What is the difference between stainless steel 304 and 304L round bar?

The key difference is carbon content. SS 304 has a maximum of 0.07% carbon versus 0.03% for 304L stainless steel bar, making 304L the preferred grade for welding. The lower carbon content in 304L prevents sensitisation during welding, preserving corrosion resistance in the heat-affected zone.

What standard governs 304 stainless steel round bar?

ASTM A276 covers hot-rolled and cold-drawn bars. ASTM A479 covers pressure vessel bar. AMS 5639 covers aerospace bar. EN 10088-3 covers bar under the European standard.

What is the ASTM A276 304L round bar specification?

ASTM A276 304L specifies UNS S30403, Werkstoff 1.4307 / 1.4306, with 0.03% max carbon and 18 to 20% chromium. The standard covers bars in annealed condition.

Do you supply 304 stainless hex bar and flat bar in addition to round bar?

Yes. Jade Alloys stocks 304 and 304L stainless steel hex bar, flat bar, square bar, round bar, hollow bar, threaded bar, and rectangular bar in standard and cut-to-size lengths.

What is the AMS 5639 specification for 304 stainless steel bar?

AMS 5639 is the aerospace material specification covering stainless steel 304 bars, wire, forgings, and rings in the annealed condition for traceable applications.

What is the price of 304 stainless steel round bar?

Pricing depends on diameter, surface finish, length, and LME nickel pricing. Indicative pricing starts at USD 1.20 per kg for standard round bar.

What countries do you export 304 stainless steel round bar to?

Jade Alloys exports to over 50 countries including the UAE, Saudi Arabia, Qatar, Kuwait, Singapore, Germany, the UK, and Australia.

Can I get 304 and 304L on a dual certificate?

Yes. When mill heat chemistry satisfies both grades, Jade Alloys supplies dual-certified 304/304L round bar with clear MTC documentation.

Stainless Steel 304 Round Bars Supplier | ASTM A276

ASTM A276 Type 304 Rod, ASTM A479 GR 304 Bright Bar, UNS S30400 Hot Rolled Bar, 304L (UNS S30403) and 1.4301 / 1.4307 Round Bar Manufacturer, Stockist & Exporter in India

Stainless steel 304 round bar is solid round bar made from 304 (UNS S30400, Werkstoff Nr. 1.4301, 18Cr-8Ni) austenitic stainless steel, the most widely used stainless bar grade. Its low-carbon version, 304L (UNS S30403, 1.4307), holds carbon to 0.030% max so it can be welded without sensitisation. Annealed ASTM A276 / A479 bar has a minimum tensile strength of 515 MPa and minimum yield strength of 205 MPa (304L: 485 / 170 MPa), is non-magnetic, and resists atmospheric corrosion, fresh water, food and dairy media and many organic acids. It is not the grade for seawater or warm chloride service: use 316 / 316L there.

Jade Alloys in Mumbai stocks and exports SS 304 and 304L round bars to ASTM A276, ASTM A479 / ASME SA276, SA479, AMS 5639 and EN 10088-3 (1.4301 / 1.4307), from 3 mm to 800 mm diameter, in bright drawn, cold drawn, centreless ground, peeled, rough turned, hot rolled (black) and forged finishes, in lengths of 3-6 m or cut to size. Every lot is traceable to its heat and ships with an EN 10204 3.1 mill test certificate, with 3.2 third-party inspection on request. Also supplied as hex, square, flat, rectangular, hollow and threaded bar. Check ex-stock sizes or read about us.

Request a quote for stainless steel 304 round bars

Strength (304, annealed)

515 MPa tensile / 205 MPa yield minimum (ASTM A276 Condition A)

Two grades, one bar

304 and 304L; dual-certified 304/304L when chemistry and strength meet both

Sizes

3-800 mm round; hex 2-100 mm A/F; square 4-100 mm

Non-magnetic

Annealed bar is non-magnetic; cold work can make it slightly magnetic

Traceability

EN 10204 3.1 per heat; 3.2 on request

Supply

Ex-stock Mumbai; cut to size; export packing

Quick Section Links

Stainless Steel 304 Round Bar at a Glance

Item	Details
Common names	SS 304, SUS 304, AISI 304, 18-8 stainless, A2 (metric fasteners), 304 stainless steel rod, 1.4301 bar; 304L: SS 304L, SUS 304L, 1.4307 bar
UNS	S30400 (304) / S30403 (304L)
Werkstoff Nr. / EN	1.4301 X5CrNi18-10 (304); 1.4307 X2CrNi18-9 and 1.4306 X2CrNi19-11 (304L)
Specifications	ASTM A276 / ASME SA276 (bars and shapes); ASTM A479 / ASME SA479 (bars for boilers and pressure vessels); AMS 5639 (aerospace, 304); EN 10088-3 and EN 10272
Material type	Austenitic chromium-nickel stainless steel
Minimum tensile / yield (304, annealed)	515 MPa (75 ksi) / 205 MPa (30 ksi)
Minimum tensile / yield (304L, annealed)	485 MPa (70 ksi) / 170 MPa (25 ksi)
Round bar sizes	3-800 mm diameter
Lengths	3000-6000 mm standard; 1000-6000 mm random; cut to size on request
Condition	Annealed (standard); strain-hardened and stress-relieved on request
Finishes	Hot rolled black, peeled, rough turned, cold drawn bright, centreless ground, polished, forged
Certification	Mill Test Certificate EN 10204 3.1; 3.2 third-party on request
Supply	Ex-stock Mumbai; worldwide export

What Is Stainless Steel 304 / 304L Round Bar?

304 contains about 18-20% chromium and 8-11% nickel (ASTM bar limits). The chromium builds a self-healing passive film that gives corrosion resistance; the nickel keeps the structure austenitic, which gives toughness, formability and weldability and makes the bar non-magnetic when annealed. 304 cannot be hardened by heat treatment, only by cold work.

Choose 304 for general fabrication, food and dairy equipment, tanks, shafts, fasteners and architectural parts. Choose 304L where the part is welded and cannot be annealed afterwards. Choose 316 / 316L when chlorides, seawater or de-icing salts are present.

Stainless Steel 304 vs 304L Round Bar

The main difference is carbon. 304 allows up to 0.08% carbon in ASTM A276 / A479 (0.07% in EN 10088-3). 304L is limited to 0.030%. Lower carbon keeps chromium carbides from forming at grain boundaries in the weld heat-affected zone (sensitisation), which would otherwise reduce corrosion resistance there.

Property	SS 304	SS 304L
UNS	S30400	S30403
Werkstoff Nr.	1.4301	1.4307 (also 1.4306)
Carbon max	0.08% ASTM A276 / A479; 0.07% EN 10088-3	0.030%
Min tensile / yield (ASTM, annealed)	515 / 205 MPa	485 / 170 MPa
Sensitisation (425-860 C exposure)	Possible after welding or long exposure	Strongly reduced; no post-weld anneal needed for most services
Best for	Machined parts, shafts, general fabrication, non-welded service	Welded vessels, pipework, tanks, heavy welded sections
Price	Base	Small premium on some sizes

Dual certification (304 / 304L). One heat can be certified to both grades when it meets the stricter limit of each: carbon 0.030% max and tensile and yield strength at or above the 304 minimums (515 / 205 MPa). Most 304L bar sold today is dual-certified. State “304/304L dual cert required” or “304L only” on your purchase order.

Stainless Steel 304 Round Bar Specifications

Item	Details
Standards	ASTM A276, A479; ASME SA276, SA479; AMS 5639; EN 10088-3, EN 10272; see also ASTM and ASME standards
Round bar size	Diameter 3-800 mm
Hex bar size	2-100 mm A/F
Square bar size	4-100 mm
Flat bar size	Thickness 2-100 mm; width 10-500 mm
Angle bar size	3 x 20 x 20 mm to 12 x 100 x 100 mm
Channel	80 x 40 mm to 150 x 75 mm section; 5.0-6.0 mm thickness
Rectangular section	3.0-12.0 mm thickness; 33 x 30 mm to 295 x 1066 mm
Hollow bar	32 mm OD x 16 mm ID to 250 mm OD x 200 mm ID; tolerance H8-H12, K9-K12 or as required
Threaded bar / billet	1/2 inch to 495 mm diameter (see our threaded rod weight chart)
Length	3000-6000 mm standard; 1000-6000 mm random; cut to size
Finish	Hot rolled black, hot rolled annealed and pickled, peeled, rough turned, smooth turned, cold drawn bright, centreless ground, polished, slit rolled edge
Surface (flat and shaped bar)	Bright, sand blasted, hot rolled pickled, hairline, polished
Tolerance	ISO 286 h8, h9, h10, h11 (cold finished); k9-k12 for black bar; ASTM A484 or EN 10060 for hot rolled; or as per customer requirement
Condition	Annealed; strain-hardened and stress-relieved on request
Technique	Hot rolled, cold drawn, cold rolled, forged
Forms	Round, rod, hex (A/F), square, flat, rectangular, hollow, threaded, half-round, triangle, T-bar, channel, angle, precision ground, billet, ingot, rings, blocks, forgings

Surface finish codes

Code	Meaning	Code	Meaning
CD	Cold drawn	P	Polished
BD	Bright drawn	SRE	Slit rolled edge
CG	Centreless ground	HF	Hot finished
CF	Cold finished	HRAP	Hot rolled annealed and pickled
P&T	Peeled and turned	RT	Rough turned / peeled
ST	Smooth turned	PR	Peeled and reeled

Equivalent Grades & Designations of Stainless Steel 304 / 304L

System	SS 304	SS 304L
UNS	S30400	S30403
AISI / ASTM	304	304L
Werkstoff Nr.	1.4301	1.4307 / 1.4306
EN name	X5CrNi18-10	X2CrNi18-9 / X2CrNi19-11
BS	304S31	304S11
JIS	SUS 304	SUS 304L
AFNOR	Z7CN18-09	Z3CN18-10
GOST	08Kh18N10	03Kh18N11
Swedish SS	2332	2352
Aerospace	AMS 5639 (bar)	Confirm AMS number against the customer drawing
Welding filler	ER308 / ER308L	ER308L / E308L-16

Chemical Composition (%) of Stainless Steel 304 and 304L Round Bar

ASTM A276 / A479 (bar)

Grade	C	Mn	Si	P	S	Cr	Ni	Fe
304	0.08 max	2.00 max	1.00 max	0.045 max	0.030 max	18.0-20.0	8.0-11.0	Bal
304L	0.030 max	2.00 max	1.00 max	0.045 max	0.030 max	18.0-20.0	8.0-12.0	Bal

EN 10088-3 (bar)

Grade	C	Si	Mn	P	S	N	Cr	Ni
1.4301 (304)	0.07 max	1.00 max	2.00 max	0.045 max	0.030 max	0.11 max	17.5-19.5	8.0-10.5
1.4307 (304L)	0.030 max	1.00 max	2.00 max	0.045 max	0.030 max	0.11 max	17.5-19.5	8.0-10.5
1.4306 (304L)	0.030 max	1.00 max	2.00 max	0.045 max	0.030 max	0.11 max	18.0-20.0	10.0-12.0

Why the two differ: ASTM and EN set separate limits for carbon, silicon, chromium, nickel and nitrogen. Always state which standard the order is placed under. The mill certificate shows the actual heat analysis.

Mechanical & Physical Properties of 304 and 304L Round Bar

Annealed bar, specification limits

Property	ASTM A276 / A479: 304	ASTM A276 / A479: 304L	EN 10088-3: 1.4301 (+AT)
Tensile strength	515 MPa (75 ksi) min	485 MPa (70 ksi) min	500-700 MPa
0.2% yield strength	205 MPa (30 ksi) min	170 MPa (25 ksi) min	190 MPa min
Elongation	30% min	30% min	45% min
Reduction of area	40% min	40% min	–
Hardness	201 HBW / 92 HRB max	201 HBW / 92 HRB max	215 HB max

Physical properties (typical)

Property	Value
Density	7.93 g/cm3 (often quoted 7.9-8.0)
Melting range	1400-1450 C (2550-2650 F)
Modulus of elasticity	193 GPa
Mean CTE (0-100 C)	17.2 x 10-6 /K
Thermal conductivity (at 100 C)	16.2 W/m.K
Electrical resistivity	0.72 micro-ohm.m
Magnetic response	Non-magnetic annealed; may become slightly magnetic after cold work
Service temperature (oxidation)	Up to about 925 C continuous, 870 C intermittent. For long exposure at 425-860 C prefer 304L

Typical values for reference; the actual results are on the mill test certificate for each heat.

Corrosion Resistance of 304 Stainless Steel Round Bar

304 resists corrosion through its passive chromium oxide film, which repairs itself where oxygen is present. Its pitting resistance (PREN about 18-19) is lower than 316L (about 24) because it has no molybdenum.

Environment	Performance	Engineering note
Atmosphere: rural, urban, mild industrial	Excellent	Normal choice for indoor and outdoor architectural and equipment use
Coastal air, de-icing salts	Limited	Tea staining and pitting can appear; use 316 / 316L
Fresh and treated water, steam	Good	Suitable at moderate temperature and low chloride
Seawater	Not recommended	Use 316L, duplex or super duplex
Food, dairy, brewing	Excellent	Smooth finish and cleanability; specify surface finish and passivation for hygienic use
Organic acids (acetic, citric, lactic)	Good	At ambient to moderate temperature
Nitric acid	Good	Dilute to moderate concentration; test for hot concentrated service
Hydrochloric acid	Not suitable	Causes pitting at any concentration
Sulphuric acid	Limited	Only very dilute and cold; test for your concentration
Mild alkalis	Good	Check temperature and concentration
Chloride stress corrosion cracking	Susceptible	Risk above about 60 C under tensile stress with chlorides; consider duplex
Intergranular corrosion after welding	304: possible; 304L: low risk	Use 304L or solution anneal after welding

Stainless Steel 304 vs 316 vs 303 vs 321 Round Bar

Grade	Main difference	Choose when
304 / 304L	18Cr-8Ni; base austenitic grade	General corrosion resistance, food, architecture, welded work (304L)
316 / 316L	2-3% molybdenum	Chlorides, coastal, marine, chemical, pharmaceutical service. See 316 / 316L round bars
303	Sulphur added for free machining	Heavy high-speed machining of parts not exposed to chlorides; not for welding
321 / 347	Titanium / niobium stabilised	Long service at 425-900 C, or welded without anneal in that range
904L, duplex 2205	Higher Cr, Mo (and N)	Strong chloride and acid service where 316L is not enough. See 904L and duplex 2205

Annealed 304 and 316 have the same ASTM minimum yield (205 MPa); typical values differ slightly by supplier and size.

Welding, Machining & Heat Treatment of 304 Round Bar

Welding: all fusion and resistance methods. Use ER308L / E308L filler for both 304 and 304L. Limit heat input and interpass temperature to reduce distortion and sensitisation. For thick multi-pass welds in corrosive service use 304L or anneal after welding.
Machining: about half the cutting speed of free-machining steel; it work-hardens, so use rigid set-ups, sharp tools, positive feeds and flood coolant, with no light rubbing passes. For heavy machining of parts away from chlorides, 303 machines faster.
Heat treatment: not hardenable by heat treatment. Solution anneal at about 1010-1120 C then cool rapidly. Hot work at 1150-1260 C; avoid working below about 925 C.
Passivation: after machining or welding, pickle and passivate (ASTM A967 / A380) to restore the surface film, especially for food and pharmaceutical parts.

Sizes, Tolerances and Weight Chart

Weight per metre of 304 / 304L round bar (kg/m) = 0.00623 x D x D (D in mm), from a density of 7.93 g/cm3. For other shapes use our metal weight calculator. Weights are theoretical; actual weight varies with tolerance.

Dia (mm)	kg/m	3 m bar (kg)	6 m bar (kg)	Dia (mm)	kg/m	3 m bar (kg)	6 m bar (kg)
6	0.22	0.67	1.35	40	9.97	29.90	59.79
8	0.40	1.20	2.39	50	15.57	46.71	93.42
10	0.62	1.87	3.74	60	22.42	67.26	134.53
12	0.90	2.69	5.38	75	35.03	105.10	210.20
16	1.59	4.78	9.57	100	62.28	186.85	373.69
20	2.49	7.47	14.95	130	105.26	315.77	631.54
25	3.89	11.68	23.36	150	140.13	420.40	840.81
32	6.38	19.13	38.27	200	249.13	747.38	1494.77

Hex bar weight (mm across flats)

A/F (mm)	kg/m	A/F (mm)	kg/m
10	0.687	13	1.161
17	1.985	19	2.479
24	3.956	27	5.006
30	6.181	36	8.900
41	11.544	46	14.532
50	17.169

Square bar weight

Side (mm)	kg/m	Side (mm)	kg/m
6	0.285	8	0.508
10	0.793	12	1.142
16	2.030	20	3.172
25	4.956	32	8.120
40	12.688	50	19.825

Inch to millimetre reference

Inch	1/4	3/8	1/2	5/8	3/4	1	1-1/4	1-1/2	2	3	4
mm	6.35	9.53	12.70	15.88	19.05	25.40	31.75	38.10	50.80	76.20	101.60

Cold finished round bar tolerance (ISO 286, mm, upper limit 0)

Diameter (mm)	h8	h9	h10	h11
3 to 6	-0.018	-0.030	-0.048	-0.075
over 6 to 10	-0.022	-0.036	-0.058	-0.090
over 10 to 18	-0.027	-0.043	-0.070	-0.110
over 18 to 30	-0.033	-0.052	-0.084	-0.130
over 30 to 50	-0.039	-0.062	-0.100	-0.160
over 50 to 80	-0.046	-0.074	-0.120	-0.190
over 80 to 120	-0.054	-0.087	-0.140	-0.220

Hot rolled black bar is supplied to the standard stated on the order (ASTM A484 or EN 10060). For tight tolerance on hot rolled bar, ask for peeled and turned (P&T) or ground finish.

ASTM A276 Type 304 rod: typical finish, size range and tolerance

Type	Size (inch)	Size (mm)	ISO tolerance
Peeled and polished	1.50 to 6.00	40 to 150	h11
Cold drawn and polished	1/8 to 3.00	3 to 75	h8, h9, h10, h11
Cold drawn and ground	3/8 to 2.50	10 to 75	h8, h9, h10, h11
Peeled and ground	3/4 to 2.00	20 to 50	h9, h10, h11

Stainless Steel 304 Bar Forms in Stock

Form	Typical use	Link
Round bar (annealed, bright, peeled, ground, forged)	Shafts, pins, fasteners, machined parts	This page
Hex bar 2-100 mm A/F	Bar-fed lathes, nuts, fittings	[Add hex bar page link if live]
Square bar 4-100 mm	Keys, frames, supports	[Add square bar page link if live]
Flat bar	Brackets, plates, strips	[Add flat bar page link if live]
Bright bar	Close-tolerance shafts and spindles	[Add bright bar page link if live]
Hollow, threaded, rectangular, forged bar and rings	Sleeves, tie rods, heavy sections	Enquiry

Stainless Steel 304 / 304L Round Bars Inventory

Stainless Steel 304/304L Hex Bar

Stainless Steel 304/304L Square Bar

Stainless Steel 304/304L Bright Bar

Stainless Steel 304/304L Threaded Bar

Stainless Steel 304/304L Flat Bar

Stainless Steel 304/304L Rectangular Bar

Value-Added Services for SS 304 Round Bar

Bandsaw cutting to length and cut-to-size blanks
Centreless grinding to close diameter tolerances
Peeling, turning and polishing to surface specification
Annealing and solution annealing
Custom bundling and export packing: seaworthy crates, pallets, VCI paper, PVC wrap
Dual certification (304 / 304L) on qualifying heats
Third-party inspection coordination (SGS, Bureau Veritas, TUV)

Testing, Inspection and Certification

Every lot is traceable to its heat number. Available on request: EN 10204 3.1 mill test certificate, 3.2 third-party inspection, chemical analysis, tension and hardness tests, intergranular corrosion test (ASTM A262 Practice E), positive material identification, dimensional and straightness checks, ultrasonic testing for forged bar, NABL-accredited lab reports. See our Quality and Certificate pages.

Applications of Stainless Steel 304 Round Bar

Food, dairy and beverage equipment: shafts, agitators, fittings and frames; suitable for food-contact equipment.
Chemical processing (mild media): valve parts, fittings and supports in organic acids and mild alkalis; use 316L for chlorides.
Pharmaceutical and hygienic equipment: machined and polished parts that can be passivated.
Oil, gas and general process plant (moderate duty): pump shafts, instrument fittings and supports where chloride level is low. Check sour-service limits against NACE MR0175 / ISO 15156.
Architecture and construction: handrails, balustrades, anchors and decorative parts in indoor and mild outdoor settings.
Heat exchangers and pressure vessels: ASTM A479 bar for pressure parts; 304L where welded.
Power and paper-pulp: supports, condenser parts and instrument fittings in mild acids.
General engineering: shafts, pins, bolts, spacers and machined components.

Where chlorides, seawater or strong acids are present, use 316 / 316L or a duplex grade.

Why Choose Jade Alloys for Stainless Steel 304 Round Bars?

Traceable material: EN 10204 3.1 with every shipment; heat-to-certificate traceability.
Ready inventory: common sizes held in Mumbai; cut-to-size on request.
Dual-certified bar: 304/304L on qualifying heats, so one stock serves welded and non-welded orders.
Technical support: grade selection (304, 304L, 316L), standard choice (ASTM or EN) and weight calculation for your enquiry.
Export experience: documentation and packing for Gulf, Asia and Europe.

Frequently Asked Questions

Solid round bar made from 304 (UNS S30400, 1.4301) austenitic stainless steel, about 18-20% chromium and 8-11% nickel. Annealed bar has 515 MPa minimum tensile and 205 MPa minimum yield strength and is non-magnetic. It resists atmospheric corrosion, fresh water, food media and many organic acids.

Carbon content. 304 allows up to 0.08% (ASTM) or 0.07% (EN); 304L is limited to 0.030%, which prevents sensitisation in welds. 304L has slightly lower specified strength (485 / 170 MPa).

Yes, when the heat has carbon 0.030% max and meets the 304 strength minimums (515 / 205 MPa). State "304/304L dual cert" on the order.

Carbon 0.08 max, manganese 2.00 max, silicon 1.00 max, phosphorus 0.045 max, sulphur 0.030 max, chromium 18.0-20.0, nickel 8.0-11.0, iron balance. EN 10088-3 1.4301 has its own limits, shown in the chemistry tables above.

ASTM A276 / A479 annealed: 515 MPa (75 ksi) minimum tensile, 205 MPa (30 ksi) minimum yield, 30% minimum elongation. 304L: 485 / 170 MPa.

Annealed 304 is non-magnetic. Cold working (drawing, bending) can make it slightly magnetic. Annealing restores the non-magnetic condition.

316 contains 2-3% molybdenum, which gives much better resistance to chlorides and pitting. Use 316 / 316L for coastal, marine and chloride service; 304 for general duty at lower cost.

No for immersion or splash zones. It can pit and crevice-corrode in chlorides. Use 316L, duplex or super duplex. 304 suits mild coastal air only for non-critical parts.

Weight in kg per metre = 0.00623 × diameter in mm squared. A 50 mm bar weighs about 15.57 kg per metre, so about 46.7 kg for 3 m and 93.4 kg for 6 m.

A276 covers stainless bars and shapes in hot-finished or cold-finished condition for general use. A479 covers bars and shapes for boilers and pressure vessels. Many bars are dual-certified to both.

AMS 5639 is the aerospace material specification for 304 stainless steel bar and forgings in the solution-treated condition. Quote it on the order when your drawing calls for it.

Straight hot-rolled round bar falls under HSN 7222 11 and cold-finished (bright) bar under 7222 20 in India.

EN 10204 3.1 mill test certificate with each lot, 3.2 third-party inspection on request, and export documentation. Stock sizes ship quickly; confirm timing for cut-to-size and special finishes.

Price depends on nickel cost, diameter, finish, quantity, certificate and destination. Send your size list and quantity for a same-day quotation.

Get a Quote for Stainless Steel 304 Round Bars

Send grade (304, 304L or dual cert), standard (ASTM or EN), diameter, length, finish, quantity, certificate type and destination. Our team replies the same working day with price, availability and certificates.

WhatsApp Us +91-9987685906 Email RFQ sales@jadealloys.com Submit RFQ Online Contact Form

Stainless Steel 304 Round Bars Supplier, Stockist & Exporter in India