What Is The Difference Between Line Pipe And OCTG?

Oil Country Tubular Goods (OCTG)

Meeting the fundamental requirement of a fully martensitic microstructure even at large pipe wall thickness requires good hardenability. Cr and Mn are the main alloying elements used to produce good hardenability in conventional heat-treatable steel. However, the requirement for good sulphide stress cracking (SSC) resistance limits their use. Mn tends to segregate during continuous casting and can form large MnS inclusions that reduce hydrogen induced cracking (HIC) resistance. Higher levels of Cr can lead to formation of Cr7C3 precipitates with coarse plate-shaped morphology, which act as hydrogen collectors and crack initiators. Alloying with Molybdenum can overcome the limitations of Mn and Cr alloying. Mo is a much stronger hardener than Mn and Cr, so it can easily recover the effect of a reduced amount of these elements.

Traditionally, OCTG grades were carbon-manganese steels (up to the 55-ksi strength level) or Mo-containing grades up to 0.4% Mo. In recent years, deep well drilling and reservoirs containing contaminants that cause corrosive attack have created a strong demand for higher strength materials resistant to hydrogen embrittlement and SCC. Highly tempered martensite is the structure most resistant to SSC at higher strength levels, and 0.75% is the Mo concentration that produces the optimum combination of yield strength and to SSC resistance(1)

For more than a century, U. S. Steel Tubular Products has provided solutions for the oil and gas industry. Oil country tubular goods (OCTG) manufactured by U. S. Steel Tubular Products are widely used across the global oil and gas industry.

Today, just as in the past, we are dedicated to serving our energy customers through an array of casing and tubing products designed to meet a new generation of challenges.

OCTG Casing and Tubing Pipe

U. S. Steel Tubular Products has an annual capacity of 1.9 million net tons for tubular products, much of which is used by the oil and gas industries. Our facilities can provide a wide range of high-quality, high-strength, high toughness, seamless and high frequency electric weld (ERW) pipe.

U. S. Steel Tubular Products manufacturing facilities are licensed by the API to produce API monogrammed 5CT and 5L products.

API monogram licenses are only issued after an onsite audit by the API to verify that the licensee conforms to the requirements of API Q1 (QMS Requirements for Oil and Gas Industry), and that 5CT & 5L products are produced under the control of a Q1 quality management system.

Additionally, U. S. Steel Tubular Products facilities in Lorain, Fairfield, and Lone Star tubular facilities have been audited and certified by a third party registrar to be in conformance with ISO 9001(Quality Management System Requirements).

*U. S. Steel Tubular Products ERW pipe is HFW as defined by API 5L.
**For pipe sizes not found in the section above, please contact U. S. Steel Tubular Products at 877-893-9461 with your inquiry.

OCTG Connections

U. S. Steel Tubular Products has responded to the challenges of demanding field conditions with OCTG connections that are user friendly on the rig floor while meeting high-torque, high-pressure and high-build rate requirements. Our advanced line of premium connections and semi-premium connections has been specially designed for drilling conditions encountered in shale plays and other extended reach drilling applications.

USS-EAGLE SFH®: Semi-flush premium casing connection that is ideal for horizontal and clearance critical wells, available in outside diameters sizes from 4-1/2 to 7-5/8 inches.

USS-LIBERTY TC®: Threaded and coupled casing connection for the most challenging wells including horizontal and extended reach wells, available in outside diameters sizes from 4-1/2 to 10-3/4 inches.

USS-PATRIOT TC®: Specifically designed for extended reach drilling applications with outside diameter sizes from 4-1/2 to 7-5/8 inches.

USS PATRIOT EBM®: This tough connection is designed to perform in the most severe conditions, including high-pressure gas, high temperatures, corrosive service and thermal wells.

USS-LIBERTY FJM®: Ideal for close clearance liners this connection repairs liners for damaged casing and has outside diameter sizes from 3-1/2 to 8-5/8 inches.

USS-CDC®: Designed for unconventional shale plays, horizontal wells, and economical casing drilling, this connection comes in 4-1/2 to 13-3/8 inch sizes.

USS-CDC HTQ®: Best for horizontal drilling, hydraulic fracturing, and other applications requiring the need for higher torques and resistance to bending stresses. Connection comes in 4-1/2 to 7 inch sizes.

Designed for surface casing applications and intermediate offshore strings. Connection comes in outside diameters ranging from 16 to 20 inches.

Designed forConnection comes in outside diameters ranging from 16 to 20 inches.

What are Oil Country Tubular Goods?

The term Oil Country Tubular Goods describes tubes that are used in oil and gas production: As a rule these include drill pipe, casing and tubing.

Oil Country Tubular Goods are used both onshore and offshore. In the industry, they are also referred to by the acronym OCTG (for “Oil Country Tubular Goods”). Each wellbore proceeds in multiple phases, during which

drill pipe,

casing (lines the wellbore), and

tubing (delivery or production tubes that transport the oil and gas to the surface)

are used alternately. With voestalpine Tubulars, voestalpine has an experienced and reputable OCTG manufacturer in the Group. The company, which is based in Kindberg, Austria, is a world leader in high-strength, seamless Oil Country Tubular Goods.

Individual customer requirements

The American Petroleum Institute (API) stipulates precisely standardized specifications that define the properties of Oil Country Tubular Goods and classify them into ten grades. These properties are achieved through the chemical composition of the steel and subsequent heat treatment.