Special shaped stair treads for spiral staircase,Spiral stair tread

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Special shaped stair treads for spiral staircase,Spiral stair tread

1. Spiral stair tread Material:
Mild Steel (Low CaTbon Steel) or Stainless Steel
2. Types of steel grating for spiral stair tread:
-Flat type: the most widely steel grating.
-Serrated type: With better no-slip.
-"I" type: On the surface,path and items not in the same flat.With the character of light weight,economic and practical. 3.Spiral stair tread Surface Treatment:
Untreated, Painting ,Powder coated or Hot dip Galvanizing 4.Spiral stair tread welding procedure: Edge bars and attachments are welded with a minimum 3mm fllet weld to one side of:
-Every 5th load bar on Series 30 Grating
-Every 4th load bar on Series 40 Grating
-Every 3rd load bar on Series 60 Grating
-Full Weld:Weld one side of every load bar.
-Seal Weld: Weld both sides of every load bar.

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