Available Shapes
420 Stainless Steel
Alloy 420 / SS420 / 1.4021 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 to a minimum Rockwell hardness of 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.
Related Specifications
1.4021 1.4028 1.4034 1.2083 ASTM A276 S42000
BS EN 10088 AISI BS970 UNS X20Cr13 X30Cr13
Applications
Analysis 420S29
Analysis 420S37
Analysis 420S45
Analysis 1.2083
Analysis 1.4034
Hardening
Applications
Alloy 420 is used for a variety of applications where good corrosion and outstanding hardness is necessary. It is not usually used at temperatures exceeding 800oF (427oC) due to quick hardening and loss of corrosion resistance. Examples of applications that use alloy 420 include: Cuttery
Knife blades
Surgical instruments
Needle valves
Shear blades
Scissors
Hand tools
Analysis 420S29
Carbon | 0.14-0.20% | Chromium | 11.50-13.50% |
Manganese | 1.00% max | Sulphur | 0.030% max |
Silicon | 1.00% max | Phosphorous | 0.040% max |
Nickel | 1.00% max | Molybdenum | 0.300% max |
Analysis 420S37
Carbon | 0.20-0.28% | Chromium | 12.00-14.00% |
Manganese | 1.00% max | Sulphur | 0.030% max |
Silicon | 1.00% max | Phosphorous | 0.040% max |
Nickel | 1.00% max | Molybdenum | 0.300% max |
Analysis 420S45
Carbon | 0.28-0.36% | Chromium | 12.00-14.00% |
Manganese | 1.00% max | Sulphur | 0.030% max |
Silicon | 1.00% max | Phosphorous | 0.040% max |
Nickel | 1.00% max | Molybdenum | 0.300% max |
Analysis 1.2083
Carbon | 0.36-0.42% | Chromium | 12.50-14.50% |
Manganese | 1.00% max | Sulphur | 0.030% max |
Silicon | 1.00% max | Phosphorous | 0.030% max |
Analysis 1.4034
Carbon | 0.43-0.50% | Chromium | 12.50-14.50% |
Manganese | 1.00% max | Sulphur | 0.015% max |
Silicon | 1.00% max | Phosphorous | 0.040% max |
Hardening
Soak at 1850-1950 F to quench in heated oil.