Steel Bars. Steel Blocks. Steel Rings. Steel Sheets. Steel Forgings. Steel Tubing. 0.80 Cr, 1.8 Ni, 0.25 Mo, 0.38-0.43 C.
4340 High Tensile Steel in AMS 6415 Specification, per SAE International:
“This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.”
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