Alloy steel wire for high-strength automotive parts

Wuxi AoTian Steel Wire Products Co., Ltd. produces alloy steel wire developed for cold heading applications in the automotive industry, where high strength and reliability are essential. These wires are designed for the manufacturing of safety-critical fasteners and structural components, including high-tensile bolts, nuts, and other precision automotive parts.

Using controlled drawing and spheroidizing annealing under nitrogen protection, AoTian ensures stable hardness, uniform microstructure, and superior mechanical performance. Alloy additions such as boron, chromium, and molybdenum provide improved hardenability, strength, and fatigue resistance, making the wire ideal for demanding automotive applications.

Available alloy grades:

• Boron steels: 10B21, 10B33, 10B35, 10B38, 20MnB4, 23MnB4
• Chromium steels: 41Cr4, 42CrMo4
• Chromium-molybdenum steels: SCM435, SCr440
• Other custom grades on request

Diameter range: 0.5 mm to 42.0 mm
Inner coil diameters: 350 mm to 1500 mm

Key benefits:

•  High tensile strength and excellent fatigue resistance
•  Uniform microstructure for stable cold forming
•  Improved hardenability due to alloying elements
• Suitable for automotive-grade bolts, nuts, and structural parts

Manufactured under ISO 9001 and IATF 16949 certified systems, all wires come with full traceability and detailed quality certificates. Third-party testing (e.g., SGS) is available upon request to confirm compliance with international automotive standards.

To learn more about alloy steel wire solutions for high-strength automotive parts, please contact Wuxi AoTian Steel Wire Products.