API Specification 5CT Seamless Steel Pipe Oil Casing J55/K55/N80/L80/C90/T95/P110/Q125/V150
Introduction to API specification 5CT seamless steel Pipe Oil Casing API Specification 5CT Seamless Steel Pipe Oil Casing J55/K55/N80/L80/ C90/T95/P110/Q125/V150 the Oil and gas industry relies heavily on the use of seamless steel pipe oil casing for various applications. these casings are used to protect the wellbore during drilling and production operations. API Specification 5CT…
Introduction to API specification 5CT seamless steel Pipe Oil Casing
API Specification 5CT Seamless Steel Pipe Oil Casing J55/K55/N80/L80/ C90/T95/P110/Q125/V150 the Oil and gas industry relies heavily on the use of seamless steel pipe oil casing for various applications. these casings are used to protect the wellbore during drilling and production operations. API Specification 5CT is a widely recognized standard for seamless steel pipe oil casings, and it provides guidelines for the manufacturing, testing, and inspection of these casings. Seamless steel pipe oil casings are made from high–quality carbon or alloy steel, and they are designed to withstand high pressure and temperature conditions. The J55, K55, N80, L80, C90, T95, p110, Q125, and V150 grades are commonly used in the industry, and each grade has its own specific properties and applications. J55 and K55 grades are typically used for shallow wells with low pressure and low temperature conditions. These grades have good toughness and are suitable for mild sour environments. N80 grade is a medium-strength casing that is commonly used in medium-depth wells. It has a higher tensile strength and better resistance to corrosion than J55 and K55 grades. L80 grade is a higher-strength casing that is used in deeper wells with higher pressure and temperature conditions. It has a controlled yield strength and excellent resistance to corrosion. C90 grade is similar to L80 grade but has a higher yield strength. It is commonly used in high-pressure wells.Tensile and Hardness requirements | |||||||||
Grade | Yield Strength MPa | Tensile Strength | Hardness a,c | Specified wall thickness | Allowable Hardness Variation b | ||||
type | Total Elongation Under Load | min MPa | max | ||||||
min | max | HRC | HBW | mm | HRC | ||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
H40 | — | 0.5 | 276 | 552 | 414 | — | — | — | — |
J55 | — | 0.5 | 379 | 552 | 517 | — | — | — | — |
K55 | — | 0.5 | 379 | 552 | 655 | — | — | — | — |
N80 | 1 | 0.5 | 552 | 758 | 689 | — | — | — | — |
N80 | Q | 0.5 | 552 | 758 | 689 | — | — | — | — |
R95 | — | 0.5 | 655 | 758 | 724 | — | — | — | — |
L80 L80 | 1 | 0.5 | 552 | 655 | 655 | 23 | 241 | — | — |
L80 | 9Cr 13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | — | — |
0.5 | 552 | 655 | 655 | 23 | 241 | — | — | ||
C90 | 1 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | £12.70 | 3 |
12.71 to 19.04 | 4 | ||||||||
19.05 to 25.39 | 5 | ||||||||
³ 25.40 | 6 | ||||||||
T95 | 1 | 0.5 | 655 | 758 | 724 | 25.4 | 255 | £12.70 | 3 |
12.71 to 19.04 | 4 | ||||||||
19.05 to 25.39 | 5 | ||||||||
³ 25.40 | 6 | ||||||||
C110 | — | 0.7 | 758 | 828 | 793 | 30 | 286 | £12.70 | 3 |
12.71 to 19.04 | 4 | ||||||||
19.05 to 25.39 | 5 | ||||||||
³ 25.40 | 6 | ||||||||
P110 | — | 0.6 | 758 | 965 | 862 | — | — | — | — |
Q125 | 1 | 0.65 | 862 | 1034 | 931 | b | — | £12.70 | 3 |
12.71 to 19.04 19.05 | 4 | ||||||||
5 | |||||||||
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. | |||||||||
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9. | |||||||||
c For through-wall hardness tests of Grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number. |