Steel Tube for Bridge Building

Bridge and building often use seamless structural steel water pipes. We mainly adopt ASME A519 typical. Representative steel grades include 20#, 45#, Q345-Q460, 40Mn2 and 45Mn2.
Competitive Advantages

  • Top of steel tube for bridge building is outstanding quality. Will take a very no visible crack, wrinkling, rolling skin and abscission layer by the inside and outside finish. We can completely prefer live in . flaws as well as the removal depth is a no-no to exceed the negative deviation of nominal wall thickness. After removal process, the actual wall thickness of this structural steel pipe mustn't be less space-consuming than the allowable minimum wall thickness change.
  • Of course have professional inspection personnel who will detect the unobvious inner and outer surface defects on seamless steel ink cartridges. If find any flaw, they can do well polishing, removal, repair and then a series of processes dependant upon their specific characteristics. These processes are executed in accordance with relevant standards.
  • Stop smoking . above treatment, our inspectors will check structural steel pipes far more. We also measure the wall thickness to guarantee stable performance of steel tube for bridge manufacturing.

Technical Parameters

1. Dimension Deviation of This Seamless Structural Steel Pipe

Type Outside Diameter (D) Wall Thickness (S)
Cold-Drawn Pipe Outside Diameter of Steel Pipe (mm) Allowable Deviation (mm) Wall Thickness of Steel Tube (mm) Allowable Deviation (mm)
> 30-50 ± 0.3 ≤ 30 ± 10%
> 50-219 ± 0.8%
Hot-Rolled Pipe > 219 ± 1.0% > 20 ± 10%

2. Mechanical Properties of Steel Tube for Bridge Building

Standard Grade Tensile Strength (Mpa) Yield Strength (Mpa) Elongation (%)
ASTM A53 ASME SA53 A ≥ 330 ≥ 205 Refers to ASTM A53 table and ASME SA53 table.
B ≥ 415 ≥ 240

3. Chemical Composition of This Structural Steel Pipe

Standard Grade Chemical Composition (%)
ASTM A53 ASME SA53   C Si Mn P S Cu Ni Mo Cr V
A ≤ 0.25 / ≤ 0.95 ≤ 0.05 ≤ 0.06 ≤ 0.40 ≤ 0.40 ≤ 0.15 ≤ 0.40 ≤ 0.08
B ≤ 0.30 / ≤ 1.20 ≤ 0.05 ≤ 0.06 ≤ 0.40 ≤ 0.40 ≤ 0.15 ≤ 0.40 ≤ 0.08

 

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