# Study on Microstructure and Properties of Q460 Steel at Different Ni Contents

## TL;DR

This study examines how different nickel contents affect the microstructure and mechanical properties of Q460 steel.

## Contribution

The study identifies the optimal Ni content for balancing strength and ductility in Q460 steel.

## Key findings

- Higher Ni content increases inclusions and promotes bainite formation in Q460 steel.
- Yield and tensile strength improve with Ni, but elongation and impact energy do not.
- A Ni content of 0.3% is recommended for optimal cost and performance.

## Abstract

Q460 steel with varying Ni contents was produced via the hot continuous rolling process. The microstructure and properties were examined using scanning electron microscopy (SEM) and universal testing machines. The results show that with increasing Ni content, the number of inclusions rises, and the microstructure gradually evolves from ferrite and pearlite to a mixture of ferrite, pearlite, and bainite. Due to the formation of bainite and refined grains, both the yield strength and tensile strength are significantly improved. However, with the increase in inclusions, the elongation and impact energy of the material do not exhibit substantial enhancement. Considering both cost and performance, the Ni content in Q460 steel is preferably controlled at 0.3%.