4130 Alloy Steel Chemical Composition
C
Mn
Si
S
Mo
P
Ni
Cr
0.28 to 0.33
0.40 to 0.60
0.15 to 0.35
.040 max
0.15 to 0.25
.035 Max
0.25 Max
0.80 to 1.10
Alloy Steel Surface & Physical Conditions
Physical Condition
Surface Condition
A
As Forged
1
Black As Forged or Hot Rolled
B
As Rolled
2
Pickled Or Blast Cleaned
C
Annealed
3
Smooth Turned/Rough Turned
D
Normalized
4
Cold Finished/Cold Drawn
E
Normalized & Tempered
5
Surface Ground/Centerless Ground
F
Heat Treated & Tempered
6
Turned, Ground & Polished (TGP)
4130 Steel Typical Mechanical Properties
Tempering Temperature
Tensile Strength
Yield Strength
Elongation %
Reduction in area %
Hardness
°C
°F
MPa
ksi
MPa
Ksi
HB
205
400
1627
236
1462
212
10
41
467
315
600
1496
217
1379
200
11
43
435
425
800
1282
186
1193
173
13
49
380
540
1000
1034
150
910
132
17
57
315
650
1200
814
118
703
102
22
64
245
Water quenched
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4130 Alloy Steel Properties