CARBON STEEL H BEAM Q690 HN member is not only subjected to axial forces but also to bending moments caused by seismic loading. Therefore, its cyclic response is expected to be relatively complex and is quite essential for seismic design. Previous studies have demonstrated that steel beam-columns under seismic loading may undergo strength and stiffness deterioration driven by local buckling or low-cycle fatigue damage, resulting in the remarkable changes in their hysteretic behavior
CARBON STEEL H BEAM Q690 HN Mechanical Properties
| Q690 Yield Strength (≥N/mm2); Thickness or Dia. d (mm) | ||||||
| Standard | Steel Grade | Quality | d≤16 | 16<d≤40 | 40<d≤63 | 63<d≤80 |
| GB/T 1591 – 2008 | Q690 | C, D, E | 690 | 670 | 660 | 640 |
| GB/T 1591 – 2018 | Q690M | C, D, E | 690 | 680 | 670 | 650 |
CARBON STEEL H BEAM Q690 HN Chemical Composition
| Q690 Chemical Composition (%) | ||||||||||||||||
| Steel Grade | Quality Grade | C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | B | Al |
| Q690 | Q690C | ≤ 0.18 | ≤ 0.60 | ≤ 2.00 | ≤0.030 | ≤0.030 | ≤ 0.11 | ≤ 0.12 | ≤ 0.20 | ≤ 1.00 | ≤ 0.80 | ≤ 0.80 | ≤ 0.015 | ≤ 0.30 | ≤ 0.004 | ≥ 0.015 |
| Q690D | ≤0.030 | ≤0.025 | ||||||||||||||
| Q690E | ≤0.025 | ≤0.020 | ||||||||||||||
CARBON STEEL H BEAM Q690 HN made from Q690 material has high yield strength and tensile strength and is widely used in coal mine machinery and engineering machinery, such as hydraulic support, port cranes, flatbed trucks and so on.
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