北京韩建河山管业股份有限公司关于变更公司网址及电子邮箱的公告

Group 1 - The company has undergone a comprehensive upgrade and redesign of its official website, resulting in a change of the website domain [1] - The company's email address has also been adjusted in conjunction with the website changes [1] - The investor hotline remains unchanged, and the new website and email will be officially in use from the date of this announcement, while the old ones will be deactivated [1][2] Group 2 - The company expresses appreciation for the understanding of investors regarding any inconvenience caused by these changes [1] - The announcement is made by the board of directors of Beijing Hanjian Heshan Pipeline Co., Ltd. on August 7, 2025 [2]