4340 Hot Rolled Steel Bar Eaton Steel Bar Company4340 HR Alloy Bar. HR 4340 steel bar is a nickelchromiummolybdenum medium carbon alloy steel that is known for its toughness. This steel grade also has excellent ductility and strength compared to other alloy steels. 4340 HR bar has a good impact, wear, and abrasion resistance properties in a hardened condition.
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