Carbon Square Tube

Description

Carbon steel square tube is a common metal tube, and its definition and key features are as follows:
Basic definition
Carbon steel square tube is a square cross-section tube made of carbon steel as the main material, with a square or rectangular cross-section and a hollow structure. Its name comes from the shape of the square tube and the material carbon steel.
Material composition
Carbon steel: The main components are iron (Fe) and carbon (C), and the carbon content is usually 0.06%~2.0%. Trace elements may include manganese (Mn), silicon (Si), sulfur (S), phosphorus (P), etc.
Classification: According to the carbon content, it can be divided into low carbon steel (such as Q235), medium carbon steel and high carbon steel. Square tubes are mostly made of low carbon steel to balance strength and machinability.
Manufacturing process
Forming method:
Welded square tube: After cold/hot rolled steel plate is curled and formed, it is welded (such as high frequency welding, arc welding).
Seamless square tube: After round steel is pierced and cold drawn or hot rolled, there is no weld and higher strength.
Post-treatment: may include pickling, galvanizing, painting and other anti-corrosion treatments.
Classification standards
Cross-sectional shape: square (equilateral) or rectangular (rectangular).
Wall thickness: thin wall (decorative) or thick wall (structural load-bearing).
Implementation standards: such as GB/T (China), ASTM (USA), JIS (Japan), etc.Core characteristics
High strength: excellent load-bearing and compression resistance.
Processability: easy to cut, weld, and bend.
Economic efficiency: lower cost than alloy pipes such as stainless steel.
Anti-corrosion requirements: surface treatment (such as galvanizing) is required to prevent rust.
Application areas
Building structure: steel structure frame, roof truss.
Machinery manufacturing: equipment bracket, conveying system.
Automobile/ship: chassis components, guardrails.
Decoration engineering: stair handrails, display racks