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ASTM HS 556

Chemical composition(mass fraction)(wt.%)

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.05  0.15
Si 0.20  0.80
Mn 0.50  2.00
Ni 19.00  22.50
Cr 21.00  23.00
Al 0.10  0.50
Cu  
Ti  
Fe   remaining
Mo 2.50  4.00
Co 16.00  21.00
W 2.00  3.50