+44 (0) 114 244 0527

420 Stainless Steel


420 is a martensitic stainless steel with rust resistant properties. It is characterised by a high hardness and high carbon content which provides both outstanding corrosion resistance and exceptional wear resistance. 

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

We supply 420 stainless steel sheet and 420 stainless steel coil.  


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.



Grade 420S37   (1.4021)

Manganese Sulphur0.030% max
Silicon1.00% maxPhosphorous0.040% max

Grade 420S45 (1.4034  –   X46Cr13)

Manganese1.00% maxSulphur0.030% max
Silicon1.00% maxPhosphorous0.040% max
Nickel1.00% maxMolybdenum0.300% max

Our range

We stock 420 in a range of thicknesses from 0.5mm to 3.00mm thick, in sheet and in coil. Our stock is hardened and tempered, suitable for manufacturing flat springs and blades. We can also offer a cutting or profiling service. 

The material we stock is usually hardened in the range of 48/52HRC.  Also, we hold some stock in 420 annealed from 1.5 mm to 6.5mm thickness. 

Alternatively we stock grade 301 strip which is an austenitic grade. 301 is suitable for forming springs without the need for subsequent hardening.

We do not supply Mill Certificates with orders, we only supply Certificates of Conformity.

Please contact us on 0114 244 0527 (option 2) to make an enquiry.

BSS are specialists at supplying small quantities of spring steel strip to a wide range of customers across the globe. Stocking a range of grades in sheet and coil with friendly, expert service and fast dispatch, BSS are your ideal steel supply partner.
Spring Steel Strip - BSS are leading suppliers of spring steel strip in sheet and coil - specialising in supplying small quantities
Spring Steel supplied in sheet by BSS Spring Steel Strip