Steel grating is usually made of carbon steel and the surface is hot-dip galvanized to prevent oxidation. It can also be made of stainless steel. Steel grating has the properties of ventilation, lighting, heat dissipation, anti-skid, explosion-proof and so on. Testing according to official national testing standards is quite complex. General steel grating customers can't do this. Whether they can use a simple and effective method to judge the quality of steel grating, the answer is yes.
1. Welding quality inspection: It should meet the requirements of firm welded joints, uniform welds, and no virtual welding. The three-point bending test has no welding phenomenon, and it is a qualified product.
2. Steel grating packaging: Steel grating is generally packaged with steel tape and shipped out. The weight of each bundle is determined by both the supplier and the buyer or the manufacturer. With the agreement of both the supplier and the buyer, the supplier can package according to the requirements of the buyer.
3. Performance inspection: The manufacturer should regularly sample the product load performance test and provide test reports according to user requirements. Packaging, logo and quality certificate.
4. Marking: The packaging mark of steel grating should be marked with the trademark or manufacturer code, steel grating model and standard number, each steel grating should be marked with the serial number, and the product quality certificate should be marked with the product standard number, use Steel grade, model specification, surface treatment, appearance and performance inspection results, weight of each batch, etc. The quality certificate should be delivered to the user together 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. Width and thickness detection of flat steel: within the allowable deviation range of ±0.25, it meets the standard and is a qualified product
6. Appearance inspection shape: The appearance inspection of the shape and flatness of the steel grating is carried out one by one.
7. Detection of zinc content on hot-dip galvanized steel grating: allowable zinc content ≥ 70 is a qualified product that meets the standard
8. Hole distance detection: within the allowable deviation ±5%, the standard qualified product
9 Bearing capacity test: The bearing capacity test sample should be a qualified product without deformation and bending.
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