API 5CT seamless casing and tubing: Grade Test Min MPa or N/mm2 Yield point Tenslie Strength J55 379~552 517 N80 552~758 689 K55 379~552 655 L80 522~655 655 P-110 758~965 862 C90 620-724 690 C95 655~758 724 T95 655~758 724 Packaging & Delivery Packaging Details: Bundles, seaworthy wooden cases With or without end caps, varnish...

The k55 API 5CT casing or tubing is very similar to the J55 type. There is no difference in the chemical composition and yield strength,but the tensile strength of K55 is higher than J55 steel. In actual sales, the price of theses two materials is basically remainded the same,and the purpose is very close. In the oil drilling,K55 API 5CT casing...