Steel Wire Rod Ml40cr Chq Green Cold Heading Quality High Strength Alloy for Heavy-Duty Automotive Fasteners and Structural Bolts

Product details

Steel Wire Rod Ml40cr Chq Green Cold Heading Quality High Strength Alloy for Heavy-Duty Automotive Fasteners and Structural Bolts is a steel wire product manufactured in China and available to buyers worldwide through the GoodsFromChina sourcing service. Typical uses include Rope, Packaging, Netting, Manufacturing, Fencing, Construction, Automotive,High-End Equipment Manufacturing.

Key features

• Certification: ISO, CCC, CE
• Condition: New
• Surface: Smooth
• Technique: Hot Rolling
• Alloy or Not: Alloy
• Standard: GB/T 6478 and SAE J403
• Product Name: Ml40cr Chq Alloy Structural Steel Wire Rod
• Wire Material: 5-25mm

Excellent Cold Heading Formability

Through precise controlled rolling and controlled cooling (TMCP) combined with spheroidized annealing, the as-delivered microstructure consists of a uniform spheroidized structure with a spheroidization rate of ≥90%. Hardness fluctuation is controlled within ±15 HV, ensuring superior cold deformation capability. This enables one-step cold heading without cracking or material buildup, making it ideal for continuous production on multi-station high-speed cold heading machines.

Ultra-High Purity and Superior Surface Quality

Utilizing a full-process clean steel refining process, the steel contains extremely low levels of harmful gases and inclusions. The wire rod surface is free from defects such as oxide scale, cracks, laps, and scratches. Precise control of dimensional tolerances along the entire length significantly reduces tool wear and scrap rates during cold heading.

Consistent Property Uniformity along the Entire Length

With tight control over chemical composition within a narrow range and a fully continuous rolling process, the mechanical properties and microstructure at the head, middle, and tail of the wire rod are highly consistent. Tensile strength variation along the entire length is ≤30 MPa, ensuring stable performance during mass production of fasteners and eliminating batch-to-batch inconsistency.

Excellent Heat Treatment Adaptability

The product offers a wide quenching and tempering process window and stable hardenability. After heat treatment, it achieves an excellent balance of strength, plasticity, and toughness, reliably meeting the mechanical property requirements for 8.8 and 10.9-grade high-strength fasteners. It also exhibits superior delayed fracture resistance, making it suitable for severe service conditions.

Ordering & packaging

Minimum order quantity is 10 tons. Standard export packaging: Strap Packaging, Wooden Cases, etc. HS code: 7227200000. Every order can include a pre-shipment quality inspection and consolidated shipping by sea, air or express, including DDP delivery.