AISI 304 / UNS S30400 (Austenitic) Stainless Steel
Chemistry, mechanical properties, physical properties, and practical selection notes for rolled AISI 304 products.
- General-purpose “18-8” stainless; excellent formability and weldability with broad corrosion resistance.
- Often specified for food, beverage, chemical, and general industrial environments.
Standards & Designations
- ASTM A240 ♦ ASTM A666 ♦ UNS S30400
Data Tables
- Most common 18-8 stainless; broad corrosion resistance and excellent formability/weldability.
| Chemical composition (wt%) | Limits |
|---|---|
| C | 0.08 max |
| Cr | 18.0–20.0 |
| Ni | 8.0–10.5 |
| Mn | 2.00 max |
| Si | 1.00 max |
| P | 0.045 max |
| S | 0.030 max |
| N | 0.10 max |
| Mechanical (annealed) | Requirements (min / max) |
|---|---|
| YS | 30 ksi min |
| UTS | 75 ksi min |
| Elongation | 40% min |
| Hardness | B92 max |
Values shown are typical/spec limits at room temperature unless noted; requirements vary by product form, size, and specification.
304 and 304L stainless steel from Source21 are the industry standard austenitic stainless steel grades trusted worldwide for their exceptional corrosion resistance strength and clean professional appearance. Often considered the classic stainless choice Type 304 delivers outstanding performance across a wide range of environments while 304L stainless steel features lower carbon content that enhances weldability and reduces the risk of carbide precipitation making it ideal for welded and fabricated assemblies. Both grades offer excellent forming and deep drawing capability along with hygienic properties well suited for food processing medical and sanitary applications.
Common uses include tanks sinks kitchen and medical equipment marine fittings architectural panels and electrical enclosures where durability and long term performance matter. Source21 supplies 304 and 304L stainless steel in coil, strip, sheet, foil, bar, and plate with finish options including 2B, BA, number 4, and mirror, all produced to meet ASTM A240, ASTM A666, AMS 5513 for 304, and AMS 5511 for 304L standards.
Contact the Source21 team today to place an order discuss finish or form options or get expert support in selecting the right stainless steel solution backed by reliable supply and responsive service.