Capital Star Steel SA uses the high frequency induction welding (HFI) process to manufacture pipes ranging in nominal diameter from 219 mm (8 inch) to 610 mm (24 inch), and in various wall thicknesses.

In the ERW manufacturing process, steel coil is mechanically formed into the required pipe diameter, after which a high-frequency electrical current is applied to fuse pipe skelp to form a weld. Since no filler material is added, the weld joint becomes a homogeneous part of the completed pipe, thereby ensuring that the required engineering strength and performance specifications are met. See Table 2.

A completely smooth and high performance pipe is ensured via the process of removing the weld beads both internally and externally. From raw material through to finished pipe, the product undergoes the stringiest international standard quality testing, thereby guaranteeing you the highest quality. Immediately after the welding, the weld seam is ultrasonically inspected on the line.

To ensure that the grain structure of the weld joint is normalized, the heat affected zone (HAZ) is annealed, thereby ensuring that the grain structure is homogeneous throughout the diameter and length of the pipe.

The pipes are then sized to required tolerances before being cut to length and the ends bevelled. Thereafter the pipe is hydrostatically pressure tested before it is once again ultrasonically inspected to ensure quality compliance to the required standard/ specification.

Pipes are inspected, weighed and marked, and can be varnished prior to final acceptance and dispatch. They may also be transferred to the coating and lining plant for corrosion protection treatment as required by the specification or clients needs.

Typical uses of Capital Star Steel Pipes
Capital Star Steel SA pipes can be used in a variety of projects. The under mentioned list provides you with just a few of the applications our products are suited for;

• Oil & Gas Transmission including off shore lines
• Casings and Screens
• Water Transmission
• Penstocks for Hydroelectric Power Projects
• Sewerage Transmission and Outfalls
• Structural Members for Bridges and Buildings
• Foundation Piles for Buildings & Harbours
• Steam Transmission
• District Heating Pipes
• Abrasive Slurry
• Industrial Waste e.g. Acids down to pH 2.5, Alkali > pH 9
• Fabricated steel pipe bends and fittings
• Rectangular & Square Section for structural applications