Session: HT-03-01 Materials & Fitness for Service Methods for High-Pressure Vessels and Piping

Paper Number: 105862

105862 - A Study on Tensile Properties in Pipeline Materials (Api 5l X52) Under a High-Pressure Hydrogen Environment 

 This study confirmed the hydrogen embrittlement characteristics of API 5L X52 grade, a natural gas pipeline material, and confirmed whether it is a suitable material for hydrogen gas use. In order to confirm the in-situ hydrogen embrittlement characteristics under a high-pressure hydrogen gas atmosphere, a slow strain rate test was conducted under a high-pressure hydrogen gas and nitrogen gas atmosphere. The thickness of the material used for evaluation was 15.9 mm and a pipeline welded to 20 inches through submerged arc welding was used. The evaluation was performed by processing the specimen in the transverse direction on the pipeline according to the ASTM G 142 - 98 code and processing it into a notch specimen. The specimens of this evaluation were the base metal and the welded metal which were subjected submerged arc welding process. The extension rate of the test was 0.02 mm/s ± 10% after the temperature was stabilized at room temperature and pressure of 8 MPa for 10 minutes according to ASTM G142 - 98 code. As a result of the evaluation, it was found that the tensile strength and elongation decreased due to hydrogen penetration through cracks when the material was deformed in a high - pressure hydrogen gas atmosphere.

Presenting Author: Won Jung Kim Hyundai steel

Presenting Author Biography: * 2018.06 ~ : Hyundai Steel - Research Engineer

Authors:

Won Jung Kim Hyundai steel
Hyung Goun Joo Hyundai Steel
Sung Kyu Cho Hyundai Steel
Chnagnam You Hyundai steel
Hyeong Sub Kim Hyundai steel
Min Su Kim Hyundai steel