Overview
Pickled axle housing coils are cold-rolled steel products treated with hydrochloric or sulfuric acid to remove mill scale and iron oxides. This process creates a clean, reactive surface ideal for subsequent forming and welding operations in axle production. The material typically meets GB/T 20564 or EN 10149 standards for high-strength automotive steels. Major manufacturers produce these coils in thicknesses ranging from 2.0-8.0mm, with yield strengths between 345-700MPa. The pickling process reduces surface roughness to Ra ≤1.6μm while maintaining precise dimensional tolerances required for precision stamping of axle components.
Structure and Working Principle
The coil consists of continuous steel strip wound under tension, with inner diameters of 508mm or 610mm for compatibility with standard uncoiling equipment. Acid washing occurs through sequential immersion in pickling tanks followed by high-pressure water rinsing and drying. Modern pickling lines incorporate automatic concentration control systems that maintain optimal acid strength (typically 10-20% HCl). Temper rolling after pickling improves flatness (≤3mm/m) and imparts slight cold working to enhance formability. The final product is oiled for temporary corrosion protection during storage and transport.
Key Features
Superior surface quality (Class A per GB/T 8923.1) ensures consistent paint adhesion and coating performance. The absence of scale eliminates weld porosity issues common in hot-rolled alternatives. Material certificates include traceability to heat numbers for quality assurance. Controlled chemical composition (C≤0.20%, P≤0.030%) guarantees good weldability without preheating. The pickled surface's activation energy promotes better phosphate conversion coating during later e-coating processes, a critical factor for axle housing durability in corrosive environments.
Application Areas
Primary applications include stamping of axle housing halves, reinforcement ribs, and mounting brackets for commercial vehicles. The material's consistent mechanical properties make it suitable for robotic welding systems in automated production lines. Secondary uses involve agricultural equipment axles and low-loader trailer components where weight reduction through high-strength grades is prioritized. Some manufacturers employ pickled coils as blanks for laser-cut axle flanges and suspension attachment points due to the clean cutting edges achieved.
Maintenance and Precautions
Storage should occur in dry warehouses with relative humidity below 70% to prevent flash rusting. Coils require rotation within 3 months if stored outdoors with proper covering. Edge damage during handling can cause coil breaks - always use nylon slings instead of steel hooks. Forming tools should have polished surfaces (Ra ≤0.8μm) to prevent galling. Post-forming cleaning with alkaline degreasers removes protective oils before welding. Weld parameters may need adjustment compared to hot-rolled steel due to the material's lower thermal conductivity.
B2B Procurement Guide
Key specifications to specify include: steel grade (e.g., Q345B, S700MC), thickness tolerance (preferably ≤±0.05mm), internal coil diameter, and maximum camber (≤3mm/2m length). Request mill test certificates with actual yield/tensile strength data. For quality verification, require sample coils for trial stamping and salt spray testing (≥720 hours to red rust). Consider suppliers with in-house slitting capabilities to reduce material waste. Bulk purchases (≥50 tons) typically secure 5-8% price advantages, with lead times of 15-30 days for non-standard grades.
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