Steel Bars. 0.95 Cr, 0.20 Mo.
4130 Alloy Steel in AMS6348 Specification per SAE International:
“This specification covers an aircraft-quality, low-alloy steel in the form of bars.
These bars have been used typically for parts, 0.50 inch (12.7 mm) and under in section thickness at time of heat treatment, requiring a through-hardening steel capable of developing hardness as high as 35 HRC when properly hardened and tempered and also parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such applications.”
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