Study on Production Process, Microstructure, Properties of 15MnNbR Pressure Vessel Steel

Lu Lu Feng; Wei Wen Qiao; Zeng Qiang Song; Zhi Mei Cao; Yan Jun Yang; Song Liu

doi:10.4028/www.scientific.net/KEM.905.78

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Fracture Behavior of the Hot Rolled Strip’s Surface Scale Layer from Different Impacts Angles
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Research on the Cutting of Rectangular Blanks to Solve the Two-Dimensional Problem
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Study on Production Process, Microstructure, Properties of 15MnNbR Pressure Vessel Steel
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Continuous Cooling Transformation Behavior of High Carbon Pearlitic Steel
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The Effect of Substituting Ga for Alon Crystal Structure of Phosphors MAl ₂Si₂O₈: Eu²⁺ (M= Ca, Sr, Ba)
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Improved Optical and Electronic Properties of Single-Layer MoS₂ by Co Doping for Promising Intermediate - Band Materials
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A Novel 1D Organic Lead Halide Hybrid for Blue and White Dual Emission
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Study on Production Process, Microstructure, Properties of 15MnNbR Pressure Vessel Steel

Abstract:

The production process, microstructure, and mechanical properties of 15MnNbR pressure vessel steel were studied by optical microscopy, universal tensile testing, and low-temperature impact toughness testing. It was found that the microstructure obtained after controlled rolling and cooling (known as thermo-mechanical control processing) consisted of ferrite and pearlite with non-uniform grain size. The banded microstructure was prominent, the strength was high, and the toughness was poor. After normalizing, the grain size was refined, both the microstructural uniformity and the banded microstructure were improved, and the strength and toughness of the steel were enhanced. After normalizing and water cooling, the grain was further refined, the microstructure was homogenized, the banded microstructure disappeared, and the strength and toughness of the test steel were improved simultaneously, resulting in excellent comprehensive mechanical properties.