在长期的生产中，低合金耐热螺栓钢硬度超差是造成该材料热处理返修的主要原因之一。
In the long term of production of the low alloy heat-resistant bolting steel, the out-of-tolerance of hardness is the one of the primary causes that leads to the rework of heat treatment.
超细氧化铝因其具有高熔点和高硬度、良好的耐磨、耐蚀、耐热及绝缘等性能被广泛用于制作结构和功能材料。
The super-fine aluminum hydroxide is an important green flame retardant inorganic material with multi-function of retarding, suppressing smoke and filling.
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