Steel grade EN3

EN3 (070M20) Engineering steel

EN3A and EN3B are general engineering steels, suitable in applications where heavy stresses and heat treatment are not involved, such as welded and riveted structures, forgings, machined parts and hot pressing. High Peak Steels stock this in a range of sizes and shapes.

It is a bright drawn, or turned, mild steel with good machinability. Ideal for use in a variety of general engineering applications. EN3A and EN3B can be case hardened and is normally supplied in the as drawn / as turned condition. EN3A and EN3B steel will withstand a moderate amount of cold deformation and only offers low strength but good machinability. The material has good weldability characteristics however it has poor hardenability.

Overall a general-purpose mild steel, readily weldable and suitable for case hardening.

Flat sections are of particular suited to tool makers.

For wider applications where case hardening is critical engineers can choose, EN3B with a refined analysis that conforms to EN32 (080A15).

Steel stock range

High Peak Steels stock EN3 (070M20) in the following ranges…

BRIGHT STEEL: round bar | flat bar | square bar | hexagonal bar
BLACK STEEL: round bar | flat bar | square bar

Associated standards

UK Standard EN3A | European Grades C15, C20, ST52-3, S235 | Werkstoff 1.0402, 1.0401, 1.1151 | SAE/AISI 1020

Call now on 01457 866911

to talk to one of our advisors for more information, or email us at sales@highpeaksteels.com

EN3A (070M20) black steel


Product
Metric
Min size

Max size
codes-round26mm dia800mm dia
codes-flat213mm x 3mm200mm x 20mm
codes-square220mm100mm
codes-hex2

EN3B (070M20) bright mild steel


Product
Metric
Min

Max
 Imperial
Min

Max
codes-round26mm dia200mm dia3/16" dia8" dia
codes-flat213mm x 3mm300mm x 25mm1/4" x 1/8"12" x 2"
codes-square220mm100mm3/16"6"
codes-hex27mm A/F65mm A/F.312" A/F2.76" A/F

EN3 (070M20) Chemical Composition

 CSiMnSPCrNiMo
Min0.160.10.5
Max0.240.40.90.050.050.30.40.15

EN3 (070M20) Mechanicals

 Yield
N/mm2
0.2% proof
N/mm2
UTS (Rm)
N/mm2
Elong (A)
%
Red of Area (Z)
%
Hardness
HB
Normalised (min)21543021126
Normalised (max)
Drawn (min)42053012179
Drawn (max)

Typical Applications of EN3 steel

  • HAULAGE GEAR
  • COMMUTATOR SCREWS
  • WAGON BUFFERS
  • VALVE GATE AND BODY FORGINGS
  • MOTOR CAR WHEEL HUBS
  • SHAFTS
  • STAYBOLTS
  • BRAKE
  • PEDAL LEVERS
  • CAGE SUSPENSIONS
  • GEAR SELECTORS
  • VARIOUS MOTORCYCLE LEG STAMPINGS
  • CLUTCH & BRAKE HOUSING