GB/T 223.86 - 2009 stipulates the use of infrared absorption method after combustion in induction furnaces to measure the total carbon content of steel and alloys. It clarifies the determination principle and puts forward requirements for the performance and accuracy of induction furnaces, infrared absorption meters and other equipment. Detail the details of sample collection, processing and weighing, and standardize the operation procedures of temperature control and Gas flow rate adjustment during combustion. Through this standard, the carbon content in steel and alloys can be accurately determined, providing a unified method for steel production, mass testing and other links, helping to control product mass and meet the needs of different industries for steel material performance.