EN3B Bright 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 normal 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 reduce machining costs. Another benefit of bright Steel bars is a marked increase in physical strength over hot rolled bars of the same section.

EN3B bright Mild Steel (070m20) used to be the most popular specification of bright Mild Steel available. It has since been replaced by steels that have a tighter chemical analysis.

EN3B Bright Mild Steel is now a general purpose Steel that is suitable for welding, can be case-hardened and is good for general machining. EN3B is generally used in engineering applications that will not be heavily stressed. 

Heat Treatment   

Chemical Composition of EN3B Steel

  C Mn Si P S
Min 0.16 0.50      
Max 0.24 0.90 0.35 0.05 0.05



Welding EN3B Steel

Mechanical Properties of EN3B Steel

Condition Tensile Strength

MPa Min.

Yield Strength

MPa Min.

Elongation %
Cold drawn 560 440 10
Turned & Polished 430 215 21



International Comparisons of EN3B Steel

British BS 970:1991 070M20
Swedish SS 1370
German DIN CK20
American SAE 1021
French AFNOR XC18
European Standard EN10083-1
European Steel No. 1.1151
European Steel Name C22E
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