What are the methods and inspection standards for inspecting steel gratings

The steel grating is generally made of carbon steel, and the surface is hot-dip galvanized to prevent oxidation. It can also be made of stainless steel. The steel grille has the properties of ventilation, lighting, heat dissipation, anti-skid, and explosion-proof.
Testing according to the national formal testing standards is quite complicated. General steel grating customers can’t do it, can it be effective with simple methods To judge the quality of steel grating, the answer is yes.

1. Welding quality inspection: it should meet the requirements of firm welding joints, uniform welding seams, and no false welding. There is no open welding phenomenon in the three-point bending test, which is a qualified product.
2. Steel grating packaging: steel gratings are generally packed with steel belts and shipped out. The weight of each bundle is determined by the supplier and the demander or by the manufacturer. Upon agreement between the supplier and the demander, the supplier can pack according to the demand of the demander.
3. Performance inspection: The manufacturer should regularly sample product load performance tests and provide test reports according to user requirements. Packaging, marking and quality certificate.
4. Marking: The packaging mark of the steel grating should be marked with the trademark or manufacturer code, steel grating model and standard number, each steel grating should be marked with a serial number, and the product quality certificate should be marked with the product standard number, Use steel grades, model specifications, surface treatment conditions, appearance and performance inspection results, weight of each batch, etc. The quality certificate shall be delivered to the user along with the product packing list as the basis for acceptance. If the user has requirements, we can provide the raw material quality assurance certificate.
5. Detection of flat steel width and thickness: within the allowable deviation of ± 0.25, it meets the standard and qualified products
6. Visual inspection of shape: The shape and flatness of steel gratings should be visually inspected one by one.
7. Detection of the amount of zinc on the hot-dip galvanized steel grating: the allowable amount of zinc ≥70 is a qualified product that meets the standard
8. Detection of hole spacing: within ±5% of the allowable deviation is in line with the standard qualified products
9. Bearing capacity test: It should be a qualified product with no deformation or bending in the test sample of bearing capacity.