+44 (0) 114 244 0527

CS70 carbon spring steel



CS70 is a grade within BS1449. 

It is the equivalent to C67S and AISI /SAE 1070. 

Considered a high carbon steel is used in the manufacture of springs,In the annealed condition (normally 185 vpn max)  it can be pressed, formed etc. and is normally hardened and tempered after shaping operations. We hold stock from 0.20mm through to 3.25mm. Whilst we can supply single sheets our minimum quantity for strip in coil is 10 kilos

An alternative grade for light spring manufacturing, without the necessity to heat treat after forming is 301 spring temper stainless. BSS stock a wide range of 301. If you need more information call us.


Carbon0.65-0.75%Phosphorous0.045% max
Manganese0.50-0.90%Sulphur0.045% max

Our range

We supply CS70 annealed in a range of sheet sizes, from 0.3mm to 3mm thick.

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.


CS70 is a high carbon spring steel, and part of the UK designation BS1449. Used in the manufacture of a wide variety of springs, it is normally purchased in the annealed condition. Annealed material allows the steel to be formed and shaped prior to hardening

CS70 is equivalent to AISI/ SAE 1070, Din CK67 and Euronorm EN10132 C67S

StandardGradeC %Si %Mn %S %P %
BS1449 (UK)CS700.65/0.750.05/0.350.50/0.900.025max0.025max
EN10132 (Europe)C67S0.65/0.730.15/0.350.60/0.900.025max0.025max
DIN 17222(Germany)CK670.65/0.720.25/0.500.60/0.800.025max0.025max
SAE (USA)10700.64/0.760.15/0.300.60/0.900.035max0.035max

BSS Steelstrip can supply CS70 in thicknesses from 0.20mm through to 3.25mm and close equivalents (75CR1) up to 8.30mm in coil strip or sheet. We can offer in coil or single sheets in 300mm x 1000mm in a range of thickness’s. For heavier requirements we can offer Hot rolled annealed in sheet up to 8mm thickness.

Stock sheets available for next day despatch

  • 300mm x 0.30 x 1000mm
  • 300mm x 0.40 x 1000mm
  • 300mm x 0.50 x 2000mm
  • 300mm x 0.71 x 2000mm
  • 300mm x 1.00 x 2000mm
  • 300mm x 2.00 x 2000mm
  • 310mm x 2.64 x 2000mm

We have other sizes in stock too, please call to check.