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8620
Details
 

Alloy steel 8620
standard£º ASTM A29/A29M-04

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¡¡¡¡ Japan:SNCM220(SNCM21)
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¡¡¡¡ English:805M20
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¡¡¡¡ French:20NCD2


Chemical composition£º
¡¡ C £º0.18¡«0.23 ?   

     Si£º0.15¡«0.35

     Mn£º0.70¡«0.90 ?

??? ????      S £º¡Ü0.035
  ?   P £º¡Ü0.035
   ? Cr£º0.40¡«0.60
    ? Ni£º0.40¡«0.70
    ? Cu£º¡Ü0.030
    ? Mo£º0.15¡«0.25


 

mechanical properties£º
tensile strength ¦Òb (MPa)£º¡Ý980(100)
yield strength ¦Òs (MPa)£º¡Ý¡Ý785(80)
extensibility ¦Ä5 (£¥)£º¡Ý9
reduction of area ¦× (£¥)£º¡Ý40
notched bar impact strength ¦Ákv (J/cm2)£º¡Ý59(6)
rigidity £º¡Ü197HB