ASTM A276 / A276M UNS S21900
ASTM A276 UNS S21900 is a material grade specification for cold-finished or hot-finished bars in S21900 stainless steel, available in form of rounds, square, hexagons and other hot rolled extruded shapes. Ferrobend uses S21900 bar stock to ASTM A276 specifications for manufacturing stainless steel S21900 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 S21900 stainless steel round bars, square bars, hexagon bars and other extruded shapes.
Chemical Composition
| Identification Symbol | UNS Number | Elements | Composition % |
|---|---|---|---|
| XM - 10 | S21900 | Carbon | 0.08 max |
| Manganese | 8.0 - 10.0 | ||
| 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 | -- |
