The best replacement for a106 is a53.

The best alternatives to a106 are rated as following:
★★★★★  a53
★★★★  a333
★★★  a106b
★★★  sa106
★★★  a105
★★★  api 5l
★★  a234
★★  astm a53
★★  a53 pipe
★  a519
★  a516
  sa 106
  a333 pipe

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a106
a53
a333