EN1A Mild Steel

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The term Mild Steel applies to all low carbon steel that does not contain any alloying elements in its makeup and has a carbon content that does not exceed 0.25%. The term “Mild” is used to cover a wide range of specifications and forms for a variety of Steel.

Mild Steel is used in mechanical engineering applications for parts that will not be subject to high stress.

When in its bright cold drawn condition the steel is able to endure higher levels of stress, particularly on smaller diameters.

Compared to regular mild Steel, bright mild steel provides tighter sectional tolerances, increased straightness, and a much cleaner surface. The main advantage of cold drawn Steel is that Steel can be brought closer to the finished machine size, providing reduces machining costs. Another benefit of bright Steel bars is a marked increase in physical strength over hot rolled bars of the same section.

EN1A (also known as BS 970 230M07) is bright Mild Steel noted for its low carbon content. This Steel is especially good for free cutting, where a large volume of products are required.

It can be formed by rolling or drawing and the machining of EN1A is fine of both automatic and CNC machines. 


Heat Treatment 

Carbonisation of EN1A bright Mild Steel takes place at 900-950 °C (1652 °F- 1742 °F) then it is furnace or air cooled.

EN1A can be tempered at 180-210 °C (356 °F- 410 °F) then should be left to cool in air.

The Mild Steel can be hardened at 780-800 °C (1436 °F- 1472 °F) then quenched in oil or water. However, this is difficult to do with EN1A and is not recommended. 

Chemical Composition of EN1A Steel

  C Mn Si P S
Min     0.10 0.07 0.30
Max 0.15 1.00 0.35 0.06 0.60


Welding EN1A Steel

Due to the low carbon content of EN1A it is not recommended that this Mild Steel is used for welding. 

Mechanical properties of EN1A steel

Condition Tensile Strength

MPa Min.

Yield Strength

MPa Min.

Elongation %
Cold drawn 400 290 7-9
Turned & Polished 370 230 18


International Comparisons of EN1A

British BS 970:1991 230M07 Pb
Swedish SS 1914
German DIN 9SMn28Pb
American SAE 12L14
French AFNOR S250Pb
European Standard EN10277-3
European Steel No. 1.0718
European Steel Name 11SMnPb30