关键词: 加热炉, 温度场, 管材, 有限单元法, 模拟

Abstract: The heating process of 4140 alloy steel pipe in the walking beam reheating furnace was studied by means of experiment and three-dimensional finite element numerical simulation， the temperature change and distribution of the pipe were analyzed. The results showed that the temperature of the head of the steel pipe entering the furnace first was 30-50 ℃ higher than that of the middle and tail part，and there was uneven heating phenomenon along the circumference of the steel pipe. When the temperature exceeded 800 ℃，the temperature difference between each part of the pipe gradually decreased，and the overall temperature tended to be uniform. Below the austenitizing temperature，the heating rate gradually decreased from 0.35 ℃/s to 0 ℃/s，and when the austenitization was complete，it increased slightly and then decreased again. Compared to the middle section， the temperature was higher at both the end and the head of the steel pipe，and the influencing area was less than 200 mm. When the temperature was about 400 ℃，the temperature difference between the end surface and the middle was the largest，reaching 117 ℃. However，the temperature difference gradually decreased to less than 2 ℃ at the end of the calculation. The simulation results were in good agreement with the measured value. When the inner surface of the steel pipe was treated as adiabatic boundary， it had relatively little influence on the temperature，which could make it possible to simplify the model roughly.

Key words:  , Reheating Furnace； Temperature Field； Pipe； Finite Element Method； Simulation