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3J21 alloy has no magnetic, corrosion resistance, high elasticity, high strength and good fatigue resistance. It applies to manufacture spring, winding watches, and other elastic elements working at temperatures below 400 ℃ or corrosive media. Similar alloy's names in different standards:
Beiye designation | China Standard designation | International designation |
3J21 | 3J21 |
C | 0.07～0.12 | Ni | 14.00～21.00 |
Si | ≤0.60 | Cr | 19.00～21.00 |
Mn | 1.70～2.30 | Co | 39.00～41.00 |
P | ≤0.01 | Mo | 6.50～7.50 |
| S | ≤0.01 | Fe | Bal. |
(1) Strip
A group | B group | |
Tensile Strength | 1178～1470 MPa | 1470～1764 MPa |
Elongation | ≥5% | ≥3% |
(2) Wire
A group | B group | |
Tensile Strength | 1274～1568 MPa | 1568～1862 MPa |
Elongation | ≥5% | ≥3% |
Density | 8.4 g/cm3 (0.30 lb/in3) |
Thermal expansion(20~100℃) | 14.0×10 -6/K |
Resistivity | 0.92 µΩ•m |
Strip and Wire
Aging process: Heating temperature 500℃, holding 240min; Push the furnace cooled quickly; Long average temperature furnace cooling.
