Q: Is Q235 steel suitable for scaffolding and formwork support?
A: Yes, it is suitable. Q235 welded pipes or angle steel are commonly used, but wall thickness and erection specifications must be strictly controlled.
Q: What documents need to be checked when Q235 steel arrives on site?
A: Quality certificate (furnace batch number, chemical composition, mechanical properties), certificate of conformity, specifications, and grade markings.
Q: What are the batch and item requirements for Q235 steel re-inspection upon arrival?
A: For the same grade, furnace batch number, and specifications, each batch should be 60 tons; less than 60 tons is considered one batch. Mechanical properties (yield strength, tensile strength, elongation) must be re-inspected. Impact tests should be performed if impact is required; for Z-direction steel, reduction of area should be tested.
Q: What are the common surface defects of Q235 steel and their judgment criteria?
A: Common defects include scratches, pitting, rust, and folds. Steel with a depth not exceeding the negative thickness deviation and not affecting structural safety can be used; cracks and delamination are strictly prohibited.
Q: How to distinguish Q235 from other steels (such as Q355)?
A: Verify the quality certificate, perform spectral analysis of the chemical composition, and conduct mechanical property tests on samples to avoid mixing.