The microstructure and mechanical properties of an API 5CT L80 casing grade steel (0.24C 0,4Si 1.4Mn CrNiCu) have been studied after performing weld thermal simulations (with and without subsequent tempering) applying a thermal cycle weld simulator. Specimens were subjected to three different peak temperatures (1300 °C, 1150 °C, 950 °C) and five different cooling rates (1 °C/s, 3 °C/s, 5 °C/s, 10 °C/s, 60 °C/s) through the austenite transformation temperature range. Based on the microstructure, hardness values, and toughness properties of the simulated specimens, thermal cycles were selected and recommended for welding of L80 components by the SAG-FW (shielded active gas forge welding) method.

在使用热循环焊接模拟器进行焊接热模拟（有和没有后续回火）后，研究了 API 5CT L80 套管级钢（0.24C 0,4Si 1.4Mn CrNiCu）的微观结构和机械性能。样品经受三种不同的峰值温度（1300 °C、1150 °C、950 °C）和五种不同的冷却速率（1 °C/s、3 °C/s、5 °C/s、10 °C/s , 60 °C/s) 通过奥氏体转变温度范围。根据模拟试样的显微组织、硬度值和韧性性能，选择并推荐热循环用于通过 SAG-FW（保护活性气体锻造焊接）方法焊接 L80 部件。