The best replacement for 4140 steel is 4150 cmv.

The best alternatives to 4140 steel are rated as following:
★★★★★  4150 cmv
★★★★★  4130
★★★★  4340
★★★★  4150 steel
★★★  416 stainless
★★★  4142
★★★  1045
★★★  1018 steel
★★★  4150
★  8620
★  1018
★  4130 steel
★  4340 steel
  4142 steel
  1020
  1040 steel

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4140 steel
4150 cmv
4130