The Q345B steel specification refers to the technical requirements set forth for the Chinese standard GB/T 1591-2008, which covers the low alloy high-strength structural steel plate with a yield strength of 345 MPa. Here are some key aspects of the Q345B steel specification:
Chemical Composition: The chemical composition of Q345B steel typically includes elements such as carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), and trace amounts of other elements.
Mechanical Properties: Q345B steel has specified minimum yield strength of 345 MPa (or approximately 50,000 psi) and minimum tensile strength of 470-630 MPa (or approximately 68,000-92,000 psi). It exhibits good weldability, impact resistance, and fatigue strength.
Dimensional Tolerance: The Q345B steel specification provides specific dimensional tolerance requirements for thickness, width, length, and other dimensions of the steel plates or profiles.
Steel Plates and Profiles: Q345B steel is commonly used in the manufacturing of various steel plates, sheets, and profiles, including hot-rolled steel coils/sheets, cold-rolled steel coils/sheets, and welded Steel pipes.
Applications: Q345B steel is widely used in various structural applications, including construction, bridges, offshore structures, machinery frames, and general fabrication. Its high-strength characteristics make it suitable for demanding environments and load-bearing structures.
The Q345B steel specification is specific to China and may not have an exact equivalent in other international standards. Therefore, it's necessary to consider the specific requirements and standards of the country or industry when using Q345B steel for a particular application.
What is Q345B material equivalent to?
Q345B material is a low alloy structural steel widely used in China. It is equivalent to the ASTM A572 Gr 50 standard in the United States. The closest international equivalent to Q345B is S355J2-steel_4448.html target=_blank class=infotextkey>S355JR, which is a European standard EN 10025-2. Both Q345B and S355JR have similar chemical composition and mechanical properties, making them suitable for a range of applications in construction, engineering, and manufacturing industries. However, it's important to note that while these materials are considered equivalent, there may be slight differences in specific requirements and standards between different countries or regions.
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