Some alloying elements ( such as chromium and tungsten ) make the grain of steel finer , thus increasing the hardness and strength of steel .

有些合金元素（如铬和钨）能细化钢的晶粒，从而增加钢的硬度和强度。

T he cast carbon steel , which is with carbon as the main alloying element and little other element , is of high strength , plasticity , tenacity and low cost .

含碳铸钢，是碳作为合金的主要成分及一些其他小成分，是一种高强度，高可塑性，高延展性和低成本的材料。