420 Stainless Steel

Introduction

420 is a martensitic stainless steel, characterised by a high hardness and high carbon content. 

420 stainless steel is a higher carbon version of 410; and like most non-stainless steels it can be hardened by heat treatment. 

Properties

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 52HRC, 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.

Typical applications include fine cutlery, machine knives, surgical instruments, wear plates, cutting tools and knives and blades for the food processing industries.

Specifications

 Grade specifications for 420 grade stainless steel

Grade

UNS No

Old British

Euronorm

Swedish SS

Japanese JIS

BS

En

No

Name

420

S42000

420S37

56C

1.4021

X20Cr13

2303

SUS 420J1

These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.

Composition

 

Grade 420S45

Carbon0.28-0.36%Chromium12.00-14.00%
Manganese1.00% maxSulphur0.030% max
Silicon1.00% maxPhosphorous0.040% max
Nickel1.00% maxMolybdenum0.300% max