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低碳钢; 软钢 (0.1~0.25C); 低碳钢 (①When mild steel or certain alloy steels are heated above 900°C, in contact with carbon, that element is absorbed at the surface of the steel. The depth of the carbon enrichment depends on the time and temperature of the treatment; this process is known as 'case-carburizing'. 当软钢或某些合金钢加热到 900°C 以上并与碳接触时，碳元素即被吸收到钢的表层。这一富碳层厚度取决于处理的时间和温度；这一工艺过程称之为"表面渗碳"。② A mild steel carburized at about 925 °C for eight hours has a depth of outside 'case' of about a millimeter, and a carbon content of 0.9 per cent at and near the surface. 软钢在 925°C 左右渗碳 8h, 其外表渗碳层厚度约为1 mm, 表面及其附近含碳量为 0.9%。) |
