ʻO ke kila 40Cr kekahi o nā kila i hoʻohana nui ʻia i ka ʻoihana hana mīkini.Ma hope o ke kinai ʻana a me ka hoʻoulu ʻana, loaʻa iā ia nā waiwai mechanical piha maikaʻi, maikaʻi haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa hopena a me ka haʻahaʻa notch sensitivity.He maikaʻi ka paʻakikī o ke kila, a hiki ke hoʻopau ʻia i ka mea kiʻekiʻe loa ke hoʻopau ʻia ka wai Ф 28 ~ 60mm, ʻaila kinai ʻia i Ф 15～40mm。 Ke 174 ~ 229hb ka paʻakikī, ʻo ka machinability pili he 60%.He kūpono ke kila no ka hana ʻana i ka mold plastic medium.
