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Help CenterFlat Steel & Flat Steel Bar，Q195、Q235B、Q355B、 45#、SS400、SAE1006、A36
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Flat steel, also known as flat iron, is a hot-rolled or cold-rolled solid long steel material with a rectangular cross-section, flat four sides and uniform thickness. It is a highly versatile basic profile widely used in steel structure engineering. Our factory mainly supplies three core products: hot rolled flat steel, galvanized flat steel, and cold rolled flat steel. Featuring precise dimensions, flat surface, high straightness and no distortion, our products can be directly processed through cutting, bending, welding and punching. They are widely applied in building steel structures, mechanical manufacturing, embedded curtain wall parts, hardware processing, power engineering and other fields with sufficient stock, complete specifications and stable supply.
1. Core Material Grades
All flat steel products adopt national standard high-quality raw materials with high purity and low impurity content, ensuring stable mechanical properties. They meet the acceptance standards of civil construction, industrial equipment, foreign trade export and other projects. The mainstream material grades are as follows:
Q195: Features high toughness, strong plasticity and excellent bendability with high cost performance. It is widely used for general welding, bracket manufacturing, simple steel structures and daily hardware accessories, serving as the mainstream material for general-purpose hot rolled flat steel.
Q235B: The most common plain carbon steel on the market with balanced strength, toughness and weldability, as well as excellent cold and hot processing performance. It is suitable for most construction projects, steel structure brackets, embedded components and equipment bases, and acts as the primary base material for engineering-grade cold rolled flat steel and galvanized flat steel.
Q355B: A low-alloy high-strength steel grade with significantly better tensile, compressive and impact resistance than Q235. It is applicable for heavy-load steel structures, load-bearing equipment brackets, bridge auxiliary structures, large mechanical accessories and other high-strength working conditions.
45# Carbon Steel: Possesses high strength, high hardness and good wear resistance, with further improved performance after quenching and tempering treatment. It is commonly used for precision mechanical parts, mold processing, high-strength transmission components and industrial precision processed parts.
Export Special Grades: SS400, SAE1006, A36 and other international standard materials, fully compliant with European, American and Southeast Asian standards, specially customized for overseas export orders.
2. Product Classification and Process Characteristics
2.1 Hot Rolled Flat Steel
Hot rolled flat steel is integrally formed through high-temperature hot rolling technology with high production efficiency and high yield rate. It features flat surface, uniform thickness, excellent toughness and superior weldability. The product is crack-resistant and can be directly processed by bending, punching, cutting and welding without secondary finishing. With strong bearing capacity and outstanding cost performance, it is the preferred basic profile for steel structure construction, factory building erection, bracket processing, embedded parts and fence manufacturing.
2.2 Cold Rolled Flat Steel
Cold rolled flat steel is manufactured from hot-rolled base materials through room-temperature precision rolling, straightening and finishing. It features ultra-small dimensional tolerance, high surface finish, excellent straightness and neat burr-free edges. Compared with hot-rolled products, it has higher precision and better appearance, making it suitable for scenarios with strict requirements on size and appearance, such as precision mechanical parts, high-end hardware, precision brackets, equipment decoration and precision welded components.
2.3 Galvanized Flat Steel
Galvanized flat steel is produced by applying hot-dip galvanizing or electro-galvanizing surface treatment on high-quality Q235B flat steel base. The uniform and firm zinc layer effectively isolates air, moisture and acid-base corrosion, providing long-term rust prevention, anti-corrosion and weather resistance. With a bright and aesthetic surface, it requires no additional painting or anti-rust treatment. It is suitable for outdoor open-air, humid, coastal and chemical corrosive environments, and widely used in power grounding, curtain wall embedding, outdoor steel structures, municipal guardrails and water conservancy anti-corrosion projects.
3. Executive Standards
Domestic Standards: GB/T 700-2006, GB/T 1591-2018, GB/T 13796-2008
Galvanizing Standard: GB/T 13912-2002 Metallic Coatings - Hot-Dip Galvanized Coatings on Steel
International Standards: ASTM A36, JIS G3101, SS400, etc. Fully compliant with overseas project acceptance and foreign trade export requirements. Complete material certificates, factory inspection reports and quality documents can be provided.
4. Specification Parameters
Thickness Range: 2mm – 60mm
Width Range: 12mm – 200mm
Standard Length: 6m, 9m, 12m. Custom lengths from 3m to 15m, random cutting and special-shaped processing are available.
Regular Stock Sizes: 20*3, 25*3, 30*3, 30*4, 40*4, 40*5, 50*5, 50*6, 60*6, 80*6, 100*8 and other commonly used engineering dimensions with complete specifications and sufficient inventory.
Surface Quality: Smooth and flat surface without cracks, scars, folds, rust or distortion; straight edges with strictly controlled dimensional tolerance and qualified flatness and straightness, supporting direct deep processing.
5. Mechanical Properties
Q195: Yield strength ≥195MPa, Tensile strength: 315–430MPa, excellent toughness and easy bending performance
Q235B: Yield strength ≥235MPa, Tensile strength: 370–500MPa, balanced plasticity, toughness and weldability
Q355B: Yield strength ≥355MPa, Tensile strength: 470–630MPa, high load-bearing capacity, strong impact resistance and deformation resistance
45# Carbon Steel: Tensile strength ≥600MPa, high hardness, wear resistance and tensile resistance, suitable for high-precision and high-strength processing scenarios
Galvanized flat steel completely retains the mechanical properties of the base steel. The zinc layer only provides anti-corrosion protection without affecting structural strength and processing performance.
6. Main Application Fields
1. Building Steel Structure: Factory steel frames, steel structure brackets, beam and column reinforcement, wall tie members, roof supports and embedded connecting parts. Hot rolled flat steel serves as the core basic material.
2. Power Engineering: Grounding flat steel, lightning protection grounding, substation frames and power brackets. Galvanized flat steel is the preferred material for outdoor anti-corrosion scenarios.
3. Mechanical Manufacturing: Equipment bases, mechanical brackets, transmission parts and precision hardware components. Cold rolled flat steel is widely used for high-precision structural parts.
4. Municipal and Curtain Wall Engineering: Building curtain wall embedding, guardrail processing, road steel structures, landscape engineering and outdoor decorative components.
5. Water Conservancy and Chemical Industry: River protection, water conservancy equipment, chemical anti-corrosion brackets and coastal corrosion-resistant steel structures with excellent rust and corrosion resistance.
6. Hardware Processing: Shelves, fences, door and window accessories, metal products and non-standard customized steel structures.
7. Core Product Advantages
1. Complete Product Range: We supply hot rolled flat steel, cold rolled flat steel and galvanized flat steel with multiple materials and full specifications to meet one-stop procurement demands of various projects.
2. Precise Dimensions: Flat surface, high straightness, small tolerance, no burrs and no distortion, effectively reducing secondary processing costs and improving construction efficiency.
3. Stable Performance: Adopting qualified steel billets from regular manufacturers, the products have excellent welding, bending and punching performance without cracking or deformation, ensuring high engineering safety.
4. Corrosion Resistance and Durability: Galvanized flat steel features thick and uniform zinc layer with strong resistance to wind, rain, moisture and acid-base erosion, greatly extending outdoor service life and eliminating later maintenance costs.
5. Stable Supply: Sufficient spot inventory, supporting deep processing such as custom cutting, bending, punching and sandblasting. Stable delivery for both small and bulk orders with high cost performance.
8. Packaging, Transportation and Delivery Cycle
8.1 Packaging Method
Products are firmly bundled with steel strips with waterproof and rust-proof outer packaging and end protection treatment to avoid collision, rust and deformation during transportation. Suitable for long-distance land transportation and ocean shipping. Custom shipping marks and labels are available to ensure intact delivery of hot rolled flat steel, cold rolled flat steel and galvanized flat steel.
8.2 Delivery Cycle
Standard In-stock Specifications: Conventional Q235B hot rolled flat steel and regular galvanized flat steel are in sufficient stock, available for shipment within 3–5 working days after payment confirmation.
Regular Custom Processing: Custom-length cutting, random cutting, simple bending and punching processed cold rolled flat steel and conventional profiles require 5–10 working days for production and delivery.
Special Custom Products: Q355 high-strength material, 45# carbon steel, non-standard thickened and widened specifications, and high-zinc-layer customized galvanized products involve complex processes, with a delivery cycle of 10–20 working days.
Large-batch Orders: Exclusive production schedules can be negotiated, and phased shipment is supported to match project construction progress and ensure continuous material supply.
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