API pipe typically refers to steel pipe that complies with specifications set by the American Petroleum Institute (API). The API sets standards for various aspects of oil and gas exploration, production, and transportation, including the materials and manufacturing processes used for pipes and tubing.

Types: API pipes are classified into various types based on factors such as their end connections, dimensions, and intended use. Common types of API pipe include:

API 5L Line Pipe: Used for conveying oil, gas, or water in the petroleum and natural gas industries. It comes in two grades: A (up to X70) and B (X42 and higher).

API 5CT Casing and Tubing: Used to line the walls of a drilled well to prevent collapse and to control the flow of oil or gas. It comes in various grades and specifications depending on the depth and conditions of the well.

API 5DP Drill Pipe: Used to transmit power and drilling fluid from the surface to the drill bit during drilling operations. It's designed to withstand high torque and axial loads.

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Grades of Casing:

API 5CT J55/K55/N80/L80-1/L80-9Cr/L80-13Cr/P110/Q125/K55 D10/L80 D10

Sizes of Casing:

Diameter :from 4 1/2 inch  to 20 inch  （48.26mm - 508mm)

Nominal Weight: from 9.5 lb/ft  to 169 lb/ft

                            from 9.5 ppf  to 169 ppf

Lenght: R1, R2, R3

Types of Casing:

Seamless casing 

ERW casing

Casing nipple

Casing coupling

Coating

Applications: 

oil well extracting casing
borehole casing
borewell casing

Connection: 

BTC, STC, LTC, NUE, EUE

Dimension Tolerance of casing pipe

Chemical Composition of casing pipe

Mechanical properties of casing pipe