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All Categories > Alloyed Bars and Plates > Aircraft Alloy Steels > Cold Finished Aircraft Alloy Bars > E-4340 Aircraft Alloy > E-4340 Aircraft Normalized & Tempered Cold Finished Alloy - Squares  
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E-4340 Aircraft Normalized & Tempered Cold Finished Alloy - Squares


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This chromium nickel molybdenum alloy is a widely used deep-hardening constructional steel. It is used at a variety of strength levels and at each level possesses remarkable ductility and toughness. With its high alloy content uniform hardness is developed by heat treatment in relatively heavy sections. High fatigue strength makes E-4340 ideal for highly stressed parts. It maintains its strength and hardness at elevated temperatures.

This grade is available as electric furnace vacuum degassed steel to meet the high aircraft quality standards of AMS 2301. Thus, it is suitable for the fabrication of parts which may be subjected to magnetic particle inspection.

This grade is also available as a Premium Aircraft Quality product. The regular aircraft quality material is remelted in a vacuum using consumable electrode practice. This results in a much cleaner steel meeting the magnetic particle test requirements of AMS-2300 and insures a steel of the highest quality with excellent transverse ductility and toughness at high strength levels.

UNS G43406, MIL-S-5000 - AMS 2301

Color Marking: Ends painted Yellow

Physical Conditions E
Surface Condition 4

Stock Lengths: 12'

Maximum Brinell 265


Item #

Estimated Weight per Foot

Estimated Weight 12-Ft. Bar

5/8 1.329 lb 15.95 lb
3/4 1.914 lb 22.97 lb
1 3.403 lb 40.84 lb
1 1/4 5.318 lb 63.81 lb
1 1/2 7.657 lb 91.89 lb


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