它由防锈的回火钢制成，具有缎光表面。
It is made of rustproof tempering steel with a satin-finish surface.
另外研究发现高温回火并不是引起零件表面脱碳的主要原因。
And the higher temperature tempering is not the main reason for the decarburization.
另外研究发现高温回火并不是引起零件表面脱碳的主要原因。
And the higher temperature tempering is not the main reason for the decarburization.
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