GB/T 714-2000 Bridge Structural Steel Grades and Chemical Composition
GB/T 714-2000 is a standard that specifies the bridge structural steel grades and chemical compositions which are made in accordance with the welding requirements of GB/T 10045-1996.
GB/T 714-2000 bridge structural steel is a low-alloy steel series with the content of Mn, Si and COf the same level. It is mainly used in bridges and other large-scale steel structures. The steel has a specific and unique performance.
The classification of GB/T 714-2000 bridge structural steel can be divided into four levels: A, B, C, and D. All of the steel grades must be in accordance with the prescribed chemical composition. For example, steel grade A is an alloy steel with a content of 0.28% C, 0.80% Mn, 0.42% Si, 0.55% Ni, 0.17% Cr, 0.009% P, 0.013% S, 0.17% V, and 0.025% Nb. As for steel grade B, the content is 0.36% C, 0.90% Mn, 0.50% Si, 0.60% Ni, 0.17% Cr, 0.010% P, 0.014% S, 0.17% V, and 0.025% Nb.
The welding technology of GB/T 714-2000 bridge structural steel is an important technology to ensure the stability and safe operation of the bridge structure engineering. The welding technology of low-alloy bridge steel can be divided into conventional welding and modern welding technology. Conventional welding is a mature welding technology which is mainly used in the welding of low-alloy steel. Modern welding technology is a welding technology developed in recent years, its welding effect is much better than conventional welding technology.
It should be noted that when performing GB/T 714-2000 bridge structural steel welding, it is necessary to choose the corresponding welding materials and welding technology according to the requirements of the design, the working conditions and the properties of the steel. In addition, when carrying out welding work, the protective measures must be taken, and the welding process should be rigorous.
GB/T 714-2000 bridge structural steel is widely used in the construction of bridges, large-scale steel structure engineering, power station construction and other fields. The selection and weldingof this type of steel is technically demanding. By understanding the classification and welding technology of GB/T 714-2000 bridge structural steel, it can lay a solid foundation for correctly selecting and correctly welding this type of steel according to the engineering needs and thus guarantee the safe and stable operation of the bridge.
