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Hot rolled H-shaped steel is one of the most popular and widely used structural steel products in todays market. It is mostly used in areas with relatively high load bearing capacity, such as buildings and bridges. The delivery status and grades of the hot rolled H-section steel are different according to different GB/T 11263-1998 standards.
The hot rolled H-section steel are delivered in one of three possible forms, including cold drawn delivery, normalizing delivery, and hot rolling delivery. The cold drawn delivery method is the delivery form of hot rolled H-section steel which has the highest level of dimensional accuracy, the lowest surface roughness, the highest strength, and the highest fatigue limit. The hot rolled delivery form is a delivery form that has a relatively high level of dimensional accuracy, but a lower strength, higher surface roughness and fatigue limit than the cold drawn delivery form. The normalizing delivery form is a delivery form which has the highest level of strength, a medium degree of dimensional accuracy and a medium surface roughness. In general, the hot rolled H-shape steel grades are divided into Q235B, Q345, Q390, Q420, SS400, SS540, etc.
Due to the composite nature of H-shape steel, the chemical composition of H-shape steel also varies according to the delivery status and grades. In general, the delivered chemical composition requirements for hot rolled H-shape steel should be based on GB/T 11263-1998.
In general, for hot rolled H-shape steel with a normalizing delivery form, the chemical composition should be the following: carbon (C) 0.22-0.27%, manganese (Mn) 0.60-0.9%, sulfur (S) 0.025%, phosphorus (P) 0.035%, silicon (Si) 0.15-0.4%, copper (Cu) 0.15-0.35%, nickel (N) 0.08%, chromium (Cr) 0.25%, aluminum (Al) 0.05%.
In general, for hot rolled H-shape steel with a hot rolled delivery form, the chemical composition should be the following: carbon (C) 0.20-0.24%, manganese (Mn) 0.60-0.9%, sulfur (S) 0.035%, phosphorus (P) 0.035%, silicon (Si) 0.15-0.3%, copper (Cu) 0.15-0.35%, nickel (N) 0.08%, chromium (Cr) 0.25%, aluminum (Al) 0.05%.
In general, for hot rolled H-shape steel with a cold drawn delivery form, the chemical composition should be the following: carbon (C) 0.18-0.24%, manganese (Mn) 0.60-0.9%, sulfur (S) 0.025%, phosphorus (P) 0.035%, silicon (Si) 0.15-0.3%, copper (Cu) 0.15-0.35%, nickel (N) 0.08%, chromium (Cr) 0.25%, aluminum (Al) 0.05%.
In conclusion, the delivery status and grades of hot rolled H-shaped steel vary according to the different GB/T 11263-1998 standards. The chemical composition also varies according to the delivery status and grades. It is always important to ensure that the grades and chemical composition meet the technical standards before delivering hot rolled H-shaped steel.
