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太原市恒力緊固件制造有限公司始建於1990年，是山西省緊固件行業的龍頭企業，占地面積6000平方米，廠房面積4000平方米，擁
有各類自動化生産及檢測設備100余臺套，18禁真人无遮拦视频,无遮挡拍拍拍免费观看采
用進口及國內大型標 ...
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The operating temperature is below 370℃, medium carbon steel after tempering is generally selected; More than 370℃, choose heat resistant steel; Below 480℃, low chromium molybdenum alloy pearlite heat resistant steel; Below 540℃, choose low alloy perlite heat resistant steel; Below 570℃, the use of high chromium martensitic heat resistant steel, but the linear expansion coefficient of this steel is small, when the cold preload can not be too large, in order to prevent the working temperature, the fastener overload and yield.
