ML20Cr/20Cr cold heading steel hot rolled rod

ML20Cr and 20Cr cold heading steel hot-rolled wire rods, as prominent materials in the metal processing field, are high-performance steel products meticulously developed to meet the requirements of cold heading forming processes. They possess outstanding cold heading properties and can be efficiently processed into various complex-shaped and high-precision fastening components, which are widely applied in numerous industries such as automobile manufacturing, mechanical equipment, and building hardware, providing a solid guarantee for the high-precision and high-strength connection demands in modern industrial production.

I. Product Specifications and Packaging

(1) Diverse Specifications

ML20Cr/20Cr cold heading steel hot-rolled wire rods offer a rich variety of specification options, covering different diameter ranges, typically from 5.5mm to 20mm. This caters to the processing needs of various industries for different-sized components. Whether it's tiny and precise connectors for electronic devices or high-strength bolts in large industrial equipment, suitable wire rod specifications can always be found.

(2) Fine Packaging

To ensure the quality of the products remains unaffected during transportation and storage, a professional packaging method is adopted. The wire rods are neatly wound on high-strength I-beam reels. Each reel is covered with moisture-proof and rust-proof plastic film and then encapsulated with multi-layer corrugated cartons, effectively isolating external moisture, dust, and mechanical damage. Meanwhile, key information such as product specifications, models, batches, and weights is clearly marked on the packaging for users to easily identify and manage inventory.

II. Product Characteristics

(1) Excellent Cold Heading Properties

Good Plastic Deformation Ability: During the cold heading forming process, ML20Cr/20Cr wire rods can effortlessly withstand tremendous plastic deformation pressures and be smoothly upset and extruded into the desired shapes, such as the heads of bolts and nuts of various specifications. This effectively reduces the scrap rate in the forming process and improves production efficiency.

Low Deformation Resistance: Compared with ordinary steels, they require less external force during cold working. This not only reduces the power requirements of processing equipment and energy consumption but also mitigates the wear of molds and cuts production costs, creating favorable conditions for large-scale and continuous production.

(2) Stable Mechanical Properties

High Strength: After appropriate heat treatment, the tensile strength and yield strength of the steel are significantly enhanced, enabling it to meet the stringent strength requirements of various fastening parts under complex stress conditions, ensuring the reliability and safety of connections. For example, bolts made of ML20Cr/20Cr cold heading steel used in critical bolted connections of automobile engines can still firmly lock in place even in high-temperature and high-vibration environments, preventing component loosening.

Good Toughness: While possessing high strength, the steel also maintains good toughness, effectively preventing brittle fractures of components under sudden impact loads. This characteristic is particularly crucial in the connections of moving parts of mechanical equipment. For instance, cold heading steel pins in pin connections of construction machinery can work stably under frequent impacts, ensuring the normal operation of the equipment.

(3) Outstanding Surface Quality

Smooth Surface: By employing advanced hot rolling processes, combined with precise rolling equipment and strict control of process parameters, the surface of the wire rods is extremely smooth, without obvious rolling defects such as cracks, folds, and scabs. This not only provides a good foundation for subsequent cold heading processing, reducing surface damage during processing but also enhances the appearance quality of the final product, making it more competitive in the market.

Low Surface Oxidation: During the hot rolling process, through optimized temperature and oxygen control measures, the oxidation phenomenon on the steel surface is effectively suppressed, reducing the generation of iron oxide scale. This not only reduces the workload and cost of subsequent surface treatment processes such as pickling but also avoids the decarburization problem on the steel surface caused by excessive oxidation, ensuring the uniformity of steel properties.

III. Precautions for Use

(1) Preparation before Processing

Material Inspection: Before commencing cold heading processing, it is essential to conduct a comprehensive inspection of the chemical composition, mechanical properties, and surface quality of the wire rods to ensure they meet the corresponding standards and processing requirements. If any defects or non-conforming performance are detected, timely communication with the supplier should be made to resolve the issue.

Mold Adaptation: According to the specifications of the wire rods and the shape of the parts to be processed, carefully select suitable cold heading molds. The cavity dimensions, surface roughness, and hardness of the molds should match the characteristics of the steel to ensure smooth forming and reduce mold wear.

(2) Control during the Processing Process

Reasonable Processing Parameters: Strictly control the deformation speed, upset ratio, extrusion pressure, and other process parameters of cold heading processing. Excessively high deformation speeds may lead to steel cracking, while overly low speeds affect production efficiency; an oversized upset ratio is prone to causing processing defects, and a too-small ratio cannot achieve the desired shape. The optimal process parameters should be determined through experimentation based on the characteristics of the steel and the requirements of the parts.

Equipment Maintenance: Regularly maintain and service the cold heading processing equipment, checking key parts such as the transmission system, hydraulic system, and control system to ensure the normal operation of the equipment. Equipment failures can lead to a decline in processing accuracy, an increase in the scrap rate, and even damage to the steel and molds.

(3) Post-processing

Heat Treatment Optimization: According to the performance requirements of the final product, reasonably arrange the heat treatment process. For components requiring higher strength and hardness, such as critical bolts in automobile engines, the quenching and tempering process can be adopted, precisely controlling the heating temperature, holding time, and cooling rate to achieve the ideal microstructure and performance state.

Surface Protection: After completing processing and heat treatment, the components should be promptly subjected to surface protection treatments, such as galvanizing, nickel plating, and Dacromet coating, to prevent component failure due to corrosion during use and extend their service lives.

With its outstanding performance, wide range of applications, reliable quality assurance, and comprehensive service system, ML20Cr/20Cr cold - heading steel hot - rolled wire rod is undoubtedly an ideal choice for you to pursue high - quality and high - efficiency in modern industrial production. We welcome customers from all walks of life to make inquiries and place orders!

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