EN 31 is a high strength steel alloy that is also known as 4340. It is supplied, tempered, and hardened. It is popular and widely used due to its excellent strength in numerous components, including bolts, gears, and studs. Other grades can be surfaced-hardened to create parts with improved water resistance through nitriding or induction.

EN 31 is generally supplied in a final heat-treated condition. It is a popular grade of through-hardening alloy steel, which is also machinable in the “T” condition. EN31 is best-suited for use in heavy-duty commercial shafts, axles, and other components. The steel alloy can maintain good impact value at even lower temperatures, so it is frequently used for offshore applications.

The strength of EN31 is excellent. It is a combination of nickel-chromium-molybdenum and offers incredible tensile strength with excellent ductility and resistance to water. It performs well for use at higher temperatures as well. EN31 is a suitable material that treats quickly and is supplied already tempered.

As a standard high-speed steel grade, EN31 is a well-balanced alloy composition. It forms the basis of durability, edge retention, and rendering. It is perfect for a wide variety of applications that require flexibility.

Available Types & Range

Form of Supply Size(mm) Length(mm)
Round bar Φ 16 -Φ 140 Standard or As your request
Forged Rounds Φ 140  – Φ 650 Standard or As your request
Forged Flats Thickness : 65 – 450
Width: 130 – 650		 Standard or As your request

EN – 24 ROLLED ROUNDS

6 mm to 150  mm Dia

Brand – , LSRM,JAILAXMI, KISCO

EN 24 – FORGED ROUND

Size – 130 mm to 670 mm Dia

Brand – Kolkatta& Punjab Main Make

EN 24 FORGED FLATS

Width – 65 -650 mm

Thickness – 65 mm to 450 mm

Brand – Kolkatta& Punjab Main Make

Chemical Composition & Technical Specification EN 24

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

 EN31 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

Key features:

• Very high strength steel alloy
• Easy to heat treat and temper
• Supplied hardened & tempered
• Good combination of strength, ductility and wear resistance

Machinability
Readily machinable

Hardening
Supplied hardened and tempered.

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