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JIS G4502 Structural steels with Specified Hardenability Bands

 

Symbol

 

Chemical Composition
C Si Mn P S Ni Cr Mo
Mn SMn420H 0.16~0.23 0.15~0.35 1.15~1.55 0.030

Max

0.030

Max

 

 

 

 

 

0.250

Max

0.350

Max

SMn433H 0.29~0.36
SMn438H 0.34~0.41 1.30~1.70
SMn443H 0.39~0.46
Mn-Cr SMnC420H 0.16~0.23 1.15~1.55 0.350~0.70
SMnC443H 0.39~0.46 1.30~1.70
Cr SCr415H 0.12~0.18 0.55~0.95 0.85~1.25
SCr420H 0.17~0.23
SCr430H 0.27~0.34
SCr435H 0.32~0.39
SCr440H 0.37~0.44
Cr-Mo SCM415H 0.12~0.18 0.15~0.30
SCM418H 0.15~0.21
SCM420H 0.17~0.23
SCM425H 0.23~0.28
SCM435H 0.32~0.39 0.15~0.35
SCM440H 0.37~0.44
SCM445H 0.42~0.49
SCM822H 0.19~0.25 0.35~0.45
Ni-Cr SNC415H 0.11~0.18 0.30~0.70 1.95~2.50 0.20~0.55
SNC631H 0.26~0.35 2.45~3.00 0.55~1.05
SNC815H 0.11~0.18 2.95~3.50
Ni-Cr-Mo SNCM220H 0.17~0.23 0.60~0.95 0.35~0.75 0.35~0.65 0.15~0.30
SNCM420H 0.17~0.23 0.40~0.70 1.55~2.00