Overview
Solid 45# round steel bar is a medium carbon steel with a carbon content of 0.42-0.50%, classified under GB/T 699-2015 standard in China. It is widely used in industrial applications due to its balanced properties of strength, ductility, and machinability. The material is produced through hot rolling or cold drawing processes, ensuring consistent quality and dimensional accuracy. Its versatility makes it suitable for both structural and mechanical components, particularly in heavy-duty environments.
Physical and Chemical Properties
45# round steel exhibits a tensile strength of 600-800 MPa and a yield strength of 355 MPa, making it suitable for load-bearing applications. Its hardness ranges from 170-210 HB, allowing for ease of machining while maintaining durability. The steel's chemical composition includes manganese (0.50-0.80%), silicon (0.17-0.37%), and traces of sulfur and phosphorus (≤0.035%). These elements contribute to its weldability and resistance to wear, though heat treatment (e.g., quenching and tempering) is often applied to enhance performance.
Main Applications
In machinery manufacturing, 45# round steel is commonly used for shafts, gears, and connecting rods due to its high fatigue resistance. The automotive industry employs it for crankshafts and axle components, where strength and precision are critical. Construction applications include bolts, anchors, and support structures. Its weldability and adaptability to various finishing processes (e.g., grinding, turning) make it a preferred material for custom-fabricated parts.
Safety and Storage
When machining 45# steel, proper ventilation is essential to disperse metal dust, and PPE (e.g., gloves, goggles) should be worn. Cutting fluids are recommended to reduce heat buildup during processing. Storage requires a dry environment to prevent oxidation. Coating the bars with anti-rust oil or storing them on pallets with moisture barriers can extend shelf life. Regular inspections for surface rust are advised.
B2B Procurement Guide
Buyers should request mill test certificates to verify compliance with standards like GB/T 699 or ASTM A29. Key procurement metrics include diameter tolerance (±0.1 mm for precision applications) and straightness (≤1.5 mm/m). Bulk purchases (10+ tons) often qualify for discounts, but suppliers should be vetted for consistent quality. Lead times vary; domestic suppliers typically deliver within 2-4 weeks, while international shipments may take 6-8 weeks.
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