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Deep hole boring for duplex SS alloys

15 November 2018

Langley Alloys are now offering deep hole boring from its own facilities. The deep hole boring capability is a perfect complement to its extensive range of solid and hollow bars.

Large bores, up to 200mm internal diameter and over 2m in length have been produced in the last few weeks. The company has recently processed a range of high-strength super duplex, including Ferralium 255-SD50 and nickel alloys such as Alloy 825, as well as stainless steels.

Deep hole boring can be used to bridge the gap between solid bars and hollow bars. Unlike the company’s hollow bar stock range, deep hole boring is not limited to a handful of stainless steels. Also, it can produce exact dimensions rather than be limited to standard sizes, and there is no real limit to the minimum order quantity, all without mill production lead times of weeks and months.

Deep hole boring, or deep hole drilling as it is sometimes referred to, is a process to create long holes through solid bars where the diameter to length ratio (D:L) of the hole can be greater than 10.

The company uses a STS (single tube system), where the cutting tool is mounted on a long hollow bar that travels through the centre of the bar. During boring, large quantities of cutting fluid are pumped through the STS to the end of the bore, to carry away the swarf.

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