Steel Suppliers and stockholders - KV Steel Services, Darlaston, West Midlands


BS970 1983 on, PD970 2005 080A15, 080M15, 070M20.
BS970 1955 EN3A, EN3B, EN32B.
BSEN10083 C22, BS EN10084 C15/C16.
Werkstoff 1.0401, 1.0426, 1.0402, 1.1140, 1.1141, 1.1148, 1.1149, 1.1151 1.1208.
Related grades SAE 1015/1017/1020/1023.

General purpose steel bars for machining, suitable for lightly stressed components including studs, bolts, gears and shafts.  Often specified where weldability is a requirement.  Can be case-hardened to improve wear resistance.  Available in bright rounds, squares and flats, and hot rolled rounds.  Can be supplied in sawn blanks, and bespoke size blocks.

Chemical composition
(Ideal analysis to meet the majority of grades listed above)
Carbon 0.16-0.18%
Silicon 0.40% max
Manganese 0.70-0.90%
Sulphur 0.040% Max
Phosphorus 0.040% Max


Mechanical properties in cold drawn condition
Max Stress 400-560 n/mm2 dependent on ruling section
Yield Stress 300-440 n/mm2 Min dependent on ruling section
0.2% Proof Stress 280-420 n/mm2 Min dependent on ruling section
Elongation 10-14% Min dependent on ruling section


Advantages of using bright finished mild steel bars                  

Black mild steel is produced by a hot rolling process, and may have a scaly, rough surface. It is not precise in its dimensions, straightness or flatness. 

Suitable machining allowances should therefore be added when ordering.
It does not contain any additions for enhancing mechanical or machining properties.

Bright drawn mild steel is an improved quality material, free of scale, and has been cold worked (drawn or rolled) to size. It is produced to close dimensional tolerances.  Straightness and flatness are better than black steel. It is more suitable for repetition precision machining.

Bright drawn steel has more consistent hardness, and increased tensile strength.
Bright steel can also be obtained in precision turned or ground form if desired.

EN24T Steel Bar