NAS 304-SR； Stainless Steel for Etching
Characteristics of NAS 304-SR
Residual stress is removed by SR (Stress Relief) treatment in manufacturing process to prevent from changing its shape during etching process.
Chemical Composition
(%)
| - | C | Si | Mn | P | S | Ni | Cr |
| Specification | ≦0.08 | ≦1.00 | ≦2.00 | ≦0.045 | ≦0.030 | 8.00〜 10.50 |
18.00〜 20.00 |
| Example | 0.036 | 0.67 | 1.05 | 0.030 | 0.0032 | 8.50 | 18.09 |
Mechanical Properties
| - | Thickness x Width (mm) | Finish | Tensile strength （MPa） |
Elongation （％） |
Hardness （HV） |
| Example | 0.2×300 | H | 1123 | 12 | 372 |
Application
| Application | Process |
| Coated mask for thin film circuit | Photo etching process |
| Spring for telephone switch relay | |
| Metal filter | |
| Discharge tube electrode | |
| Code plate for measuring instrument | |
| Optical slit | |
| Core alignment plate |
Half Etching Test for H finish SUS304 of 0.2mm thick samples
(Upper: without SR treatment. Lower: with SR treatment)
0 mm curved for SR treated material whereas 22 mm curved for no SR treated one.
