Ny varavarana afo tsy misy vy dia misy singa metaly nikela sy chromium, miaraka amin’ny fanoherana hafanana mahery. Ny varavarankelin’ny afo vy tsy misy vy dia mbola afaka mitazona tanjaka sy henjana ambony amin’ny hafanana avo, ary manana tanjaky ny vokatra avo lenta sy fanoherana amin’ny hafanana ambany 900 ℃.

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