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AISI Steel

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Dear Sirs

 

Not a structural question, but may be I can get some help.

 

What is the difference between

 

            AISI 4140

 

 

and      

AISI 4140 H           

 

What is H-Steel?

 

Thanks in advance

 

Atenciosamente/Best regards/Freundlichen Grüβen/Saludos cordiales

Mário Velez Nauer
DEMAG CRANES & COMPONENTS LTDA
ÉTelefone: 00 55 11  2145-7886
ÊTelefax: (11)   4616-1371
Cotia-SP-Brasil
?e-mail: mario.velez(--nospam--at)demagcranes.com.br
þsite: www.demagcranes.com.br