En24

EN24 Material specs

1. EN24 - 817M40 Black (As rolled, forged or heat treated)
(ALLOY STEEL) (Direct hardening or nitriding) (NickelChromium/Moly)
Equivalents:
BS970 Part 1 1983, 817M40
BS970 of 1955 EN24
German W. Stoff No. 1.6582 | American AISI 4340
Chemical:
Composition %
Carbon
Silicon
Manganese
Nickel
Chromium
Molybdenum
= 0,36 - 0,44
= 0,10 - 0,35
= 0,45 - 0,70
= 1,30 - 1,70
= 1,00 - 1,40
= 0,20 - 0,35
Characteristics:
• A 6% allowance should always be made for removal of surface defects during
machining
• Machinability good (tends to self harden)
• Ideal for 60 ton tensile applications up to 250mm max.
• This material is often ordered in the annealed, as rolled or as forged condition for
machining. Subsequent heat treatment is used to achieve higher tensility. i.e.
condition T, U, V, W, X, Y and Z
Typical Applications:
Auto Main Shafts/Heavy Duty Shafts (mining industry)
Heavy Axles, Bolts
High Duty Connecting Rods
High Tensile Bolts and Studs
Differential Shafts, Pinion Sleeves
Mandrels for Tube Mills
Power Transmission Slide Gears and Slide Cams
Heat
Treatment
Condition
Tons/SQ. inch
Tensile
Strength
RM MPA
Yield Stress
RE MPA
A min on
5,65 So
Hardness
HB
Impact
IZOD
FT.Lb
KCV
Joules
Limited
Ruling
Section
mm
T
U
V
W
X
Y
Z
55/65
55/65
60/70
65/75
70/80
75/85
80/90
100
850/1000
850/1000
925/1075
1000/1150
1075/1225
1150/1300
1225/1375
1550
650
680
755
850
940
1020
1095
1235
13
13
12
12
11
10
10
5
30
40
35
35
30
25
18
8
248/302
248/302
269/331
293/352
311/375
341/401
363/429
444
250
150
100
63
29
29
29
29
35
50
42
42
35
28
21
9
Mechanical Properties
Gun Barrels
Hydraulic Rams/Pistons
RP 0,2
MPA
635
665
740
835
925
1005
1080
1125
Sulphur
Phosphorus
= 0,035 max
= 0,040 max
Rolled
Heat
Treated
Tel: [phone]. Fax: [phone]. e-mail: [email protected]
EN24 - 817M40
Product Information: