Regarding the carbon and sulfur analyzer, it is simply to determine the content of carbon and nitrogen in the sample. Chuangxiang Company started with a carbon and sulfur analyzer, and
started with a multi-element analyzer. After the single product is done well, it gradually extends to other types of analytical instruments. The importance of the carbon and sulfur analyzer has not decayed, from the split type of the previous computer and instrument separation to the newly developed integrated type.
The latest integrated CS-910 high-frequency infrared carbon and sulfur analyzer
What is the analysis principle of the carbon sulfur analyzer? As we all know, both carbon and sulfur are non-metallic elements, and can form corresponding carbides or sulfides in metals or alloys. Under the condition of high temperature and oxygen enrichment, it can be oxidized into CO2 and SO2.
Both CO2 and SO2 are polar molecules with permanent electric dipole moments, and therefore have structures such as vibration and rotation. They are divided into split energy levels according to quantum mechanics, and coupled with incident characteristic wavelength infrared radiation to produce absorption. Measuring the intensity of the absorbed thick infrared light can calculate the concentration of the corresponding gas, which is the theoretical basis for infrared gas analysis. The infrared carbon and sulfur analyzer uses the characteristics of CO2 and SO2 at 4.26μm and 7.4μm, respectively, with strong characteristic absorption bands. By measuring the gas absorption light intensity, the content of CO2 and SO2 is analyzed to indirectly determine the content of the measured sample. The percentage of carbon and sulfur.
Carbon exists mainly in two forms in steel:
One is compound carbon, that is, carbon exists in a compound form, mainly in the form of carbides of iron and carbides of alloying elements. For example, Fe3C, Mn3C, Cr3C2, WC, W2C, VC, TiC, etc.
The other is free carbon, such as carbon in iron-carbon solid solution, amorphous carbon, graphite carbon, annealed carbon, etc., collectively called free carbon.
In steel, it is generally dominated by compound carbon, and free carbon exists only in iron and annealed high-carbon steel. The combined carbon and free carbon are called total carbon. Infrared carbon sulfur analyzer is to determine the total carbon in the sample.
Carbon is an important element in steel. When the carbon content increases, its strength and hardness increase, while the plasticity and ductility decrease, making the steel brittle and difficult to process. On the contrary, as the carbon content decreases, the steel's Toughness is enhanced and easy to chip processing. Sulfur is a harmful element in steel. It exists in steel in the form of sulfides, mainly MnS. If the manganese content is very low, excess sulfur and iron synthesize FeS. Both FeS and MnS are the causes of cracks during thermal deformation. This poor performance is called thermal embrittlement. In addition, the presence of sulfur in the steel can also reduce the mechanical properties of the steel (mainly fatigue limit, plasticity and wear resistance). The presence of sulfur is also detrimental to the corrosion resistance and weldability of steel. Therefore, the lower the sulfur content in steel, the better. Generally, the content of sulfur in steel is at least an order of magnitude less than carbon.
The current carbon and sulfur analyzer product of Chuangxiang Analytical Instrument Co., Ltd. is a high-frequency infrared carbon-sulfur analyzer, which uses a high-frequency furnace to program the temperature, and has the technical characteristics of automatic constant temperature heating furnace head, automatic cleaning, automatic backflushing and reverse ash discharge.