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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 Quenchedâ€”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.