Italy's Arvedi Tubi Acciaio has an annual production capacity of 600,000 metric tons of welded carbon steel tubing.

Comprised of 11 manufacturing plants and 13 business units, Plymouth Tube is a family-owned company and a global specialty manufacturer of carbon alloy, nickel alloy, and stainless precision steel tubing. Plymouth Engineered Shapes manufactures titanium, stainless, nickel alloy, carbon & alloy semi-finished extrusions and semi-finished shaped bar.

Atlas Tube, a division of the JMC Steel Group, is a hollow structural sections (HSS) producer. Its main plant is in Harrow, Ont., and additional plants are in Chicago, Ill.; Blytheville, Ark.; Plymouth, Mich.; and Winnipeg, Man.

The Prolamsa Group was established in 1954 and is a leading producer of pipe and tubular products in North America. It currently operates major mills and distribution centers in Mexico and Texas.

Axis Pipe and Tube is a new 300,000-plus tons-per-year pipe and tubular products facility being built by the Prolamsa Group in Bryan, Texas.

PTC Alliance, formerly Pittsburgh Tube Co., was founded in 1924 and is headquartered in Wexford, Pa. It has nine manufacturing facilities located in Pennsylvania, Ohio, Illinois, Missouri, Indiana and Kentucky.

Benteler Steel/Tube, a business unit of the global Benteler Group, which is headquartered in Salzburg, Austria, is building a 320,000-ton-per-year facility in Louisiana. Construction is on track to be completed in late 2014, with manufacturing operations beginning in the second half of 2015.

The Severstal Izhora Pipe Mill specializes in manufacturing large diameter pipes from strip made by Cherepovets Steel Mill. Header pipes of large diameter are used primarily for major pipeline construction projects aimed at implementation of energy strategy of Russia.

Sooner Inc., headquartered in Houston, Texas, is one of the largest OCTG distributors in the U.S.

Turkish steel pipe manufacturer, Borusan Mannesmann, is building a 300,000-ton-per-year ERW OCTG facility in Houston, Texas.

CSI is the only West Coast steel supplier manufacturing five different product lines: hot rolled, pickled and oiled, galvanized and cold rolled sheet, and electric resistance welded pipe.

Synalloy Corporation is a growth oriented company that engages in a number of diverse business activities including the production of stainless steel pipe, fiberglass and steel storage tanks, specialty chemicals and fabrication of stainless and carbon piping systems.

Tejas Tubular Products is a manufacturer and supplier of OCTG to the petroleum industry.

Tenaris is a leading supplier of tubes and related services for the world’s energy industry and certain other industrial applications. Tenaris consists of a network of manufacturing facilities, service yards and commercial offices that spans the globe. It is a subsidiary of the Italian group Techint.

Energex Tube is an OCTG and line pipe producer in North America. It has operating facilities in Thomasville, Ala.; Welland, Ont.; and Wheatland, Pa.; and two processing plants under construction in Thomasville. Previously known as Lakeside Steel, Energex was made a division of JMC Steel Group after JMC's purchase of Lakeside in 2012.

OAO TMK (TMK) is Russia’s largest manufacturer and exporter of steel pipes. It has production plants in Russia, the U.S. (TMK IPSCO), Romania and Kazakhstan.

Headquartered in Houston, TMK IPSCO is a North American producer of welded and seamless pipe and premium connections. It is a subsidiary of Russia's TMK.

China's Tianjin Pipe (Group) Corp. is investing US$1 billion through TPCO America (with U.S.-joint venture partners) to build a seamless pipe manufacturing facility in Gregory, Texas.

JMC Steel Group is the largest independent manufacturer of tubular products in North America, producing more than 2.0 million tons of tubular products each year through its 12 manufacturing facilities.

Spain's Tubos Reunidos is global leader in niche segments of specialty seamless steel tubular products.

Lakeside Steel was a diversified steel pipe and tubing manufacturer with a focus on manufacturing OCTG. It was purchased by the JMC Steel Group in 2012 and is now known as Energex Tube.

U. S. Steel is one of the largest North American tubulars producers, manufacturing standard and line pipe, as well as OCTG.

France's Vallourec is a world leader in premium tubular solutions primarily serving the energy markets, as well as other industrial applications.

Headquartered in Chicago, Ill., Maruichi Leavitt Pipe & Tube operats several tubing mills with facilities in Chicago and Jackson, Miss. In 2008, Maruichi Steel Tube LTD of Japan acquired a majority interest in Leavitt Tube, renaming it Maruichi Leavitt Pipe & Tube.

Vallourec Star, previously known as V&M Star, is a North American producer of seamless OCTG, line & standard pipe, coupling stock and mechanical tube.

Welded Tube of Canada is a multi-faceted cold formed carbon and HSLA steel tubular producer, headquartered in Concord (Toronto), Ont.

Headquartered in South Lyon, Mich., Michigan Seamless Tube (MST) is a manufacturer of high-quality carbon and alloy seamless cold-drawn pipe and tube with an annual production capacity of 40,000 tons. MST is a wholly-owned subsidiary of Miami-based Optima Specialty Steel, Inc.

Welspun has a diversified manufacturing base with its core facilities in Anjar, Gujarat, India, as well as other units in different parts of India, and one plant each in the U.S.A. and Saudi Arabia.

MRC Global is a global distributor of pipe, valve and fitting (PVF), products and services to the energy and industrial markets.

Headquartered in Vancouver, Wash., Northwest Pipe is a welded pipe manufacturer with plants throughout the U.S. and Mexico.

Wheatland Tube is a welded pipe producer and part of the JMC Steel Group.