Manganese steel plate girder & high strength steel girder`s merits and demerits (II)

Merits, demerits & working conditions of modular trailer accessories: high strength steel girder

Advantages of high strength steel: high strength

The biggest feature of high-strength steel is high strength. From the above table, we can also see that the yield strength of high-strength steel is twice that of manganese steel and three times that of ordinary steel.

When manufacturing the trailer girder, it bears the same strength. The girder made of high-strength steel uses less materials, and the upper wing plate, lower wing plate and vertical plate can be thinner and lighter. Under the premise of weight charging and standard load, the advantages are obvious.

Disadvantages of high strength steel: poor toughness and difficult welding

Poor toughness: we can also see from the table that the elongation of high-strength steel is small and the toughness is poor. This is why we often hear that high-strength steel "would rather bend than bend".

Difficult welding: it is strictly forbidden to weld the high-strength steel girder without permission. The high-strength steel is easy to anneal in case of strong current, which destroys the steel structure, and the girder is easy to break after annealing. The welding of high-strength steel requires high equipment and welding technology, and it is required to master the voltage and current. The trailer factory generally adopts tens of thousands to hundreds of thousands of Yuan submerged arc welding machines and other large welding equipment for welding. In ordinary maintenance points, the equipment in the repair shop is relatively simple. If it is not handled well, the trailer girder is easy to open welding and fracture after annealing.

Suitable working conditions of high strength steel girder

The above advantages and disadvantages determine that the trailer with high-strength steel girder is best suitable for the transportation of light goods with high-speed standard load in good road conditions. It is not suitable for the transportation environment in mountainous areas, overload and poor road conditions. Overload, especially concentrated load, is strictly prohibited, and the girder shall not be welded privately.

Merits, demerits & working conditions of modular trailer accessories: manganese steel girder

Advantages of manganese steel girder: good toughness

Good toughness: compared with high-strength steel girder, manganese steel girder has the advantage of good toughness and can be restored to its original state after unloading under the condition of large deformation. The large deformation is also a reminder to the driver that the loading capacity is enough. Moreover, beyond the bearing limit, the manganese steel girder is also deformed, and there are few accidents such as high-strength steel, which directly collapse the waist of the girder.

Disadvantages of manganese steel girder: slightly poor strength

The strength is slightly poor: compared with high-strength steel, the same bearing capacity and strength require that the steel plate of manganese steel is thicker and larger, so that the girder is heavier. At present, with the popularity of heavy charging and lightweight, it is slightly at a loss.

Suitable working conditions of manganese steel girder

Compared with high-strength steel, manganese steel is more suitable for mountain area, heavy load and other working conditions. Of course, in fact, the characteristics of manganese steel are relatively balanced and suitable for many working conditions, which is also one of the reasons why manganese steel was used for girders in the past. It is just that under the premise of the popularity of weight charging and standard load, it is more suitable for working conditions such as mountainous areas and heavy load.