ʻO ke kila kalapona he kila me ka ʻike kalapona a hiki i ka 2.1% ma ke kaumaha. Ka mānoanoa o ka pā kila ma lalo o 0.2-3mm, ka mānoanoa o ka pā kalapona wela 4mm a hiki i ka 115mm Q195(ST33),Q215A,Q215B,Q235A,Q235B(SS400),Q235C,Q235D,Q255A,Q255B,Q275(SS490)
ʻO S235jr kahi kila haʻahaʻa kalapona i hoʻohana ʻia no ka wili, bolting a me ka riveting. Hoʻohana nui ʻia ia no nā ʻāpana kūkulu o nā hale, nā alahaka, nā moku a me nā kaʻa, a no ka hana ʻana i nā mea hana like ʻole, nā ʻokiʻoki, nā mold a me nā ana.