Steel
Alloy Selection |
ME
Elecmetal engineers considered two alternate Cr-Ni-Mo steel
alloys
AISI 8630 (0.27-0.33C,
0.60-0.95 Mn, 0.15-0.30 Si, 0.35-0.65Cr, 0.35-0.75 Ni, 0.15-0.25
Mo)
AISI 4320 (0.17-0.23C,
0.40-0.70 Mn, 0.15-0.30 Si, 0.35-0.65Cr, 1.55-2.00 Ni, 0.20-0.30
Mo) |
|
Tests
on these standard alloys showed that they did not meet the
mechanical property requirements. But
they were close enough, that the alloys could be modified with the addition of alloying elements to increase the strength and hardenability
to meet the property requirements in this large casting.
|
| Casting
and heat-treat tests and mechanical tests gave the following properties for the two modified steel
alloys. |
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|
|
Performance
Requirement |
Choose
AISI 8630 Modified |
Choose
AISI 4320 Modified |
| Minimum
Ultimate Tensile Strength |
130
ksi |
<130
ksi |
>130
ksi |
| Minimum
Yield Strength |
110
ksi |
<110
ksi |
>110
ksi |
| Acceptable
Hardness Range |
280-320
BHN |
240-320
BHN |
280-320
BHN |
| Water Quench |
Crack
Free |
Yes |
Yes |
|
Given
the mechanical property requirements for the track shoe,
Choose
the alloy that best meets the performance requirements.
|
|
|
Back
|
Choose an
alloy above |
11 |
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