hot rolled API 5CT,J55 K55 seamless steel oil casing and tubing in oil field
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The steel grades of common oilfield API-5CT casing pipe include J55, K55, N80-1, N80Q, and P110. Casing pipe is mostly used for oil well drilling. In accordance with API-5CT and ISO11960 standard, pipes can be classified as STC (short thread), LTC (long thread) and BTC (buttress thread) accompanied with their couplings.
Production Process of API 5CT,J55 K55 seamless steel oil casing and tubing
Hot rolling (extruding seamless steel pipe): Circular tube billet→ Heating→ Piercing→ Three-roller skew rolling, tandem rolling or extrusion→ Tube knockout→ Sizing (or tubing reduction) → Cooling→ Straightening→ Hydraulic test (or flaw detection) → Marking→ Entering warehouse
Detailed Specifications
| Standards | API SPEC 5CT |
| Model in Common Use | 2-3/8″, 2-7/8″, 3-1/2″, 4″, 4-1/2″ |
| Length Range | R1(6.10-7.32m), R2(8.53-9.75m), R3(11.58-12.8m) |
| Steel Grade | J55, K55, N80-1, N80-Q, L80, P110 |
| Type of Screw Thread | Non upset threaded end(NUE), External upset threaded end(EUE) |
2 Comments
What is the size range of the K55 / J55 casing pipe ?
Length range up to 7.62 m (25′)
Available in casing dimensions of 114.3 mm (4.5″) to 508 mm (20″)
General purpose pipe manufactured to API specification 5CT. Similar to J55 but the minimum tensile strength is higher
Available in mechanical tube dimensions of 101.6 mm (4″) od to 533.4 mm (21″) od / 7.52 mm (0.3″) wall to 32.13 mm (1.27″) wall