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Oct 19, 2023Liked by Giuliano

I have no idea why someone should invest in such industries. Sure also today so called "safe harbours" can or will be disrupted some day, but steel never had any moat, high competition, low margins, cyclical...

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Hi Giuliano, great article brings back many memories. Two of my first Businesses were in the Steel Industry, one was United Steel: that was in Structural Steel Fabrication and Erection up to 300 Tonnes.

SteelCorp: Was in the Steel Reinforcing Industry and was the First company in Queensland, Australia to incorporate Tapered Threading on Reo Bars for the Construction industry.

In the old days when high rise went up, we used to weld the reo bars end to end, so builders could lay concrete and to go to the next floor as the building rose, or just use lap splicing. It was very slow, labor intensive, we had to drag a welder every where etc.

There was a better way.

I invested in and worked on a new technology in the 80's called Tapered Threading, that allowed me to use a machine, imagine a mobile Plumbers Pipe Threading Machine, about that size.

I would put a course tapered thread on each end of the reo bar, diameter sizes from 12mm up to 50mm Diameter. Small diameter size threading at beginning of reo and widening out the diameter as I got further down the reo bar. The length of the tapered thread was about 50mm to 100mm depending on reo size.

A standard parallel thread is not strong enough to hold the reo bars because they can be in tension or compression, so had to redistribute the weight into not only the threads, but also the diameter of the reo bar and the female Coupler/Collar because of it's strength.

Then the spliced reo bars can behave as continuous lengths of reinforcing steel bars by providing “full strength” in tension, compression and stress reversal applications. It also develops higher tensile strength than lap splicing and provides full load transfer with the slimmest and shortest coupler possible.

The Female Couplers which also had 2 internal tapered threads, one at each end of the coupler and meeting in the middle for inserting and turning the reo bar, and were made in machine shops. This joining system also allowed builders to join different diameter sizes of reo bar together, it was much stronger than side by side (lap splicing) much faster and had a longer life.

So thank you very much for the walk down memory lane.

all the best

Kev Borg

Kiwi

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Oct 16, 2023Liked by Giuliano

Thanks my friend! I was looking forward to the article...

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