Reasons for errors in steel grating

Users who have purchased steel grating know that many data points in steel grating standards have positive and negative tolerances. These tolerances define a range for determining whether a manufactured steel grating product is (qualified/acceptable). Products within this range are considered(qualified/acceptable), while those outside are (unqualified/unacceptable) and require repair or remanufacturing by the manufacturer.

Types of tolerances in steel grating standards:

1. Flat bar thickness tolerance: Within ±0.25mm;

2. Steel grating dimensional tolerance: Within ±5mm per meter;

3. Diagonal tolerance: Not exceeding ±5mm;

4. Flatness tolerance: Not exceeding 1/200th of its length.

Reasons for errors:

1. Thickness error of flat steel is common in steel production. This error range is difficult to control in the production process, mainly due to the previous process and wear of the molds, which cause errors in the steel. It is difficult to control, but within a 0.25mm range, it is controllable. Exceeding this range raises suspicion of intentional error.

2. 5mm error in the outer dimensions of the steel grating. This error range is caused by the cutting process of the original plate. If the error is within this range, it will not affect the installation of the steel grating. If it is greater than this error, gaps may appear, or installation may be impossible.

3. Diagonal error: This error is mainly caused by extrusion or uneven heating during the galvanizing process. It can be corrected.

4. Flatness of the steel grating is caused by the pressure welding process of the steel grating welding machine. After installation and fixing, the steel grating can maintain perfect flatness.