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Help CenterFlat Steel & Steel Flat Bar，Q235、Q355、S235JR、S355JR、A36、SS400
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Flat Steel Product Description
Flat steel, also known as flat bar, is a long strip of steel with a rectangular cross-section, featuring uniform thickness, smooth surface and excellent mechanical properties. It is a widely used section steel in industrial production and construction fields, with the advantages of easy processing, strong adaptability and high cost performance, serving as an important basic component for various structures and equipment.
1. Product Classification
By Production Process
Hot Rolled Flat Steel: Formed by hot rolling at high temperature, with high strength, complete specifications and wide application. It is the most commonly used type of flat steel, suitable for general structural purposes.
Cold Drawn Flat Steel: Formed by cold drawing of steel billets, with high dimensional accuracy, smooth surface and uniform thickness. It is suitable for precision machinery, hardware accessories and other occasions with high requirements.
Cold Rolled Flat Steel: With thinner thickness, higher precision and better surface finish, it is mainly used in light industry, electronics and decorative fields.
By Surface Treatment
Black Flat Steel (Hot Rolled): No surface treatment, original color of hot rolled steel, suitable for indoor scenes or occasions that need secondary anti-corrosion treatment (such as painting, galvanizing).
Hot-Dip Galvanized Flat Steel: Surface is coated with a layer of zinc through hot-dip process, which has excellent anti-corrosion and anti-rust performance, suitable for outdoor, humid, coastal and other harsh environments.
Pickled Flat Steel: Surface is treated by pickling to remove oxide scale, with clean surface, convenient for subsequent processing and coating.
By Material
Carbon Steel Flat Steel: The most commonly used type, including Q235, Q355, S235JR, S355JR, A36, SS400, etc., with moderate strength and good weldability.
2. Common Specifications
Thickness: 3mm - 50mm
Width: 20mm - 600mm
Length: Standard length 6m, 9m, 12m; customized length is available according to customer requirements.
3. Material & Mechanical Properties
3.1 Common Materials & Chemical Composition
Q235
Chemical Composition (%): C ≤ 0.22, Si ≤ 0.35, Mn 0.30-0.70, P ≤ 0.045, S ≤ 0.045
Application: General construction,shelves, and other non-heavy load structures.
Q355 (formerly Q345)
Chemical Composition (%): C ≤ 0.24, Si ≤ 0.55, Mn 1.00-1.60, P ≤ 0.035, S ≤ 0.035, Nb+V+Ti 0.02-0.15
Application: Heavy-duty structures, bridges, power towers, and other occasions requiring high strength.
3.2 Mechanical Properties
Q235: Yield Strength ≥ 235 MPa, Tensile Strength 370-500 MPa, Elongation ≥ 26%, Impact Energy ≥ 27J (20℃)
Q355: Yield Strength ≥ 355 MPa, Tensile Strength 470-630 MPa, Elongation ≥ 21%, Impact Energy ≥ 34J (20℃)
4. Product Features
Excellent Mechanical Performance: Good tensile, bending and shear strength, stable structure, not easy to deform, and can bear certain loads.
Easy Processing: Convenient for cutting, welding, drilling, bending and other processing operations, which can be quickly adapted to various construction and production needs.
Complete Specifications: A variety of thicknesses, widths and lengths are available, and customized specifications can be provided to meet different usage scenarios.
High Cost Performance: Reasonable price, high material utilization rate, and cost-saving for large-scale use.
Strong Corrosion Resistance: Galvanized and stainless steel flat steel can adapt to harsh environments such as humidity and corrosion, with long service life.
5. Applications
Construction Industry: Used as building brackets, floor slabs, stair treads, curtain wall keels, guardrails, and auxiliary components of steel structures.
Power & Communication: Used in power transmission towers, communication base stations, cable trays, bus brackets, etc.
Mechanical Manufacturing: Used as equipment bases, frames, reinforcing ribs, connecting parts, and hardware accessories.
Warehousing & Logistics: Used in warehouse shelves, platforms, pallets, and fence structures.
Municipal Engineering: Used in road guardrails, billboard brackets, drainage facilities, and urban greening brackets.
Other Fields: Chemical equipment, shipbuilding, automobile manufacturing, and decorative engineering.
6. Execution Standard & Delivery Information
Execution Standard: GB/T 702-2016 (Hot Rolled Steel Strip and Flat Steel); GB/T 3078-2017 (Cold Drawn Steel Bars)
Delivery Condition: Hot rolled (black), hot-dip galvanized, pickled, etc.
Packing: Bundled packing with steel strips, suitable for ocean transportation and land transportation, preventing damage during transportation.
Delivery Time: 5-7 days for regular stock products; delivery time for customized specifications or galvanized products will be negotiated separately.
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