API 5CT Grade N80 Type Q Casing Steel Pipes

API 5CT Grade N80 type Q casing pipe is a medium grade in casing pipe products and has been widely used in oil and gas well drilling activities. Grade N80 has two level N80 type 1 and N80 type Q, more materials available like 9Cr-80 and 13Cr-80.

API 5CT N80 casing manufacturing processes

Like other grades of API 5CT, manufacturing processes includes hot rolled in seamless and ERW welded. In most of the cases the casing pipe adopts the seamless type.

Connection type, ends and Couplings

N80 casing pipe connection type usually refer to BTC, which is buttress thread marked with BC symbol; Other than this type there are short round and long round thread types, corresponding marked as SC or LC symbol. Octal also specialized in supplying premium connections in different types, air proof casing connections. And in case client required, we could customize connection threads and couplings.

N80-1 and N80 Q casing pipe sizes

Casing pipe sizes of N80-1 and N80-Q refer to the pipe diameters equal to or more than 5 1/2” inch. Blow to this size is the tubing.

Chemicals and mechanical strength

For grade N80 type Q the chemicals composition details as: Unit in %, C content 0.28-0.32 (OD above 9 5/8” 244.48 mm, C content is 0.22-0.29), Si content 0.17-0.37, Mn content 1.30-1.45 (OD above 9 5/8” 244.48 mm, Mn content is 1.3-1.60, maximum Cr 0.25, maximum Ni 0.20, maximum Cu 0.20, V 0.07-0.12, maximum P 0.025, maximum S 0.020.
For N80 type 1 is the same chemicals with type Q.
Yield strength for N80 type Q and type 1, is 552 Mpa to 758 Mpa. Tensile strength minimum shall be 689 Mpa.

API 5CT N80 Casing pipe manufacturer and supply range

Standards: API SPEC 5CT casing steel pipe
Grades: N80 type 1, N80 type Q, L80, 9Cr-80, 13Cr-80
Stock Available: Yes
Manufacturing process: Seamless, ERW
Outer Diameter: 5 1/2”, 6 5/8”, 7”, 7 5/8”, 7 3/4”, 8 5/8”, 9 5/8”, 10 3/4”, 11 3/4”, 13 3/8”, 16”, 18 5/8”, 20”
Thickness: 14 LB/FT to 106.59 LB/FT, 0.244” to 0.875”
Coupling thread: BTC, LTC, Buttress (Regular, Special bevel or special clearance), premium connections threads.
Length: R2, R3, customized