Study on rolling process and heat treatment of high strength ship plate steel EH40

Chunquan Liu,Qichun Peng,Zhengliang Xue

doi:10.30544/372

Abstract

Means of a tensile test studied the mechanical properties and microstructure of the experimental steel plate under different rolling processes, Charpy impact test, optical microscopy and scanning electron microscopy (SEM). The results show that the optimum thermomechanical control process (TMCP) is a heating temperature of 1200 °C, the best rolling temperature of 1180 °C. The thickness of the ship plate steel was rolled from 170 mm to 40 mm in the recrystallization zone by multi-channel time deformation, and then the thickness was decreased from 40 mm to 15mm in the non-recrystallization zone, the temperature waiting for a range 980 °C ~ 920 °C, the finish rolling temperature of 830 °C. After rolling and being cooled rapidly by laminar cooling, the cooling rate is about 12 °C/s and the final target temperature of 600 °C, which maintains the best state of steels. All data of the experimental steels have accelerated the international level, high-strength ship plate EH40 has been successfully trialed and met the practical requirements, all of these provide a solid foundation for further scientific research.

Highlights

In recent years, the ship's maximization, high-Speeding, and development of offshore oil-gas fields have provided a broad practical prospect for high-strength hull structural steel [1,2,3,4]
Through the normalizing treatment, the coarse Widmanstatten Structure and the black unbalanced structure existing in the TCMP process of the experimental steel can be eliminated, and by refining the grain, we can significantly improve the impact property of the steel plate
2) The rolling and normalizing treatment steel of EH2 has better elongation and impact toughness at different temperatures, but its yield strength and tensile strength are lower than the national standard level, which does not meet the requirements

Summary

Introduction

The ship's maximization, high-Speeding, and development of offshore oil-gas fields have provided a broad practical prospect for high-strength hull structural steel [1,2,3,4]. C. Liu et al - Study on Rolling Process and Heat Treatment of High Strength Ship ...

Results

Conclusion