Overview
Pure Iron Hot Rolled Coil is produced by hot rolling iron slabs into thin, continuous sheets with thicknesses ranging from 1.5 mm to 20 mm. Its high purity (≥99.8% iron) ensures minimal impurities like carbon and sulfur, making it ideal for applications requiring superior magnetic performance. The hot rolling process enhances mechanical properties while maintaining cost efficiency. Unlike cold-rolled coils, hot-rolled variants exhibit slight surface scaling but offer better formability and lower production costs. They are commonly supplied in coils weighing 5-30 metric tons, with widths tailored to industrial needs such as stamping or lamination.
Physical and Chemical Properties
Pure iron’s standout feature is its soft magnetic behavior, characterized by high saturation induction (2.15 Tesla) and low core loss. These properties stem from its body-centered cubic (BCC) crystal structure, which facilitates easy magnetization. The material’s ductility allows for deep drawing and bending without cracking. Chemically, pure iron is prone to oxidation, forming rust (Fe₂O₃) in humid environments. However, its reactivity is mitigated by alloying with trace silicon or aluminum during production. The hot-rolled variant has a tensile strength of 300-450 MPa, balancing strength and workability.
Main Applications
In the electrical industry, pure iron coils are laminated into transformer cores and motor components due to their low eddy current loss. They also serve as magnetic shields in sensitive equipment like MRI machines. Automotive manufacturers use them for fuel injector cores and sensor housings. The construction sector employs these coils for reinforcing electromagnetic doors and radiation shielding. Emerging applications include green energy systems, such as wind turbine generators, where high permeability reduces energy waste.
Safety and Storage
While pure iron is non-toxic, handling hot-rolled coils requires care due to sharp edges and heavy weight. Workers should use gloves and lifting equipment. Storage areas must be dry and free from chloride exposure to prevent accelerated rusting. For long-term storage, coils are often wrapped in VCI (Vapor Corrosion Inhibitor) paper or coated with oil. Indoor storage is preferred, but outdoor stacks should be elevated and covered with tarpaulins. Regular inspections for rust spots are recommended.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO 9001 certification and mills capable of producing ASTM A848-grade iron. Key specifications to verify include thickness tolerance (±0.1 mm), width consistency, and surface finish (e.g., pickled or oiled). Bulk procurement (20+ tons) often attracts discounts, but MOQs vary by supplier. Lead times typically range from 2-6 weeks, depending on customization. Consider FOB (Free On Board) pricing for international shipments to manage logistics costs. Third-party inspection for purity via spark spectrometry is advisable.
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