steel with more than 0.3% carbon

The invention has simple process, adopts waste hard steel so as to save the cost, changes wastes into valuables and saves energy sources;

本发明的工艺简单，采用废旧的硬质钢材，节约成本，变废为宝，节约资源；

The divers also wear specialized dive suits and old-fashioned hard steel helmets so they can safely operate in contaminated water without being exposed to toxins.

潜水员们也经常穿着特制的潜水服和旧式的钢铁头盔，以使得他们在充满污染水体中不被侵害。

The study is concerned with perforation of thick woven composite plates by hard steel cylinder.

本文对厚编织复合材料板由硬的钢圆柱弹丸穿孔问题进行了研究。

In this case, no hard steel needle but soft tube is left in the human veins so the vein walls will not be punctured when people physically rotate or bend. The medical incidents are prevented.

这样，留在人的血管中的就没有硬的钢针，只有软管了，人的肢体转动或弯曲时，就不能刺破血管壁，避免了医疗事故的发生。

It is very difficult to write or draw with it, but when you have once mastered the use of it, you will, with it, write and draw with a beauty and grace which you cannot do with a hard steel pen.

它非常难于书写和作画，而一旦你掌握它的用法，你可以用它以一种硬钢笔无法做到的优美和雅致来书写和作画。

The primary purpose of annealing is to soften hard steel so that it may be machined or cold worked.

退火的主要目的是使坚硬的钢软化以便机加工或冷作。

A systematic experimental study has been conducted an mild Steel tubes of various thickness in their perforation by hard steel spheres.

本文通过实验研究了不同尺寸的硬质钢球弹丸对不同壁厚的低碳钢圆钢管的侵彻和穿孔效应；