a nitrogen ceiling of 0.10 %. EN also permits controlled sulfur bands within the 0.030 % maximum, 0.015-0.030 % for machinability and 0.015 % maximum for polishability. Dual-certified bar should be checked against both.
Mechanical Properties for Stainless Steel 304 Round Bar
Mechanical Property
Value
Unit
Tensile Strength - ASTM A276 Condition A hot-finished all sizes
515 minimum
MPa
Yield Strength 0.2 % offset - ASTM A276 Condition A hot-finished all sizes
205 minimum
MPa
Elongation in 50 mm or 4D - ASTM A276 Condition A hot-finished all sizes
40 minimum
%
Reduction of Area - ASTM A276 Condition A hot-finished all sizes
50 minimum
%
Tensile Strength - ASTM A276 Condition A cold-finished up to 12.70 mm
620 minimum
MPa
Yield Strength 0.2 % offset - ASTM A276 Condition A cold-finished up to 12.70 mm
310 minimum
MPa
Elongation in 50 mm or 4D - ASTM A276 Condition A cold-finished up to 12.70 mm
30 minimum
%
Reduction of Area - ASTM A276 Condition A cold-finished up to 12.70 mm
40 minimum
%
Tensile Strength - ASTM A276 Condition A cold-finished over 12.70 mm
515 minimum
MPa
Yield Strength 0.2 % offset - ASTM A276 Condition A cold-finished over 12.70 mm
205 minimum
MPa
Elongation in 50 mm or 4D - ASTM A276 Condition A cold-finished over 12.70 mm
30 minimum
%
Reduction of Area - ASTM A276 Condition A cold-finished over 12.70 mm
40 minimum
%
Brinell Hardness - ASTM A276 Condition A
No requirement specified by ASTM A276 for austenitic Condition A
HBW
Tensile Strength Rm - EN 10088-3 solution annealed hot formed conditions 1C 1E 1D 1X 1G 2D diameter up to 160 mm
500 - 700 range
MPa
0.2 % Proof Strength Rp0.2 - EN 10088-3 solution annealed diameter up to 160 mm
190 minimum
MPa
1.0 % Proof Strength Rp1.0 - EN 10088-3 solution annealed diameter up to 160 mm
225 minimum
MPa
Elongation A longitudinal - EN 10088-3 solution annealed diameter up to 160 mm
45 minimum
%
Impact Energy KV2 ISO-V longitudinal - EN 10088-3 solution annealed diameter up to 160 mm
100 minimum
J
Elongation A transverse - EN 10088-3 solution annealed diameter over 160 up to 250 mm
35 minimum
%
Impact Energy KV2 ISO-V transverse - EN 10088-3 solution annealed diameter over 160 up to 250 mm
60 minimum
J
Hardness - EN 10088-3 solution annealed diameter up to 160 mm
215 maximum (guidance value only per EN 10088-3 Table 8 footnote c)
HBW
0.2 % Proof Strength Rp0.2 - EN 10088-3 bright bar conditions 2H 2B 2G 2P diameter up to 10 mm
400 minimum
MPa
Tensile Strength Rm - EN 10088-3 bright bar diameter up to 10 mm
600 - 950 range
MPa
Elongation A5 - EN 10088-3 bright bar diameter up to 10 mm
25 minimum
%
0.2 % Proof Strength Rp0.2 - EN 10088-3 bright bar diameter over 16 up to 40 mm
190 minimum
MPa
Tensile Strength Rm - EN 10088-3 bright bar diameter over 16 up to 40 mm
600 - 850 range
MPa
Elongation A5 - EN 10088-3 bright bar diameter over 16 up to 40 mm
25 minimum
%
0.2 % Proof Strength Rp0.2 - EN 10088-3 bright bar diameter over 63 up to 160 mm
190 minimum
MPa
Tensile Strength Rm - EN 10088-3 bright bar diameter over 63 up to 160 mm
500 - 700 range
MPa
Elongation A5 - EN 10088-3 bright bar diameter over 63 up to 160 mm
45 minimum
%
0.2 % Proof Strength Rp0.2 - EN 10088-3 cold work hardened condition 2H +C700
350 minimum
MPa
Tensile Strength Rm - EN 10088-3 cold work hardened condition 2H +C700
700 - 850 range
MPa
Elongation A - EN 10088-3 cold work hardened condition 2H +C700
20 minimum
%
0.2 % Proof Strength Rp0.2 - EN 10088-3 cold work hardened condition 2H +C800
500 minimum
MPa
Tensile Strength Rm - EN 10088-3 cold work hardened condition 2H +C800
800 - 1000 range
MPa
Elongation A - EN 10088-3 cold work hardened condition 2H +C800
12 minimum
%
Modulus of Elasticity at 20 C
193 typical (200 per EN 10088-1)
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of SS 304 Round Bar
All ASTM values above are mandatory minima for Condition A, verified by tensile testing to ASTM A370 on a 50 mm gauge length or 4D proportional specimen. ASTM A276 sets no Brinell hardness limit for austenitic grades in Condition A. EN 10088-3 lists 215 HBW for 1.4301 but flags it as a guidance value, not a requirement, so any hardness figure quoted for 304 bar is a typical mill result rather than a specified limit.
Requirements change with finish and diameter. ASTM cold-finished bar up to 12.70 mm must reach 620 MPa tensile and 310 MPa yield, with elongation falling from 40 % to 30 %. Above 12.70 mm the cold-finished minima return to 515 MPa and 205 MPa. EN 10088-3 bands bright bar into five diameter ranges. Beyond the three listed above, 10 to 16 mm takes Rp0.2 400 MPa and Rm 600 to 950 MPa, and 40 to 63 mm takes Rp0.2 190 MPa and Rm 580 to 850 MPa. Over 160 mm, EN testing switches to transverse specimens, so elongation drops to 35 % and impact energy to 60 J.
The grade cannot be quench hardened. Higher strength comes from cold work, through ASTM Conditions S and B or the EN 2H levels +C700 and +C800. EN caps +C700 at about 35 mm diameter and +C800 at about 25 mm. Design to the minima of the ordered standard, condition and size.
Dimension / Sizes for Stainless Steel 304 Round Bar
Dimension / Size
Value
Unit
Diameter - standard stock range
3 - 350 (stated supply capability)
mm
Diameter - hot rolled or forged
16 - 350 (larger by open-die forging on enquiry)
mm
Diameter - cold drawn bright bar
3 - 100
mm
Diameter - peeled, turned or centreless ground
6 - 250
mm
Standard Length - random mill length
3 - 6
m
Custom Length - cut to length
0.1 - 6 (customisable to order)
m
Diameter Tolerance
Per ASTM A484 / A484M by size and finish class. EN 10278 h9 or h11 for bright bar
-
Length Tolerance
Per ASTM A484 / A484M or as agreed on order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed on order
-
Out-of-Round / Circularity
Controlled by the ASTM A484 / A484M tolerance class for the ordered size and finish
-
End Condition
Saw cut, sheared, chamfered or machined square as ordered
-
Surface Finish
Hot rolled and pickled, cold drawn bright, peeled, rough turned, smooth turned, centreless ground or polished
-
Cut-to-Length Availability
Available on request
-
Applicable Dimensional Standard
ASTM A484 / A484M. EN 10060 hot rolled round bar. EN 10278 bright products
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for SS 304 Round Bar
Pricing for Stainless Steel 304 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 304 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 304 Round Bar?
What standard does Stainless Steel 304 Round Bar comply with?
What are the equivalent grades of Stainless Steel 304 Round Bar?
What sizes and lengths are available in Stainless Steel 304 Round Bar?
What are the key mechanical properties of Stainless Steel 304 Round Bar?
What is the typical chemical composition of Stainless Steel 304 Round Bar?
Can Stainless Steel 304 Round Bar be supplied cut to length or with a specific finish?
What is the difference between Stainless Steel 304 and 316 Round Bar?
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