Residual Stress Measurement in Steels Using a Chemical Etchant
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Table I. Compositions and Characteristics of Steels
Nominal Composztion, Wt Pct Alloy-Remamder Iron, Heat Treatment
Hardness RC
Approx. Yield Stress, ksi
4340-A6, Army Materials and Mechamcs Research Center
43
178
0.37 C-0.72 Mn-O 24 $1-1.81 Ni-0.78 Cr-0.26 Mo-0.000 P 0.006 S Double normalize 1650~F - 1 h; austenitize 1550~ - 1 h; oil quench 75~F; austemtize 1550~ h, salt quench 650~ ~ mm.; ozl quench 75~ - 15 mm.; temper 920~ 1 h; water quench 75~
D6-AC, Allegheny-Ludlum
49
240
0.47 C-0.75 Mn-0.22 S1 0.55 Ni-0.105 Cr-0.10 Mo
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