Abstract
Cord steel has very strict requirements on the content of impurities. Hydrogen is a harmful gas element in steel and is the cause of hydrogen embrittlement. In this work, the Carrier gas hot extraction method is used to measure the hydrogen content of 77A steel. It was found that the measured value of hydrogen content was related to cooling capability of the mold. It is found that with the increasing of cooling speed of the mold, the hydrogen content increases. The measured hydrogen content can roughly reflect the hydrogen content in the liquid alloy by using the cast iron mold with faster cooling speed.
Highlights
Steel cord can be used for rubber product skeleton, high-strength wire, steel bar for reinforced concrete structure, railway switch, bridge component, etc. [1,2]
Diffuse hydrogen was determined by carrier gas thermal extraction method
Due to the large difference in thermal conductivity between nitrogen and hydrogen, there is an obvious difference in heat conductivity, which affects the resistance value of the heat sensitive element
Summary
Steel cord can be used for rubber product skeleton, high-strength wire, steel bar for reinforced concrete structure, railway switch, bridge component, etc. [1,2]. Due to the high temperature of molten steel, on-line measurement of hydrogen is very difficult. Carrier gas hot extraction will be used for obtaining hydrogen content data in 77A steel. Diffuse hydrogen was determined by carrier gas thermal extraction method. As the heating process progresses, the hydrogen in the sample is released and enters the thermal conductivity detector along with the carrier gas flow. Due to the large difference in thermal conductivity between nitrogen and hydrogen, there is an obvious difference in heat conductivity, which affects the resistance value of the heat sensitive element. Because the heat sensitive element is connected to the Wheatstone bridge, the difference in thermal conductivity between the two gases will directly affect the output of the voltage signal. The total voltage value can be obtained by integrating the voltage signal-time curve, and the hydrogen content of the sample can be calculated
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