Abstract
In this paper, Gleeble 3800 was used to simulate the changes in microstructure and properties of X70 ultra-abyssal pipeline steel at room temperature under different welding line energies. The industrial welding test of X70 pipeline steel was also conducted by adopting the 4-wire Longitudinal Submerged Arc Welded process. By optimizing welding process parameters, a reasonable welding specification process was developed. The results show that at different welding line energies, when the cooling time t8/5 is 12 ~50s, the microstructure of the welding coarse crystal zone is mainly lambellar bainite and granular bainite, and the uniform distribution of granular bainite exists in the austenite, obtaining better impact toughness. Ultra-abyssal longitudinal submerged arc welding steel producing by the optimized 4 - wire energy welding process has excellent mechanical properties and crack propagation resistance.
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