Pre-galvanized Steel Pipe size chart The pre galvanized square tubes are protected from rust and corrosion since they are galvanized. Steel rusts over time when it comes into contact with water or moisture in the air. Pre galvanized square steel pipe corrodes considerably more slowly after being coated with zinc, extending the life of your tubing. Pre galvanized square pipe also has the following advantages: lower cost than stainless steel, lowest long-term cost reliable performance and excellent mechanical damage resistance. SPECIFICATION 鈥斺€斺€?/span> Product Name: Pre galvanized square tube Out Diameter: 20x30-100x100mm Thickness: 0.7 - 2.5mm Length: 6m or as per customer's requirement Pipe Ends: Plain. Grade: Q195-Q235 For light steel keel, guardrail net, peach shaped column, sink, rolling shutter door, bridge and other metal products. Pre-galvanized pipe Rectangular and Square pipe Diameter (mm)Thickness (mm)Diameter (mm)Thickness (mm)Diameter (mm)Thickness (mm) 20*300.7~2.230*600.7~2.515*150.7~2.0 20*400.7~2.530*650.7~2.516*160.7~2.0 20*500.7~2.530*700.8~2.519*190.7~2.2 20*600.7~2.535*400.8~2.520*200.7~2.3 20*750.7~2.535*450.8~2.525*250.7~2.3 20*800.7~2.530*500.8~2.530*300.7~2.3 25*300.7~2.530*600.8~2.532*320.7~2.3 25*400.7~2.530*650.8~2.535*350.7~2.3 25*500.7~2.530*700.8~2.538*380.7~2.3 25*600.7~2.535*400.8~2.540*400.7~2.3 25*650.7~2.535*600.8~2.545*450.75~2.5 25*700.7~2.535*800.8~2.548*480.75~2.5 25*750.7~2.540*500.8~2.550*500.75~2.5 30*350.7~2.540*600.8~2.560*600.75~2.5 30*400.7~2.540*800.8~2.575*750.9~2.5 30*450.7~2.550*750.9~2.580*801.2~2.5 30*500.7~2.550*1000.9~2.5100*1001.2~2.5 PRODUCTION FLOW 鈥斺€斺€?/span> QUALITY INSPECTION 鈥斺€斺€?/span> PACKING AND LOADING 鈥斺€斺€?/span> PROCESSING 鈥斺€斺€?/span>Pre-galvanized Steel Pipe size chart website:http://www.xxtsteels.com/pre-galvanized-steel-pipe/