20# Galvanized Rectangular Tube

Implementation Standards

1. GB/T3094-2000 (national standard), 2.GB/T6728-2002 (national standard), 3.ASTM A500 (American Standard), 4.EN10219-1-2006 (European standard), 5.JIS G 3466 (Japanese standard)

Scope of Application

The galvanized rectangular tube is galvanized on the square tube, so the application scope of the galvanized square tube has been greatly expanded than the square tube. It is mainly used for curtain wall, building, machinery manufacturing, steel construction projects, shipbuilding, solar powered bracket, steel structure engineering, electric power engineering, power plant, agriculture and chemical machinery, glass curtain wall, vehicle chassis, airport and so on.

Chemical Composition

Chemical composition of the brand (%)
C Si Mn P S
Not greater than

St35 ≤0.18 0.17-0.37 0.35-0.65 0.035 0.035

St37.4(10#) ≤0.18 0.17-0.37 0.35-0.65 0.035 0.035

St45(20#) ≤0.25 0.17-0.37 0.50-0.80 0.035 0.035

St55(35#) ≤0.22 ≤0.55 ≤1.50 0.035 0.035

St52(16Mn) ≤0.20 ≤0.55 ≤1.50 0.035 0.035

CK45 0.42-0.50 0.17-0.37 0.50-0.80 0.035 0.035

Mechanical Property

Performance standard of supply state brand products
tensile strength
MPa yield point
MPa elongation

After the stress annealing BKS is finally cold formed,
Chemical composition and properties of square tube plastic small square tube, in non oxidation
The medium is annealed in the atmosphere. St35 340-470 = 235 = 33
St45 440-570 = 255 = 32
St52 490-630 = 355 = 29

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