In actual applications, the commonly used material for GB 8KG light rail is Q235B ordinary carbon structural steel. The characteristics of this type of steel determine the performance and applicable scenarios of 8KG light rail.
The "Q" in Q235B stands for yield strength, "235" means that the yield strength of the steel is 235MPa, and "B" stands for the quality grade. The smelting process of this material is mature. During the production process, the content of elements such as carbon, manganese, and silicon is reasonably controlled to give it good comprehensive performance. It has a certain strength and can withstand the pressure and impact generated by the operation of light locomotives, meeting the use requirements of 8KG light rail in temporary transportation in forest areas and mining areas, as well as material transportation within small factories. At the same time, Q235B steel has good toughness. During the laying of light rail, it can adapt to a certain degree of bending and deformation, which is convenient for construction and installation.
| 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 | ||
From a cost perspective, Q235B steel has a wide range of raw materials, abundant reserves of raw materials such as iron ore, and a simple production process that does not require complex refining and special processing, which greatly reduces the production cost of 8KG light rail, making it more price-competitive in the market. In addition, Q235B steel has good welding performance. When laying light rail tracks, it can easily connect the sections of light rail to ensure the continuity and stability of the track, further improving its convenience in practical applications.
It is precisely because of these characteristics of Q235B ordinary carbon structural steel that it has become a common material for GB 8KG light rail, allowing 8KG light rail to be widely used in many transportation scenarios with low load requirements.