The steel grid plate is made of domestic high-quality Q235 low carbon steel, and the surface is treated by hot-dip galvanizing to prevent oxidation. It can also be made of stainless steel, but at a higher cost. The cross bar of the steel grid plate is generally composed of twisted square steel, which can be used as a ditch cover plate, a steel structure platform plate, a tread plate of a steel ladder and the like. Due to the ventilation, lighting, heat dissipation, anti-skid and explosion-proof properties of the steel grid plate, the hot-dip galvanized steel grating has been widely used and recognized in many industries around the world as a new type of building material. As the demand for steel gratings continues to increase, manufacturers continue to increase, and some users will not know how to choose when purchasing steel gratings.
First, let's see if galvanizing is hot-dip galvanizing. Tips for identifying galvanized steel gratings: Galvanized steel gratings are divided into electrogalvanized (cold galvanized) and hot-dip galvanized. Some customers have purchased galvanized steel gratings online. After using them for some time, they found It is rusting. Because it is cold galvanized, hot-dip galvanizing will not rust. This often happens because customers lack some professional knowledge.
1. When buying galvanized steel grating, touch the thickness of the steel grating by hand. The thickness of the ordinary ordinary galvanized steel grating is relatively thin, the thickest is 10um, and the coating thickness of the galvanized steel grating is It reaches 70um or more.
2. The thickness of the basic galvanized layer is high, and the price can be higher, but the actual height is not much higher. Through the comparison of multiple manufacturers, if the price difference is too much, then it must be false or the quality is definitely not qualified.
Second, the workmanship of the steel grating: the surface of the steel grating is clean and the welding gap is small. The steel grating is fine and firm. The manufacturing process of steel grid plates is not complicated, but the welding technology is high: generally, it is welded by a fully automatic computer controlled welding machine, and the pressure welded steel grid plate is made of load flat steel and cross bar at a certain distance. After the enthalpy arrangement, 200 tons of hydraulic resistance welding automation equipment is used to weld the original board, and the products are required by deep processing such as cutting, opening and edge processing. The center distance of two adjacent loaded flat steels is usually 30mm or 40mm. Crossbar spacing: The center spacing of two adjacent rails is usually 50mm, 100mm, and others can be produced according to customer requirements. Various types of steel grid plate products can also be customized according to customer requirements. For the selection of the model of the steel grating: know the bearing value and the installation span, and it is convenient to use the model related to the steel grating in the “Safety Load Load and Span and Deflection Relationship Table”.
Third, the price of hot-dip galvanized steel grid: Many customers only unilaterally pursue the price of steel grid when purchasing. Of course, everyone wants to buy good quality products at the cheapest price. But there are a lot of misunderstandings in the purchase of steel gratings. Low-priced steel grating products are generally due to large errors in the thickness of flat steel. This poses a safety hazard for applications where the load force requirements are relatively high. From the perspective of production capacity and capital capacity, it is best to choose a manufacturer with good reputation and quality assurance.
4. Whether the steel gratings are installed after the rule: generally rectangular (rectangular), whether the solder joints are fully welded and firm. If you are a hand-welded steel grating, you need to pay special attention. Whether the cut of the twisted square steel (twist steel) welded on the side can be parallel to the covered flat steel. Whether the zinc slag and welding slag are clean.
5. The platform for the purchase of steel gratings shall comply with the following requirements: 1. When the design load value is x1.5, it shall be guaranteed that permanent deformation will not occur. 2. When the design load value is x3.0, the guarantee does not produce fracture.