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ASTM1566 Spring Steel

ASTM1566 Spring Steel

ASTM1566 Spring Steel
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ASTM1566 Spring Steel



ASTM1566 Spring Steel


Material Name: 1566
Execution standard:ASTM A29/A29M-04

Characteristics and scope of application


Manganese increases the hardenability, Phi 12mm steel oil can hardenability and surface decarburization tendency is smaller than the silicon steel, the comprehensive mechanical properties after heat treatment are better than carbon steel, but overheating sensitivity and temper brittleness. As a small size of flat, round spring, cushion spring, spring, spring ring, valve spring, clutch spring, brake spring and cold drawn steel wire cold coiled helical springs.    

Chemical Composition


C Si Mn S P Cr Ni Cu
0.60～0.71 0.17～0.37 0.85～1.15 Below 0.050 Below 0.040
 Below 0.25 Below 0.25 Below 0.25

Mechanical Property


Tensile strength
σb (MPa) 		Yield Strength
σs (MPa)
Elongation
δ10 (％)
reduction of crosssection area
ψ (％)
                       Hardness
hot rolling                           cold-drawn+heat treatment

Above 980 Above 784 Above 20 Above 30
 Below 302HB                    Below 321HB

specification of heat treatment and metallurgical structure


Specification of heat treatment : hardening 830℃±20℃  oil cooling; tempering 540℃±50℃ (±30℃ when needed)
Metallurgical Structure: troostite

Delivery State


Delivery in heat treatment or non heat treatment state with hot rolled steel, and in heat treatment with cold drawn steel.