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Free Cutting Material Series

Free Cutting Steels JIS G4804
Mark Similar
Specifications (JIS)		 Chemical Composition (%) Uses
C Mn P S Pb
12L14 SUM24L 0.15 max 0.85~1.15 0.04~0.09 0.26~0.35 0.10~0.35 Cutting Materials, General Accessory
1215 SUM23 0.09 max 0.75~1.05 0.04~0.09 0.26~0.35
 -
1215MS - 0.09 max 1.10~1.60
 0.04~0.09 0.33~0.42 -  
1141 SUM42 0.37~0.45 1.35~1.65 0.04 max 0.08~0.13   High-speed Cutting Materials, Axial
1144 SUM43 0.40~0.48 1.35~1.65 0.04 max 0.24~0.33 -
Low-Alloyed Steels For Machine Structure Use JIS G4053
Mark Chemical Composition (%) Uses
C Si Mn P S Ni Cr Mo
SCM415 0.13~0.18 0.15~0.35 0.60~0.90 0.03 max
 0.03 max 0.25 max 0.90~1.20 0.15~0.25 For shafts, Pistons, Vehicle Parts with Carburizing Hardening Surfaces
SCM420 0.18~0.23 0.15~0.35 0.60~0.90 0.03 max 0.03 max 0.25 max 0.90~1.20 0.15~0.25
SCM435 0.33~0.38 0.15~0.35 0.60~0.90 0.03 max 0.03 max 0.25 max 0.90~1.20 0.15~0.30 Screws, Bolts and Mechanical Parts
SCM440 0.38~0.43 0.15~0.35 0.60~0.90 0.03 max 0.03 max 0.25 max 0.90~1.20 0.15~0.30 Shaft, Vehicle Parts

To improve the machinability of carbon steel for machine structure use and low-alloy steel for machine structure use, steel production plants have added extra lead, sulfur, etc. Those with added lead are tagged with ~L1, ~L2 at the end of their material number. Those with added sulfur are tagged with ~S0, ~S1, ~S2 at the end of their material number. After addition, the ingredients have been slightly changed, see table below for details:

Grade Mark Chemical Composition (%)
Mn P S Pb
Less than the original Mn content's lower limit of 0.40% Higher than the original Mn content's lower limit of 0.40%
Lower Limit Upper Limit Lower Limit Upper Limit
~L1 － － － － － － 0.04~0.09
~L2 － － － － － － 0.10~0.30
~S0 － － － － － 0.015~0.035 －
~S1 +0.20 +0.30 +0.10 +0.20 － 0.04~0.07 －
~S2 +0.30 +0.40 +0.20 +0.30 0.040 or less 0.08~0.12 －

＊The Company’s L series products are mainly ~L2, e.g. SCM415L, SCM415S, SCM435L and SCM435S.

Stainless Steel  
Grade Chemical Composition (%) Remark
JIS AISI C Si Mn P S Ni Cr Mo Other
SUS303 303 0.15 max 1.00 max 2.00 max 0.20 max 0.15 min 8.00~10.00 17.00~19.00 0.60 max -  
SUS303Cu - 0.15 max 1.00 max 3.00 max 0.20 max 0.15 min 8.00~10.00 17.00~19.00 0.60 max Cu: 1.50~3.50  
SUS316F 316F 0.08 max 1.00 max 2.00 max 0.045 max 0.15 min 10.00~14.00 16.00~18.00 2.00~3.00 -  
SUS416 416 0.15 max 1.00 max 1.25 max 0.060 max 0.15 min 0.60 max 12.00~14.00 0.60 max -  
SUS430F 430F 0.12 max 1.00 max 1.25 max 0.060 max 0.15 min 0.60 max 16.00~18.00 0.60 max -  
Free Cutting Brass  
Alloy No. Chemical Composition (%) Features and uses
Cu Pb Fe Sn Zn
C3601 59.0-63.0 1.8-3.7 <0.3 Fe + Sn<0.5 REM Excellent Machinability and C3601, C3602 Good Extensibility too.
Uses: Computers, Electronics, Clocks, Pens, Lighting, Rivets, Nuts, Gears, Valves, Camera Parts, Hardware Parts.
C3602 59.0-63.0 1.8-3.7 <0.5 Fe + Sn<1.2 REM
C3603 57.0-61.0 1.8-3.7 <0.35 Fe + Sn<0.6 REM
C3604 57.0-61.0 1.8-3.7 <0.5 Fe + Sn<1.2 REM
C3771 57.0-61.0 1.0-2.5 Fe + Sn<1.0 REM Excellent hot forging. Uses: precision forging, machine parts.
Excellent hot forging and good machinability.
Uses: Valves, Watches and Machine Parts.

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