Core Viewpoint - The article emphasizes the significant advancements and developments in hydrogen pipeline transportation in China, highlighting the establishment of standards, project progress, and innovations in materials and technology for hydrogen pipelines. Group 1: Industry Standards and Policies - In 2025, multiple industry standards for hydrogen pipelines were released, including the "Hydrogen Pipeline Design Specification" and the "Pressure Pipeline Code for Hydrogen Pipelines," which address various aspects of pipeline construction and safety [2][4]. - The National Energy Administration has outlined a strategic direction for hydrogen pipeline development, focusing on projects like "West-to-East Hydrogen Transmission" and prioritizing local utilization [4]. Group 2: Project Progress - 2025 is marked as the "first year" for large-scale hydrogen pipeline construction in China, with over 7000 km of planned hydrogen pipelines, including six projects exceeding 100 km of pure hydrogen pipelines [3]. - As of December 2025, more than 1500 km of hydrogen pipeline projects have been completed or are under construction [3]. Group 3: Key Projects and Specifications - Notable projects include the Inner Mongolia green hydrogen transmission network (4400 km), the Ulanqab to Beijing-Tianjin-Hebei hydrogen pipeline (1145 km), and the Kanbao to Caofeidian hydrogen pipeline (1037 km), with various stages of construction and capacity [5]. - The projects have varying specifications, such as diameters ranging from 1 mm to 813 mm and pressures from 1 MPa to 7.2 MPa, with annual transport capacities reaching up to 155,000 tons [5]. Group 4: Innovations in Materials - In 2025, breakthroughs in pipeline materials were achieved, including the development of hydrogen transport steel pipes with enhanced resistance to hydrogen embrittlement, ensuring long-term stability in high-pressure hydrogen environments [6][7]. - New products like hot-rolled pipeline steel and seamless pipes for hydrogen transport were launched, contributing to the establishment of a "Hydrogen Tough Steel Joint Laboratory" [7].