The hardness and depth of chill layer on the roller outer surface can be raised with adding trace Bi into liquid Fe in centrifugal casting.
离心铸造时在铁水中加入微量的铋，可以提高滚筒外壳冷硬层的硬度和深度。
Effects of different tempering processes on surface microstructure of indefinite chill cast-iron roller were studied.
研究了回火工艺对无限冷硬轧辊表层基体组织的影响。
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