Development of control sample of grade-B cast steel for spectral analysis
B级铸钢光谱分析用控制样品的研制

The composition design of control sample was carried out based on the product standard of grade-B cast steel.The standard samples containing carbon,sulfur,silicon,manganese,phosphorus,copper and nickel were developed by proper melting and casting technologies.The metallographic characterization indicated that the prepared standard sample exhibited uniform and dense structure without defects such as inclusion,air hole and crack.The uniformity test was conducted by single-factor variance analysis method.The uniformity was good and could meet the requirements of standard sample for spectral analysis.The certified values of control sample were obtained by several accurate and reliable analysis methods.Moreover,the analytical results were treated by mathematical statistics to obtain the accurate value and uncertainty of testing elements.This control sample could be applied to the ladle analysis and correction analysis of product quality control of grade-B cast steel.