JFE Steel Completes First Shipment of UOE Steel Pipe for Sour Linepipe Requiring Stringent Surface-hardness Specifications

31 May 2024

JFE Steel Corporation announced today that it has manufactured and completed its first shipment of UOE steel pipe1 for sour linepipe requiring stringent surface-hardness specifications, amounting to 86,000 tons of the product for a pipeline that will transport sour gas2 in Southeast Asia.

To prevent sulfide stress cracking3 in the hardened portion of a sour gas pipeline’s outer surface layer, the hardness must be lower than that of ordinary linepipe. JFE Steel’s West Japan Works (Fukuyama District) manufactures a wide range of high-performance steel plate and linepipe steel using its proprietary Super-OLAC®-A controlled-cooling technology to precisely control the uniformity and cooling rate.
JFE Steel used this technology to manufacture steel plate with reduced hardness over the entire surface.

In addition, the company developed measuring equipment capable of precisely determining the surface hardness of steel plate based on electromagnetic properties.4 The resulting UOE steel pipe for sour linepipe ensures the stringent hardness specifications required over the pipe’s entire surface.

The selection of JFE Steel for this order reflects the customer’s confidence in the company’s long track record of supplying high-grade steel pipe for various pipeline projects around the world, as well as its proven product quality and supporting steel-pipe manufacturing technology.

Going forward, JFE Steel will continue to contribute to the global development of resources and energy by providing high-performance, high-quality steel products such as its UOE steel pipe.

  1. Large-diameter welded steel pipe made of thick steel plate for transporting fluids such as oil and natural gas.
  2. Natural gas with a hydrogen sulfide partial pressure of at least 0.003 bar.
  3. Hydrogen migrating into steel exposed to hydrogen sulfide in a sour gas can embrittle the steel and cause cracking when the steel is stressed. Higher concentrations of hydrogen sulfide and/or loading may result in increased cracking.
  4.  An external voltage is applied to a sensor on steel surface to measure changes in magnetic flux as a function of the steel’s mechanical properties.