Q: What is the density of Q235?
A: It's the same as ordinary steel, 7.85 g/cm³.
Q: What is the typical hardness of Q235?
A: In its untreated state, the Brinell hardness (HB) is approximately 120-150, which is relatively low, resulting in good machinability.
Q: How is the corrosion resistance of Q235?
A: It has poor corrosion resistance and no rust prevention capability. It is prone to rusting in humid environments and requires rust prevention methods such as painting or galvanizing.
Q: How is the high-temperature resistance of Q235?
A: It can be used stably below 200℃. Above 300℃, its strength decreases significantly, making it unsuitable for high-temperature applications.
Q: How is the low-temperature performance of Q235?
A: The lower the quality grade, the worse the low-temperature toughness:
Grade A: Easily brittle at low temperatures, unsuitable for low-temperature environments;
Grade D: Can be used at -20℃, with good toughness.