ASTM A276 / A276M UNS S21904
ASTM A276 UNS S21904 is a material grade specification for cold-finished or hot-finished bars in S21904 stainless steel, available in form of rounds, square, hexagons and other hot rolled extruded shapes. Ferrobend uses S21904 bar stock to ASTM A276 specifications for manufacturing stainless steel S21904 bolts, nuts, screws, studs, threaded rods, other fasteners and bar stock components for general engineering purposes.
ASTM A276 specification covers requirements such as chemical composition, mechanical properties, heat treatment and other supplementary requirements for S21904 stainless steel round bars, square bars, hexagon bars and other extruded shapes.
Chemical Composition
| Identification Symbol | UNS Number | Elements | Composition % |
|---|---|---|---|
| XM - 11 | S21904 | Carbon | 0.04 max |
| Manganese | 8.00 - 10.00 | ||
| Phosphorus | 0.045 max | ||
| Sulfur | 0.030 max | ||
| Silicon | 1.00 max | ||
| Chromium | 19.00 - 21.5 | ||
| Nickel | 5.5 - 7.5 | ||
| Nitrogen | 0.15 - 0.40 |
Mechanical Properties
| Property | Value |
|---|---|
| Finish | Hot-Finished & Cold Finished |
| Tensile Strength, min, ksi [MPa] | 90 [620] |
| Yield Strength, min, ksi [MPa] | 50 [345] |
| Elongation in 2 in. [50mm] or 4D, min, % | 45 |
| Reduction or Area, min, % | 60 |
| Brinell Hardness Number, HBW | -- |
