1. STANDARDS ON STEEL PALISADE FENCES

2. QUALITY OF STEEL

What is HOT ROLLED ANGLE IRON?
During the production process in the steel plant e.g. Highveld Steel, Iscor, the steel is rolled in red hot condition into angle iron, and then cooled down to normal temperatures. Hot rolled angle iron is structural steel.
These are the advantages of hot rolled angle iron:
a.) It's measurements are accurate and based on the norm and determined by the 'South African Bureau Of Standards' (SABS).
That means: when you buy a panel from us, e.g. 3m wide x 2m high, 40x40x2mm angel iron, you can rely on the fact that the angle's are to SABS standards.
b.) Another very important point: The physical properties (molecular structure) of the angle iron is of such nature, that it can only be bent by heavy forces. If you try to bend it by hand or with a hammer, the angle iron is elastic and goes back into it's original position. That means: Hot rolled angel iron is elastic up to a certain point (elastic limit). The physical properties of hot rolled angle iron is regulated by the SABS
c.) The material is strong & long lasting
d.) As the material is strong, it provides a good surface for galvanizing. Refer to our BOLTED PALISADE FENCE, which are as well available as galvanized panels.
The advantages of hot rolled angle iron Bolted Palisade Fence:
• Economical transportation throughout South Africa
• Containers can be filled up to capacity (weight limit) especially for export!!!
• Quality product, especially for export!!!
• No stacking necessary on uneven ground and same gap at the bottom of fence
• Hole fence can be dismantled and re-erected at other locations 
• Therefore no waste
• Easy to install

What is COLD ROLLED ANGLE & PROFILES?
Cold rolled angle is made out of OFF CUTS from sheet metal coils.
Sheet metal coils are used e.g. in the automotive industry for pressing the body parts of the car (bonnets, doors). For this purpose, the sheet metal has to be soft.
Some other fence manufacturers use these soft strips for another purpose than it is made for. They bend it in cold condition to angles, to make pales for palisade fences.
These are the disadvantages of  cold rolled angle:
a.) No institution in South Africa regulates the strength and measurements of these angles
b.) The spikes can be bent easily with the thumb
c.) The pales (uprights) can be bent open between the top and bottom cross bar, Housebreakers bend the pales of the fence easily and slip through the gap
d.) Cold rolled steel corrodes easily because the steel pieces are oil treated. When you buy these fences, the oil is never properly removed. Disadvantage: paint does not stick on oily surfaces, and the paint will peel off after a short time.
e.) Even galvanized cold rolled fences can corrode, as galvanizing is a different kind of coating only. Should the pales get bent there is a break in the surface and corrosion starts.
f.) Flanges of the angles are not accurate (we experienced tolerances up to 8mm)
g.) In the long run cold rolled angles are therefore more expensive and bring the industry into discredit of delivering bad quality (corrosion of palisade fences, inaccurate and weak angles).

3. HOT DIP GALVANIZING OF PALISADES

Corrosion Protection
Hot Dip Galvanizing protects steel in two ways:
• Barrier protection by the provision of a corrosion resistant barrier
• Sacrificial protection of any damaged areas. This prevents under film attacks

Performance of Hot Dip Galvanizing - Guideline, with average coating of 110nm

Description	Severity of Corrosion	Corrosion Rate uncoated Mild Steel	Zinc Coating Loss
usually less than 50m from H.W.M. usually 50m to 1km from H.W.M. 1km to 40km from sea 40km to100km from sea Inland Inland Urban Inland Urban Coastal	Severe Marine Marine Average Marine Mildly Marine Rural Desert Industrial Marine Industrial	+300nm/year 200-300 nm/year 20-200nm/year 10-20 nm/year less than 10nm/year less than 5nm/year 10-30 nm/year 50-150 nm/year	> 30nm/year 15-30 nm/year 2-15nm/year 1-2nm/year < 0.8 nm/year < 0.5 nm/year 1-3nm/year 5-15 nm/year

 

4. PALISADE SIZES & MEASUREMENTS

5. WALL SPIKES SIZES

6. HINTS FOR INSTALLATION DIY:

Should you want to install the palisade fences yourself, here are a few hints:
• Do not plant all the posts first, and then insert the palisade fences in-between. Rather plant two posts, weld a palisade panel, plant one post, weld a palisade panel, and so on
• Weld steel pieces (anchors) on the bottom of the posts, so that nobody can pull them out after the concrete has dried out. Please note: our posts include the flat pole cap & the bottom mounting anchors
• When you plant the posts, use a water level
• If you need a gate, and you have never welded before, rather ask us, we can manufacture the gate(s) for you
• If you still want to weld something yourself, remove all thinners & paint from the welding place, as thinners / paint might catch fire from welding sparks
• Should it rain, or the ground is wet, do not use electricity
• Secure any electrical extensions and cables so that nobody can step on it
• Use only proper electrical devices
• Looking in a welding arc can cause serious damages to the eyes, wear a proper welding helmet
• Cut steel is very sharp, to avoid injuries, wear thick leather gloves during handling and installation
• Do not rush, accidents occur then
• Please note: welding is a trade. There are many more things to know. If you want quality work, it is better, if the job is done by a professional
• Our H. R. BOLTED PALISADE FENCE is easy to install, if you want to avoid welding, rather go for this option.
Please note: we do not take any responsibility for any damage or injuries whatsoever.

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