| Heat treatment
          of the connectors was a critical process step to produce the required
          microstructure, mechanical properties,  and Charpy Impact values. 
           The castings
          were heat treated per the ASTM A958 specification ( a 1700F
          austenitizing, water
          quench, and  an 1150F temper cycle).
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                |  Pacific Steel Heat Treat Furnace
 |  |