S355 Q355 square and rectangular hollow sections are high-strength, corrosion-resistant steel pipes commonly used in structural engineering, construction and machine manufacturing. Q355 steel has excellent welding properties and tensile strength, making it suitable for a variety of engineering projects and structural applications. These pipes are often used to carry significant loads and in harsh environments because their material properties provide reliable support and durability.
S355 Q355 Square and Rectangular Steel Pipe Datas:
| Product |
Square and Rectangular Steel Pipe |
| Material |
Carbon Steel |
| Standard |
EN10219, GB/T 6728 |
| Surface |
Bare/Natural BlackPaintedOiled with or without wrapped |
| Ends |
Plain ends |
| Specification |
OD: 20*20-500*500mm ; 20*40-300*500mmThickness: 1.0-30.0mmLength: 2-12m |
S355 Q355 Square and Rectangular Steel Grade:
| Chemical composition for product thickness ≤ 30 mm |
| Standard |
Steel grade |
C (max.)% |
Si (max.)% |
Mn (max.)% |
P (max.)% |
S (max.)% |
CEV
(max.)% |
| EN10219 |
S355J0H |
0.22 |
0.55 |
1.6 |
0.035 |
0.035 |
0.45 |
| EN10219 |
S355J2H |
0.22 |
0.55 |
1.6 |
0.03 |
0.03 |
0.45 |
| GB/T1591 |
Q355B |
0.24 |
0.55 |
1.6 |
0.035 |
0.035 |
0.45 |
| GB/T1591 |
Q355C |
0.2 |
0.55 |
1.6 |
0.03 |
0.03 |
0.45 |
| GB/T1591 |
Q355D |
0.2 |
0.55 |
1.6 |
0.025 |
0.025 |
0.45 |
| Mechanical properties of non-alloy steel hollow sections in thicknesses ≤ 40 mm |
| Standard |
Steel grade |
Minimum yield
strength
MPa |
Tensile strength
MPa |
Minimum elongation
% |
Minimum impact
energy
J |
| WT≤16mm |
>16mm ≤40mm |
< 3mm |
≥3mm ≤40mm |
≤40mm |
-20°C |
0°C |
20°C |
| EN10219 |
S355J0H |
355 |
345 |
510-680 |
470-630 |
20 |
- |
27 |
- |
| EN10219 |
S355J2H |
355 |
345 |
510-680 |
470-630 |
20 |
27 |
- |
- |
| GB/T1591 |
Q355B |
355 |
345 |
470-630 |
20 |
- |
- |
27 |
| GB/T1591 |
Q355C |
355 |
345 |
470-630 |
20 |
- |
27 |
- |
| GB/T1591 |
Q355D |
355 |
345 |
470-630 |
20 |
27 |
- |
- |
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Square and Rectangular Steel Pipes Product Tests:
Strict Quality Control:
1) During and after production, 4 QC staffs with more than 5 years experience inspect products in random.
2) National accredited laboratory with CNAS certificates
3) Acceptable inspection from third party appointed/paid by buyer, such as SGS, BV.
4) Approved by Malaysia, Indonesia, Singapore, Philippines, Australia, Peru and UK. We own UL /FM, ISO9001/18001, FPC certificates
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