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Help CenterFlat Steel & Flat Steel Bar,Q355B/Q355D、20#、45#、40Cr、42CrMo、Q235B
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1. Product Overview
Flat steel (commonly known as flat iron) is a long strip of section steel with a standard rectangular cross-section and passivated rounded edges. As a general basic profile steel, it features a width of 12–300 mm, a thickness of 3–60 mm, and a width-thickness ratio of no less than 3 mm. With smooth and burr-free side edges, it can be used directly as a finished product or applied as the raw material for welded pipes and thin plate rolling. It is widely used in construction, electric power, machinery, municipal engineering, new energy and other industrial fields.
Basic Parameters
1. Specification Identification: Width × Thickness (unit: mm), e.g. 50×6, 100×10
2. Standard Length: 6m, 9m, 12m; custom cutting of any length is supported
3. Theoretical Weight Formula: Weight(kg/m) = Width(mm) × Thickness(mm) × 0.00785
4. Executive National Standards:
- Hot-rolled flat steel: GB/T 704-2016
- Cold-drawn precision flat steel: YB/T 037-1993
- Carbon structural steel: GB/T 700-2006; High-strength low-alloy steel: GB/T 1591-2018
2. Product Classification
2.1 Classification by Production Process
2.1.1 Hot-rolled Flat Steel (Mainstream Product)
Process: Formed by high-temperature rolling at 1000–1250℃ followed by air cooling and shearing.
Appearance: With oxidized black surface, moderate flatness and standard tolerance.
Performance: Excellent plasticity, toughness and weldability with low cost.
Application: Steel structure construction, electric power grounding, guardrails, supports and general mechanical components.
2.1.2 Cold-drawn / Cold-rolled Precision Flat Steel
Process: Cold precision drawing and rolling at room temperature with pickling to remove oxide scale.
Appearance: Smooth and oxide-free surface, high straightness, ultra-small dimensional tolerance (±0.02~±0.1mm).
Performance: Work-hardened with higher hardness and high dimensional accuracy for precise assembly.
Application: Precision equipment, mold accessories, automated frames and high-precision hardware parts.
2.1.3 Forged Flat Steel
Process: High-temperature forging forming with dense internal structure without porosity or looseness.
Performance: High strength and strong impact resistance, specially designed for heavy-load thick specifications.
Application: Heavy machinery bases, marine components and load-bearing parts of construction machinery.
2.2 Classification by Material
2.2.1 Ordinary Carbon Flat Steel
Q235B: Universal grade with good weldability and bendability, the first choice for construction, electric power and guardrail projects.
Q195: Soft material with excellent bending and stamping performance, suitable for small hardware parts.
2.2.2 High-strength Low-alloy Flat Steel
Q355B/Q355D: High tensile strength, specially used for load-bearing structures, bridges and lifting equipment with higher bearing capacity than ordinary carbon steel.
2.2.3 High-quality Carbon & Alloy Structural Flat Steel
20#, 45#, 40Cr, 42CrMo: Uniform material texture with outstanding strength and wear resistance, widely used for tempered gears, shaft parts, mechanical wear-resistant components and heavy-duty mechanical accessories.
2.2.4 Spring Flat Steel
65Mn, 60Si2Mn: Excellent elasticity and fatigue resistance with low deformation rate, applied to automobile leaf springs, shock-absorbing parts and elastic mechanical components.
2.3 Classification by Surface Treatment
1. Black Flat Steel: Original hot-rolled surface with the lowest cost, suitable for indoor internal structural parts and non-exposed load-bearing components.
2. Hot-dip Galvanized Flat Steel: Zinc layer ≥85μm with superior anti-rust and anti-corrosion performance, adaptable to harsh outdoor environments, widely used in grounding projects, photovoltaic supports, road guardrails and municipal steel structures.
3. Electro-galvanized Flat Steel: Thin zinc layer of 5–15μm with smooth and bright appearance and moderate anti-rust performance, suitable for indoor distribution cabinets, decorative supports and small hardware accessories.
3. Core Product Advantages
1. High Material Utilization: Manufactured by negative tolerance rolling, the effective material utilization rate is 1%–5% higher than steel plates of the same weight, reducing cutting waste and material costs.
2. Convenient Processing: Standard rectangular cross-section supports bending, drilling, welding, cutting and stamping without secondary plate cutting, adapting to various mechanical processing and steel structure construction.
3. Flexible Customization: Custom cutting by fixed width, thickness and length is available to meet personalized engineering requirements, eliminating customers’ blanking processes and saving labor and construction period costs.
4. Stable Structure: Flat surface and vertical side edges ensure firm splicing and bolt connection with consistent load-bearing performance and high assembly accuracy of steel structures.
5. Wide Versatility: Applicable to multiple industries including construction, electric power, machinery, automobile, shipbuilding and new energy. Sufficient stock of conventional specifications ensures fast capital turnover and stable supply.
4. Mainstream Specification Reference (Width × Thickness, mm)
- Narrow Series: 12×3, 16×4, 20×5, 25×6, 30×8
- Medium Series: 40×6, 50×8, 60×10, 80×12, 100×10
- Wide Series: 120×14, 150×16, 200×20, 250×30, 300×50
5. Application Fields
1. Building Steel Structure: Factory purlins, stair treads, supports, curtain wall keels, bridge reinforcement parts and steel structure embedded parts.
2. Electric Power Lightning Protection & Grounding: Hot-dip galvanized flat steel for grounding main lines, tower grounding bars and substation grounding components.
3. Mechanical Manufacturing: Equipment bases, racks, fixtures, cutting tools, conveying accessories and precision mechanical processing parts.
4. Traffic & Municipal Engineering: Road guardrails, bridge embedded parts, truck frames, forklift accessories and municipal engineering steel structures.
5. New Energy Industry: Photovoltaic supports, wind power equipment fixing parts and new energy power station grounding components.
6. Hardware Tools: Wrenches, fixtures, stamping blanks, iron art decorations and various hardware stamping forming parts.
6. Packaging, Delivery & After-sales Service
1. Packaging: Hot-rolled black flat steel is firmly bundled with steel strips; galvanized flat steel is wrapped with waterproof woven cloth and equipped with end protective covers to prevent collision damage and zinc layer peeling during transportation.
2. Delivery Cycle: 5–7 days for in-stock conventional products.
3. Logistics Service: Full truck load, less-than-truckload and container shipping are available, supporting domestic nationwide transportation and foreign trade export.
4. Quality Assurance: Material quality certificates are provided for each batch of products. Test reports of tensile strength, yield strength and chemical composition are available. All products are fully inspected in dimension and appearance before delivery.
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