FREE CUTTING STEEL GRADE EN 1A

EN1A is a very popular grade of low carbon-manganese free cutting steel, which is most suitable for the manufacture of repetition turned components, such as nuts, bolts, hydraulic fittings and studs, particularly where intricate drilling and machining operations are involved. It can be case-hardened, producing components with enhanced wear resistance. EN1A, also known as 230M07. EN1A is low carbon mild steel. Properties: free cutting, suitable for machining using both automatic and CNC machines. Available in square, round, flat or hexagon form. Equivalent to AISI 1113.

Chemical Composition

Properties Metric Imperial
Carbon, C 0.07 0.15
Manganese, Mn 0.80 1..20
Silicon, Si 0.00 0.10
Sulfur, S 0.02 0.03
Phosphorous, P 0.00 0.07

Mechanical Properties

Max Stress 370-480 n/mm2 Min dependent on ruling section
Yield Stress 240-400 n/mm2 Min dependent on ruling section
0.2% Proof Stress 225-360 n/mm2 Min dependent on ruling section
Elongation 6-10% Min dependent on ruling section

EN1A Equivalents

BS970: 1955 EN1A
BS970/PD970: 1970 onwards 230M07
European 9SMn28, BS En 11SMn30
Worst-off No. 1.0715
US SAE (AISI) 1213, 1215
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.