Abstract:

To implement flow path and capacity expansion reconstruction to built power plant is high efficient and low cost. This is one of the effective measures to increase efficiency, save energy and increase power supply. After boiler heating surface expansion, better metal material was required due to higher temperature and pressure. After capacity expansion, a power plant’s high temperature reheat outlet TP347H pipe leaked. After site inspection, section macroscopic test, chemical test, metallurgical analysis and hardness test, it was found that the material solution treatment was not sufficient after work hardening, and caused performance reduction and leakage.

Key words:

high temperature reheater, TP347H, work hardening, solution treatment, leakage