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A Design Study in Steel - Cast Connex Steel Construction Connector

A27 Grade 70-40 Steel Alloy

The A27  Grade 70-40 is the strongest grade of A27, but it  does not meet the mechanical property requirements for the steel connector.

  • The ultimate tensile strength of 70 ksi is below the 80 ksi design goal.

  • The tensile yield strength of 40 ksi is below the 50 ksi design goal.

  • The elongation  meets the 22%  requirement, but the reduction in area  value fails to meet the 35% target.

In addition, the chemistry and heat treat specifications are not tight enough to permit precise control of the alloy for this demanding application.

The A27 alloy does not meet the mechanical property requirements for the steel connector. 
The A27 is not  the best choice.
Go Back for Another Alloy!


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Copyright 2009  by the Steel Founders' Society of America   All rights reserved. 
Address comments to: blairr@sfsa.org
Last Modified:October, 2009 by STG

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In cooperation with Cast Connex and Pacific Steel Castings