- SAE A 691 Grade 2 1/4 CR
- SAE A 666 S21460
- SAE A 580 S21400
- SAE A 540 Grade B21 Class 4
- SAE A 240 S21400
- SAE A 214
- UNS 21-4N + Nb + W
- UNS 21-4N
- AMS SA-299 Grade B
- AMS SA-299 Grade A
- AMS SA-29 Grade 94B30
- AMS SA-29 Grade 94B17
- AMS SA-29 Grade 92L60
- AMS SA-29 Grade 92L59
- AMS SA-29 Grade 92L55
- AMS SA-29 Grade 92L54
- AMS SA-29 Grade 9260
- AMS SA-29 Grade 9259
- AMS SA-29 Grade 9255
- AMS SA-29 Grade 9254
- AISI S64299
- AISI M29954
- AISI M29953
- AISI M29952
- AISI M29951
- AISI K64299
- AISI J92999
- SAE B 92 9998A
- SAE B 92 9995A
- SAE B 92 9990A
- SAE B 92 9980B
- SAE B 92 9980A
- SAE B 562 Grade 99.995
- SAE B 562 Grade 99.99
- SAE B 562 Grade 99.95