Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1628254 | Journal of Iron and Steel Research, International | 2015 | 9 Pages |
Abstract
Temperature deviation between surface and the center of hot rolled strip is formed during ultra-fast cooling (UFC). Surface temperature would rise when temperature deviation goes up to an extent, and strip re-reddening phenomenon will appear. Strip re-reddening affects the stability of strip microstructure, property and temperature control precision. Thus, it is necessary to conduct research on re-reddening temperature changing law to improve strip property and temperature control precision. Strip temperature trends for various strip thicknesses and ultra-fast cooling rates were obtained by numerical calculation method. Re-reddening temperature, temperature deviation between surface and center, and boundary layer position changing law were obtained. By comparison, some conclusions were obtained: UFC re-reddening temperature and laminar cooling (LC) re-reddening temperature were linear to ultra-fast cooling rate respectively. Ultra-fast cooling rate affected UFC re-reddening temperature greatly, but it had little effect on LC re-reddening temperature. Equations which were used to calculate UFC re-reddening temperature, LC re-reddening temperature and maximum temperature deviation were obtained. The position of boundary layer stayed in 1/4 strip thickness.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Lian-yun JIANG, Chun-jiang ZHAO, Jian-hui SHI, Guo YUAN, Xue-qiang WANG, Qing-xue HUANG,