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Manufacturers
SHIMOMURA TOKUSHU SEIKO CO.,LTD. JOHOKU STEEL CO.,INC.
TOHOKU STEEL CO.,LTD. AKIYAMA SEIKO CO.,LTD.
SILVER ROD CO.,LTD. TAKASAGO TEKKO K.K.

Free-cutting carbon steels

JIS Manufacturer's
notation
Chemical compositions (%)
C Si Mn P S Pb Te
SUM24L ASK2600 0.15
max.
0.10
max.
0.85 to
1.15
0.04 to
0.09
0.26 to
0.35
0.25 to
0.35
-
SUM24L SDF ditto ditto ditto ditto ditto 0.15 to
0.35
-
SUM24L ASK2600S ditto ditto 0.85 to
1.25
ditto ditto 0.21 to
0.35
0.03 to
0.06
SUM24L TLS ditto ditto 0.75 to
1.25
ditto ditto 0.15 to
0.35
0.03 to
0.05
S45C - 0.42 to
0.48
0.15 to
0.35
0.60 to
0.90
0.030
max.
0.035
max.
0.10 to
0.30
-
Stainless steel bars and sheets

JIS C Si Mn P S Ni Cr Mo
SUS303 0.15
max.
1.00
max.
2.00
max.
0.20
max.
0.15
max.
8.00 to
10.00
17.00 to
19.00
-
SUS304 0.08
max.
ditto ditto 0.045
max.
0.030
max.
8.00 to
10.50
18.00 to
20.00
-
SUS316 ditto ditto ditto ditto ditto 10.00 to
14.00
16.00 to
18.00
2.00 to
3.00
SUS430 0.12
max.
0.75
max.
1.00
max.
0.040
max.
ditto - ditto -
SUS403 0.15
max.
0.50
max.
ditto ditto ditto - 11.50 to
13.00
-
SUS416 ditto 1.00
max.
1.25
max.
0.060
max.
0.15
min.
- 12.00 to
14.00
-
SUS420F 0.26~
0.40
ditto ditto ditto ditto - ditto -
SUS420J2 ditto ditto 1.00
max.
0.040
max.
0.030
max.
- ditto -
SUS440C 0.95 to
1.20
ditto ditto ditto ditto - 16.00 to
18.00
-
K-M Electromagnetic stainless steels

Steel type Major content added Features Shape
K-M 25F(Free cutting quality) 7Cr-2Si-Al Machinability Bar,Wire
K-M 31 13Cr-2Si Resistance for permanent in fatigue Bar,Wire
K-M 35F(Free cutting quality) 13Cr-1Si-Al Machinability, Cold heading quality Bar,Wire
K-M 35FL(Free cutting quality) 13Cr-1Si-Al(Low C) High magnetic property, Cold heading quality Bar,Wire
K-M 37F(Free cutting quality) 18Cr-1Si-Al Machinability, Corrosion resistance Bar,Wire
K-M 40F(Free cutting quality) 18Cr-Mo-Nb Machinability, Corrosion resistance Bar,Wire
K-M 38 18Cr-2Si-Mo Outstanding corrosion resistance Bar,Plate
Permalloy

JIS Ni
PB 40 to 50
PC 70 to 85
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