Grades, chemical compositions and mechanical properties of free-cutting structural steels Grades and chemical compositions of free-cutting structural steels

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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