Alloy Steels Scm440 2w4b50
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Gloria Material Technology Corp.
Alloy steels (SCM440) Similar steels
z
GMTC
JIS
SAE
SCM440
SCM440
4140
Chemical composition (wt%) Grade
C
Si
Mn
P
S
Cr
Mo
Ni
Cu
SCM440
0.38 0.43
0.15 0.35
0.60 0.85
Max. 0.030
Max. 0.030
0.90 1.20
0.15 0.30
Max. 0.25
Max. 0.30
SCM440H
0.37 0.44
0.15 0.35
0.55 0.90
Max. 0.030
Max. 0.030
0.85 1.25
0.15 0.30
Max. 0.25
Max. 0.30
z
Characteristics 1. Better tensile strength and percentage of elongation than chromium steels. 2. Combine with Cr and Mo, high hardenability, good resistance to tempered -softening. 3. Good strength and toughness。
z
Application Gear、shaft、screw、winch、nut、bobbin
z
Heat Treatment 1. Annealing— Heat to approx. 830℃, furnace cooling. 2. Normalizing : Heat to approx.830~880℃, air cooling. 3. Quench: (1) Heat to 840~870℃, oil cooling. 4. Tempering: Heat to approx. 550~650℃, water cooling.
GMTC G
R
O
U
P
1
z
Mechanical properties
Hardness HB Anneali Quench-Te ng mpering max.25 5 z
Impact Percentag Percentag Yield Tensile value e of e of area strength strength (charpy) 2 2 elongation reduction N/mm N/mm J/cm2 %
285-352
>830
>980
>12
>45
>59
Hardenability Curve
Temp.℃ mm Normali 1.5 3 5 7 9 11 13 15 20 25 30 35 40 45 50 Quench HRC zing Max. 60 60 60 59 58 58 57 56 55 53 51 49 47 46 44 870 845 Min. 53 53 52 51 50 48 46 43 38 35 33 33 32 31 30 Distance from quenched end (mm)
70
Hardness,HRC
60 50 40 30 20 10 0 1.5 3 5 7 9 11 13 15 20 25 30 35 40 45 50
Distance from quenched end,mm
z
Availability 1. Annealing、Spheroidizing and QT condition. 2. Available size range: φ660mm.
GMTC G
R
O
U
P
2
Alloy steels (SCM440) Similar steels
z
GMTC
JIS
SAE
SCM440
SCM440
4140
Chemical composition (wt%) Grade
C
Si
Mn
P
S
Cr
Mo
Ni
Cu
SCM440
0.38 0.43
0.15 0.35
0.60 0.85
Max. 0.030
Max. 0.030
0.90 1.20
0.15 0.30
Max. 0.25
Max. 0.30
SCM440H
0.37 0.44
0.15 0.35
0.55 0.90
Max. 0.030
Max. 0.030
0.85 1.25
0.15 0.30
Max. 0.25
Max. 0.30
z
Characteristics 1. Better tensile strength and percentage of elongation than chromium steels. 2. Combine with Cr and Mo, high hardenability, good resistance to tempered -softening. 3. Good strength and toughness。
z
Application Gear、shaft、screw、winch、nut、bobbin
z
Heat Treatment 1. Annealing— Heat to approx. 830℃, furnace cooling. 2. Normalizing : Heat to approx.830~880℃, air cooling. 3. Quench: (1) Heat to 840~870℃, oil cooling. 4. Tempering: Heat to approx. 550~650℃, water cooling.
GMTC G
R
O
U
P
1
z
Mechanical properties
Hardness HB Anneali Quench-Te ng mpering max.25 5 z
Impact Percentag Percentag Yield Tensile value e of e of area strength strength (charpy) 2 2 elongation reduction N/mm N/mm J/cm2 %
285-352
>830
>980
>12
>45
>59
Hardenability Curve
Temp.℃ mm Normali 1.5 3 5 7 9 11 13 15 20 25 30 35 40 45 50 Quench HRC zing Max. 60 60 60 59 58 58 57 56 55 53 51 49 47 46 44 870 845 Min. 53 53 52 51 50 48 46 43 38 35 33 33 32 31 30 Distance from quenched end (mm)
70
Hardness,HRC
60 50 40 30 20 10 0 1.5 3 5 7 9 11 13 15 20 25 30 35 40 45 50
Distance from quenched end,mm
z
Availability 1. Annealing、Spheroidizing and QT condition. 2. Available size range: φ660mm.
GMTC G
R
O
U
P
2
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