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Material
GB /T 8731-2008
Free-Cutting Structural Steel
Material Designation
Chemical Composition (%)
Y08Pb
(
U72082
)
Min
Max
Y12Pb
(
U72122
)
Min
Max
Y15Pb
(
U72152
)
Min
Max
Y08
(
U71082
)
Min
Max
Y12
(
U71122
)
Min
Max
Y15
(
U71152
)
Min
Max
Y20
(
U70200
)
Min
Max
Y30
(
U70302
)
Min
Max
Y35
(
U70352
)
Min
Max
Y45
(
U70452
)
Min
Max
Y08MnS
(
U71088
)
Min
Max
Y15Mn
(
U71156
)
Min
Max
Y35Mn
(
U70356
)
Min
Max
Y40Mn
(
L20409
)
Min
Max
Y45Mn
(
U70456
)
Min
Max
Y45MnS
(
U70458
)
Min
Max
Y45Ca
(
U73450
)
Min
Max
Y45MnSn
(
U74456
)
Min
Max
Y45Sn
(
U74452
)
Min
Max
Y15Sn
(
U74152
)
Min
Max
Y08Sn
(
U74082
)
Min
Max
Y45MnSPb
(
U72458
)
Min
Max
For Reference Only
