What are the yield strength and tensile strength ranges of Q355 steel plate?
A: Yield strength Rel≥355MPa (thickness≤16mm). For each increase in thickness, the yield strength slightly decreases (e.g., 16-40mm≥345MPa); Tensile strength Rm=470-630MPa.
What are the core requirements for the chemical composition of Q355 steel plate?
A: National standard basic requirements (wt%): C≤0.20, Si≤0.55, Mn≤1.60, P≤0.035, S≤0.035; Alloying elements can be micro-alloyed (Nb/V/Ti), with a total content ≤0.22%.
What are the differences in impact test requirements for different quality grades (A-E) of Q355 steel?
A: Grade A has no impact test requirement; Grade B requires an impact energy ≥34J at room temperature (20℃); Grade C requires ≥34J at 0℃; Grade D requires ≥34J at -20℃; Grade E requires ≥34J at -40℃. All samples have a V-notch.
What is the delivery condition of Q355 steel plate?
A: The default delivery condition is hot-rolled (HR). Controlled rolling and normalized conditions can also be provided upon request. The surface finish is hot-rolled pickled, black skin, or sandblasted to remove rust.
What is the hardness range of Q355 steel plate?
A: The Brinell hardness of hot-rolled steel is HB≤210, and that of normalized steel is HB≤200. When there is no specific hardness requirement, yield/tensile strength is the core acceptance indicator.