求翻译：含B钢淬透性明显提高主要的弹簧钢类，用途很广，可制造各种中等截面是什么意思？

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With B steel hardened and increase the spring steel, use a wide variety of medium size, and can be used to produce cross-sectional <25 mm of spring, such as automobiles, tractors, spring 60, such as helical spring 55 Si Mn Si 2 2 55 MnB SiMnVBCr CrVA 50 faculty-hardened and tempered high-quality,