Study of the Coefficient of Thermal Expansion for Steel Q235
The dynamic coefficient of thermal expansion for steel Q235 during cooling was investigated using experimental measurements and model calculations. The coefficient of thermal expansion under 1400°С was measured with a thermal dilatometer. The coefficient was derived from a segregation model of two-phase zone for of temperature range of 1400°С to zero-strength temperature (ZST). The obtained results reveal that the coefficient of thermal expansion shows two jumps in the temperature zone of the peritectic reaction and the eutectoid reaction. The anti-expansion phenomenon caused by the eutectoid reaction in the cooling process corresponds to the low-temperature crack-sensitive area. Therefore, the slab straightening process should be avoided in this temperature range during continuous casting.
Jianmin Zeng, Taosen Li, Shaojian Ma, Zhengyi Jiang and Daoguo Yang
J. X. Fu et al., "Study of the Coefficient of Thermal Expansion for Steel Q235", Advanced Materials Research, Vols. 194-196, pp. 326-330, 2011