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Estimated Mechanical Properties and Machinability Ratings of Alloy Steel Bars(a)


Average Physical Properties of Alloy Steels
Alloy Steels

AISI
Number

Condition of Bar
Steel

Tensile
Strength
P.S.I.

Yeild
P.S.I.

%
Elongation
in 2"

%
Reduction
of Area

Brinell
Hardness

Rockwell
Hardness

Machinability
% of
B1112
CD

4142*

Hot Rolled Annealed
Cold Drawn Annealed
Heat Treated C.D.
1" Round Oil Quenched 1550° F., Tempered 1000° F
2" Round Oil Quenched 1550° F., Tempered 1000° F
3" Round Oil Quenched 1550° F., Tempered 1000° F

90/100,000
110/120,000
140/155,000
150/160,000

145/155,000

130/145,000

60/70,000
85/95,000
125/140,000
130/140,000

125/135,000

115/125,000

20/30
15/25
12/20
15/20

15/20

15/20

50/60
45/55
45/55
50/60

50/60

55/65

185/210
230/250
270/300
320/350

320/345

280/310

91/95B
20/25C
26/30C
34/37C

33/36C

28/32C

55
65
45

4147-50*

Hot Rolled Annealed
1" Round Oil Quenched 1525° F., Tempered 1000° F
3" Round Oil Quenched 1525° F., Tempered 1000° F
4" Round Oil Quenched 1525° F., Tempered 1000° F
5" Round Oil Quenched 1525° F., Tempered 1000° F

90/105,000
170/180,000

150/160,000

140/150,000

135/150,000

65/75,000
145/155,000

130/140,000

120/130,000

115/125,000

20/30
15/20

15/20

15/20

15/22

50/60
50/60

50/60

50/60

52/62

185/215
350/375

325/350

300/330

295/320

92/96B
37/39C

34/37C

31/35C

30/34C

52

E.T.D.®

Elevated Temperature Drawing

150,000 Min.

130,000 Min.

10/20

30/45

302 Min.

32C Min.


E.T.D.®

Elevated Temperature Drawing

180,000 Min.

165,000 Min.

5/10

20/40

363 Min.

38C Min.


4340

Hot Rolled Annealed
2" Round Oil Quenched 1550° F., Tempered 1000° F
3" Round Oil Quenched 1550° F., Tempered 1000° F
4" Round Oil Quenched 1550° F., Tempered 1000° F
5" Round Oil Quenched 1550° F., Tempered 1000° F
6" Round Oil Quenched 1550° F., Tempered 1000° F

100/120,000
175/190,000

170/180,000

160/170,000

145/160,000

140/150,000

70/90,000
155/170,000

140/155,000

135/145,000

125/135,000

120/130.000

15/25
12/18

12/20

12/20

10/15

10/15

40/50
48/55

45/50

40/50

40/50

40/50

220/250
370/400

350/375

330/360

300/330

240/320

20/25C
38/42C

36/39C

35/31C

31/36C

30/35C

45

4615

Natural Hot Rolled as Rolled
Cold Drawn
1" Round Carburized 1700° F.: Cool in box:
Reheat 1525° F., Oil Quenched-Core Properties

75/85,000
90/100,000
110/125,000

53/63,000
75/85,000
80/100,000

25/35
15/22
18/23

58/68
50/60
50/60

145/180
190/215
220/250

80/87B
91/96B
20/24C

50
55

4620

Natural Hot Rolled as Rolled
1" Round Corburized 1700° F.: Cool in box:
Reheat 1525° F., Oil Quenched-Core Properties

80/110,000
115/130,000

60/75,000
80/100,000

20/30
15/25

50/60
45/55

180/220
240/270


24/30C

50

4815

Natural Hot Rolled as Rolled
1" Round Carburized 1700° F.: Cool in box:
Reheat 1525° F., Oil Quenched-Core Properties

100/110,000
140/160.000

65/75,000
120/140,000

20/30
14/18

50/60
45/55

210/230
300/340

95/99B
33/38C

50

E52100

Hot Rolled Annealed
1" Round Oil Quenched 1500° F., Tempered 1000° F

100/110,000
180/195,000

75/85,000
65/180,000

20/25
10/15

50/60
35/45

210/235
375/415


40/43C

45

6150

Hot Rolled Annealed
1" Round Oil Quenched 1575° F., Tempered 1000° F

95/110,000
170/185,000

75/85,000
150/160,000

20/30
12/17

50/60
45/55

200/230
360/390

14/21C
38/41C

50

8620*

Natural Hot Rolled
Cold Drawn
1" Round Carburized 1700° F.: Cool in box:
Reheat 1550° F., Oil Quenched—Core Properties

80/95,000
90/105,000
120/135,000

55/65,000
65/80,000
90/110.000

18/25
15/25
15/20

45/60
40/50
40/50

160/200
185/215
285/350

85/95B
90/96B
28/40C

55
60/70

8642

Natural Hot Rolled
Hot Rolled Heat Treated
Cold Drawn Annealed
1' Round Oil Quenched 1550° F,, Tempered 1000° F
2' Round Oil Quenched 1550° F., Tempered 1000° F

90/120,000
125,000 Min.
100/110,000
150/160,000

130/145,000

50/70,000
105,000 Min.
90/100,000
130/140,000

105/115,000

15/25
16 Min.
13/20
15/20

15/20

35/50
50 Min.
40/50
50/55

50/60

210/260
260/320
195/220
325/345

285/310

17/27C
26/33
93/98B
34/37C

29/32C

50/55
45/50
65

8645

Natural Hot Rolled
Annealed Hot Rolled
2" Round Oil Quenched 1550° F., Tempered 1000° F
3" Round Oil Quenched 1550° F., Tempered 1000° F

105/125.000
100/110,000
140/150,000

130/140,000

55/75,000
50/60,000
110/125,000

105/115,000

15/25
20/25
15/20

15/20

35/50
40/55
45/55

50/60

220/270
210/230
300/320

285/310

20/28C
17/21C
30/34C

29/32C

48/55
54

8742

Natural Hot Rolled
Cold Drawn Annealed
1" Round Oil Quenched 1550° F., Tempered 1000° F
2" Round Oil Quenched 1550° F., Tempered 1000° F

110/125,000
105/120,000
155/165,000

135/145,000

50/70,000
95/105,000
135/145,000

110/120,000

15/25
10/18
15/20

15/20

35/50
35/45
45/52

50/60

230/270
210/235
330/355

290/320

22/28C
95/99B
35/38C

30/33C

45/55
60

*With the addition of .15/.35 per cent Lead to these alloys, mechanical properties are not appreciably affected. Machinability, however, is improved approximately 25 per cent.