Users who have purchased steel grating, or friends who have carefully read the steel grating standard will know that there are positive and negative errors in many data in the steel grating standard, that is to say, it is used to define whether the steel grating product produced is A qualified data range, within the range, means that the tested indicators are qualified, otherwise it is an unqualified product, which needs to be repaired or re-made by the manufacturer.
So what are the positive and negative errors in the steel grating standard?
1: Thickness error of flat steel: The thickness error of steel grating is within +-0.25mm
2: The external dimension error of the steel grating: within plus or minus 5mm per meter.
3: Diagonal error: the positive and negative errors do not exceed 5mm.
4: Flatness error, no more than 1/200 of its length.
Below is Shangjia's rationale for explaining these data through the production and installation of steel gratings.
1. The thickness error of flat steel is common in steel production. This error range is not easy to control in the production process, mainly because the previous process and the wear of the abrasive tools caused errors to the steel, which is not good. It is controllable, but it can be controlled within this 0.25mm range, and it is suspected of being intentional beyond this range.
2. The overall size of the steel grating is 5mm. This error range is generated by the original plate during the cutting process. If it is within this error, it will not affect the installation and laying of the steel grating. If it is greater than this error, there may be gaps. , or can not be paved, but our company, after years of experience, has basically controlled this error range within 1-2mm.
3. Diagonal error: This error is mainly caused by extrusion or uneven heating during the production of galvanizing, and it can be repaired by plastic surgery.
4. The flatness of the steel grating is due to the pressure welding process of the steel grating welding machine. After the installation and fixing, the steel grating can be completely kept flat. In addition, our company adopts large-scale steel grating pressure welding machine, and the flatness of twist steel and flat steel does not exceed 0.5mm, which is also an important indicator for testing welding quality.
The above steel grating standards are basically based on the level that the existing productivity of the steel grating industry can reach, as well as the physical properties of its materials, installation conditions, and use. can satisfy the use.
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