Besides API 5L lipe pipes for oil and gas transportation, API 5CT is widely used in oil drilling platforms, it has been classified into common grade types and special types for fierce environment,for example,corrosive and abrasion. In common applications, most casing tube grades are largely of the same chemical composition. What gives each grade its distinct properties is the kind of heat treatment applied. Casing grades mainly differ in their yield strength, tensile strength, and hardness.
Additional tests required by API 5CT for certain groups of casing make sure that each casing grade is suitable for its intended application.
Due to their lower price compared to other steel grades, casing pipes of grades J55, K55, and N80 are a popular choice for wells without stringent anti-corrosion or strength requirements.
M65, and R95 are newer grades, each with their own field of application. These casing grades mainly differ in their yield strength and tensile strength.
Casing Pipe Types Yield Strength Minimum Tensile Strength API Color Code H40 276-552 MPa (40-80 ksi) 414 MPa (60 ksi) Either none or 1 black band J55 379-552 MPa (55-80 ksi) 517 MPa (75 ksi) 1 bright green band K55 379-552 MPa (55-80 ksi) 665 MPa (95 ksi) 2 bright green bands M65 448-586 MPa (65-85 ksi) 586 MPa (85 ksi) 1 bright green band + 1 blue band N80-1/Q 552-758 MPa (55-80 ksi) 689 MPa (100 ksi) 1 red (N80-1), 1 red band + 1 bright green band (N80-Q) R95 655-758 MPa (95-110 ksi) 727 MPa (105 ksi) 1 brown bandFor more information API 5CT K55 casing, please get in touch with us!