420J2
HuaNickel 420 is a hardenable martensitic stainless steel with a similar chemical composition to 410, mainly due to the difference in carbon content. HuaNickel 420 stainless steel has a lower carbon content than 410, which allows it to achieve higher strength and hardness at lower ductility. HuaNickel 420 has corrosion resistance comparable to 410 and is typically used in applications that require high strength, high wear resistance, or good edge retention.
420J2 Chemical composition：
| Fe | C | Mn | P | S | Si | Cr | |
| Min | Bal | 0.15 | – | – | – | – | 12 |
| Max | – | 1 | 0.04 | 0.03 | 1 | 14 |
420J2Physical properties：
| Density | 0.278 lb/in3 |
| Melting point | 2650 – 2750°F |
| Poisson’s ratio | 0.28 |
| Resistivity | 25.6 µΩ • in |
| Coefficient of thermal expansion（68°F-212°F） | 5.833 µin/in •°F |
| Thermal conductivity（212°F） | 14.4 BTU/(hr•ft•°F) |
420J2Mechanical properties：
| The temperature becomes warmer，°F | Ultimate tensile strength，ksi | 0.2% yield strength，ksi | hardness，HRC |
| anneal | 85.8 | 51.5 | 163 HBW |
| 440 | 255.2 | 190.1 | 48 |
| 550 | 229.6 | 176 | 44 |
| 600 | 232.9 | 179 | 45 |
| 800 | 326 | 185.6 | 46 |
| 900 | 233 | 179.3 | 46 |
| 1000 | 158.5 | 137.9 | 36 |
| 1200 | 121.6 | 94.6 | 23 |
420J2Stainless steel characteristics：
High Carbon Variant 410
The achievable strength and hardness are higher than HuaNickel 410 compared to 410
High abrasion resistance and edge retention
420J2Uses of stainless steel：
Industrial chains, bearings, firearms, surgical instruments, pumps and valves, plastic injection molds and molds, etc
Relevant standards：
AMS: 5621, QQ-S763
ASTM: A276, A484