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我们处理过一批工件,如图1所示,材料为65Mn或60Si2MnA,原始组织为球状珠光体和均匀分布的细小颗粒状碳化物,厚度只有1.5毫米。要求在全长450毫米上的一侧10±2毫米宽度范围内硬度为HRC60±2;淬硬带组织为细回火马氏体和均匀分布的碳化物;热处理后,平面弯曲度≤1.0毫米,如凹入,则最大凹入处应≤10毫米;如凸出,则最大凸出处应≤1.5毫米。这种钢制长条薄板件的局部淬
We have handled a number of workpieces, as shown in Figure 1, made of 65Mn or 60Si2MnA. The original structure was spherical pearlite and uniformly distributed fine granular carbide with a thickness of only 1.5 mm. Requires a hardness of HRC 60 ± 2 over a width of 10 ± 2 mm on a side of 450 mm of full length; Tissue hardened with fine tempered martensite and uniformly distributed carbides; Plane curvature ≤ 1.0 mm after heat treatment , Such as concave, the maximum recess should be ≤ 10 mm; if convex, the maximum convex should be ≤ 1.5 mm. Local quenching of such long strips of steel