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Shanghai Jingteng Metal Group Co., Ltd.

   
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SUP7

SUP7

SUP7 Spring Steel
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SUP7 Spring Steel



Material Name


Material Name: SUP7

Characteristics and scope of application


It is the wide application of Si Mn spring steel, strength, elasticity and quenching through of slightly higher than 55si2mn. Suitable for railway vehicle, automobile and tractor industry production bear a larger load flat spring or line diameter in mm below the coil spring, and is also suitable for making working temperature of 250 DEG C or less non corrosive medium in the thermal spring and bear alternating load and the force of large volumes of spring.


Chemical Composition


C
 Si Mn S P Cr Ni Cu
0.56-0.64
 1.50-2.00 0.60~0.90 Max 0.035 Max 0.035
 Max 0.35 Max 0.35 Max 0.25

Mechanical Property


Tensile strength
σb (MPa) 		Yield Strength
σs 0.2 (MPa)
Elongation
δ 5 (％)
reduction of crosssection area
ψ (％)
Hardness
(HB)
Min 1274 Min 1176 Min 5 Min 25
 Max 321

specification of heat treatment and metallurgical structure


Specification of heat treatment : hardening 870 + 20℃, oil cooling; tempering 480 + 50℃ (special needs, + 30℃)
Metallurgical Structure: tempered troostite

Delivery State


Hot rolled steel with heat treatment or heat treatment delivery, cold drawn steel to heat treatment delivery.