关于gcr15轴承钢质量缺陷的初步分析(同名58915)

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1、关于GCr15轴承钢质量缺陷的初步分析近期由攀钢钒供GCr15连铸坯生产的中小型轧材（∮40～55mm）集中出现了以表面纵向裂纹为特征的质量问题。经攀长特的初步分析，发现1方及3方铸坯均存在皮下裂纹等缺陷，一些炉次钛含量偏高，为此课题组对近期轴承钢的炼钢生产工艺状况进行了调查，现汇报如下。2铸坯皮下缺陷产生原因分析1.1缺陷现象攀长特从生产现场抽取5支（280×380mm炉号P12301500）采用四面打蛇形的办法在初轧厂进行坯料表面检查未发现表面问题。在连轧生产现场抽取2支150×150mm（经1#方坯280×380mm炉号P12301504

2、开坯）采用打蛇形的办法在坯的表面发现有2处0.8～1.2mm皮下裂纹（见下图1-1）。图1-1方坯中间坯表面裂纹缺陷形貌攀长特对P12604216炉号2支坯料打蛇形检查，在坯料的表面发现有2处深0.8～1.2mm的裂纹缺陷，有3处呈不规则多边形（见图1-2）、长条形（见图1-3）深约1.5mm的夹渣缺陷。114图1-2铸坯皮下不规则多边形夹渣形貌图1-3铸坯皮下长条形夹渣形貌1.2过程工艺控制情况1.2.1化学成分最近生产的GCr15轴承钢的化学成分见表1-1。化学成分控制处于要求的范围内，P、S及其它有害元素均得到了有较控制，因此化学成分的影

3、响可以排除。114表1-1成品熔炼成分/%炉号CSiMnPSCuCrNiMoNbVAlsTiSnSbAsP126017730.970.30.370.0160.0040.061.480.050.010.010.020.0060.0030.010.010.01P126031040.970.270.380.0200.0060.051.50.050.010.010.010.0140.0060.0050.0020.006P126031050.980.290.360.0180.0040.051.480.050.010.010.010.0250.0070.0

4、050.0020.005P126031060.950.270.370.0150.0040.051.470.060.010.010.010.0380.0050.0050.0020.006P126031070.990.280.370.0110.0040.051.470.060.010.010.010.0410.0040.0050.0020.006P126042150.970.280.370.0160.0060.051.460.060.010.010.010.0410.0040.0060.0020.004P126042160.980.270.370.

5、0130.0050.051.460.050.010.010.010.0050.0040.0070.0020.005P126042171.000.280.360.0110.0070.051.50.050.010.010.0120.0090.0050.0070.0020.005P127014850.980.240.340.0110.0040.051.490.050.010.010.0140.0220.0050.010.010.010P127014861.010.260.360.0130.0040.051.480.050.010.010.0150.0

6、140.0040.010.010.010P127014871.010.250.40.0100.0040.051.50.050.010.010.0130.0220.0090.010.010.010P127014881.000.260.320.0110.0070.051.510.050.010.010.0130.030.0080.010.010.010P127014890.980.260.340.0150.0050.051.470.050.010.010.020.010.0040.010.010.010P127014901.000.250.340.

7、0120.0050.051.490.050.010.010.010.010.0050.010.010.010P127018390.980.270.370.0140.0060.061.460.050.010.010.010.0050.0080.010.010.010P127018400.990.260.370.0140.0050.061.440.050.010.010.010.0050.0070.010.010.010P127018411.020.290.360.0130.0050.061.460.050.010.010.010.0090.008

8、0.010.010.010P127018421.020.280.360.0150.0060.061.50.050.010.010.020.0160.0