Standards: EN 10089-2002
characteristics and the scope of application of:
Silicon is widely used spring steel, strength, flexibility
and 55Si2Mn hardenability slightly higher than that. For railway
vehicles, automobile and tractor industries to bear a greater load
on the production of flat spring or the diameter in 30mm below the
coil spring, also suitable for the production of working
temperature 250in the following non-corrosive medium heat in spring
and bear the load alternating and work under high stress the
important large-scale rolling spring.
Chemical Composition:
Carbon C: 0.57 ~ 0.65
Si Si: 1.60 ~ 2.00
Manganese Mn: 0.70 ~ 1.00
S S0.025
P P0.025
Chromium Cr0.45
Ni-Ni0.35
Cu Cu0.25
Mechanical Properties:
Tensile strength b (MPa)1274 (130)
Yield strength s (MPa)1176 (120)
Elongation 10 (%)5
Shrinkage section (%)25
Hardness: hot-rolled,321HB; Cold Drawn + heat treatment,321HB
Heat Treatment and Microstructure norms:
Regulate heat treatment: quenching 87020 ℃, oil-cooling;
tempering 48050(the special needs of the time,30 ℃).
Microstructure: troostite tempering.
delivery status: hot-rolled steel to heat treatment or heat
treatment state of delivery, cold-drawn steel to heat treatment
state of delivery.
