Abstract: The 20 mm clad plate of surface-treated 10 mm plate of low alloy wear-resistant NM450D steel (/% : 0.22C, 0.70Cr, 1.50Mn, 0.30Si, 0.012Ti, 0.030Nb) and 10 mm plate of carbon steel Q235B (/% ： 0.19C, 0.25Mn, 0.04Si) is welded at four-comer of plate and double-rolled by a lab 180 mm two-high mill with reduction 60% at 1150℃ and with reduction 30% at 930°C to 5.6 mm clad plate, then quenched at 800~1000°C and tempered at 250 °C. Results show that the clad interface of 5.6 mm clad plate of low alloy wear-resistant steel-carbon steel quenched at 900°C + tempered at 250°C has nice contact, the structure of steel Q235 is lath martensite + ferrite and minor bainite and pearlite, the structure of steel NM450D is tempered martensite with HV hardness value 500, the shearing-strength of clad plate is 367 MPa, all meet the requirement of standard.

Key words: Wear-Resistant Steel NM450D-Carbon Steel Q235B Clad Plate, Clad Interface, Control-Rolling, Heat Treatment, Structure, Shearing Strength

摘要： 10 mm NM450D低合金耐磨钢板（/%:0.22C，0.70Cr，1.50Mn，0.30Si，0.012Ti，0.030Nb）和10 mm Q235B碳钢板（/%:0.19C，0.25Mn，0.04Si）经表面处理和四角焊接成20 mm复合板，在180 mm二辊实验轧机上经1150℃，60%压下率和930℃，30%压下率两次轧制成5.6 mm复合板,再经800~1000℃淬火，250℃回火处理。结果表明，经900℃淬火+250℃回火的低合金耐磨钢-碳钢复合板的5.6 mm复合界面接触良好，Q235B钢组织为板条马氏体+铁素体和少部贝氏体和珠光体，NM450D钢组织为回火马氏体,其HV值为500，复合钢板抗剪强度为367 MPa，均达到标准要求。

关键词: NM450D耐磨钢-Q235B碳钢复合板, 复合界面, 控制轧制, 热处理, 组织, 剪切强度