afs.gif (3195 bytes)

 amc.gif (6172 bytes) sfsa_s.gif (4934 bytes)
A Design Study in Steel Castings -- Pintle Socket

Steel Alloy Selection
The customer originally requested an A27 70-36 steel alloy.
  • A27 (70-36) has a maximum of 0.35% carbon and 0.70% manganese with an ultimate tensile strength of 70 ksi and a yield strength of 36 ksi.

Atchison Engineers suggested an A27 70-40 steel alloy with a higher yield strength.

  • A27 (70-40) has a maximum of 0.25% carbon and 1.20% manganese with an ultimate tensile strength of 70 ksi and a yield strength of 40 ksi.
  

wpe24.jpg (14309 bytes)
Comparison of A 27 70-36 and 70-40

  • The A27 70-40 was suggested as an alternative to A27 70-36, primarily for economic reasons. A batch melt of A27 70-40 was scheduled already for another job. Pouring off of a concurrent melt would save money.
                  ==>The A27 70-36 alloy would have required a separate melt with associated costs.

  • The result was a component with higher yield strength and 15% lower material cost.


Back


Next

6

 

Return to SFSA
Home Page

 sfsalogo.gif (1214 bytes) Copyright 2001  by the
Steel Founders' Society of America
All rights reserved. 
Address comments to: blairr@sfsa.org
Last Modified:September, 2001 by STG		 arrow_top.gif (1191 bytes)
Page 1

In Cooperation with
Atchison Casting

 wpe13.jpg (3115 bytes)