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Comparison Of Hardness

   

STRUCTURAL CARBON STEELS SC GRADE

 

 

MATERIALS

GRADE

CHEMICAL COMPOSITION %

C

Si

Mn

P

S

S10C

0.08~0.13

0.15~0.35

0.30~0.60

0.030

0.035

S12C

S15C

0.10~0.15

0.13~0.18

0.15~0.35

0.30~0.60

0.030

0.035

S17C

S20C

0.15~0.20

0.18~0.23

0.15~0.35

0.30~0.60

0.030

0.035

S22C

S25C

0.20~0.25

0.22~0.28

0.15~0.35

0.30~0.60

0.030

0.035

S28C

S30C

0.25~0.31

0.27~0.33

0.15~0.35

0.30~0.90

0.030

0.035

S33C

S35C

0.30~0.36

0.32~0.38

0.15~0.35

0.30~0.90

0.030

0.035

S38C

S40C

0.35~0.41

0.37~0.43

0.15~0.35

0.30~0.90

0.030

0.035

S43C

S45C

O.40~0.46

0.42~0.48

0.15~0.35

0.30~0.90

0.030

0.035

S48C

S50C

0.45~0.51

0.47~0.53

0.15~0.35

0.30~0.90

0.030

0.035

S53C

S55C

0.50~0.56

0.52~0.58

0.15~0.35

0.30~0.90

0.030

0.035

S58C

0.55~0.61

0.15~0.35

0.30~0.90

0.030

0.035

S09CK

0.07~0.12

0.15~0.35

0.30~0.60

0.025

0.025

S15CK

0.13~0.18

0.15~0.35

0.30~0.60

0.025

0.025

S20CK

0.18~0.23

0.15~0.35

0.30~0.60

0.025

0.025

HEAT TREATMENT

HEAT TREATMENT

MATERIALS

GRADE

NORMALIZING

ANNEALING

quench

TEMPER

S10C

900~950 Air cooled

ab. 900 Furnace cooled

 

 

S12C

S15C

880~930 Air cooled

ab. 880 Furnace cooled

 

 

S17C

S20C

870~920 Air cooled

ab. 860 Furnace cooled

 

 

S22C

S25C

860~910 Air cooled

ab. 850 Furnace cooled

 

 

S28C

S30C

850~900 Air cooled

ab. 840 Furnace cooled

850~900

Water quench

550~650

Rapidly cooled

S33C

S35C

840~890 Air cooled

ab. 830 Furnace cooled

840~890

Water quench

550~650

Rapidly cooled

S38C

S40C

830~880 Air cooled

ab. 820 Furnace cooled

830~880

Water quench

550~650

Rapidly cooled

S43C

S45C

820~870 Air cooled

ab. 810 Furnace cooled

820~870

Water quench

550~650

Rapidly cooled

S48C

S50C

810~860 Air cooled

ab. 800 Furnace cooled

810~860

Water quench

550~650

Rapidly cooled

S53C

S55C

800~850 Air cooled

ab. 790 Furnace cooled

800~850

Water quench

550~650

Rapidly cooled

S58C

800~850 Air cooled

ab. 790 Furnace cooled

800~850

Water quench

550~650

Rapidly cooled

S09CK

900~950 Air cooled

ab. 900 Furnace cooled

1st. 880~920

Oil (Water) quench

2nd. 750~800  Water quench

150~200

Air cooled

S15CK

880~930 Air cooled

ab. 880 Furnace cooled

1st. 870~920

Oil (Water) quench

2nd. 750~800   Water quench

150~200

Air cooled

S20CK

870~920 Air cooled

ab. 860 Furnace cooled

1st. 870~920

Oil (Water) quench

2nd. 750~800   Water quench

150~200

Air cooled


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