The best replacement for hb is 2b.

The best alternatives to hb are rated as following:
★★★★★  2b
★★★  hb
★★  2b pencil
★★  fb
★★  2b lead
★  hrc
★  h lead
★  b lead
★  hrb
★  b
★  2b darker
★  #2
★  b pencil
  hgb
  engerix b
  rb
  2h
  2b pencil lead
  #2 pencil

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Speaking about hb, one probably shouldn't forget about low mcv and mch.

Other search terms related to hb and their ratings are:
★★★★★ low mcv and mch
★★★★ low ferritin
★ low mcv
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Google Trends

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hb
2b
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