AMS-S-5000 Specification 4340 High Tensile Steel (MilSpec here)
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 AMSS5000 Specification, per SAE International:
“This specification covers electric furnace steel bars and reforging stock of aircraft quality.”
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