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AMS 6484 (4340)AMS 6484 (4340)

Chromium Nickel Molybdenum Alloy Steel Bar

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.

Aerospace Sector

This grade is also available as a Premium Aircraft Quality product. The regular aircraft quality material is re-melted 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.

The density of this material is typically 7.85kg/dm³.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Download AMS 6484 (4340) Datasheet

Typical Applications:

Aircraft landing gear, engine components, crankshafts, axles. Intended for parts with sections 3 ½” or less in thickness at time of heat treatment, which require a through-hardening steel capable of developing minimum hardness of Rockwell “C” 30. Premium aircraft quality is intended for use in the manufacturing of highly stressed parts at higher strength levels, such as 260/280 ksi and where a much cleaner steel is desired.

We offer AMS 6484 (4340) in round bar. We can also process the material for you - with 30 bandsaws available throughout the Smiths Group, we have the capacity to cut your material to exact size which means we supply the product much closer to your finished requirements.

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