420 is a martensitic stainless steel with 12% Chromium which is sufficient to give good corrosive resistance properties. .It’s best corrosive resistance is when hardened and surface is ground or polished.It has good ductility in the annealed condition but can be hardened up to 500HB (highest of the chromium grades). Martensitic grades are known for high hardness and allowances must be made for poor weldability and usually allowances for a final harden and temper treatment.
Stainless Steel 420 Round Bars Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 420 | 1.4021 | S42000 | SUS 420 J1 | 420S29 | - | - | FeMi35Cr20Cu4Mo2 |
SS UNS S42000 Round Bar Chemical Composition
| 420 | Max | Min |
| C | 0.15 | - |
| Mn | 1.00 | - |
| Si | 1.00 | - |
| P | 0.04 | - |
| S | 0.03 | - |
| Cr | 14.0 | 12.0 |
420 Stainless Steel Round Bar Mechanical & Physical Properties
| Element | SS 420 |
| Tensile Strength (PSI) | 95,000 |
| Yield Strength (PSI) | 50,000 |
| Reduction of Area | 55 |
| Elongation in 2" | 25 |
| Brinell Hardness | 175 |
Applications
Knives
Surgical Instruments
Fasteners
Shafts
Spindles
Plastic molds
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