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Carbon and Alloy Steel

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 1.10~1.40
 0.04~0.09 0.33~0.465 -  
1141 SUM42 0.37~0.45 1.35~1.65 0.03 max 0.08~0.13 - High-speed cutting materials, axial
1144 SUM43 0.40~0.48 1.35~1.65 0.03 max 0.24~0.33 -
Carbon Steel for Machine Structure Use JIS G4051
Mark Similar Specifications (AISI)
 Chemical Composition (%) Uses
C Si Mn P S
S15C 1015 0.13~0.18 0.15~0.35 0.30~0.60 0.03 max 0.035 max  
S18C 1018 0.15~0.20
 0.10 max 0.60~0.90 0.03 max 0.05 max  
S25C 1025
 0.22~0.28 0.15~0.35 0.30~0.60 0.03 max 0.035 max Axis, hand tools
S35C 1035 032~0.38
 0.15~0.35 0.60~0.90
 0.03 max 0.035 max
S45C 1045 0.42~0.48 0.15~0.35 0.60~0.90 0.03 max 0.035 max
S55C 1055 0.52~0.58 0.15~0.35 0.60~0.90 0.03 max 0.035 max
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 0.60~0.85 0.03 max 0.03 max 0.25 max
 0.90~1.20 0.15~0.30 For shafts, pistons, vehicle Parts with carburizing hardening surfaces
SCM420 0.18~0.23 0.15~0.35 0.60~0.85 0.03 max 0.03 max 0.25 max
 0.90~1.20 0.15~0.30
SCM435 0.33~0.38 0.15~0.35 0.60~0.85 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 0.60~0.85 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.

Structural Steels with Specified Harden ability Bands JIS G4052
Mark Chemical Composition (%) Uses
C Si Mn P S Ni Cr Mo
SCM415H 0.12~0.18 0.15~0.35 0.55~0.95 0.03 max 0.03 max 0.25 max
 0.85~1.25 0.15~0.30  
SCM420H 0.17~0.23 0.15~0.35 0.55~0.95 0.03 max 0.03 max 0.25 max
 0.85~1.25 0.15~0.30  
SCM435H 0.32~0.39 0.15~0.35 0.55~0.95 0.03 max 0.03 max 0.25 max
 0.85~1.25 0.15~0.30  
SCM440H 0.37~0.44 0.15~0.35 0.55~0.95 0.03 max 0.03 max 0.25 max
 0.85~1.25 0.15~0.30  

＊As impurities, Cu shall not exceed 0.30% in any steel of this table.

Click on the image to enlarge the table of contents　　

Bearing Steels JIS G4805
Mark Chemical Composition (%) Uses
C Si M P S Cr Mo Cu Ni
SUJ2 0.95~1.10 0.15~0.35 0.50max 0.025max 0.025max 1.30~1.60 0.08max
 0.20max 0.25max Bearings, rollers, balls
Tool Steels JIS G4401
Mark Chemical Composition (%) Uses
C Si Mn P S
SK4 0.90~1.00 0.10~0.35 0.10~0.50 0.03max 0.03max Mechanical axis, all kinds of precision parts
Carbon Tool Steels  
Mark Chemical Composition (%) Uses
C Si Mn P S Cu Ni Cr Pb
SK4F 0.90~1.00 0.35max 0.858max 0.03max 0.04~0.09 0.30max 0.20max
 0.20max 0.10~0.30  
Alloy Tool Steels JIS G4404
Mark Chemical Composition (%) Uses
C Si Mn P S Cr Mo V
SKD61 0.35~0.42 0.80~1.20 0.25~0.50 0.03max 0.02max 4.80~5.50
 1.00~1.50 0.80~1.15 Hot stamping, ejector pins

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