Peards Garden Supplies in Albury sell Corten steel edging in 2.4m lengths and various widths (ours are 100mm).
Can’t remember the brand name.
The top is rolled to form a 10mm lip. Joiners are simply a short piece of the same, inverted so the lip of the joiner locks the bottom edge, and the ‘bottom’ edge slips into the lip at the top. All fixed together with 12mm self-tapping hex-head screws (supplied). Also supplied are 300mm flat steel pegs (which also fit inside the lip) to locate the edging.
The 2.4m lengths can be gently bent to whatever curve you need, as I have on the “Final” garden bed and the new tank surround. Check out the last two sets of garden pics… you can see in the pic of the western part of the “Final” bed just how tight a curve you can get. But it needs care to bend it without kinking it. I’ll take some detail pics tomorrow.
Meantime, here’s a detailed pic of the “odds & sods”:
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Screws (lots!); joiner (100x100mm); 300mm peg/spike.
The only difference between the joiner & the edging is that the edging is 100mm x 2.4m.
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Close-up showing the rolled top of the joiner.
Obviously the spike is driven into the ground until only 100mm is showing, and the 2.4m edging piece is slipped over it so the spike sits inside the rolled top, then it’s secured in place with a hex-head screw. Arguably the screw is redundant, but I’m a ‘belt & braces’ guy…
I place spikes at every joint and the mid-point of each length, meaning there’s a locating spike every 1.2m.
I also pre-drill a 3.5mm hole for the 4mm screws… quality variations in the steel of the self-tapping screws means they sometimes don’t ‘self’.