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Material
A21553
Standard
GB /T 1222-2007
Spring Steels
Standard
GB /T 5218-1999
Alloy spring steel wires
Standard
GB /T 1222-2016
Spring steels
Chemical Composition
(%)
Standard
Material Designation
Chemical Composition (%)
GB /T 1222-2007
Spring Steels
55SiCrA
(
A21553
)
Min
Max
GB /T 5218-1999
Alloy spring steel wires
55CrSiA
(
A21553
)
Min
Max
GB /T 1222-2016
Spring steels
55SiCr
(
A21553
)
Min
Max
For Reference Only
