| COMPARISONS |
4140 |
HI
STRESS |
ADVANTAGES |
| Typical
manufacturing process |
Open
hearth furnace, large heats |
Electric
furnace, small heats |
Uniform
chemistry, high quality control |
Tensile
Strength
|
125000
PSI |
Minimum
155000 PSI at C-32 |
Higher
PSI and minimum assured |
| Yield
Point |
100000
PSI |
Minimum
135000 PSI at C-32 |
Higher
PSI and minimum assured |
| Degassed |
Minimal
sulphur or none at all |
RH-type
degassing to achieve reductions in sulphur, hydrogen, oxygen and
nitrogen |
A
clean, fine grain bar of uniform quality |
| Machined
Straightened |
Optional |
Always
machine straightened at mill |
Consistent
and uniform straightness |
| Machining |
Hard
and Soft spots |
Fine
grain uniform hardness |
Easier
and more economical machining |
| Fatigue
and Wear Resistance |
Inconsistent
hardness and toughness |
Uniform
hardness and high toughness |
More
economical due to longer service life |
| Stress
relieved |
Optional |
Stress
relieved at mill |
Increased
wear life |