GB 8KG light rail is mostly made of Q235B ordinary carbon structural steel, and its density is usually about 7.85g/cm³, which is the typical density of steel and an important basic data in the light rail specification parameter system.
The density of 7.85g/cm³ determines the theoretical weight of the light rail. Combined with the size parameters of GB 8KG light rail, the rail height is 65mm, the bottom width is 54mm, the head width is 25mm, and the waist thickness is 7.0mm. Through the calculation of volume and density, the theoretical weight is 8.42kg/m. This theoretical weight is not only an important indicator of the light rail product specifications, but also provides an accurate weight reference for transportation, warehousing and construction links, helping engineers to rationally plan the load of transportation tools, storage space and construction hoisting equipment selection.
From the perspective of material properties, Q235B steel has good comprehensive performance while ensuring a density of 7.85g/cm³. Its density is balanced with strength and toughness, ensuring that the light rail has stable structural support during use and can withstand the operating pressure of light locomotives, while not causing excessive weight due to excessive density, which increases the difficulty and cost of construction. In the laying of temporary transportation lines in forest areas, mining areas, etc., the appropriate density makes the
installation of light rail more convenient, while meeting the basic performance requirements of temporary transportation for tracks.
| Q235B | Mechanical property | Chemical composition(%) | |||||||||
| Yield strength | Tensile strength | Elongation | Hardness | C | Si | Mn | S | P | |||
| MPa | kg/mm² | MPa | kg/mm² | min | HB | ≤ | ≤ | ≤ | |||
| ≥ | ≥ | ||||||||||
| 235 | 24 | 375-460 | 38-47 | 26% | 0.12-0.22 | 0.35 | 0.30-0.70 | 0.045 | 0.045 | ||
It is worth noting that in actual production, due to factors such as process control and impurity content, the actual density of the light rail may fluctuate slightly, but this fluctuation is usually within the allowable error range and will not have a significant impact on the overall performance and use of the light rail. In general, the density of the GB 8KG light rail is one of the key factors affecting its performance and application, and is deeply related to the various characteristics of the light rail and the actual application scenarios.