Features And Scope Of Application for 250A53/ EN45 Spring Steel:
Silicon and manganese to improve the elastic strength and flexion ratio, improve hardenability, anti-tempering stability and anti-relaxation stability, overheating sensitivity is smaller, but the decarbonization tendency is larger, especially [SCALE STEEL]when silicon and carbon content is higher, carbon is easy to graphitization, make steel brittle.Used as vibration damping plate spring and coil spring, cylinder safety valve spring on automobiles, tractors and locomotives, and also can be used as heat resistant spring under 250℃.
Chemical Composition of 250A53/ EN45 Spring Steel(%):
C: 0.52 ~ 0.60 Si: 1.50 ~ 2.00
Mn: 0.60 ~ 0.90
S: sulfur 0.035 or less
P P: 0.035 or less
Chromium [SCALE STEEL]Cr: 0.35 or less
Ni Ni: 0.35 or less
Copper Cu: 0.25 or less
Mechanical Properties of 250A53/ EN45 Spring Steel:
Tensile strength B (MPa) : ≥1274(130)
Yield strength S[SCALE STEEL] (MPa) : ≥1176(120)
Elongation = 10 (%) : ≥6
Reduction of area bits (%) : 30 or higher
Hardness: Hot rolling,≤302HB;Cold drawing + heat treatment,≤321HB
Heat Treatment Specification And Metallographic Structure for 250A53/ EN45 Spring Steel:
Heat treatment specification: quench 870℃±20℃, oil cooling;Temper 480℃±50℃(±30℃ for special needs).
Metallographic structure: Tempered troostite.
Delivery Status: Hot rolled steel [SCALE STEEL]delivered in heat treatment or no heat treatment state, cold drawn steel delivered in heat treatment state.