Representation of steel grades in South Korea

KS (Korean standard) is the code of Korean national standard. Since most of KS steel standards refer to Japanese JIS standard, the representation method of steel brand is basically the same as that of Japanese JIS standard. Some steel grades are only changed in the letter or order of brand number, while some are even the same as Japanese JIS standard. The brand is even the same. See table 1-23 for the substitutions of grades and the types of steel.
Brand letter
Types of steel
Brand letter
Types of steel
S ×× C
Carbon structural steel
SKH
High speed tool steel
SMn
Manganese structural steel
STS
stainless steel
SCr
Chromium structural steel
STR
Heat resistant steel
SCM
Cr Mo structural steel
SC
Carbon cast steel
SNC
Ni Cr Mo structural steel
SCS
Heat resistant cast steel
SNCM
Ni Cr Mo structural steel
SCH
High manganese cast steel
SUM
Free cutting structural steel
SCMnH
High manganese cast steel
SPS
Spring steel
SCPH ①
Cast Jinshan (iron) with high temperature and high temperature
STB
Bearing steel
SCPL
Low temperature high cast steel
STD(F)
Alloy tool steel
GCD
Nodular cast iron
STC
Carbon steel
MC
malleable iron
① Scph is not only the code of high temperature and high pressure cast steel, but also the code of high temperature and high pressure natural iron. However, when the steel grade is composed, the tail of cast steel is only a numerical number, while the tail of cast iron grade is added with the letter “CF”, such as scph21-cf.