X70 grade pipeline steel plate with hydrogen embrittlement resistance and manufacturing method
By employing a low-C-Si-Mn and Nb-V-Ti composite microalloying process, the microstructure of the steel plate is controlled to be polygonal ferrite and acicular ferrite, thus solving the hydrogen embrittlement problem of pipeline steel under high-pressure hydrogen environment. This achieves high strength and high-efficiency resistance to hydrogen embrittlement, making it suitable for high-pressure hydrogen transportation pipelines.
CN117947341BActive Publication Date: 2026-06-02ANSTEEL BEIJING RES INST CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ANSTEEL BEIJING RES INST CO LTD
- Filing Date
- 2024-01-26
- Publication Date
- 2026-06-02
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Figure CN117947341B_ABST
Abstract
The present application relates to a kind of X70 grade pipeline steel plate with anti-hydrogen embrittlement performance and manufacturing method, the chemical composition in the pipeline steel plate is as follows by mass percentage: C 0.03%~0.04%, Si 0.10%~0.11%, Mn 0.50%~0.52%, P≤0.004%, S≤0.001%, Ni 0.20%~0.30%, Mo 0.10%~0.15%, Nb 0.04%~0.05%, V 0.02%~0.03%, Ti 0.01%~0.015%, the balance is Fe and inevitable impurity element.The advantages are: the yield strength of pipeline steel plate is ≥490MPa;Tensile strength is ≥580MPa;-20 ℃ impact energy is ≥200J;Hydrogen-induced cracking performance index CSR, CLR, CTR are all 0 in A solution environment.
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