EN 1A Series Steel

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 is also available as En1a leaded (En1aPb) for greater machinability.  Swarf will form in small chips to prevent machine blockage.

EN1A is a non leaded Re-Sulphurised Free Maching Steel. This is premium grade of free cutting steel. It has excellent machinability. It is suitable for case hardening and electroplating. Typical applications are: Brake hose end, hydraulic parts, pulleys, disc brake pistons, wheel nuts and inserts, control linkages, hear box components (case hardened), domestic garbage bin axles, concrete anchors, padlock shackles, hydraulic fittings, vice jaws. En1a steel bars are used mostly in bright form.

EQUIVALENT GRADES OF EN1A STEEL ARE AS FOLLOWS

  1. AISI – 1213 ,1215
  2. BS970: 1991 – 230M07
  3. Werkstoff –  1.0715
  4. Related European grades: 9SMn28, BS En 11SMn30

Chemical composition

Element Min Max
Carbon, C 0.07 0.15%
Manganese, Mn 0.8 1.20%
Silicon, Si 0 0.10%
Sulfur, S 0.2 0.3
Phosphorous, P 0 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

S970: 1955 EN1A
BS970/PD970: 1970 onwards 230M07
European 9SMn28, BS En 11SMn30
Worst-off No. 1.0715
US SAE (AISI) 1213, 1215

 

Heat Treatment

    1. Carbonisation of EN1A bright mild steel takes place at 900-950oC (1652oF- 1742oF) then it is furnace or air cooled.
    1. En1A can be tempered at 180-210 oC (356 oF- 410oF) then should be left to cool in air.
    1. The mild steel can be hardened at 780-800oC (1436oF- 1472oF) then quenched in oil or water. However this is difficult to do with EN1A and is not recommended.

 

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