Hot-Coiled Springs
Hot-wound springs are helical springs formed at high temperatures (typically above the material’s recrystallization temperature), primarily used for heavy-load, high-impact, or extreme environment applications.
- Hot-Wound vs Cold-Wound Springs
| Comparison | Hot-Wound Springs | Cold-Wound Springs |
| Forming Temp. | High temperature (~900°C+) | Room temperature |
| Material | Large-diameter bars (Φ>16mm) | Steel wire (Φ<16mm) |
| Applications | Heavy machinery, railways, mining, defense | Electronics, vehicle suspensions, small mechanisms |
| Strength | Higher (due to stress relief) | Relatively lower |
| Surface Finish | Requires post-treatment (e.g., shot peening) | Smooth, ready-to-use |
2.Manufacturing Process
•Material Heating: Spring steel bars (e.g., 60Si2MnA, 55CrSi) are heated to austenitizing temperature (~850–950°C).
•Hot Coiling: Formed into a helix shape using a coiling machine while red-hot.
•Quenching + Tempering: Rapid cooling (quenching) followed by medium-temperature tempering for elasticity and toughness.
•Surface Treatment: Shot peening, anti-corrosion coatings (e.g., zinc plating, epoxy).
- Key Features
- High Load Capacity: Suitable for static or low-frequency heavy loads (e.g., railway buffer springs).
- Fatigue Resistance: Hot-working refines grain structure for extended service life.
- Size Flexibility: Can produce extra-large diameters (e.g., Φ200mm+) or custom shapes.
- Typical Applications
- Rail Transport: Train bogie suspension springs, coupler systems.
- Construction Machinery: Excavator and crane suspension systems.
- Defense Equipment: Tank track buffers, artillery recoil mechanisms.
- Energy Sector: Wind turbine pitch control springs.
Shuangyuan produce hot coil spring with wire diameter from 20mm to 60mm.
We have advanced production equipment and many years production experiences.
Currently,we export our hot coil spring to Sigapore and Indonesia.
Our customer has cooperate with us over 10 years.
Mainly used in Miner Equipment.
