Spheroidizing Annealing Furnace for Cold Heading Wire Parameter Table

Item	Specification
Furnace Type	Strong Convection Spheroidizing Annealing Furnace
Application	Fastener Wire & Steel Coil Heat Treatment
Batch Capacity	2–40 Tons
Effective Diameter	1200–4000 mm
Effective Height	1800–4000 mm
Heating Method	Electric or Natural Gas
Heating Power	75–650 kW
Protective Atmosphere	Nitrogen / Cracked Ammonia / Mixed Gas
Control System	PLC Automatic Control
Optional Equipment	Oxygen Probe, Carbon Potential Control, Infrared Analyzer

Spheroidizing Annealing Furnace Technical Advantages

Stable Hardness for High-Speed Forming

Accurate temperature control throughout the entire heat treatment cycle produces a more uniform hardness profile across every wire coil. This allows fastener production equipment to operate with greater consistency, especially during continuous high-speed manufacturing.

Key Benefits

Consistent forming performance
Lower rejection rates
Improved dimensional accuracy
Stable material properties between production batches

High-Capacity Batch Processing

The furnace is designed for manufacturers handling large production volumes. Multiple wire coils can be processed in one batch while maintaining uniform heating conditions throughout the load.

Key Benefits

Increased production capacity
Reduced loading frequency
Improved equipment utilization
Suitable for continuous factory operation

Controlled Furnace Atmosphere

The integrated atmosphere management system protects steel surfaces throughout long spheroidizing cycles, helping preserve material quality before phosphating, coating, or drawing operations.

Key Benefits

Cleaner wire surface
Lower oxidation
Reduced decarburization
Improved surface condition for downstream processing

Flexible Process Management

Different fastener products often require different material specifications. The furnace control system allows operators to store and switch between multiple annealing programs for various steel grades and production schedules.

Key Benefits

Fast recipe selection
Reduced setup time
Improved production flexibility
Better process repeatability

Supporting Every Stage of Fastener Manufacturing

Before bolts, screws, nuts, or rivets are formed, the raw wire material must possess the right combination of ductility and strength. A well-controlled spheroidizing process makes downstream manufacturing more predictable by creating material that performs consistently on high-speed forming equipment.

This furnace is suitable for preparing materials used in:

Hex bolts
Socket head screws
Self-tapping screws
Nuts
Rivets
Washers
Stud bolts
Automotive fasteners
Construction fasteners
High-strength industrial fasteners

Industrial Annealing Furnace Challenges Solved

Manufacturers often experience quality variations that originate from inconsistent annealing rather than forming equipment.

This furnace helps address common production issues such as:

Unstable wire hardness between batches
Cracking during cold forming
Excessive die maintenance
Inconsistent thread quality
Surface oxidation after heat treatment
Production interruptions caused by material defects

By stabilizing the annealing process, manufacturers can improve both production efficiency and finished product reliability.

FAQ

1.Why is spheroidizing annealing important in fastener manufacturing?

It prepares steel for cold forming by improving ductility and reducing forming resistance, which helps produce fasteners with fewer defects and more consistent quality.

2.Which fastener products benefit from this furnace?

The furnace is suitable for materials used to manufacture bolts, screws, nuts, rivets, studs, washers, and many other standard or high-strength fastening products.