Spring Steel Strip

Spring Steel Strip is the heart of our business.

Our experience in this product is extensive, and we have staff who have spent over forty years working in the steel manufacturing industry including many years with steel makers in the UK, Europe and North America, so if we are passionate about this product, please forgive us. If you are unsure of your requirements or simply need advice on choosing the right grade for your product, just call us.

At BSS we do not stock structural steels, tinplate, galvanised, angles, RSJ’s etc. For those products you can try your general local steel stockist. Spring Steel is what we do, and we do it well.

Spring steel strip is used for a wide range of products, and normally supplied either annealed to allow forming prior to heat treatment or ready hardened (sprung), for flat springs, saws, blades, cutting tools, clutch plates, shims etc.

We stock a range of spring steels in both conditions.

Annealed spring steel.

CS70 is the most common grade stocked in the UK. It is available in Europe as C67 and in the USA as 1070. It is nominal 0.70% carbon manganese steel with good formability and the possibility to harden to 1200 -1900 n/mm or 370-580 vpn. The hardening and tempering process takes place after forming.

Hardened and tempered spring steel

Hardened and tempered steel is commonly supplied as CS80 (C75 in Europe and 1075 or 1085 in the USA) or as CS95 (C100 in Europe and 1095 in the USA). As steel is hardened it becomes more brittle and the higher the carbon, the greater is this effect, so the CS80 and CS70 grades are used where flexibility is desirable and CS95 where toughness is a higher priority  (eg. saws and blades).

Stainless spring steel

Stainless spring steels are used mainly where exposure to water or other environmental contaminants or pollutants would cause the steel to rust or the spring to fail. the two main spring steel groups are austenitic and martenstitic. The austenitic grades (primarily 301) are temper rolled products that are used widely for general light springs. These grades can be formed  to make springs without the necessity for heat treatment, but it should be noted that the grain structure is highly directional, so care must be taken with tooling and bend angles. The martensitic steels (primarily 420) are heat treatable and whilst high hardnesses can be achieved, they tend to be brittle, and are used more commonly for the manufacture of blades and cutting tools, where bending and flexing is not a major issue.