1018 Cold Rolled Steel Round Bar
1018 cold rolled steel round bar is a high quality low carbon steel with a carbon content of about 0.18%. It has good comprehensive properties. It has a smooth surface and high dimensional accuracy, which can meet the needs of high-precision processing. It has excellent cold formability and is easy to bend, stamp and stretch. At the same time, it has good welding performance and can maintain stable structural strength under various welding processes. It is widely used in automotive parts, machinery manufacturing, hardware processing and other fields.
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Product Introduction
1018 Cold Rolled Steel Round Bar, a widely used high-quality carbon structural steel product, is a preferred material in the machinery manufacturing, automotive, and general hardware industries due to its balanced performance, excellent processing adaptability, and stable quality. The core advantages of 1018 Cold Rolled Steel Round Bar stem from its precise component ratio and advanced cold rolling process, achieving an ideal balance between strength, toughness, and machinability, meeting the precision manufacturing needs of various scenarios.
Cold Drawing Process of the Product
Cold-rolled round steel billets conforming to AISI 1018 standards are selected. Surface oxide scale and rust are first removed by mechanical peeling or pickling to prevent surface scratches during drawing. One end of the billet is then rolled to a size smaller than the die diameter to ensure smooth die penetration. Meanwhile, the billet is inspected for cracks and a uniform composition to guarantee processing stability.
After pickling, the billet is immersed in lime slurry or a special lubricant to form a uniform lubricating film. This process reduces friction between the die and the steel during drawing, minimizes die wear, and prevents surface scratches caused by work hardening of 1018 steel, laying a foundation for high-precision forming.
At room temperature, the lubricated billet is fixed on a cold drawing machine and pulled through a die with a preset diameter by traction force. Leveraging the cold plastic deformation characteristics of metals, the steel cross-section is reduced and the length is extended. The per-pass deformation is controlled as required, and multiple draws are conducted if necessary to enhance the tensile strength and surface hardness of 1018 steel.
After drawing, the material undergoes low-temperature annealing at 600-650℃ to eliminate internal stress and restore partial plasticity. It is then straightened, cut to length, and the chuck scrap is removed. Finally, anti-rust treatment is applied. The dimensional tolerance of the finished product is controlled within ±0.1mm to meet precision machining requirements.
Product Application Scenarios
Mechanical Manufacturing: Used for processing various shaft parts, gear blanks, washers, nuts, and other general-purpose accessories. Leveraging its excellent cold workability and machinability, it is suitable for mass production and meets the requirements of general mechanical transmission and connection.
Automotive Parts: Used to manufacture non-core load-bearing parts such as automotive seat rails, door lock assemblies, brake system connectors, and engine auxiliary brackets. It balances cost and structural stability, complying with the large-scale production standards of the automotive industry.
Hardware Tools: Used to produce handles and connecting rods for hand tools such as wrenches, screwdrivers, and hammers, as well as hardware stampings and fastener blanks. Subsequent processing enables it to achieve good grip and structural strength.
Construction and Decoration: Used to manufacture door and window hardware accessories, curtain wall connectors, and bracket embedded parts. It can adapt to normal indoor and outdoor environments and is easy to be galvanized and painted to enhance rust resistance.
Electronics and Home Appliances: Used for processing internal support shafts, terminal blocks, radiator brackets, and instrument housing frames of home appliances. Its precise dimensional tolerances and good plasticity allow it to adapt to the compact structural design of home appliances.
Agricultural Machinery and Construction Machinery: Used to manufacture connecting parts for agricultural implements, small pins for construction machinery, and auxiliary pipeline joints for hydraulic systems. Capable of withstanding loads under normal operating conditions, it offers better cost-effectiveness than high-alloy steel, helping control equipment manufacturing costs.
Core Product Advantages
Excellent Machinability and Weldability
Featuring a low-carbon composition, it offers exceptional cold workability, easily accommodating processes like turning, milling, drilling, and tapping. The machined surface achieves superior smoothness and finish, eliminating the need for complex secondary grinding. Its excellent weldability is compatible with various welding processes, producing high-quality weld seams without cumbersome preheating or post-heat treatment, thereby significantly boosting processing efficiency.
Precise Dimensions and Superior Surface Finish
The cold rolling process ensures strict dimensional tolerance control, with minimal diameter deviation and excellent straightness, directly meeting the processing demands of high-precision components. After cold rolling and low-temperature annealing, the surface is smooth, flat, and free of oxide impurities, reducing subsequent processing steps and making it ideal for applications with strict appearance requirements.
Balanced and Stable Mechanical Properties
Cold deformation strengthening enhances its strength and hardness significantly while retaining good toughness, achieving an optimal balance between strength and toughness. It exhibits excellent performance consistency and stable hardenability; surface wear resistance can be further improved via carburizing, making it suitable for light to medium-load components and complex operating conditions.
High Cost-Effectiveness and Wide Applicability
As a low-carbon high-quality structural steel, it boasts economical raw material costs, delivering excellent cost-effectiveness in mass production. It is widely used in machinery manufacturing, automotive, hardware, and other fields, suitable for producing gears, shafts, fasteners, tooling fixtures, and more. It is a highly versatile basic industrial material.
Quality Control and Inspection
Raw Material Control
Verify the chemical composition of hot-rolled billets to ensure that the carbon content (0.15%-0.20%) and manganese content (0.60%-0.90%) meet the 1018 grade standard, and prevent excessive sulfur and phosphorus content. Visually inspect the billet surface for defects such as cracks, scabs, and folds, and control dimensional deviations within allowable ranges to avoid affecting subsequent cold rolling precision.
Cold Rolling Process Control
Strictly control the rolling temperature within the room temperature range, and precisely adjust the mill reduction, rolling speed, and tension parameters to prevent uneven steel deformation caused by parameter fluctuations. Regularly calibrate the mill equipment, monitor roll system wear, and replace worn parts promptly to ensure rolling stability.
Dimensional Accuracy Inspection
Use an outside micrometer and roundness tester to inspect each batch. Outside diameter tolerances are controlled in accordance with the GB/T 702 standard, and the roundness error does not exceed 50% of the diameter tolerance. Use a straightedge and feeler gauge to check straightness, ensuring that the deflection per meter is ≤0.5mm to meet precision machining requirements.
Mechanical Properties and Surface Quality Inspection
Conduct tensile tests on samples to ensure a tensile strength of ≥370MPa, a yield strength of ≥220MPa, and elongation that meets grade requirements. Inspect the surface visually with a magnifying glass to ensure no scratches, oxide scale, decarburized layers, or other defects. Conduct hardness testing if necessary to ensure uniform performance.
About Us
Located at No. 1, Baihe Road, Hudai Town, Binhu District, Wuxi City, Jiangsu Zhongao New Steel Technology Co., Ltd. is a professionally licensed manufacturer specializing in the production, processing and wholesale of cold-drawn steel products-including round, square, hexagonal, bright, silver-bright and heat-treated round steel.
Our diverse, high-quality cold-drawn steel is widely applied across key sectors: wind power anchor bolt fasteners, automotive parts, medical components, logistics machinery, hardware, electrical appliances, elevator equipment and precision instrument parts, delivering reliable performance for clean energy, machinery manufacturing and light industry.
Guided by the principle of providing superior products and customer-centric services, Zhongao upholds strict quality control and continuous innovation. Choosing Zhongao means choosing professional, dependable steel solutions to underpin your project success.
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