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07500 The Effect of Metallurgical Factors on HIC of High Strength Linepipe Steel

Picture for 07500 The Effect of Metallurgical Factors on HIC of High Strength Linepipe Steel
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Product Number: 51300-07500-SG
ISBN: 07500 2007 CP
Author: Wan Keun Kim, Kyoo Young Kim, Seong Ung Koh, and Boo Young Yang
Publication Date: 2007
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Hydrogen sulfide contained in crude oil and natural gas causes hydrogen related problems such as hydrogen induced cracking (HIC) and sulfide stress cracking (SSC) of pipeline steels. In particular, HIC is a more serious problem because it occurs without applied stress. To improve HIC resistance, addition of proper alloying elements, high cleanness and Ca treatment during steel making processes are required. However, the effects of metallurgical factors on HIC are not well understood to improve HIC resistance of pipeline steels. In this study, HIC resistance of two high strength steel plates was evaluated by using NACE TM0284- 02 methods. After the tests, HIC resistance was measured in terms of crack area ratio (CAR) using ultrasonic detector. Fracture behavior of HIC was investigated by observing fractured surfaces using optical microscopy (OM) and scanning electron microscopy (SEM). HIC property was discussed in terms of metallurgical parameters such as primary microstructure, second phases and inclusions. Results showed that cracks nucleated in the steels are affected not only by the presence of inclusions but also by the microstructure surrounding it. In this study, the effect of various metallurgical factors on nucleation and propagation of HIC was discussed in detail.
Hydrogen sulfide contained in crude oil and natural gas causes hydrogen related problems such as hydrogen induced cracking (HIC) and sulfide stress cracking (SSC) of pipeline steels. In particular, HIC is a more serious problem because it occurs without applied stress. To improve HIC resistance, addition of proper alloying elements, high cleanness and Ca treatment during steel making processes are required. However, the effects of metallurgical factors on HIC are not well understood to improve HIC resistance of pipeline steels. In this study, HIC resistance of two high strength steel plates was evaluated by using NACE TM0284- 02 methods. After the tests, HIC resistance was measured in terms of crack area ratio (CAR) using ultrasonic detector. Fracture behavior of HIC was investigated by observing fractured surfaces using optical microscopy (OM) and scanning electron microscopy (SEM). HIC property was discussed in terms of metallurgical parameters such as primary microstructure, second phases and inclusions. Results showed that cracks nucleated in the steels are affected not only by the presence of inclusions but also by the microstructure surrounding it. In this study, the effect of various metallurgical factors on nucleation and propagation of HIC was discussed in detail.
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