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AMS 6257

AMS 6257 Specification 300M/4340M Low Alloy Steel

Steel Bars. Steel Forgings. Steel Tubing. 0.82 Cr, 1.8 Ni, 0.40 Mo, 0.40-0.44 C, 1.60 Si, 0.08 V.

300M/4340M Low Alloy Steel in AMS 6257 Specification, per SAE International:
“This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.”

Consumable electrode vacuum remelted, normalized and tempered. Applications: Aerospace (aircraft, spacecraft), motorsports. High tensile strength. High impact resistance.

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