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A Design Study in Steel - ME Elecmetal Crawler Track Shoe

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.   

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

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Copyright 2006  by the Steel Founders' Society of America   All rights reserved. 
Address comments to: blairr@sfsa.org
Last Modified:July, 2006 by STG

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In cooperation with ME Elecmetal