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普通低合金结构钢可分为强度用钢和特殊用钢两大类。强度用钢的特点是强度高,塑性和韧性好,而且有良好的焊接性能。强度用钢按屈服点的大小,分为300、350、400、450、500、550～600MPa六个级别。如常用的16Mn钢属于350MPa级,
Ordinary low-alloy structural steel can be divided into two kinds of strength steel and special steel. Strength steel is characterized by high strength, good ductility and toughness, and good weldability. Strength steel yield point by the size, divided into 300,350,400,450,500,550 ~ 600MPa six levels. Such as the commonly used 16Mn steel is 350MPa level,