The best replacement for 4140 is 4340.

The best alternatives to 4140 are rated as following:
★★★★★  4340
★★★★  4150
★★★★  4130
★★★  4150 steel
★★★  4142
★★★  1045
★★  1018
★★  4340 steel
★★  8620 steel
★★  41l40
★  a36
★  6150
★  a2 steel
  5160
  8620
  1040
  416
  4140h
  12l14
  s7
  p20
  4145
  416 stainless steel
  4130 steel

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4140
4340
4150