Grades, chemical compositions and mechanical properties of free-cutting structural steels Grades and chemical compositions of free-cutting structural steels
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Uses for hot and cold drawn steel and steel wire for general machine tools and automatic machine tools.
Brand
Chemical composition (mass fraction) (%)
C
Si
Mn
S
P
Pb
Y12
O.08～O.16
0.15～O.35
0.70 to 1.00
0.10~0.20
O.08~0.15
Y12Pb
0.08~0.16
≤0.15
0.70 to 1.10
O.15~0.25
O.05
0.15～O.35
Y15
0.10～O.18
≤O.15
0.80~1.20
O.23～O.33
Y15Pb
O.10～O.18
≤O.15
O.80～1.20
0.23 to 0.33
0.10
O.15～0.35
Y20
O.17~0.25
O.15～O.35
O.70~1.00
O.08~0.15
≤0.06
Y30
0.27～O.35
0.15～O.35
O.70~1.00
O.08～O.15
≤O.06
Y35
0.32~0.40
O.15～0.35
O.70~1.00
O.08～O.15
≤0.06
Y40Mn
0.37～O.45
0.15～O.35
1.20~1.55
0.20 to 0.30
≤O.05
Y45Ca
0.42～0.50
O.20～O.40
O.60～0.90
0.04~0.08
≤O.04
Ca0.002～0.006
Note: The content of Ni, Cr and Cu (mass fraction) of residual elements in Y45Ca steel is not more than 0.25%; when used for heating pressure processing, Cu content (mass fraction) is not much 0.20%. The supplier can guarantee that it is not greater than this value and can not be analyzed.
(2) Mechanical properties are shown in Table 3-26 and Table 3-27.
Mechanical properties of free-cut structural steel hot-rolled strip steel
Brand
Tensile strength ób/MPa
Elongation δ5 (%) ≥
Section shrinkage Ψ (%) ≥
Brinell hardness HBS≤
Y12
390～540
twenty two
36
170
Y12Pb
390～540
twenty two
36
170
Y15
390～540
twenty two
36
170
Y15Pb
390～540
twenty two
36
170
Y20
450 to 600
20
30
175
Y30
510-655
15
25
187
Y35
510-655
14
twenty two
187
Y40Mn
590～735
14
20
207
Y45ca
600～745
12
26
241
Note: For steels larger than 16 mm in diameter, the mechanical properties of steels measured from heat treated blanks
As follows: the grade is Y45Ca, the yield point is not less than 355MPa, the tensile strength is not less than 600MPa, the elongation ó5 is not less than 16%, the area shrinkage is not less than 40%, and the impact absorption work is not less than 39J.
Mechanical properties of free-cut structural steel cold drawn steel
Brand
Tensile strength ób/MPa
Elongation δ5 (%) ≥
Brinell hardness HBS
Steel size / mm
8~20
>20～30
>30
Y12
530～755
510-735
490～685
7.O
152~217
Y12Pb
530～755
510-735
490～685
7.0
152~217
Y15
530～755
510-735
490～685
7.O
152~217
Y15Pb
530～755
5lO～735
490～685
7.O
152~217
Y20
570～785
530～745
510-705
7.O
167~217
Y30
600～825
560～765
540～735
6.O
174~223
Y35
625~845
590～785
570～765
6.0
176~229
Y45Ca
695～920
655～855
635～835
6.O
196~255
Note: 1. The mechanical properties and Brinell hardness of high temperature tempering of Y40Mn cold drawn steel are as follows: tensile strength 590 ~ 785MPa; elongation 〥 5 not less than 17%; Brinell hardness HBSl79 ~ 229.
2. For steel wires with a diameter of less than 8 mm, the mechanical properties and Brinell hardness are negotiated between the supplier and the buyer.
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