Chemical Composition (%) of 420 Stainless Steel Plate
| C | Mn | Si | P | S | Cr |
| 0.15 | 1.00 | 1.00 | 0.04 | 0.03 | 12.0-14.0 |
Mechanical Properties of 420 Stainless Steel Plate
| Tempering Temperature (°C) | Tensile Strength (MPa) |
Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness Brinell (HB) |
| Annealed * | 655 | 345 | 25 | 241 max |
| 399°F (204°C) | 1600 | 1360 | 12 | 444 |
| 600°F (316°C) | 1580 | 1365 | 14 | 444 |
| 800°F (427°C) | 1620 | 1420 | 10 | 461 |
| 1000°F (538°C) | 1305 | 1095 | 15 | 375 |
| 1099°F (593°C) | 1035 | 810 | 18 | 302 |
| 1202°F (650°C) | 895 | 680 | 20 | 262 |
| * Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum. | ||||
Physical Properties of 420 Stainless Steel Plate
|
Density kg /m3 |
Thermal Conductivity W/mK |
Electrical Resistivity (Microhm/cm) |
Modulus of Elasticity |
Coefficient of Thermal Expansion μm/m/°C |
Specific Heat (J/kg.K) |
| 7750 | 24.9at 212°F | 550 (nΩ.m) at 68°F | 200 GPa | 10.3 at 32 – 212°F | 460 at 32°F to 212°F |
Alloy 420 is a hardenable, martensitic stainless steel that is a modification of Alloy 410. Similar to 410, it contains a minimum of 12% chromium, just sufficient enough to give corrosion resistant properties.
Alloy 420 has higher carbon content than Alloy 410 which is designed to optimize strength and hardness characteristics. It has good ductility it the annealed condition but is capable of being hardened up to Rockwell hardness 50 HRC, the highest hardness of the 12% chromium grades.
Due to its hardening properties, Alloy 420 is not often welded, although it is possible. Martensitic stainless steels are designed for high hardness and sometimes other properties are to some degree compromised.
Corrosion resistance is lower than the common austenitic grades and their useful operating range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures. Its best corrosion resistance is achieved when the metal is hardened and surface ground or polished.
If you are interested in other Stainless Steel Plates/Sheets, please click 302, 303, 304, 304L, 304H, 309, 309S, 310, 310S, 310H, 316, 316L, 317/317L, 317LMN, 321, 321H, 330, 347, 347H, 904L, 403, 405, 409, 410, 410S, 410/HT, 416, 416HT, 420, 422, 430, 440C, Duplex 2205, Duplex 2304, Duplex 2507.
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