High quality type steel common steel number and imported steel number refers to
High quality type steel is also known as bridge steel, which is a kind of low alloy structural steel with carbon content of 0.10-0.25%. It is called high quality because its welding performance and fatigue strength are much better than ordinary steel. High quality type steel is widely used in the construction of bridges, ships and vehicles, and is the most important type of steel in the steel structure that supports the highway and railway.
In order to distinguish different types of steel, a steel number is usually assigned to represent the percentage composition of the steel. Steel numbers are usually designated by one to four characters, AISI/SAE steel marks (American Iron and Steel Institute/Society of Automotive Engineers) are generally used in some special areas and construction steel marks are generally used. Common high quality type steel grades are represented by both American Iron and Steel Institute/Society of Automotive Engineers and domestic hot rolled structural steel grades.
In addition, imported steel numbers are different from domestic steel numbers, and the imported steel numbers are determined according to the corresponding countries steel codes. At the same time, imported steel grades may also use the American Iron and Steel Institute/Society of Automotive Engineers steel marks guide to represent the chemical composition and properties of steel.
The following table is a comparison of high quality type steel common steel number and imported steel number.
High Quality Type Steel Common Steel Number and Imported Steel Number Table
Common Steel Number
A715 Gr.50/A715 Gr.50W
AASHTO M270 Gr.50/AASHTO M270 Gr.50W
ASTM A709 Gr.50/ASTM A709 Gr.50W
Q345B
Imported Steel Number
BS 4360 Gr. 50D/BS 4360 Gr. 50DD
EN 10025-2 S355JO/EN 10025-2 S355JOW
JIS G3106 SM490/JIS G3106 SM490W
DIN17100 ST52-3/DIN17100 ST52-3W
These are some of the most common high quality type steel and imported steel numbers. By understanding the steel numbers, you can know the actual composition and performance of the steel, and thereby judge the quality of the steel and the suitability of the product for certain applications.
