ASTM Grade 420 stainless steel is a higher carbon version of 410; like most non-stainless steels it can be hardened by heat treatment. It contains a minimum of 12 per cent chromium, just sufficient to give corrosion resistance properties. It has good ductility in the annealed condition but is capable of being hardened up to Rockwell Hardness 50HRC, the highest hardness of the 12 per cent chromium grades. Its best corrosion resistance is achieved when the metal is hardened and surface ground or polished.
Composition ranges for 420 grade stainless steel
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 420 | min. max. | 0.15 - | - 1.00 | - 1.00 | - 0.040 | - 0.030 | 12.0 14.0 | - | - | - |
Physical properties of 420 grade stainless steel in the annealed condition
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion |
Thermal Conductivity |
Specific Heat 0-100°C |
Electrical Resistivity (nW.m) |
|||
|
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
|||||
|
420 |
7750 |
200 |
10.3 |
10.8 |
11.7 |
24.9 |
- |
460 |
550 |
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