The best replacement for 1045 is 4140.

The best alternatives to 1045 are rated as following:
★★★★★  4140
★★★★  1040x
★★★★  1018
★★★  4140 steel
★★★  a36
★★  1095 steel
★★  1060
★★  1060 carbon steel
★  1060 steel
★  1144
★  4340
★  1018 steel
★  1040 steel
  1215
  440 steel
  1046
  4130
  form 1040x
  8620
  4150

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1045
4140
1040x