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Mavi Çelik Makina Metal San.Ve Tic.Ltd.Şti.
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Induction Hardened Steels

Induction hardening is used to obtain properties such as suitable core properties and high hardness depth that cannot be obtained by cementation. For example, induction hardening of parts requiring wear resistance of shafts that cannot be given much hardness due to high torque operation can be given as an example.

Although all tempered steels are induction hardenable, induction hardenable steels containing 0.30% – 0.70% carbon have better structural properties. Steels that can be hardened by induction can have a hardness of 50 – 60 HRC and the hardness transition between the surface and the core region is better than the tempered steels. The relatively high manganese content of tempered steels increases the risk of crack formation during induction hardening. For this reason, the amount of manganese in induction hardenable steels is reduced. While the manganese ratio of SAE 1050 material is between 0.60% and 0.90%, this ratio is 0.40% to 0.70% in Cf 53 material. In addition, the amount of sulfur and phosphorus is lower in these steels.

SURFACE HARDENABLE STEELS AND THEIR COMPOSITIONS BY INDUCTION
material no. RELIGION SAE / AISI NS NS mn Pmax Smax cr B.C Nmax V
1.1157 40 MN 4 1039 0.36-0.44 0.25-0.50 0.80-1.10 0.035 0.035 – – – –
1.1183 Cf 35 1035 0.33-0.39 0.15-0.35 0.50-0.80 0.025 0.035 – – – –
1.1193 Cf 45 1045 0.43-0.49 0.15-0.35 0.50-0.80 0.025 0.035 – – 0.007 –
1.1213 Cf 53 1050 0.50-0.57 0.15-0.35 0.40-0.70 0.025 0.035 – – – –
1.1249 Cf 70 – 0.68-0.75 0.15-0.35 0.20-0.35 0.025 0.035 – – 0.007 –
1.5122 37 MnSi 5 – 0.33-0.41 1.10-1.40 1.10-1.40 0.035 0.035 – – – –
1.7005 45 Cr 2 – 0.42-0.48 0.15-0.40 0.50-0.80 0.025 0.035 0.40-0.60 – – –
1.7043 38 Cr 4 – 0.34-0.40 0.15-0.40 0.60-0.90 0.025 0.035 0.90-1.20 – – –
1.7045 42 Cr 4 5140 0.38-0.44 0.15-0.40 0.50-0.80 0.025 0.035 0.90-1.20 – – –
1.7220 34CrMo 4 4135 0.30-0.37 0.00-0.40 0.60-0.90 0.035 0.030 0.90-1.20 0.15-0.30 – –
1.7223 41CrMo 4 4140 0.38-0.44 0.15-0.40 0.50-0.80 0.025 0.035 0.90-1.20 0.15-0.30 – –
1.7238 49CrMo 4 – 0.46-0.52 0.15-0.40 0.50-0.80 0.025 0.035 0.90-1.20 0.15-0.30 – –
1.8159 50 CrV 4 6150 0.47-0.55 0.00-0.40 0.70-1.10 0.035 0.030 0.90-1.20 – – 0.10-0.20
1.8161 58 CrV 4 – 0.55-0.62 0.15-0.40 0.70-1.10 0.035 0.035 0.90-1.20 – – 0.10-0.20

HEAT TREATMENT OF INDUCTION HARDENED STEELS
material no. RELIGION SAE / AISI Hot Figure. Temperature( °C ) Normal Annealing Temperature( °C ) Soft Annealing Temperature ( °C ) Core Hard. Cool For. Tempering Temperature( °C ) Surface Hard. Temperature( °C ) Stress Relief Temperature( °C ) Surface Hardness(HRC)
That Oil
( °C ) ( °C )
1.1157 40 MN 4 1039 1100-850 850-880 650-700 820-850 830-860 480-650 820-850 120-200 53-59
1.1183 Cf 35 1035 1100-850 860-890 650-700 840-870 850-880 550-660 860-890 120-200 51-57
1.1193 Cf 45 1045 1100-850 840-870 650-700 820-850 830-860 550-660 820-850 120-200 55-61
1.1213 Cf 53 1050 1050-850 830-860 650-700 805-835 810-845 550-660 800-830 120-200 57-62
1.1249 Cf 70 – 1000-800 820-850 650-700 790-820 – 550-660 780-810 120-200 60-64
1.5122 37 MnSi 5 – 1100-850 860-890 680-720 830-850 840-860 480-650 820-850 120-200 52-58
1.7005 45 Cr 2 – 1100-850 840-870 650-700 820-850 830-860 550-660 820-850 120-200 55-61
1.7043 38 Cr 4 – 1050-850 845-885 680-720 825-855 835-865 540-680 825-855 120-200 53-58
1.7045 42 Cr 4 5140 1050-850 840-880 680-720 820-850 830-860 540-680 820-850 120-200 54-60
1.7220 34CrMo 4 4135 1100-850 850-880 680-720 830-860 840-870 480-650 820-850 120-200 51-57
1.7223 41CrMo 4 4140 1050-850 840-880 680-720 820-850 830-860 540-680 820-850 120-200 54-60
1.7238 49CrMo 4 – 1050-850 840-880 680-720 820-850 830-860 540-680 820-850 120-200 56-62
1.8159 50 CrV 4 6150 1100-850 870-900 680-720 820-850 830-860 480-650 840-870 120-200 57-62
1.8161 58 CrV 4 – 1050-850 850-880 680-720 – 820-850 480-650 820-850 120-200 60-65

MECHANICAL PROPERTIES OF SURFACE HARDENABLE STEELS BY INDUCTION
material no. RELIGION SAE/AISI FLOW LIMIT (Re) ?Mpa TENSILE STRENGTH (Rm) Mpa

Elongation at Break (A) LO=5 D0

 SECTION CONTRACTING (Z) ?%

16MM

>16-

40MM

>40-

100MM

>100-

250MM

16MM

>16-

40MM

>40-

100MM

>100-

250MM

16MM

>16-

40MM

>40-

100MM

>100-

250MM

16MM

>16-

40MM

>40-

100MM

>100-

250MM

1.1157 40 MN 4 1039 635 540 440 880-1030 780-930 690-830 12 14 15 40 45 50
1.1183 Cf 35 1035 420 365 325 620-760 580-730 540-690 17 19 20 40 45 50
1.1193 Cf 45 1045 480 410 370 700-840 660-800 620-760 14 16 17 35 40 45
1.1213 Cf 53 1050 510 430 400 740-880 690-830 640-780 12 14 15 25 35 40
1.1249 Cf 70 – 560 480 780-930 740-880 11th 13 25 30
1.5122 37 MnSi 5 – 785 635 540 440 980-1180 880-1030 780-930 690-830 11th 12 14 15 35 40 45 50
1.7005 45 Cr 2 – 635 540 440 880-1080 780-930 690-830 12 14 15 40 45 50
1.7043 38 Cr 4 – 735 630 510 930-1130 830-980 740-880 11th 13 14 40 45 50
1.7045 42 Cr 4 5140 780 665 560 980-1180 880-1080 780-930 11th 12 14 40 45 50
1.7220 34CrMo 4 4135

800

650

550

500

980-1180

880-1030

780-930

690-830

 11th 12 14 15 40 45 55 60
1.7223 41CrMo 4 4140 885 765 635 510 1080-1270 980-1080 880-1030 740-930
1.7238 49CrMo 4 –

880

780

690

510

1080-1270

980-1080

880-1080

780-980

9

10

12

13

40

45

50

50

1.8159 50 CrV 4 6150

900

800

700

650

1100-1300

1000-1200

900-1100

850-1000

9

10

12

13

40

45

50

50

1.8161 58 CrV 4 –

1080

980

885

735

1320-1570

1180-1370

1080-1270

980-1180

7

8

10

12

40

45

50

55

JOMINY VALUES IN INDUCTION HARDENED STEELS
Steel Type HRC values from the instantly cooled surface (mm)
material no. RELIGION SAE/AISI 1.5 3 5 7 9 11th 13 15 20 25 30 35 40 45 50
1.7005 45 Cr 2 – max 62 60 57 52 46 42 40 38 35 33 31 29 28 27 26
min 54 49 40 32 28 25 23 22 20 – – – – – –
1.7043 38 Cr 4 – max 58 58 58 57 55 52 50 48 42 39 37 36 35 34 33
min 51 50 48 44 39 36 33 31 26 24 22 20 – – –
1.7045 42 Cr 4 5140 max 60 60 60 59 58 56 54 52 46 42 40 38 37 36 35
min 53 52 50 47 44 40 37 35 30 27 25 23 22 21 20
1.7223 41CrMo 4 4140 max 60 60 60 60 60 59 59 58 56 53 51 48 47 46 45
min 53 53 52 54 50 48 45 43 38 35 34 33 32 32 32
1.7238 49CrMo 4 – max 63 63 63 63 63 62 61 60 59 57 55 54 53 52 52
min 56 55 54 53 51 50 48 46 42 40 39 38 17 36 36

USAGE AREAS OF SURFACE HARDENABLE STEELS BY INDUCTION
material no. RELIGION SAE/AISI USAGE PLACES
1.1157 40 MN 4 Crankshafts, gear wheels, gearbox shafts and similar parts with high core strength and high ductility in vehicles and diesel engines
1.1183 Cf 35 1035 Machine elements with little difficulty in vehicles and general machine constructions
1.1193 Cf 45 1045 Camshaft and small crankshafts, gear wheels over 5 modules, transmission shaft, piston pin etc.
1.1213 Cf 53 1050 Piston pin, chain pin, transmission shaft, transmission gear, clutch levers, drill and lathe shafts etc.
1.1249 Cf 70 – Press rollers, worm gear shafts, camshaft, piston pin, drill and lathe spindle, prism and slot for balances
1.5122 37 MnSi 5 – A part with medium surface hardness, high core strength and good ductility, such as transmission parts, crankshaft, gear wheel.
1.7005 45 Cr 2 – In general machine constructions, gearbox shaft, coupling arm, gear wheel, pin, bushing in vehicles
1.7043 38 Cr 4 – Crankshaft, gear wheel, comb pin, parts in general machinery construction in vehicles and diesel engines
1.7045 42 Cr 4 5140 Crankshaft, gear wheel, comb pin, parts in general machinery construction in vehicles and diesel engines
1.7220 34CrMo 4 4135 Crankshafts, overstressed spherical pins, rear axle shafts, splined shafts and similar parts in vehicles
1.7223 41CrMo 4 4140 Crankshafts, overstressed spherical pins, rear axle shafts, splined shafts and similar parts in vehicles
1.7238 49CrMo 4 – High-strength parts, transmission shafts, gear wheels in vehicle and machinery construction
1.8159 50 CrV 4 6150 High core strength gear wheel, gearbox shaft and similar large parts
1.8161 58 CrV 4 – High core strength gear wheel, gearbox shaft and similar large parts
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