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700×300 H beam Q235B and Q345B beam, I beam Steel structure Universal Column
1. Simple instruction:
H-beam is a kind of economical section and high-efficiency section with more optimized cross-sectional area distribution and
more reasonable strength-to-weight ratio. It is named after its section is the same as the English letter “H”. Since all parts of
the H-beam are arranged at right angles, the H-beam has the advantages of strong bending resistance, simple construction,
cost saving and light weight in all directions, and has been widely used.
2. Chemical Composition
| Grade | Chemical Composition (%) | ||||
| C | Si | Mn | P | S | |
| Q235B | ≤0.20 | ≤0.35 | ≤1.40 | ≤0.045 | ≤0.045 |
| Q345B | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 |
| Q345C | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.030 |
| Q345D | ≤0.18 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.025 |
3. Mechanical Properties
| Grade | Mechanical Property | ||
| Yield Strength (N/mm2)/(Mpa) | Tensile Strength (N/mm2)/(Mpa) | Elongtation (%) | |
| Q235B | ≥235 | 370-500 | ≥26 |
| Q345B | 345 | 470-630 | ≥20 |
| Q345C | 345 | 470-630 | ≥21 |
| Q345D | 345 | 470-630 | ≥21 |
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