He pai ake te pereti raima a Youloy i te pereti rino waro. Take? Astm a 387 Papaa te pepa maitai o te kowhatu 12 he nui ake te aro ki te whānuitanga o nga maimoatanga wera me nga mahi miihini. He mea hangaohia ana e te chromium, molybdenum, kolybdenum, te manganese, sicon, me te ake, he kaha ake, he kaha, he wera, he kauri.