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Help CenterFlat Steel & Flat Bar，Q235B: Carbon Flat Steel、Q355B: Alloy Flat Steel、65Mn: Spring Flat Steel
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1. Product Introduction
Flat steel is a long strip steel with a solid rectangular cross-section, featuring flat surfaces, standard edges, and uniform section. It is one of the most widely used basic steel materials in construction, machinery manufacturing, hardware, electric power and general industries. It can be used directly as finished parts or processed through welding, bending, drilling and precision machining.
2. Executive Standards
GB/T704 Hot-rolled flat steel standardGB/T905 Cold-drawn flat steel standardGB/T700 Carbon structural steelGB/T1591 Low-alloy structural steelGB/T13912 Hot-dip galvanizing standard
3. Product Classification
3.1 By Production Process
Hot-rolled Flat SteelHigh cost performance, good toughness, stable structure. Widely used for structural frames, supports, welding parts and embedded components.
Cold-drawn Flat SteelHigh dimensional accuracy, smooth bright surface, straightness and tight tolerance. Suitable for precision machinery and high-precision fittings.
Forged Flat SteelDense internal structure, high strength and strong impact resistance. Applied for heavy industry equipment, wear-resistant parts and high-load components.
3.2 By Material Grade
Q235B Carbon SteelGeneral-purpose grade with excellent weldability and easy processing, widely used for most conventional applications.
Q355B Low-alloy SteelHigher strength and better load-bearing performance, ideal for steel structures and engineering machinery.
65Mn Spring SteelGood elasticity, wear resistance and fatigue resistance, used for springs, blades and shock-absorbing parts.
3.3 By Surface Treatment
Black Flat Steel (Original Surface)No surface treatment, suitable for internal structures and secondary processing.
Hot-dip Galvanized Flat SteelExcellent anti-corrosion performance with strong zinc layer adhesion. Used for lightning protection, grounding systems, outdoor projects and pipe supports.
Polished / Pickled Flat SteelSmooth and clean surface for decoration and precision equipment applications.
4. Common Specifications
Thickness: 3mm – 60mmWidth: 12mm – 300mmStandard length: 6 meters per piece (custom cutting available)
All dimensional tolerances, flatness and straightness comply with national standard requirements.
5. Product Features
Uniform section thickness, flat surface, no warping, cracks or internal delamination.
Excellent welding performance, no cracking during bending and no edge collapsing during drilling.
Stable mechanical strength, good toughness and reliable load-bearing capacity.
Clean surface with less oxide scale, suitable for painting, galvanizing and further processing.
Complete size range, support custom length cutting and special-shaped processing.
6. Main Applications
Construction engineering: steel embedded parts, brackets, reinforcement components
Electric power engineering: grounding flat steel, lightning protection steel, bridge accessories
Machinery manufacturing: equipment base, frame plates, wear-resistant parts
Hardware processing: bent parts, hanging parts, supports and fasteners
Municipal engineering: guardrails, steel frames and outdoor anti-corrosion structures
7. Quality Standard
All materials meet national standards with factory test certificates available.
No surface peeling, cracks, delamination or obvious scratches.
Dimensional tolerance, straightness and flatness fully comply with GB standards.
Galvanized layers are uniform, non-leaking, non-peeling with long anti-corrosion service life.
8. Processing Services
Custom services include: fixed-size cutting, bending, drilling, sandblasting, painting, hot-dip galvanizing, polishing and precision machining.
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