Wholesale hot rolled steel sheet in coil has excellent mechanical properties, including high tensile strength, good toughness, and excellent weldability. They also possess outstanding physical characteristics, including high hardness, good ductility, and good corrosion resistance.
What Are the Mechanical Properties of Wholesale Hot Rolled Steel Sheet in Coil?
Wholesale hot rolled steel sheet in coil is generally used in applications requiring good forming properties, such as automotive parts, appliances, and furniture. Overall, the mechanical properties of wholesale hot rolled steel sheet in coil is not as high as specialized steels, but they is suitable for a wide range of applications.
Tensile Strength: 270-430 MPa
Yield Strength: 185-265 MPa
Elongation: 26%-34% (thickness less than 3mm)
Modulus of Elasticity: 160-200 GPa
Shear Modulus: 80-110 GPa
What Is the Chemical Composition of Wholesale Hot Rolled Steel Sheet in Coil?
Wholesale hot rolled steel sheet in coil is made from hot rolled sheets that have been pickled to remove residues. The hot rolled sheets are then quenched to reduce material thickness. The material is then aged to increase the toughness of the steel. There are many different types of wholesale hot rolled steel sheet in coil, ranging from JIS G 3131-1996 to JIS G 3131-2000.
Its chemical composition includes
Carbon (C): less than 0.15%
Silicon (Si): less than 0.05%
Manganese (Mn): less than 0.60%
Phosphorus (P): less than 0.035%
Sulfur (S): less than 0.035%
Aluminum (Al): more than 0.010%
These are the main chemical components of wholesale hot rolled steel sheet in coil. The content of SPHC elements produced by different manufacturers may vary slightly, but they all fall within this range.
How Are Wholesale Hot Rolled Steel Sheet in Coil Produced?
The production process of SPHC hot rolled steel strips is as follows:
Blast Furnace Hot Metal ≥ Desulfurization ≥ 120t Top and Bottom Continuous Converter ≥ LF Refining Furnace≥ ASP Continuous Casting Machine ≥ Preheating Furnace ≥ Phosphorus Removal ≥ Rough Rolling ≥ Finishing ≥ Straightening ≥ Coiling ≥ Finished Product.
In the hot rolling process for melting various wholesale hot rolled steel sheet in coil, the sulfur content must be controlled to meet the requirements of various steels to meet the final requirements of the converter, ensuring that the sulfur content of the molten steel product meets the standard.
The target value of sulfur concentration is determined by the sulfur recovery rate in the desulfurization process of molten steel. Based on the initial process, the sulfur recovery rate of the converter is 0.016%. To meet the composition requirements, the sulfur target content is adjusted from the initial 0.015% to 0.010%.
To improve the utilization rate of magnesium powder, the injection speed of magnesium powder is adjusted from the initial 12 kg/minute to below 10 kg/minute to increase the residence time of molten steel, increase the dissolved amount, and improve the desulfurization efficiency of magnesium powder. To minimize the sulfur recovery rate of the converter, at least 2/3 of the molten steel amount must be removed to eliminate the contaminated slag.
After adjusting the process, the sulfur recovery rate of the converter is controlled at 0.008%. The consumption is also reduced, providing high-quality and standard-compliant molten iron for the operation of the converter, while reducing the burden of sulfur removal from the converter.
What Are the Uses of Wholesale Hot Rolled Steel Sheet in Coil?
Wholesale hot rolled steel sheet in coil has many uses. On one hand, they can be used as the base material for cold-rolled steel plates. After being cleaned to remove surface rust, they can be cold rolled and made into cold-rolled products.
In the automotive, machinery, light industry, and home appliance industries, there is a significant demand for wholesale hot rolled steel sheet in coil. For example:
In the automotive industry
They are used for automotive chassis frames, dashboards, transportation plates, seals inside some small parts, etc.
In the machinery industry, they are used in textile machinery, machinery, fans, etc.
In light industry equipment
They are used for air compressor housings, thermal linings, etc.
Wholesale hot rolled steel sheet in coil is also used to make electrical boxes, highway guardrails, iron ladders, and other components.
