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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.
PRODUCTS CENTER
Product Description
W-shaped steel is mainly classified into two types based on different application scenarios and structural features: W-shaped steel strips for mine support and wide flange steel (W-shaped) for American standard building structures. The following is the specific analysis:
1. W-shaped steel belts for mine support
Definition and structural features
- The cross-section is in the shape of the letter "W", formed by cold-bending and rolling thin steel plates (with a thickness of 2.5-3.0mm), and the material is mostly Q235 steel.
- The core function is to connect the scattered anchor rods into a whole through the W-shaped structure, forming a support grid structure with coordinated load-bearing.
Core purpose
- It is mainly used for support in underground coal mine roadways, cutting holes in working faces, and chambers, especially suitable for reinforcing broken roof slabs or unstable rock strata.
- It can be extended to projects such as landslide control and embankment reinforcement.
Technical advantage
- High strength and deformation resistance: The cold-rolling hardening process increases the tensile strength by 12% to 15%, and the flexural section modulus is 37 times higher than that of flat steel strips.
- High-stiffness support: Stiffness is increased by approximately 70 times, effectively controlling the deformation of surrounding rock.
- Economy: High section utilization rate, saving over 30% of steel and reducing support costs.
Limitations
Thin-walled designs are prone to being punctured or torn by anchor bolt support plates under extremely high tunnel pressure.
II. Wide Flange Steel (W-type) for American Standard Building Structure
Definitions and Standards
- It complies with the American ASTM standard (such as A36/A572) and is a Wide Flange H-shaped steel. The code "W" stands for "Wide flange".
- Model naming rule: W height × weight (for example, W14×90 indicates a height of 14 inches and a weight of 90 pounds per foot).
Core purpose
- Large-span load-bearing structures such as beams and columns of high-rise buildings, frames of industrial plants, main beams of Bridges, and supports for heavy equipment.
Performance characteristics
- High load-bearing capacity: The yield strength of low alloy steel material (such as A572 Gr.50) is ≥345MPa.
- Bending stability: The wide flange design increases the moment of inertia of the cross-section, providing excellent compressive and bending resistance performance.
- Construction convenience: Standardized dimensions are compatible with welding/bolt connections, and the surface can be galvanized for anti-corrosion.
Typical specification examples
| Model | Height (mm) | Wing Width (mm) | Web thickness (mm) | Single weight (kg/m) |
| W14×90 | 356 | 254 | 11.2 | 134 |
| W8×24 | 203 | 165 | 7.2 | 35.9 |
III. Core Differences between the Two Types of W-shaped Steel
| Comparison Dimension | W-shaped Steel Belts | American Standard W-shaped Wide Flange Steel |
| Application fields | mine support, rock layer reinforcement | building structures, Bridges, industrial plants |
| Material and thickness | Q235 thin plate (2.5-3.0mm) | low alloy thick steel (A572 Gr.50, etc.) |
| core function | integrated support of dispersed anchor | large-span load-bearing and flexural support |
| design goals | low cost, high section utilization rate, | high stability and standardized construction |
Summary
W-shaped steel is classified into two types based on different application scenarios:
- Mine W-shaped steel belt: Thin-walled cold-formed parts, used for low-cost rock layer reinforcement, relying on W-section integrated support systems;
- American standard W-shaped wide flange steel: Hot-rolled thick-walled structural steel, addressing the compressive and bending resistance requirements of large-span buildings.
Although the names of the two are similar, there are significant differences in materials, processes and functions. The selection should be targeted according to the engineering requirements.
Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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