克罗达五金紧固件专业制造商 芯部硬度(Core Hardness): 芯部硬度(Core Hardness):渗 碳后螺丝的心部硬度，一般在 28~38HRC之间，钻尾螺丝为 32~40HRC 克罗达五金紧固件专业制造商 心部...
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Core of large roller cold upsetting die made of ld steel has more ideal hardness, strength, anti wear capacity and impact toughness.
采用LD钢制造大型滚子冷镦模具的模芯，具有较理想的硬度、强度、耐磨性和冲击韧性。
The article introduces the method of superhardening treating hard alloy drawing die core with thermochemistry copermeation method so as to improve its surface hardness.
介绍采用热化学共渗法对硬质合金拉丝模芯进行超硬化处理，以提高其表面硬度的方法。
To study improving the factor's Level of Kushen Pian core tablets's hardness by mathematically statistical method . This method help us select the best productive process.
本文采用数理统计学的方法，研究了提高苦参片基片硬度的各种因素，找到了最佳工艺路线。
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