Office Chair Support Steel Plate

The selection of thickness and material for the support steel plate of an office chair should be determined comprehensively based on the usage scenario, load-bearing requirements, and structural characteristics, as detailed below:

1. Home office chairs: 1.5-3mm thick SPCC cold-rolled steel plate or Q235B carbon steel
Home scenarios primarily involve daily office work, with load-bearing requirements typically under 100kg. For ordinary single-person use, a 1.5-2mm thick SPCC cold-rolled steel plate (tensile strength ≥270MPa) can be chosen for its low cost and ability to meet basic stability needs; for higher durability, a 2-3mm thick steel plate is more suitable, capable of handling occasional weight fluctuations or frequent adjustments in sitting posture. If higher strength is desired, Q235B carbon steel can be selected, which has superior load-bearing capacity compared to ordinary cold-rolled steel and is suitable for long-term use.

2. Industrial scenarios or high load-bearing requirements: 2.5-5mm thick steel plates
Industrial scenarios (such as factories and laboratories) or high load-bearing requirements (such as for heavier individuals) necessitate thicker steel plates. Hydraulic lift chairs, which need to withstand dynamic pressure, typically use 2.5-3mm thick steel plates, with a maximum load-bearing capacity of over 150kg; for reception areas and other chairs with high usage frequency and the need to accommodate multiple people alternating use, it is recommended to choose 3-5mm thick steel plates to distribute long-term pressure and reduce the risk of deformation. For example, the ErgoHuman series office chairs use a 2.5mm thick Q235B carbon steel frame, which has passed BIFMA-certified static pressure tests (withstanding 100,000 cycles of load-bearing without deformation) and is suitable for high-intensity usage scenarios.

3. Special structural requirements: 3mm or thicker one-piece formed steel plates
The base of a swivel chair (such as the connection point of the five-star foot) needs to withstand multi-directional stress, so it is recommended to use a 3mm one-piece formed steel plate to avoid stress concentration caused by welding; if the chair structure has high requirements for support dispersion (such as curved backrests or floating designs), even if the load-bearing is not high, a 5mm or thicker steel plate may be required to ensure stability. For example, some high-end ergonomic chairs use a 5mm thick steel plate to reinforce the base, enhancing overall torsional resistance.

4. Material and process optimization: Q235B carbon steel + three-layer electrophoretic paint
In terms of material, Q235B carbon steel has stronger load-bearing capacity at the same thickness and excellent welding performance, suitable for complex structures; in terms of process, three-layer electrophoretic paint (with a paint film thickness ≥70μm) is recommended, which has better corrosion resistance than ordinary spray paint and can extend the service life of the steel plate, especially suitable for humid environments. The welding parts must ensure continuous full welding to avoid the risk of fracture caused by false welding.