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The press welded steel grating,requested by the customers,is made of load flat steel bar and cross bars,placed horizontally and vertically,and at an equal pitch apart,by welding with 200-ton hydraulic resistance automatic welding equipment,then cutting,punching and banding ends .
1>stair tread bearing bar pitches may be 15 to 20,25,30,33,35,38,40,50,60,80,90mm,of which 25,30,35 and 40mm are recommended .
2>stair tread cross bar pitches may be 24-200mm,of which 50mm,76mm and 100mm are recommended . 
3>Shape of bearing bars:
F-Plain style
S-Serrated style
I-I-section style
4>stair tread surface treatment:
G-Hot galvanized
P-Painted
U-Untreated
5>stair tread characteristics
1.High strength and light structure
2.Powerful anti-corrosion,durable and long working life
3.Beautiful appearance,bright surface
4.No dirt-rain-snow deposit,automatic cleaning,eay maintenance
5.Good ventilation,day-lighting,heat-dispersing,resistant to sliding and explosion
6.Easy installation and disassembly
stair tread are widely used for plafform,trestles,ladders and fencing in many fields such as petroleum and chemical industry,electric power,water supply,sweat treatment,ship building,parking lots,city construction,environmental ingineering .
Please feel free to contact us at any time concerning your concerns or questions. 
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