If the set collar endhardness is lower than HRC40, should first on the end surface again a built-up welding hard alloy, after the polish repackaging.
如果固定环端面硬度低于HRC40，则应先在端面上重新堆焊一层硬质合金，经磨光后再装配。
2
The grain hardness of wheat, reflecting character of endosperm texture, is one of the most important determinants of milling, baking and end-use quality.
小麦籽粒硬度是胚乳质地的反映，它是国际通用小麦分类指标之一，与磨粉品质、食品加工品质关系密切。
3
The effects of different silane end-capped ratios and HTPB content on mechanical properties, hardness and surface dry time of the sealant were discussed.