4150 AISI 4150 SAE 4150 Alloy Steel - SAE AISI 1010 1015 1020 1025 1045 1018 1117 1035 1040 1050 1215 4140 4150

Alloy Steel 4150

4140/4150 - Widely used general purpose alloys, low in cost. A broad range of strength and toughness is attainable through variations in heat treatment. Used for forging, tubing and fittings.AISI 4150 is notable for increased hardenability with a small tradeoff in machinability. Best strength and hardness appears in preheat-treated condition. Tailoring carbon content to bar size allows uniform physical attributes to be maintained across a variety of sizes. These are oil-hardening steel of relatively high hardenability. Their chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength.

These grades are especially suitable for forging because they have self-scaling characteristics. They respond readily to heat treatment and are comparatively easy to machine in the heat treated condition. They resist creep in temperature up to 1000°F and maintain their properties even after long exposure at these relatively high working temperatures. With a combination of such highly desirable properties as good strength and wear resistance, excellent toughness coupled with good ductility, and the ability to resist stress at elevated temperatures, it is widely used and highly successful alloy steel.

The following specifications are generally applicable for 4140/42 Heat Treated Rounds: ASTM A 193, Grade B7; ASTM A 434, Grades BC and BD. A special analysis of alloy steel which is heat treated by oil-quenching and tempering to develop a balance of mechanical properties. Has every requisite for brake die service-high wear-resistance, adequate toughness, high resistance to impact, and good machinability. In addition, the bars are stress-relieved before the final gag straightening, to insure a minimum of residual stresses.

This material is also available as leaded steel. The addition of lead improves machinability without sacrificing other desirable properties, with the exception that the use of this material is not recommended for applications over 400°F, since at elevated temperature ductility is low.

To obtain values for this property, specimens were taken from large and small sections, machined oversize, heat treated and finished by grinding to 0.505 in. diameter x 0.750 in. long. The specimens were checked for hardness and were then compressed between hardened steel plates. the specimens tested showed a hardness of 269 Brinell and indicated that both small and large sections developed compressive strength in excess of 100,000 psi, adequate compressive strength to meet the maximum demand of heavy duty brake-die service.

Principal Design Features
This is a higher carbon variation of the chromium, manganese, molybdenum 4100 series of low alloy steels.

Machinability
Machinability of 4150 is good in the annealed condition, or in the normalized condition. After heat treatment the alloy can be very hard and it is best to limit machining at that point to grinding.

Forming
Ductility and formability in the annealed condition is good. Forming after heat treatment is difficult.

Welding
The alloy may be welded by conventional methods. Welding the alloy in the hardened (heat treated) condition may affect the mechanical properties due to welding heat input. A post-weld heat treatment may be needed. Follow an approved weld procedure.

Heat Treatment
It is best to normalize the alloy at 1650°F before heat treatment. Then heat treat at 1500°F and water quench to harden the alloy.

Forging may be accomplished at 2200°F down to 1800°F.

Hot Working
The alloy can be hot worked in the range of 1900°F to 1600°F.

Cold Working
4150 may be cold worked by conventional methods with the alloy in the annealed condition. After heat treatment the alloy is very hard and difficult to work.

Annealing
Anneal at 1650°F and slow furnace cool.

Aging
Not applicable to this alloy.

Tempering
Temper at temperatures ranging from 400°F to 1200°F depending upon the hardness level desired. Higher tempering temperatures result in lower hardness values. For example tempering at 600°F gives a tensile strength of 255 ksi while tempering at 1000 F gives 170 ksi.

Hardening
See "Heat Treatment" and "Tempering" -- also hardens due to cold working.

Chemical Composition

Carbon

0.48 - 0.53

Chromium

0.8 - 1.1

Iron

Balance

Manganese

0.75 - 1

Molybdenum

0.15 - 0.25

Phosphorus

0.035 max

Silicon

0.15 - 0.35

Sulphur

0.04 max

Physical Properties

Density (lb / cu. in.)

0.284

Specific Gravity

7.8

Specific Heat (Btu/lb/Deg F - [32-212°F])

0.113

Melting Point (°F)

2600

Thermal Conductivity

Mean Coeff Thermal Expansion

Modulus of Elasticity Tension

Structural Steel Comparison Chart 1

Germany

China

England

France

Italy

Belgium

Swed

Spain

Japan

USA

Material No.

DIN

AFNOR

UNI

NBN

UNE

JIS

AISI

1.0401

C15

080M15

CC12

C15C16

1350

F.111

1015

1.0402

C22

050A20

CC20

C20C21

C25-1

1450

F.112

1020

1.0501

C35

060A35

CC35

C35

C35-1

1550

F.113

1035

1.0503

C45

080M40

CC45

C45

C45-1

1650

F.114

1045

1.0535

C55

070M55

C55

C55-1

1655

1055

1.0601

C60

080A62

43D

CC55

C60

C60-1

1060

1.7015

9SMn28

Y15

230M07

S250

CF9SMn28

1912

11SMn28

SUM22

1213

1.0718

9SMnPb28

S250Pb

CF9MnPb28

1914

11SMnPb28

SUM22L

12L13

1.0722

10SPb20

10PbF2

CF10Pb20

10SPb20

1.0726

35S20

212M36

35MF4

1957

F210G

1140

1.0736

9SMn36

Y13

240M07

S300

CF9SMn36

12SMn35

1215

1.0737

9SMnPb36

S300Pb

CF9SMnPb36

1926

12SMnP35

12L14

1.0904

55Si9

55Si2Mn

250A53

55S7

55Si8

55Si7

2085

56Si7

9255

1.0961

60SiCr7

60SC7

60SiCr8

9262

1.1141

Ck15

080M15

32C

XC12

C16

C16-2

1370

C15K

S15C

1015

1.1157

40Mn4

40Mn

150M36

35M5

1039

1.1158

Ck25

C25-2

S25C

1025

1.1167

36Mn5

35Mn2

40Mn5

2120

36Mn5

SMn438

1335

1.1170

28Mn6

30Mn

150M28

14A

20M5

C28Mn

28Mn6

SCMn1

1330

1.1183

Cf35

35Mn

060A35

XS38TS

C36

1572

S35C

1035

1.1191

Ck45

080M46

XC42

C45

C45-2

1672

C45K

S45C

1045

1.1203

Ck55

070M55

XC45

C50

C55-2

C55K

S55C

1055

1.1213

Cf53

060A52

XC48TS

C53

1674

S50C

1050

1.1221

Ck60

60Mn

080A62

43D

XC60

C60

C60-2

1678

S58C

1060

1.1274

Ck101

060A96

1870

SUP4

1095

1.3401

X120Mn12

Z120M12

X120M12

XG120Mn12

X120Mn12

SCMn
H/1

1.3505

100Cr6

Gr15
45Gr

534A99

100C6

100Cr6

2258

F.131

SUJ2

52100

1.5415

15Mo3

1501-240

15D3

16Mo3KW

16Mo3

2912

16Mo3

ASTM A20Gr.A

Structural Steel Comparison Table 2

Germany

China

England

France

Italy

Belgium

Swe

Spain

Material No.

DIN

AFNOR

UNI

NBN

UNE

1.5426

16Mo5

1503-245-420

16Mo5

1.5622

14Ni6

16N6

14Ni6

18Ni6

15Ni6

1.5662

X8Ni9

1501-509;510

X10Ni9

10Ni36

XBNi09

1.5680

12Ni19

Z18N5

12Ni20

1.5710

36NiCr6

640A35

111A

35NC6

1.5732

14NiCr10

14NC11

16NiCr11

15NiCr11

1.5752

14NiCr14

655M13;655A12

36A

12NC15

13NiCr12

1.6511

36CrNiMo4

816M40

110

40NCD3

38CrNiMo4

35CrNiMo4

1.6523

21NiCrMo2

850M20

362

20NCD2

20NiCrMo2

2503

20NiCrMo2

1.6546

40NiCrMo2

311-Type7

40NiCrMo2

1.6582

34CrNiMo6

40CrNiMoA

817M40

35NCD6

35CrNiMo6

2541

1.6587

17CrNiMo6

820A16

18NCD6

17CrNiMo7

14CrNiMo13

1.7015

15Cr3

15Cr

523M15

12C3

15Cr2

1.7033

34Cr4

35Cr

530A32

18B

32C4

34Cr4(KB)

34Cr4

35Cr4

1.7035

41Cr4

40Cr

530M40

42C4

41Cr4

42Cr4

1.7045

42Cr4

40Cr

2245

42Cr4

1.7131

16MnCr15

18CrMn

(527M20)

16MC5

16MnCr15

2511

16MnCr15

1.7176

55Cr3

20CrMn

527A60

55C3

55Cr3

1.7218

25CrMo4

30CrMn

1717CDS110

25CD4

25CrMo4

2225

55Cr3

1.7220

34CrMo4

35CrMo

708A37

19B

35CD4

35CrMo4

34CrMo4

2234

34CrMo4

1.7223

41CrMo4

40CrMoA

708M40

19A

42CD4TS

41CrMo4

2244

41CrMo4

1.7225

42CrMo4

42CrMo;
42CrMnMo

708M40

19A

42CD4

42CrMo4

2244

42CrMo4

1.7262

15CrMo5

12CD4

2216

12CrMo4

1.7335

13CrMo44

1501-620Gr.27

15CD3.5;
15CD4.5

14CrMo44

14CrMo45

1.7361

32CrMo12

722M24

40B

30CD12

32CrMo12

2240

F.124.A

1.7380

10CrMo910

1501-622Gr.31;45

12CD9;10

12CrMo9,10

2218

TU.H

1.7715

14MoV63

1503-660-440

13MoCrV6

1.8159

50CrV4

50CrVA

735A50

50CV4

50CrV4

2230

51CrV4

1.8509

41CrAlMo7

905M39

41B

40CAD6,12

41CrAlMo7

2940

41CrAlMo7

1.8523

39CrMoV139

897M39

40C

36CrMoV12

36CrMoV13