The following is the product introduction of seamless steel joist, combining material properties, structural advantages and application scenarios:

Product Overview

Seamless steel joist is a high-performance space structure system made of seamless steel pipes or profiles through high-precision welding process, and its core features are no weld defects in the material, high strength of nodes and excellent overall stability. The product is widely used in large-span buildings (such as stadiums, convention and exhibition centers), industrial plants, bridge projects and large equipment support systems, and is especially suitable for engineering scenarios with stringent requirements on structural safety and durability.

I. Core Advantages

1、Excellent material performance

High-strength seamless steel pipe: adopts Q355B, Q420GJC and other high-strength steel, with tensile strength up to 450-650MPa and yield strength ≥355MPa, which can withstand extreme loads and complex stress environments.

Corrosion resistance: the surface is hot-dipped galvanized or sprayed with anti-corrosion coating (such as fluorocarbon paint), weather resistance of more than 30 years, to adapt to humidity, salt spray and other harsh environments.

Lightweight design: By optimizing the cross-section shape (such as round, rectangular or shaped pipe), it can reduce weight by 20%-30% compared with traditional H-beam steel joist, thus reducing the foundation cost.

2、Scientific structural design

Seamless node technology: Adopting coherent line cutting and robot welding technology to ensure that there is no stress concentration at the joints of rods, and the bearing capacity of nodes is increased by more than 40%.

Modular assembly: Supporting standardized prefabrication and rapid assembly on site, the span of a single joist can reach 120 meters, and the maximum overhang length can reach 30 meters, which meets the demand for complex shapes.

Seismic and wind-resistant performance: Optimize the arrangement of rods through finite element simulation, and the deformation of the structure under dynamic load is controlled within L/400, which meets the requirements of GB 50017-2017 specification.

3、Advanced manufacturing process

Intelligent processing equipment: adopting CNC pipe bender, laser cutting machine and servo punching system, the processing precision error is ≤1mm, realizing millimeter-level assembly.

Automated welding: apply submerged arc welding (SAW) and gas shielded welding (GMAW), the weld grade reaches the first class standard, and passes the dual inspection of ultrasonic flaw detection (UT) and magnetic particle testing (MT).

4、Application Scene

Large public buildings: such as gymnasiums, airport terminals, theaters, etc. Typical cases include Xiangjiang Happy City Ice World (span of 95 meters) and Shennong Grand Theater (8,000 tons of steel used).

Industrial facilities: crane girders for heavy plants, support frames for petrochemical plants, customized fireproof coatings (fire resistance limit ≥ 2 hours) to adapt to high temperature environments.

Transportation engineering: main girders of bridges, elevated platform canopies with enhanced mid-span load-bearing capacity through pre-stressing tensile technology. Transportation engineering: bridge main girders, elevated platform canopies, enhanced mid-span capacity through prestressed cable technology 30.

New energy sector: photovoltaic mounts, wind turbine towers, adapted to terrain undulation and dynamic loading needs.

Contact

Mobile number: 13848510731

Landline number: 0471-6490861

Address: Inside the courtyard of the Outer Transport Company, diagonally opposite the government of Haoqinying Town, Xincheng District, Hohhot City, Inner Mongolia (National Highway 110)