Nā pahi ʻōpala mahiʻai, pahi ʻōpala paʻakikī maikaʻi, pahi ʻōpala mahiʻai

ʻO ka pahi mahiʻai kahi mea hana metala i hana kūikawā ʻia no ka mahiʻai ʻana, hoʻohana nui ʻia i nā mahiʻai rotary. ʻO kāna hana nui ka wāwahi ʻana i ka lepo, wehe i nā nāhelehele, a mahiʻai i ka ʻāina. Ma muli o nā ʻokoʻa kūkulu, hiki ke hoʻokaʻawale ʻia ʻo ia ka pahi mahiʻai ʻano C a me ka pahi mahiʻai ʻano L. ʻO ka mea maʻamau he kila kūikawā 65Mn a i ʻole 60Si2Mn, me ka paʻakikī o HRC 42-48. Loaʻa iā ia ke kūpaʻa kiʻekiʻe i ka ʻaʻahu a me ke kūpaʻa i ka hopena.