AISI 304 JIS SUS304L DIN 1.4306
Qilu
Product Description
Solution annealed 304 and 304L round bar from 6 mm to 200 mm, hot rolled, forged or cold drawn. The standard 18Cr-8Ni austenitic grade for food, chemical, architectural and general corrosion service — supplied with EN 10204 3.1 certification.
Equivalent to: AISI 304 / 304L (UNS S30400 / S30403, ASTM A276 / A240) · EN 1.4301 / 1.4307 (EN 10088-3) · JIS SUS304 (G4303) · GB 06Cr19Ni10 / 022Cr19Ni10
AISI 304 / SUS304 Stainless Steel Round Bar
AISI 304 / SUS304 Stainless Steel Round Bar
AISI 304 / SUS304 Stainless Steel Round Bar
Supply form — Round bar, flat bar, hexagon and square
Process — Hot rolled / forged; cold drawn for close tolerance and bright surface
Condition — Solution annealed (pickled or peeled); cold drawn as option
Diameter range — 6–200 mm (hot rolled / forged); 3–80 mm (cold drawn)
Melting route — EAF + LF + AOD
Standard — ASTM A276 / A240, EN 10088-3, JIS G4303, GB/T 1220
Certificate — EN 10204 3.1 standard, 3.2 on request
Lead time — 15–30 days
304 is the reference austenitic composition: about 18 % chromium for passivation and 8 % nickel to keep the structure fully austenitic, so the steel stays non-magnetic and tough at cryogenic temperature. The L variant drops carbon below 0.030 % so that welding does not sensitise the grain boundaries — if the bar will be welded and then exposed to corrosive media, 304L is the safer call; otherwise 304 gives slightly higher strength from its higher carbon.
| Element (%) | AISI 304 (S30400) | AISI 304L (S30403) | EN 1.4301 | EN 1.4307 | JIS SUS304 |
|---|---|---|---|---|---|
| Carbon (C), max | 0.08 | 0.030 | 0.07 | 0.030 | 0.08 |
| Manganese (Mn), max | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 |
| Silicon (Si), max | 0.75 | 0.75 | 1.00 | 1.00 | 1.00 |
| Phosphorus (P), max | 0.045 | 0.045 | 0.045 | 0.045 | 0.045 |
| Sulfur (S), max | 0.030 | 0.030 | 0.015 | 0.015 | 0.030 |
| Chromium (Cr) | 18.00–20.00 | 18.00–20.00 | 17.5–19.5 | 17.5–19.5 | 18.00–20.00 |
| Nickel (Ni) | 8.00–10.50 | 8.00–10.50 | 8.0–10.5 | 8.0–10.5 | 8.00–10.50 |
| Nitrogen (N), max | 0.10 | 0.10 | 0.11 | 0.11 | — |
Austenitic stainless steel is not hardenable by heat treatment — strength comes from the annealed structure plus any cold work. The figures below are the annealed minimums of ASTM A276 and JIS G4303; cold drawing raises both yield and tensile substantially, at the cost of increased magnetism and residual stress.
| Property (annealed) | ASTM A276 304 / 304L | JIS G4303 SUS304 |
|---|---|---|
| Tensile strength, min | 515 MPa | 520 MPa |
| Yield strength (0.2%), min | 205 MPa | 205 MPa |
| Elongation, min | 40 % | 40 % |
| Hardness, max | 201 HB (92 HRB) | 187 HB |
| Density | 8.00 g/cm³ | 8.00 g/cm³ |
| Standard | Designation | UNS / Material No. |
|---|---|---|
| ASTM A276 / A240 (US) | 304 / 304L | S30400 / S30403 |
| EN 10088-3 (EU) | X5CrNi18-10 / X2CrNi18-9 | 1.4301 / 1.4307 |
| JIS G4303 (JP) | SUS304 / SUS304L | — |
| GB/T 1220 (CN) | 06Cr19Ni10 / 022Cr19Ni10 | — |
Food & beverage — tanks, pipework, conveyor parts and hygienic equipment
Chemical process — vessels and fittings for mild organic acids and dilute solutions
Architecture — railings, facades and structural trim, indoor and mild outdoor exposure
General engineering — shafts, fasteners, valve and pump components in non-chloride media
304 is supplied solution annealed: held at 1010–1100 °C and rapidly cooled in water or air jet. That treatment dissolves carbides and restores full corrosion resistance. The grade cannot be through-hardened by quenching — strength is raised by cold work only. Avoid long service or slow cooling in the 450–850 °C range with standard carbon 304: chromium carbides precipitate at grain boundaries and sensitise the steel. Where the bar will be welded, specify 304L, or stabilised 321 if the service temperature cycles through that range.
Melting & forging — EAF + LF + AOD refining, hot forged and rolled bar from 6 mm to 200 mm
Solution annealing — annealed at 1010–1100 °C and rapidly cooled, with furnace charts recorded per batch
Machining shop — peeling, rough turning, cutting to length and polishing for bar that arrives finish-ready
Testing — eddy current and ultrasonic inspection, intergranular corrosion test per ASTM A262 on request, hardness and tensile testing
Certification — EN 10204 3.1 as standard, 3.2 available with third-party witness (ABS, BV, CCS, GL)
Export packing — bundled, end-capped and protected for sea freight
Not in the annealed condition. Cold drawing or bending converts part of the austenite to martensite, so a cold drawn bar will pull slightly on a magnet — that is metallurgy, not a substitute grade.
If the service medium contains chlorides — seawater, coastal air, brines, bleach — pay for 316L. For fresh water, food acids and indoor atmospheres, 304 is sufficient. We break the decision down in our 304 vs 316 article.
Yes. Peeled and polished bar is machined in our own shop, so tolerance and surface finish are controlled in one place instead of two.
Send us your diameter, length, quantity and required surface condition. You will get a quotation with the full technical proposal within 24 hours.
Email: enquiry@qilumetal.com | Web: www.qilumetal.com
