Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of spheroidizing annealing in China. Please feel free to buy durable spheroidizing annealing made in China here from our factory. All customized products are with high quality and competitive price.
Process Specifications
|
Parameter |
Specification |
|
Typical Process |
Heat to 720–740°C, hold, then slow cool in stages (10°C/h to 660–680°C, then 20°C/h) |
|
Applicable Materials |
45#, 20# carbon steel; 40Cr, 35CrMo, 20CrMnTi alloy steel; 6061/6063 aluminum; 304 stainless steel; brass |
|
Typical Hardness After Treatment |
HV0.3: 120–140 |
|
Spheroidization Rating |
5–6 |
|
Certifications |
IATF 16949, ISO 14001, ISO 45001, IECQ QC080000 |
Performance Highlights
Lamellar carbides → spheroidal carbides
The process transforms brittle, lamellar cementite into soft, globular particles, reducing deformation resistance and enabling cold forming of high-carbon and alloy steels.
Multi-stage cooling for uniform spheroidization
Controlled step-cooling ensures carbide morphology and distribution are consistent throughout the material, preventing residual lamellar structures.
Essential preparation for cold heading and extrusion
Spheroidizing annealing is the necessary pre-treatment for cold forming steels, directly affecting formability and tool life in subsequent operations.
Broad material compatibility
Carbon steels, alloy steels, stainless steels, aluminum alloys, and brass are processed with optimized heating and cooling parameters.
Applications
Wire Rod Pre-Treatment for Cold Heading
Medium-carbon steel wire rods (SWRCH35K, etc.) are spheroidized to HV0.3 120–140, enabling cold heading without cracking.
Automotive Fastener Blanks
Blanks for bolts, nuts, and other cold-headed fasteners are spheroidized before forming to reduce deformation resistance and extend die life.
Bearing and Transmission Components
Bearing rings, gear blanks, and other parts are spheroidized before cold extrusion to prepare for subsequent precision forming.
Why Spheroidizing Annealing
Conventional annealing – reduces hardness but not enough for demanding cold forming; cracking risk remains high
Spheroidizing annealing – produces spheroidal carbides, significantly improving plasticity and reducing deformation resistance - essential for high-difficulty cold forming
For cold-headed fasteners, cold-extruded bearings, and transmission components - spheroidizing annealing is the required pre-treatment for production.
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