**Tianjin Steel Strand: Construction, Classification, and Applications**
Tianjin steel strand, commonly known as wire rope, is a critical component used in lifting operations. It serves as the primary load-bearing element during hoisting and unloading processes. Known for its uniform breaking area, soft texture, high elasticity, and excellent strength, it is also highly resistant to wear and can withstand impact loads. When wound on a reel, it operates smoothly, with minimal noise, light weight, and high safety. In case of breakage or damage, it is easy to detect and repair promptly.
Tianjin steel strands are manufactured from specially treated steel wires. The most common type consists of six outer strands and a central core, typically made of hemp. Depending on their structural design, they can be classified into different types based on manufacturing methods. Here’s a detailed breakdown:
1. **By Clamping Method**:
Tianjin steel strands can be categorized into three types based on how the strands are twisted: directional, interactive, and mixed. Directional strands have the same direction as the rope's twist, while interactive strands are twisted in the opposite direction, such as right-lay ropes with left-lay strands. This interaction prevents loosening and twisting, which is why all crane applications use interactive strands for better stability and reliability.
2. **By Surface Treatment**:
Steel strands can also be classified by their surface treatment. There are smooth steel strands and galvanized steel strands. Galvanized versions are often used in outdoor cranes to prevent rusting and increase longevity.
3. **By Strand Composition**:
Based on the number of strands and wires per strand, common configurations include 6×7, 6×19, 6×37, 6×61, and others. Cranes typically use 6×19+1, 6×37+1, and 6×61+1 configurations. These variations affect performance: strands with fewer wires per bundle are thicker, offering better wear resistance but lower flexibility, while those with more wires are softer but less durable under heavy wear.
This article provides an overview of the construction, classification, and practical usage of Tianjin steel strands. Whether for industrial lifting, construction, or marine applications, understanding these characteristics helps in selecting the right type for specific tasks.
Source: http://news.chinawj.com.cn
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