Mild Steel Hollow Square Cross Section Tubes Mechanical Manufacture

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Product Description

Basic Information

Model NO.
ASTM A500 Gr A
Type
Welded
Technique
ERW
Material
Carbon Steel
Surface Treatment
Varnishing
Section Shape
Rectangular
Grade
Gr a
Thickness
0.8--20mm
MOQ
5 Tons
Length
5.5m 11.8m
Tolerance
+/-1%
End
Square Cut
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Detailed Photos

Steel Hollow Section 1
Steel Hollow Section 2
Steel Hollow Section 3
Steel Hollow Section 4
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Product Parameters

Parameter Details
NameMild Steel Hollow Square Cross Section Tubes Mechanical Manufacture
Specification20mm x 20mm - 800mm x 800mm / 20mm x 30mm - 400mm x 800mm
Wall Thickness1.0mm - 30mm
Length1m - 16m or Customized
Steel MaterialQ195 (SS330, ST37), Q235 (SS400, S235JR), Q345 (S355JR, SS500, ST52)
Surface TreatmentBared, Black Painted, Galvanized, Oiled, PE/3PE/FBE Coating
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Normal Size of Square Tubes

Spec (mm)Thickness (mm) Spec (mm)Thickness (mm) Spec (mm)Thickness (mm) Spec (mm)Thickness (mm)
15*150.6-2.216*160.6-2.018*180.6-2.020*200.6-2.0
25*250.6-3.030*300.8-3.034*341.0-3.538*381.0-3.5
40*401.0-3.550*501.2-4.060*601.2-4.080*801.2-5.0
100*1001.2-6.0150*1503.75-8.0200*2004.0-12400*4004.0-12
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Application and Usage

Black steel square pipes are widely utilized for glass curtain walls, power towers, communication grids, water and gas transmission, wire sleeves, housing construction, bridge engineering, and various metal structures due to their exceptional durability and performance.

Application Usage
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Processing & Manufacturing

Factory Overview

Equipped with advanced processing and testing systems including:

  • Hot-rolled production lines
  • Cold-rolled seamless pipe equipment
  • Ultrasonic testing & Element analyzers
  • Customized steel cutting machinery
Hot Rolled
Cold Rolled
Seamless Pipe

Frequently Asked Questions

What are your main steel products?
Our core range includes galvanized steel coils and various steel pipes. We also supply carbon steel coils, stainless steel, corrugated plates, angle steel, H/I beams, and channel steel.
Do you offer customized manufacturing services?
Yes, we provide full customization based on your specific drawings and requirements, including special dimensions, OEM services, and specific material controls.
How do you ensure the quality of the products?
Every product undergoes three strict inspections during production, cutting, and packaging. We provide factory inspection reports and support third-party inspections like SGS or BV.
What is the typical delivery time for orders?
For stock items, delivery usually takes 7-14 days. For custom or out-of-stock orders, the lead time is generally between 25 to 45 days depending on quantity.
Are you a direct manufacturer?
Yes, we are a direct manufacturer with over 17 years of experience in steel pipe and galvanized sheet production. This allows us to offer competitive factory pricing.
Can we request free samples?
Certainly. We provide free samples for quality evaluation. Please reach out to us with your requirements so we can prepare them for you.

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