With the advancement and development of the iron and steel industry, the requirements for product quality are high and analytical methods are increasingly important. Several methods commonly used for the detection of steel carbon and sulfur are simple methods such as titration, volumetric method and gravimetric method. These methods are traditional methods for detection and analysis. Infrared absorption method is now a common method for rapid detection and analysis of steel enterprises' laboratories. Infrared precision absorption method to detect carbon and sulfur in the steel two elements, high-frequency infrared carbon sulfur analyzer using high-frequency induction furnace combustion infrared absorption method, a wide range of detection (metallic materials and non-metallic materials), the accuracy of this method is high.

1. Infrared absorption method (infrared carbon-sulfur analyzer): The carbon and sulfur in the sample are heated at high temperatures under oxygen-rich conditions and oxidized to carbon dioxide and sulfur dioxide gas. After the gas is processed into the corresponding absorption tank, the corresponding infrared radiation is absorbed and transmitted by the detector as a signal, and the output is processed by a computer. This method has the characteristics of accuracy, rapidity, and high sensitivity. Both high and low carbon and sulfur content are used. The infrared carbon and sulfur analyzer with this method has a high degree of automation and high cost performance, and is suitable for enterprises with high analytical accuracy requirements.

2. Volumetric method (gas-capacity carbon-sulfur instrument): The commonly used carbon measurement method is the gas volumetric method, and the sulfur measurement is the iodometric method and the acid-base titration method. In particular, the gas volumetric method for the determination of carbon and iodine is a fast and accurate method. It is the most commonly used method for the combined determination of carbon and sulphur. The accuracy of the carbon-sulfur analyzer using this method has a lower limit of carbon content of 0.050% and a lower sulphur content. 0.005%, to meet the needs of most occasions.

3, titration method (titrator): non-aqueous titration system uses acid-base titration method for the determination of steel carbon and sulfur elements. Matched with arc burners, it is suitable for use in general labs and furnaces.

4. Gravimetric method (carbon-sulfur combined analyzer): Alkaline asbestos is used to absorb carbon dioxide, and carbon content is calculated by “incremental”. Determination of sulfur commonly used wet method, the sample with acid decomposition oxidation, converted to sulfate, and then in the hydrochloric acid medium was added cesium chloride, barium sulfate generated by precipitation, filtration, washing, burning, weighing the final calculation of sulfur The content. The disadvantage of the gravimetric method is its slow analysis speed, so it cannot be used for analysis of carbon and sulfur at the enterprise site. The advantage is that it has a high degree of accuracy. It is still recommended as a standard method at home and abroad and is applicable to standard laboratories and research institutes.

Nanjing Kirin Scientific Instrument Group Co., Ltd.

Testing Center

April 28, 2017

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