Stainless Steel Round Bar
Stainless round bar from Ø 3 mm to Ø 450 mm in hot-rolled, cold-drawn, centreless-ground, peeled and forged condition — 303, 304L, 316L, 321, 410, 431, 17-4 PH, Duplex 2205 and SDSS 2507 to ASTM A276 / A479.
What is Stainless Steel Round Bar?
Stainless steel round bar is a solid cylindrical long product supplied to ASTM A276 / A479 in diameters from Ø 3 mm to Ø 450 mm, in hot-rolled, cold-drawn, centreless-ground, peeled and forged conditions, in 3, 4 and 6 metre lengths. It is the primary machining stock for shafts, pins, bolts, valve stems, pump components and turned parts, and Steelco holds 303, 304, 304L, 316, 316L, 321, 410, 420, 431, 17-4 PH, Duplex 2205 and Super Duplex 2507 in ready stock in Mumbai.
All grades we stock in stainless steel round bar.
Click any grade for its full chemical composition, mechanical properties, equivalents and typical applications. Every grade ships with EN 10204 3.1 / 3.2 certification from our Mumbai stockyard.
Why Choose Stainless Steel Round Bar
Machining stock in every condition
Cold-drawn h9 / h11 bar for close-tolerance turning, centreless-ground h6 / h7 for shafting, and hot-rolled black bar for economical roughing or forging.
Free-machining option
Grade 303 with controlled sulphur gives roughly 30% faster cutting speeds and short chips on automatic lathes, where the loss of corrosion resistance is acceptable.
Hardenable and high-strength grades
410, 420 and 431 harden to 40–55 HRC for shafts and wear parts, and 17-4 PH ages to 1310 MPa in H900 condition for valve stems and pump shafts.
Straightness for shafting
Peeled and ground bar is supplied straightened to 0.5 mm/m or better, so long shafts run true without pre-machining correction.
Sour-service compliance
316L, Duplex 2205 and SDSS 2507 bar can be supplied to NACE MR0175 / ISO 15156 with hardness capped at 22 HRC / 32 HRC as applicable.
Technical Specifications
| Attribute | Details |
|---|---|
| Standards | ASTM A276 / A479 / A484 / A582 · ASME SA479 · EN 10088-3 · JIS G4303 |
| Product Type | Hot-rolled, cold-drawn, centreless-ground, peeled / smooth-turned and forged bar |
| Diameter Range | Ø 3 mm to Ø 450 mm (forged bar up to Ø 800 mm to order) |
| Standard Lengths | 3000, 4000, 5800, 6000 mm; cut-to-length from 20 mm |
| Grades Stocked | 303 · 304 · 304L · 316 · 316L · 321 · 347 · 410 · 420 · 431 · 17-4 PH · Duplex 2205 · SDSS 2507 |
| Condition | Annealed / solution treated; hardened & tempered (410/420/431); H900–H1150 (17-4 PH) |
| Diameter Tolerance | Cold drawn h9 / h11 · centreless ground h6 / h7 · hot rolled per ASTM A484 |
| Straightness | ≤ 0.5 mm per metre on ground and peeled bar |
| Surface Finish | Black, pickled, bright drawn, polished (Ra ≤ 0.8 µm) or centreless ground |
| Testing | UT per ASTM A388, hardness, tensile, IGC per ASTM A262, PMI |
| Certification | EN 10204 3.1 / 3.2 · NACE MR0175 / ISO 15156 · PED on request |
Grade availability by condition
| Grade | UNS | Hot rolled | Cold drawn | Ground | Peeled / forged | NACE |
|---|---|---|---|---|---|---|
| SS 303 | S30300 | — | — | — | ||
| SS 304 / 304L | S30400 / S30403 | — | ||||
| SS 316 / 316L | S31600 / S31603 | |||||
| SS 321 | S32100 | — | — | |||
| SS 410 / 420 | S41000 / S42000 | — | ||||
| SS 431 | S43100 | — | ||||
| 17-4 PH | S17400 | |||||
| Duplex 2205 | S32205 | — | ||||
| SDSS 2507 | S32750 | — | — |
Note: Diameters above Ø 450 mm are supplied as forged bar against order (4–6 weeks).
Use our free metal weight calculator — bars, sheets, plates, pipes and sections.
Grade chemistry and mechanical properties supplied in stainless steel round bar.
Chemical composition and mechanical properties are grade properties, not form properties — the same grade keeps the same chemistry whether it is supplied as sheet, plate or coil. The tables below list the specified limits for each grade we stock in stainless steel round bar, tested and certified to ASTM A276 / A479. Values are weight percent (maximum unless a range is shown); mechanical values are minima in the annealed condition.
Chemical composition (weight %)
| Grade | C | Mn | Si | P | S | Cr | Ni | N | Mo | Ti | Nb+Ta | Cu | Nb |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SS 201UNS S20100 | 0.15 | 5.50–7.50 | 1.00 | 0.060 | 0.030 | 16.0–18.0 | 3.5–5.5 | 0.25 | — | — | — | — | — |
| SS 202UNS S20200 | 0.15 | 7.50–10.00 | 1.00 | 0.060 | 0.030 | 17.0–19.0 | 4.0–6.0 | 0.25 | — | — | — | — | — |
| SS 304 / 304LUNS S30400 / S30403 | 0.08 (304) / 0.030 (304L) | 2.00 | 0.75 | 0.045 | 0.030 | 18.0–20.0 | 8.0–10.5 | 0.10 | — | — | — | — | — |
| SS 316 / 316LUNS S31600 / S31603 | 0.08 (316) / 0.030 (316L) | 2.00 | 0.75 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 0.10 | 2.00–3.00 | — | — | — | — |
| SS 321 / 321HUNS S32100 / S32109 | 0.08 (321) / 0.04–0.10 (321H) | 2.00 | 0.75 | 0.045 | 0.030 | 17.0–19.0 | 9.0–12.0 | — | — | 5×C–0.70 | — | — | — |
| SS 310 / 310SUNS S31000 / S31008 | 0.25 (310) / 0.08 (310S) | 2.00 | 1.50 | 0.045 | 0.030 | 24.0–26.0 | 19.0–22.0 | — | — | — | — | — | — |
| SS 347 / 347HUNS S34700 / S34709 | 0.08 (347) / 0.04–0.10 (347H) | 2.00 | 0.75 | 0.045 | 0.030 | 17.0–19.0 | 9.0–13.0 | — | — | — | 10×C–1.00 | — | — |
| SS 317LUNS S31703 | 0.030 | 2.00 | 0.75 | 0.045 | 0.030 | 18.0–20.0 | 11.0–15.0 | — | 3.00–4.00 | — | — | — | — |
| SS 904LUNS N08904 | 0.020 | 2.00 | 1.00 | 0.045 | 0.035 | 19.0–23.0 | 23.0–28.0 | — | 4.00–5.00 | — | — | 1.00–2.00 | — |
| 17-4 PHUNS S17400 | 0.07 | 1.00 | 1.00 | 0.040 | 0.030 | 15.0–17.5 | 3.0–5.0 | — | — | — | 0.15–0.45 | 3.0–5.0 | — |
| SS 410 / 410SUNS S41000 / S41008 | 0.15 | 1.00 | 1.00 | 0.040 | 0.030 | 11.5–13.5 | 0.75 | — | — | — | — | — | — |
| SS 430UNS S43000 | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0–18.0 | 0.75 | — | — | — | — | — | — |
| SS 409 / 409MUNS S40900 / S40930 | 0.030 | 1.00 | 1.00 | 0.040 | 0.020 | 10.5–11.7 | 0.50 | — | — | 6×C–0.75 | — | — | — |
| SS 441UNS S44100 | 0.030 | 1.00 | 1.00 | 0.040 | 0.030 | 17.5–18.5 | 0.50 | — | — | 0.10–0.60 | — | — | 0.30–0.90 |
Balance iron. Single figures are maximum limits. Mill test certificates to EN 10204 3.1 are issued with every dispatch.
Mechanical properties (annealed, minimum)
| Grade | Tensile Strength (min) | Yield Strength (0.2%) | Elongation in 50 mm | Hardness (Rockwell B) | Tensile Strength (H900) | Yield Strength (H900) | Hardness (Rockwell C) | Tensile Strength (annealed) | Hardness (Rockwell B, annealed) |
|---|---|---|---|---|---|---|---|---|---|
| SS 201 | 515 MPa (75 ksi) | 275 MPa (40 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 202 | 515 MPa (75 ksi) | 275 MPa (40 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 304 / 304L | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 92 max | — | — | — | — | — |
| SS 316 / 316L | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 321 / 321H | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 310 / 310S | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 347 / 347H | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 92 max | — | — | — | — | — |
| SS 317L | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 904L | 490 MPa (71 ksi) | 215 MPa (31 ksi) | 35% min | 90 max | — | — | — | — | — |
| 17-4 PH | — | — | 10% min | — | 1310 MPa (190 ksi) | 1170 MPa (170 ksi) | 40–48 | — | — |
| SS 410 / 410S | — | 275 MPa (40 ksi) | 20% min | — | — | — | — | 480 MPa (70 ksi) | 96 max |
| SS 430 | 450 MPa (65 ksi) | 205 MPa (30 ksi) | 22% min | 89 max | — | — | — | — | — |
| SS 409 / 409M | 380 MPa (55 ksi) | 205 MPa (30 ksi) | 20% min | 88 max | — | — | — | — | — |
| SS 441 | 415 MPa (60 ksi) | 205 MPa (30 ksi) | 18% min | 89 max | — | — | — | — | — |
Typical annealed values; actual results are stated on the heat-specific mill test certificate.
Application Sectors
Pumps & Valves
Shafts, stems, spindles and trim in 316L, 431 and 17-4 PH — NACE where sour.
Fasteners
Bolt, stud and nut stock in 304, 316 and A4-80 cold-drawn bar.
Oil & Gas
Downhole tools, hangers and wellhead parts in Duplex 2205 and SDSS 2507.
Food & Pharma Machinery
Augers, agitator shafts and rollers in polished 316L.
Automatic Machining
High-volume turned parts on CNC and cam autos from free-machining 303.
Marine
Propeller and rudder shafts in 316L, Duplex 2205 and 17-4 PH.
Power Generation
Turbine bolting, valve stems and studs in 410 and 321.
General Engineering
Pins, dowels, spacers, bushes and machined fittings.
Cut, finished and certified to your drawing.
Material leaves our Mumbai facility finished to your specification — not as raw stock.
Why buy from Steelco.
Steelco Metal & Alloys is a Mumbai-based stockist, importer and exporter of stainless steel and nickel alloys, shipping certified material worldwide.
Quality & testing on every dispatch
- EN 10204 3.1 mill test certificate on every dispatch
- 3.2 certification with TÜV / SGS / BV / Lloyd's / IRS / IBR witness on request
- Positive Material Identification (PMI) with portable XRF / OES
- Dye-penetrant (DPT), ultrasonic (UT) and hydro testing on request
- NACE MR0175 / ISO 15156 compliance for sour service
- PED 2014/68/EU compliance for pressure equipment
- Heat-number stencilling and marking for full traceability
Deep ready stock
Over 700 MT of stainless round bar in stock from Ø 3 mm to Ø 450 mm in 303, 304L, 316L, 321, 410, 420, 431, 17-4 PH, Duplex 2205 and SDSS 2507 — cut and dispatched within 24–72 hours.
Mill-direct sourcing
Approved supply from Jindal, JSL, Outokumpu, Aperam, Acerinox, Sandvik and leading Japanese and Korean mills — every item traceable to a named producer.
Full certification
EN 10204 3.1 mill test certificate as standard, 3.2 with TÜV, SGS, BV, Lloyd's, IRS or IBR witness, plus PMI, DPT and UT reports on request.
On-time worldwide delivery
Regular export shipments to the GCC, Africa, Southeast Asia, Europe, Latin America and the USA via Nhava Sheva (JNPT), Mundra and Mumbai ports.
How your material is packed and shipped.
Every consignment leaves our Mumbai facility protected for transit and documented for customs, whether it moves by road within India or by sea to an overseas port.
Domestic & export packing
- Bars bundled hexagonally with steel strapping at 1 m intervals
- Ground and polished bar sleeved in PE film or VCI paper
- Wooden cases for small-diameter and cut-length bar
- End caps and heat-number tags on every bundle
Global shipments
- HS Code: 7222 (stainless bars and rods)
- FOB / CFR / CIF terms via Nhava Sheva (JNPT), Mundra and Mumbai ports
- Documentation: commercial invoice, packing list, MTC, bill of lading, COO, insurance
- Regular exports to the GCC, Africa, Southeast Asia, Europe, Latin America and the USA
Ready to price your requirement?
Share grade, size and quantity — our Mumbai desk responds with pricing, stock position and lead time, usually the same working day.
Frequently asked questions.
Answers to the questions our Mumbai desk is asked most often.
What is the difference between hot-rolled, cold-drawn and centreless-ground bar?
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Hot-rolled bar is the lowest-cost condition with a scaled or pickled surface and wide tolerance, suited to forging and rough machining. Cold-drawn bar is pulled through a die for a bright surface and h9 / h11 tolerance. Centreless-ground bar is ground to h6 / h7 with a fine finish and straightness better than 0.5 mm/m, which is what shafting and close-fit assemblies need.
Which stainless grade machines best?
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Grade 303 is the free-machining austenitic, with added sulphur that breaks chips and allows roughly 30% higher cutting speeds — ideal for high-volume turned parts. It has lower corrosion resistance and poorer weldability than 304, so use 304 or 316L where the part is welded or exposed to chlorides.
Can round bar be supplied to NACE MR0175 for sour service?
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Yes. 316L, Duplex 2205, Super Duplex 2507 and 17-4 PH (H1150 double-aged) are supplied with NACE MR0175 / ISO 15156 certification, hardness testing and heat-treatment records, with hardness capped at 22 HRC for austenitic and 32 HRC for duplex grades.
How do I calculate the weight of stainless round bar?
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Weight per metre = diameter² (mm) × density (g/cm³) × π ÷ 4000. For 316 at 8.00 g/cm³, a Ø 50 mm bar weighs 50² × 8.00 × 0.0007854 = 15.7 kg per metre. Our metal weight calculator does this for any grade, diameter and length.
Do you supply cut lengths or only full 6 m bars?
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We saw to your cut list from as short as 20 mm, with a length tolerance of about ±1 mm and squareness suited to direct chucking. Cut pieces carry the transferred heat number so full traceability is retained.
What is the largest diameter you can supply?
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Rolled bar is stocked to Ø 450 mm. Above that, we supply forged and peeled bar to Ø 800 mm from approved Indian forge shops, typically on a 4–6 week cycle, with ultrasonic testing to ASTM A388 where required.