ʻO kaʻikepili o ka carbon o 4140 he 0.15-0.25% kiʻekiʻe loa ma kānaʻano. Hiki i ke kumu ke wela i ka leʻaleʻa a me ka hana maʻamau i ka lewa, a iʻole ka nui a me ka quench a me ka huhū ma polymer a iʻole aila.
hoʻohui kilina kīpī p9
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