Kasashe daban-daban a duniya suna da sunaye daban-daban na bakin karfe. Kasuwa sau da yawa tana tuntuɓar Sin da Amurka, wanda ake kira ma'aunin ƙasa da ƙa'idar Amurka.
Jerin 200, jerin 300, da jerin 400 da aka ambata a sama sune ka'idodin Amurka. Saboda ƙa'idodin Amurka suna da sauƙin fahimta, yawanci ana kiran su Duk Ka'idodin Amurka ne.
Matsayin Ƙasa =========== Amurka Standard
1cr17mn6ni5n========201
1cr18mn8ni5n========202
0cr18ni9==============304
00cr19ni10==========304L
0cr18ni12mo2t=======316Ti
00cr17ni14mo2=======316L
0cr17ni12mo2========316
1cr18ni9ti==========321
0cr18ni10ti=========321
0cr23ni13=============309S
1cr20ni14=============309S
0cr25ni20=============310S
1cr25ni20============= 310s
0cr13=============405
1cr13===============410
2cr13===============420
3cr13==============420
4cr3================ 430
Lokacin aikawa: Janairu-19-2020