EN24

Grade Introduction:
EN24 Alloy Steel is a very high-strength steel alloy that is supplied hardened and tempered. The grade is a nickel-chromium molybdenum combination – this offers high tensile steel strength, with good ductility and wear resistance characteristics. With relatively good impact properties at low temperatures, EN24 is also suitable for a variety of elevated temperature applications. EN24 sections larger than 250mm may still be available in the quenched and tempered condition, but it should be noted that a fall-off in mechanical properties may be apparent approaching the center of the bar. It is therefore recommended that larger sizes are supplied in the annealed (softened) condition and that quenching and tempering are carried out after initial stock removal. This should achieve better mechanical properties towards the core.

Grade Application

  • High strength shafts
  • Punches & dies
  • Drill bushings
  • Retaining rings
  • Gears

Equivalent Grades

  • BS 970:1955 EN24T
  • BS 970:1991 817M40T
  • German / DIN 34CrNiMo6
  • French AFNOR 35NCD6
  • American AISI / SAE 4340
  • German Werkstoff No. 1.6582
  • European Standard EN10277-5

Addition to other grades

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, DIN1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTMSA-105, SAE1018, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.

Our Supply Range

We supply to automotive ancillaries and OEM customers. The products we manufacture are used as input for manufacturing of automotive and general engineering components. These components are further assembled into systems fitted in automobiles and other engineering applications.

Product Type Size Range
Forged Round Bars 140mm Dia to 850mm
Rolled Round Bars 16mm Dia and above
Forged Flat Bars Thickness: 32mm to 510mm, Width: 65mm to 1050mm
Rolled Flat Bars Thickness: 6mm to 110mm, Width: 25mm to 510mm

Chemical Composition

The following table shows the chemical composition of EN24 steel:

Element
C
Si
Mn
P
S
Cr
Mo
Ni
Content (%)
0.36-0.44
0.10-0.35
0.45-0.70
0.035 Max
0.040 Max
1.00-1.40
0.20-0.35
1.30-1.70

Heat Treatment

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of alloy steel.

Hardness

248 – 302

Hardening

EN24 is supplied ready heat treated. If further heat treatment is required annealed EN24 should be heated slowly to 830-850°C and after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature. Hardening from a neutral salt bath, will reduce the possibility of scaling or decarburization. Heat to 830-850°C and after equalization quench in oil.

Thermal Properties

Thermal conductivity – 41.9 W/m-°C

Forging Properties

Preheat carefully, then raise temperature to 1000-1100°C for forging. Do not forge the steel below 850-1100°C. After forging cool slowly preferably in a furnace.

Stress Relieving

When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening. Heat carefully to 650-670°C, soak well before cooling in the furnace or in the air.

Welding

When welding is completed allow components to cool to 180°C before Post Weld Heat Treatment.

Mechanical Properties

Condition
Tensile
N/mm²
Yield
N/mm²
Elongation
%
Izod
KCV J
Hardness
Brinell
T
850-1000
650
13
35
248-302
U
925-1000
755
12
42
269-331
V
1000-1150
850
12
42
293-352
W
1075-1225
940
11
35
311-375
X
1150-1300
1020
10
28
341-401
Y
1225-1375
1095
10
21
363-429
Z
1550
1235
5
9
444

Physical Properties

Thermal conductivity at °C
W/(m*k)
40.5
20
32.5
350
25.5
700

Normalizing

  • Nominal normalizing temperature:840-900°C.
  • Hold the temperature for several hours.
  • Cooling in the air.

Annealing

Heat slowly to 840-860°C, soak well and allow to cool with the furnace to 580°C, before withdrawing.

Density

Density – 7840 kg/m3

Machinability

EN24 is a very popular grade of through-hardening alloy steel, which is readily machinable in the “T” condition.

Supply Cities

Ambattur, Bangalore, Chennai, Coimbatore, Dindigul, Guindy, Madurai, Nellore, Hyderabad, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Kanyakumari, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore, Karur, Nagercoil, Kanchipuram, Karaikudi, Pudukottai, Nagapattinam.

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