Introduction of A709MGr50 steel plate grade
A709MGr36, A709MGr50, A709MGr50W, A709MGr70W belong to the American standard bridge plate, implement ASTM A572/A572M standard, bridge steel Introduction: Bridge steel is a steel plate specially used to erect railway or highway bridges. It is required to have high strength, toughness and bear the load and impact of rolling stock, and to have good fatigue resistance, certain low-temperature toughness and atmospheric corrosion resistance.
| Chemical composition |
| Tabulation: Depu Steel Date: 2024-01-18 |
| C |
Si |
Mn |
P |
S |
Nb |
| ≤0.20 |
≤0.40 |
≤1.50 |
≤0.04 |
≤0.05 |
0.005~0.05 |
Note:
(1): In order to improve the properties of steel, other trace alloying elements other than those in the above table can be added; This value is only for WSD690D≤80mm; The data comes from the network and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate shall comply with the provisions of
GB/T222 A709MGr36, A709MGr50, A709MGr50W, A709MGr70W Bridge plate composition characteristics:
1
. The carbon content is required not to exceed 0.2%
23. Add niobium, titanium or vanadium and other auxiliary elements: a small amount of niobium, titanium or vanadium forms fine carbides or carbon ammonies in steel, which is conducive to obtaining fine ferrite grains and improving the strength and toughness of steel. In addition, the addition of a small amount of copper (≤0.4%) and phosphorus (about 0.1%) can improve corrosion resistance. Adding a small amount of rare earth elements can desulfurize and degasse, purify the steel, and improve the toughness and process performance.
