MUMBAI, India, June 24 -- Intellectual Property India has published a patent application (202617063215 A) filed by Baoshan Iron & Steel Co. , Ltd. on May 19, 2026, for X65 Pipeline Steel For Service In Supercritical Co2 Environment And Manufacturing Method Therefor.
Inventors include Zhang, Haozhen; Zhang, Chuanguo; Sun, Leilei; Mei, Feng; Gu, Ye; and Chen, Guofeng.
The application for the patent was published on June 12, 2026, under issue no. 24/2026.
Abstract: A X65 pipeline steel for service in a supercritical CO2 environment and a manufacturing method therefor. The pipeline steel comprises the following chemical components in percentage by weight: 0.020-0.070% of C, 0.10-0.30% of Si, 0.80-1.45% of Mn, less than or equal to 0.0080% of P, less than or equal to 0.0015% of S, 0.05-0.35% of Cu, 0.05-0.30% of Ni, 0.20-0.80% of Cr, 0-0.09% of Mo, 0.025-0.055% of Nb, 0-0.050% of V, 0.005-0.020% of Ti, 0.0010-0.0040% of Ca, 0.010- 0.040% of Alt, less than or equal to 0.0004% of B, less than or equal to 0.0030% of O, less than or equal to 0.0050% of N, less than or equal to 0.0002% of H, 0.0005- 0.0050% of Ce, and the remainder comprising Fe and unavoidable impurities. In addition, the following requirements are met: Ca/S = 1.5; Nb+V+Ti = 0.120%; 0.8 = (Nb+V+Ti)/(C+N+5×B) = 2.5; and (Cr+Cu/3+Ni/3+Mo+Ce×25)/(S+P) = 50. The obtained pipeline steel can reach X65 strength level, and has good weldability, excellent low-temperature toughness and corrosion resistance.
Disclaimer: Curated by HT Syndication.
