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Cold-formed steel varieties and processes
Cold-formed steel comes in a wide variety of shapes and sections, including open, semi-closed, and closed profiles. Common products include cold-formed channel beams, angle sections, Z-shaped steel, corrugated steel sheets, square tubes, rectangular tubes, welded special-shaped steel, and rolling doors. Typically, the material is produced with a thickness of 6 mm or less and a width not exceeding 500 mm, making it ideal for lightweight structural applications.
In China, commonly used types include equal-leg angle steel (with leg lengths ranging from 25 to 75 mm), inner-rolled angle steel (leg lengths from 40 to 75 mm), standard channel steel (heights from 25 to 250 mm), and inner-crimped channel steel (heights from 60 to 250 mm). There are over 400 specifications of Z-shaped steel available, with heights ranging from 100 to 180 mm. These materials are widely applied across industries such as mining, construction, agricultural machinery, transportation, bridges, petrochemicals, light industry, and electronics.
Puri Steel's cold-formed steel is a key material in constructing light steel structures, manufactured through cold bending of steel plates or strips. This process allows for very thin walls and simplifies production, significantly improving efficiency. It enables the creation of complex cross-sections that are difficult to produce using traditional hot rolling methods. Cold-formed steel is also used extensively in vehicle and agricultural machinery manufacturing.
According to GB6725-92 standards, cold-formed steel is made from ordinary carbon structural steel, high-quality carbon structural steel, or low-alloy structural steel. As an economical and energy-efficient material, it has strong market vitality and is widely used in various economic sectors. Its applications include highway guardrails, steel structures, automobiles, containers, formwork, scaffolding, railway vehicles, ships, bridges, sheet piles, and transmission towers.
In the production of cold-formed hollow rectangular steel, two main forming methods are used: one involves rounding first and then shaping into square or rectangular, while the other directly forms square or rectangular shapes. The direct forming method is currently the most advanced, as it causes less damage to the steel strip or coil material. This technique preserves the mechanical and physical properties of the raw material, ensuring high-quality output. A large steel pipe factory in Tai’an, Shandong Province, has successfully implemented this technology, achieving excellent forming results.
With increasing demand in China, the application scope of cold-formed steel continues to expand, offering promising market opportunities. There is a growing need for stainless steel, galvanized sheets, high-strength and ultra-high-strength low-alloy cold-formed steel, as well as ultra-thick and ultra-thin sections with complex cross-sections.