SPRING RANGE

Hot-Coiled Springs for Heavy-Duty Operating Conditions

Structure and Features

Wire diameter range (mm)

20-100mm

Outer diameter range (mm)

100-1200mm

Free height range (mm)

200-3000mm

Spring Rate Range (N/mm)

10-500 N/mm

Operating Temperature (°C)

-40°C～+200°C

Surface treatment

Available Materials (Hot-Coiled Springs)

60Si2Mn60Si2Cr60Si2CrV60Si2CrVAT50CrV51CrV451CrMoV4

core product

Product series

Railway spring

BUILT FOR STRENGTHDESIGNED FOR PERFORMANCE

PRODUCTION TECHNOLOGY

PRODUCTION BASE SPRING
WORKSHOP

The spring workshop is equipped with advanced machinery, including fully automatic CNC spring coiling machines and spring grinding machines. This enables the high-precision, automated production of suspension springs and ensures stable, reliable product quality.

Hot-Coiled Spring

CNC coil spring machine

Fully automatic computer control, realize high precision rolling of complex spring shape, and improve production efficiency significantly

Spring grinding machine production line

Automated spring grinding equipment ensures the flatness of both spring ends, enhancing the fatigue life and overall consistency of the products.

MANUFACTURING PROCESS

Traceable production workflows for springs

01 Select material
Selection of Jinan steel/Qinggang raw materials, inspection before leaving the factory to ensure good condition
02 Material Cutting
Accurately calculating dimensions according to technical drawings, executed precisely using industrial cutting machines or saws
03 Heating
Heated in a bogie hearth electric furnace to approximately 950°C and held at this temperature for 1.5 to 2 hours
04 Hot coil
Fully automated equipment forms the steel spring to precise dimensions in a single operation
05 Quenching
Following hot coiling at 830-870°C, the springs are cooled in a water-based quenchant for 30 minutes before being transferred to the tempering furnace
06 Tempering
Heated to 400-430°C for a duration determined by the wire diameter, followed by rapid cooling upon removal from the furnace
07 Cutting
After cooling, the spring is cut with a reserved allowance for end-face grinding
08 Endface grinding
Fully automatic grinding machines complete coarse, fine, and corrective grinding in a single pass, ensuring an end-face angle of 230-270°

application area

RAILWAY SYSTEM SUSPENSION AND BOGIES

Utilized in critical components such as train carriage suspensions and locomotive bogies, effectively absorbing shocks and vibrations to enhance ride smoothness and operational safety.