API 5CT K55 Seamless Steel Pipe
API 5CT Grade K55 Heavy Wall Seamless Steel Pipe : Technical Properties & Industrial Applications Key Takeaways ● Grade Definition: API 5CT Grade K55 is a standard OCTG grade designed for casing, tubing, and coupling stock with a minimum yield strength of 55 ksi (379 MPa). ● K55 vs. J55: K55 offers higher ultimate tensile strength (≥655 MPa) than J55, making it ideal for moderate-load oil, gas, and geothermal wells. ● Heavy Wall Advantage: Enhanced collapse resistance, high internal burst pressure rating, and superior toughness for challenging downhole environments. ● Key Applications: Oil & gas casing/tubing, coupling stock, pup joints, geothermal wells, and coalbed methane (CBM) extraction. 1. What is API 5CT Grade K55 Seamless Steel Pipe? Standard & Process Overview (1) Standard Definition & Steel Grade Positioning ...