从China供应商批发进口Aisi 4140 Round Bar — FOB条款

The AISI 4140 round bar from Neworigin Special Steel Co. Ltd. is a chromium-molybdenum alloy steel designed for high-strength mechanical applications. The material’s composition includes carbon at 0.38 - 0.43%, chromium at 0.80 - 1.10%, and molybdenum at 0.15 - 0.25%, delivering a combination of tensile strength, toughness, and fatigue resistance. Available in diameters from 12 mm to 300 mm and lengths of 3 - 6 meters, this grade meets ASTM A29 and SAE standards for medium-carbon alloy steels.

This round bar is widely used in industries such as oil and gas, automotive, and aerospace for components like shafts, gears, and axles. The alloy’s hardenability allows it to achieve uniform mechanical properties in larger sections, with typical as-rolled hardness around 20 - 22 HRC. Heat treatment, such as quenching and tempering, can increase hardness to 28 - 32 HRC while maintaining ductility. The manganese content (0.75 - 1.00%) further enhances hardenability and wear resistance, making it suitable for dynamic loading conditions.

Buyers of this grade include manufacturers of machinery, heavy equipment, and structural components where high stress resistance is critical. Neworigin Special Steel offers the material in AISI, DIN, and JIS standards, with custom sizes available upon request. Packaging for export typically involves bundling with steel straps and protective coatings to prevent corrosion during transit. Confirm specific dimensions, tolerances, and additional certifications directly with the supplier to match project requirements.

Neworigin Special Steel Co. Ltd. is headquartered in Shenzhen, Guangdong Province, with its office located on Hongmian Road in the Yingdali A206 building. The company positions itself as a trader, stockist, and exporter of specialty steels, including AISI 4140 round bar. Its focus on offering multiple standards (AISI, DIN, JIS) suggests a broad inventory tailored to international buyers, though the absence of published certifications means these must be confirmed per order.

The supplier’s harbor trust tier indicates a verified export capability, but response metrics are not currently available. Neworigin highlights competitive pricing and a wide size range as key advantages, though buyers should validate stock availability and lead times for specific diameters. The company’s description emphasises its role as a trader rather than a mill, so traceability of the material’s origin and heat numbers should be requested for critical applications.