Research and Development of L80-13Cr Upset Tubing with Premium Threads

Described here are the activities associated with the R& D and trial manufacture of the L80-13Cr upset tubing with premium threads.Based on the analysis of the deformation characteristics of the L80-13Cr steel, and relevant actual production experience, the end upsetting process for the said tubing is determined.And based on analysis of the mechanical property characteristics of the L80-13Cr steel, the heat treatment process for the pipe is set up.which involving setting the austenization temperature as 980℃, and air-cooling the pipe down to 50℃ below. The testing results demonstrates that the upset end dimensions and microstructure of the L80-13Cr upset tubing with premium threads are up to the design requirements, and its body and end mechanical properties are uniform, while its tensile property, impact toughness and hardness are all in compliance with the requirements as specified under API Spec 5CT-2011.