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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 Non-Leaded steel is a Re-Sulphurised Free-Machining Steel. This is a premium grade of free-cutting steel. It has excellent machinability. It is suitable for case hardening and electroplating. We can provide you with free cutting steel both in the black and bright cold drawn bar form.
En1a steels are suitable for applications where good machinability is the prime consideration. Because of this, they are used for the rapid production on single or multiple spindle automatic lathes and capstan lathes of finely finished components that will not be subjected to high stresses in service, e.g. light duty studs, cycle components, and many intricate parts for textile and printing machinery. This type of steel cannot be relied upon to possess good transverse properties and should not be used for hollow parts which might be subjected to an internal pressure that would set up wall stresses dangerously near to the transverse yield stress. Case hardening can be carried out but this steel Is not recommended for general case hardening work and it is not intended for use where the hardened case is subject to severe impact in service.
Typical applications are:
BS970: 1955 EN1A, BS970/PD970: 1970 onwards 230M07.
Related European grades: 9SMn28, BS En 11SMn30
Werkstoff no. 1.0715
US Grades SAE (AISI) 1213, 1215.
Addition to other grades:
MS, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
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The following table shows the chemical composition of EN1A steel:
|Content(%)||0.07-0.15||0.10 Max||0.80-1.20||0.07 Max||0.2-0.3|
|Hardness, Brinell (typical)||300||33|
|Hardness, Rockwell C (typical)||30||30|
|Tensile strength, ultimate||965-1030 MPa||140000-150000 psi|
|Tensile strength, yield||827-862 MPa||120000-125000 psi|
|Elongation at break (in 50 mm (2″))||20.0%||20.0%|
|Compressive strength||862 MPa||125000 psi|
|Charpy impact (V-Notch)||27.1-33.9 J||20.0-25.0 ft-lb|
|Elastic modulus||190-210 GPa||27557-30457 ksi|
|FINISH||YIELD N/MM2||TENSILE N/MM2||ELONGATION MIN||HARDNESS HB|
Hardening:Flame and induction hardening may be carried out by heating quickly to the desired case depth and quenching in water or oil. This should be followed by a tempering treatment at 300-400ºF (150-200ºC) to reduce stresses in the case without affecting its hardness. A surface hardness of Rc 58 may be obtained by this treatment.
En1A can be tempered at 180-210 oC then should be left to cool in the air.
Welding is not recommended due to high sulfur and lead content.
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