Abstract: The basic alloying elements in super-bainitic steels are C-Mn-Si and the structure of ultra-fine bainite, martensite and residual austenite is obtained by low temperature phase transformation at 300 〜500 ℃. In order to decrease critical cooling velocity, promote bainite transformation, partial super-bainitic steels are added Cr,Ni,Mo etc. alloy elements with decreasing C, Mn content to improve weldability of steel products. The super-bainitic steel has ultra-high strength and better plasticity, and its yield and tensile strength are respectively 〜1 200 MPa and 1 600 ~ 1 700 MPa with elongation ~ 15%. The yield strength of new generation super-bainitic steel is more than 1 300 MPa, and its tensile strength is more than 1 700 MPa.

摘要： 超级贝氏体钢的基本合金元素为C-Mn-Si,通过300～500℃低温相变得到超细贝氏体、马氏体和残余奥氏体组织。为减小临界冷却速度、促进贝氏体转变,部分超级贝氏体钢中添加Cr、Ni、Mo等合金元素,并降低C、Mn含量以改善钢材的焊接性能。超级贝氏体钢具有超高强度和良好的塑性,其屈服和抗拉强度分别达～1 200MPa和1 600～1 700 MPa,总伸长率为～15%。新一代超级贝氏体钢的屈服强度可达1 300 MPa以上,抗拉强度超过1 700 MPa。