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Structure Works
Structure Works
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Carbon & Alloy Steel Pipe for General Structures

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(a retaining wall as part of flood control project is under construction for a river bank at Hunan Province, China)

Standards

GB/T8162 Seamless steel tubes for structural purposes
ASTM A252 Welded and Seamless Steel Pipe Piles
ASTM A500/M Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
ASTM A513/M Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing
EN10219 Cold formed welded structural hollow sections of non-alloy and fine grain steels
EN10210 Hot rolled structural steel bars, rods and sections

Manufacture Process Flowcharts

SAWH (spiral seam welded pipe):
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SAWL (longitudinal seam welded pipe):
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General Applications

For the manufacture of underground structures, foundation piles, steel building structures, general equipment and mechanic parts and other general steel structure purpose.
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Chemical Components

Standard Grade c Si Mn P s Cr Ni Cu V
GB/T 8162 10 0.07-0.13 0.17-0.37 0.35-0.65 ≤0.025 ≤0.020 ≤0.15 ≤0.30 ≤0.25 -
20 0.17-0.23 0.17-0.37 0.35-0.65 ≤0.025 ≤0.020 ≤0.25 ≤0.30 ≤0.25 -
35 0.32-0.39 0.17-0.37 0.50-0.80 ≤0.025 ≤0.020 ≤0.25 ≤0.30 ≤0.25
45 0.42-0.50 0.17-0.37 0.50-0.80 ≤0.025 ≤0.020 ≤0.25 ≤0.30 ≤0.25
Q345A ≤0.20 ≤0.55 1.00-1.60 ≤0.025 ≤0.020 ≤0.30 ≤0.30 ≤0.30
Q345B ≤0.20 ≤0.55 1.00-1.60 ≤0.025 ≤0.020 ≤0.30 ≤0.30 ≤0.30
Q345C ≤0.20 ≤0.55 1.00-1.60 ≤0.025 ≤0.020 ≤0.30 ≤0.30 ≤0.30 0.02-0.15
Q345D ≤0.18 ≤0.55 1.00-1.60 ≤0.025 ≤0.020 ≤0.30 ≤0.30 ≤0.30 0.02-0.15
Q345E ≤0.18 ≤0.55 1.00-1.60 ≤0.025 ≤0.020 ≤0.30 ≤0.30 ≤0.30 0.02-0.15
DIN 1629 St37.0 ≤0.17 0.17-0.37 0.35-0.65 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25
St44.0 ≤0.21 0.17-0.37 0.50-0.80 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25 -
St55 0.33-0.41 0.17-0.37 0.50-0.80 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤025
St52.0 ≤0.22 ≤0.55 ≤1.60 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25 -
CK45 0.42-0.50 0.17-0.37 0.50-0.80 ≤0.025 ≤0.020 ≤0.25 ≤0.25 ≤0.25
Note: Grades other than the above chart can be made available through consultations.

Mechanic Properties

Standard Grade Tensile strength (MPa) Yield strength not less than          (MPa) Elongation

not less than

 lmpact test
Temperature (℃) Absorbed energy (KV/J)
≤16mm >16-30mm
GB/T 8162 10 ≥335 205 195 24 -   -
20 ≥410 245 235 20   -
35 ≥510 305 295 17   -
45 ≥590 335 325 14   -   -
Q345A 470-630 345 325 20
Q345B 470-630 345 325 20 20 34
Q345C 470-630 345 325 21 0 34
Q345D 470-630 345 325 21 -20 34
Q345E 470-630 345 325 21 -40 27
DIN 1629 - ≤16mm >16mm - - -
St37.0 350-480 235 225 25 -
St44.0 420-550 275 265 21   -
St55 540-645 295 285 17
St52.0 500-650 355 345 21   -
CK45 590-730 335 325 14
For more details on specific carbon and alloy steel tubing and pipes, please refer to the specific product details or contact us at your convenience.
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