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Steel plates for building structures

Structural steel plates are specialized steel plates used in construction projects to bear loads, transmit forces, or resist external forces (such as earthquakes and wind loads). They are the core material of building structures such as frames, trusses, shear walls, and long-span roofs. Unlike ordinary steel plates, their performance indicators (such as strength, toughness, and weldability) are specifically designed to fully meet the mechanical requirements and construction characteristics of building structures, thereby ensuring the overall safety, stability, and durability of the building.

Classification :

Thick steel plate

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E-mail : lily@iron-element.com

PRODUCT DETAILS

Product introduction

Core features

1. Mechanical performance adaptability: Able to withstand permanent loads (such as deadweight and equipment weight), variable loads (such as crowds, wind and snow), and accidental loads (such as earthquakes and impacts) of the building structure, with sufficient strength, stiffness, and ductility to avoid brittle failure.

2. Construction process adaptability: Easy to perform on-site cutting, welding, drilling, and other processes, with stable performance after welding (no cracking or strength loss), meeting the connection requirements of complex building structure nodes.

Classification

Classification	Specific category	Grade	Applicable scenarios
Strength level	Ordinary strength structural steel	Q235GJ	Low-rise building frames, enclosure structure supports, small steel components (such as canopy frames)
	Medium and high strength structural steel	Q345GJ（旧称 Q345）、Q355GJ	Multi-story/high-rise building frame beams, columns, shear wall steel frames, and large-span roof beams
	High-strength structural steel	Q420GJ、Q460GJ、Q500GJ	Core steel frames of super high-rise buildings, long-span bridges (building accessories), and heavy-duty factory building steel columns
Special properties	Weathering structural steel	Q235NH、Q355NH	Outdoor open-air structures (such as stadium stands, outdoor corridor steel frames), coastal buildings (resistant to sea breeze corrosion)
	Z-direction performance structural steel	Q355GJ-Z15、Q345GJ-Z35	Thick steel plate components (such as steel column joints and long-span truss nodes) need to resist Z-direction tension
	Low temperature toughness structural steel	Q355GJ-C/D/E	Buildings in extremely cold regions (such as Northeast China and Inner Mongolia) must maintain -40°C impact toughness (E grade)

key performance

Performance category	Core indicators	Functions and requirements
Strength properties	Yield strength (ReH), tensile strength (Rm)	- Yield strength: The critical stress at which a steel plate begins to plastically deform, determining the upper limit of the structure's load-bearing capacity. - Tensile strength: The maximum stress before a steel plate breaks. This stress must maintain a reasonable ratio to the yield strength to maintain ductility. - For example, the common Q355 steel plate has a yield strength of ≥355 MPa and is suitable for multi-story/high-rise frame structures.
Toughness properties	Impact energy (Akv), low temperature impact toughness	- The key to resisting brittle fracture, especially in low-temperature or seismic regions, is ensuring that the steel plate deforms rather than breaks under impact. - Requirements: Impact testing is typically conducted at -20°C/-40°C, with an impact energy ≥ 34J (depending on the design grade).
Welding performance	Carbon equivalent (Ceq), cold crack sensitivity index (Pcm)	- Welding is the primary method of connecting building structures. Low Ceq (≤0.45%) and Pcm (≤0.25%) reduce the risk of cracking during welding and allow construction without complex preheating. - Avoid structural "weak points" caused by welding defects.
Molding performance	Elongation (A), cold bending performance	- Elongation: This test reflects the steel plate's plasticity, ensuring it can absorb energy through deformation when subjected to stress (e.g., earthquakes). An elongation of 20% or higher is typically required. - Cold Bending: This test verifies whether the steel plate cracks after cold bending, ensuring its suitability for curved structures (e.g., domes and curved beams).
Durability	Weather resistance (optional), lamellar tear resistance (Z-direction performance)	- Weather Resistance: For outdoor or corrosive environments (such as coastal buildings), elements such as Cu, P, and Cr are added to form a dense oxide film, reducing rust. - Z-Direction Performance (e.g., Z15/Z25/Z35): For thick steel plates (≥40mm), this material prevents tearing along the thickness direction (Z-direction) when subjected to tension, making it suitable for long-span steel trusses and columns.

Application areas

The application of building structural steel plates covers almost all core parts of "steel structure buildings" or "steel-concrete hybrid structure buildings", including:

1. High-rise/super-high-rise buildings: The core steel frame, frame columns (such as the steel plate skeleton in "steel-concrete columns"), and frame beams bear the building's vertical loads and horizontal wind/seismic loads.

2. Large-span public buildings: Roof steel trusses/grids in stadiums (such as the main truss of the Bird's Nest), convention and exhibition centers, and airport terminals. Thick steel plates or Z-direction steel plates are used for large-span load-bearing components.

3. Heavy Industrial Plants: Steel columns and crane beams in steelmaking plants and heavy machinery buildings must support the weight of heavy equipment and the moving loads of cranes.

4. Specialty Buildings: Bridges (pedestrian bridges and landscape bridges attached to buildings), storage silos (such as steel silo sidings in cement plants and power plants), and seismic retrofit projects (such as adding steel supports to existing buildings).

5. Modular Buildings: The frame panels of prefabricated steel structural modules must balance strength and ease of fabrication to allow for factory prefabrication and on-site assembly.

Company Strength

We strictly inspect the quality,our products are reasonably priced , we have stable supply，fast deliver and responsible after-sale service, so our products and service are widelv praised ov our cusomer.