We have 30 high frequency pipe welders with an annual production of 2 million tons. In addition, we established one warehouse more than 10k square meters in Hangzhou to supply pipes to south China. Ningbo Kyson Cool Electronic Technology Co., Ltd. , https://www.zjkysoncool.com
Square Tube Product Show:
We supply all kinds of tubes either of black or galvanized surface based on customer's request length, with size range from
Round: Â 10mm to 165mm
Square: 10x10mm to 500x500mm
Rectangular: Â 10x20mm to 400x600mm
Our Workshop and Facility:
Our factory is located in Hebei province. 
Square Tube Appliation:
Square tubes are widely used for structure, furniture and fencing and so on field.
1. Square Tube Material: ASTM A500 Q195 Q235 Q345 S275JR, S355JR, etc.
2. Square Pipe Production Technique: ERW Welded
3. Square Pipe Specifications:
Diameter: 20X20mm~500X500mm
Thickness: 1.0mm~18mm
Length: 6m or cut as request
Addition:
1: Anti-corrosion and high-temperature resistant with hot dipped galvanizied coating or painting.
2: All the production process are made under the ISO9001: 2000 strictly
3: With BV certificate, DNV certificate, ISO9001-2000, SGS inspection.
4. Square Pipe Standards: ASTM A500, BS1387-1985, GB/T3094-2008, JIS3466, GB/T6728-2002
5. Square Pipe Packing:
A. Galvanized: Packed by steel strips
B. Black steel hollow: Packed by steel strips and tarpaulin
C. Woven cloth with 7 slats
D. According to the requirements of customers
6. Usage of Square Pipe: Mechanical & manufacture, Steel structure, Ship building, Bridging, Automobile chassis, construction, etc.
7. Main market: Middle East, South American, Africa, Asia and some European country and America, Australia, etc.
8. Zinc coating(if): Pre-galvanized: 50-120G/M2; Hot DIP galvanized: 200-480G/M2
9. Productivity: 60, 000 Metric Tons per Month
10. Remarks:
A. Payment terms: T/T, L/C
B. Terms of trade: FOB, CFR, CIF, DDP, EXW
C. Minimum order: 5 tons
D. Lead time: 7-30 days.
Specification of ASTM A500 Q195 Q235 Q345 S275 B Grade ERW Structural Mild Steel Square Pipes
Square steel pipe
Size
WT(mm)
  Rectangular steel pipe
 Size
WT(mm)
 20*20
 1.0-2.5
 20*30
 1.0-2.75
 25*25
 1.0-2.75
 20*40
 1.0-2.75
 30*30
 1.0-2.75
 25*40
 1.0-2.75
 40*40
 1.2-3.75
 30*50
 1.0-4.75
 50*50
 1.2-5.75
 30*60
 1.2-4.75
 60*60
 1.2-5.75
 40*50
 1.2-4.75
 70*70
 1.2-5.75
 40*80
 1.2-4.75
 80*80
 1.2-5.75
 50*70
 1.3-4.75
 90*90
 1.2-5.75
 50*80
 1.3-4.75
 100*100
 1.5-12
 60*90
 1.3-4.75
 120*120
 2.5-12
 50*100
 1.3-5.75
 140*140
 2.75-16
 50*150
 1.3-5.75
 150*150
 2.75-16
 60*160
 1.3-5.75
 160*160
 3.0-16
 100*150
 2.5-16
 180*180
 3.0-16
 100*200
 2.5-16
 200*200
 3.0-16
 100*250
 2.5-16
 250*250
 4.75-16
 150*300
 4.5-16
 300*300
 4.75-16
 200*300
 5.5-16
 400*400
 4.75-25
 200*400
 5.5-16
 500*500
 4.75-25
 400*600
 5.5-25
200X200mm Welded Carbon Steel Square Structural Steel Pipe (SQ200-1)
Model NO.: SQ200-1
Square Pipe Diameter: 1/2′′x1/2′′~20′′x20′′
Square Pipe Thickness: 0.04′′~0.725′′(1.0~18mm)
Square Pipe Standard: GB/T3091, DIN2395, JIS 3466, Bs 6363, ISO 2938
Square Tube Material: Q195, Q235, Q345, S235jr, S355jr, St37-2, St52
Square Pipe Length: 6m or Cut as Request
Square Pipe Application: Construction Structural, Wall Screens, Frame
Trademark: CERTEG or Buyer′s Brand
Transport Package: Steel Belt in Bundles
Specification: 20x20~500x500mm
Origin: China(Mainland)
HS Code: 73066100
200X200mm 10mm Thick 20feet Length Common Carbon Welded Steel Square Tubes