Microstructure Characteristics and Mechanical Properties of Nb-Mo and Nb Micro-Alloying Hot-Rolled X100 Pipeline Steels

ZHOU Beng; DU Lin-Xiu; ZHOU Min; LIU Xiang-Hua

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Iron and Steel ›› 2012, Vol. 47 ›› Issue (9) : 63-67.

Materials

Microstructure Characteristics and Mechanical Properties of Nb-Mo and Nb Micro-Alloying Hot-Rolled X100 Pipeline Steels

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Abstract

Microstructure characteristics and mechanical properties of Nb-Mo and Nb micro-alloying X100 pipeline steels in a different processing were investigated by means of experimental mill, optical microssope (OM) and transmission electron microscopy (TEM) and universal tensile testing machine and impact testing machine. The results show that it is more obviously for the Nb-Mo alloying steel affected by processing parameters. The mechanical properties of the Nb-Mo and Nb micro-alloying steel in controlled rolling and controlled cooling is up to the standard of API 5L, while the mechanical properties of the Nb-Mo alloying steel is better. With increasing cooling rate and decreasing finished cooling temperature, the strength is enhanced, while the plasticity and toughness is deteriorated. Comparing with the steel with lathed martensite, the plasticity and low temperature toughness of the tested steel with dual phase of lath martensite and bainite is increased.

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ZHOU Beng, DU Lin-Xiu, ZHOU Min, et al. Microstructure Characteristics and Mechanical Properties of Nb-Mo and Nb Micro-Alloying Hot-Rolled X100 Pipeline Steels[J]. Iron and Steel, 2012, 47(9): 63-67

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