Rectangular Pipe Classification and method Torque tube Use and common material chemical elements of square tube
Square and rectangular pipes are classified according to process
Square and rectangular tubes are divided into hot rolling according to consumption process Seamless square tube Cold drawn seamless square tube, extruded seamless square tube, welded square tube.
The welded square pipe is divided into:
1. According to the process - arc welding square tube, resistance welding square tube (high-frequency, low-frequency), gas welding square tube, furnace welding square tube
2. It is divided into straight seam welded square tube and spiral welded square tube according to weld seam.
Square and rectangular pipes are classified by material
Square pipes are divided into plain carbon steel square pipes and low-alloy square pipes according to their materials.
1. Ordinary carbon steel is divided into Q195, Q215, Q235, SS400, 20 # steel, 45 # steel, etc.
2. Low alloy steels include Q345, 16Mn, Q390, ST52-3, etc.
According to consumption specifications, square tubes are classified into: national standard square tubes, Japanese standard square tubes, British standard square tubes, American standard square tubes, European standard square tubes, and non-standard square tubes.
Square and rectangular pipes are classified according to section shape
1. Simple section square tube: square square tube, rectangular square tube.
2. Complex cross-section square tube: flower shaped square tube, tooth shaped square tube, corrugated square tube, special-shaped square tube.
Square and rectangular pipes are classified according to surface treatment
Square tubes are divided into hot-dip galvanized square tubes, electrogalvanized square tubes, oiled square tubes and pickled square tubes according to their appearance.
Square tube is classified by use
Square tubes are classified according to their uses: square tubes for decoration, machine tool equipment, machinery industry, chemical industry, steel structure, shipbuilding, automobile, steel beam and column, and special purpose.
Square and rectangular pipes are classified according to wall thickness
Square and rectangular tubes are classified according to wall thickness: extra thick square and rectangular tubes, thick square and rectangular tubes and thin-walled square and rectangular tubes
Thick walled rectangular tube
Use of square tube:
Application: It is widely used in machinery manufacturing, construction, metallurgy, agricultural vehicles, agricultural greenhouses, automobile industry, railways, highway guardrails, container frameworks, furniture, decoration and steel construction.
It is used in engineering buildings, glass curtain walls, door and window decoration, steel construction, guardrail, machinery manufacturing, automobile manufacturing, home appliance manufacturing, shipbuilding, container manufacturing, electricity, agricultural construction, agricultural greenhouses, bicycle racks, motorcycle racks, shelves, fitness equipment, leisure and tourism products, steel furniture, various specifications of oil casing, oil pipes and pipeline pipes, water, gas, sewage Air, heating and other fluid escorts, fire protection and support, construction industry, etc.
Square tube for farm implements
Common materials of rectangular tube Chemical composition:
20 #: uniform carbon content is 0.17-0.23%, uniform silicon content is 0.17-0.37%,
The uniform manganese content is 0.35-0.65%, the uniform sulfur content is ≤ 0.035%, and the uniform phosphorus content is ≤ 0.035%,
Uniform chromium content ≤ 0.20%, uniform nickel content ≤ 0.30%,
About 0.20% copper
Q345B rectangular tube
Q345B C≤0.20 Si≤0.50 Mn≤1.70 P≤0.035 S≤0.035 V≤0.15 Nb≤0.07
27SiMn rectangular tube
27SiMn
C：0.24～0.32
Si：1.10～1.40
Mn：1.10～1.40
P：≤0.035
S：≤0.035
Cu：≤0.30
Cr：≤0.30
Ni：≤0.30
Mo：≤0.15
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