Effect of Controlled Rolling and Cooling On Microstructure and Mechanical Properties of 30crmnti Wire Rod

• Published in: IOP conference series. Materials Science and Engineering Vol. 230; no. 1; pp. 12035 - 12039
• Main Authors: Ruan, Shipeng, Dong, Qing, Zhang, Lei, Wang, Lijun
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.09.2017
• Subjects: Bainite; Controlled rolling; Elongation; Finish rolling; Grain size; Mechanical properties; Microstructure; Pearlite; Reduction; Reduction of area; Tensile strength; Wire rod
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/230/1/012035

The effect of controlled rolling and cooling on microstructure and mechanical properties of alloy structure steel 30CrMnTi wire rod with diameter 6.5mm was studied. The results show that the lower finish rolling temperature resulted in a decrease in tensile strength but an increase in elongation and reduction of area. When the finish rolling temperature decreases from 950°C to 850°C, the tensile strength value decreases from 750MPa to 660MPa, and the elongation increases from 21% to 30%, the reduction of area increases from 64% to 71%. The grain size also refines from 20μm to 9.9μm when the finish rolling temperature decreases from 950°C to 850°C. The decrease of tensile strength is due to the change of microstructure which evolved from more bainite to ferrite and pearlite.