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Grade S55C
Corresponding Standard JIS G 4051-2016
Carbon steels for machine structural use
Brand/Supplier
Japan -> NSSC
-> POSCO
-> BAOSTEEL
Classification Carbon Steel
S55C Chemical Element Composition Content (%)
  Component C Si Mn P S Cr Ni Cu More
本标准 Minimum Value 0.52 0.15 0.6 - - - - - Cr+Ni≤0.35
Maximum Value 0.58 0.35 0.9 0.03 0.035 0.2 0.2 0.3
  Component C Si Mn P S More
宝钢(热轧钢板) Minimum Value 0.52 0.15 0.6 - -  
Maximum Value 0.58 0.35 0.9 0.015 0.025
S55C Mechanical Properties
product form Heat Treatment or Condition
Hardness
HBW
Hot-rolled steel plate (Baosteel) Hot Rolling HV
≤280
Hot-rolled steel plate (Baosteel) Annealing HV
≤170
Hot-rolled steel plate (Baosteel) Water Quenching 800~880℃ HRC
≥55
Hot-rolled steel plate (Baosteel) Oil Quenching 810~880°C HRC
≥53
1 Approximate Comparison Table
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
55 U20552 S55C S55C SM55C 1055
(ASTM) 		G10550 C55E4 C55E
Ck55 		1.1203 C55E
XC55 		55 1665 C55E
070M55
2 Approximate Comparison Table
China Japan United States International Organization for Standardization Germany Sweden
YB GB ISC JIS ASTM/AISI ISO DIN EN/DIN W-Nr. SS
SM55 SM55 T10550 S55C 1055 C55E4 C55E 1.1203 1665
3 Approximate Comparison Table
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
C55 S55C 1055 C55
C55E4 		C55 AF70C55
C54 		C55 1.0535 50
55 		1655 070M55
50
En9
4 Approximate Comparison Table
Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
S55C 1055 C55E4 Ck55 XC54
XC55H1 		C55E 1.1203 55 070M55
5 Approximate Comparison Table
China Japan United States International Organization for Standardization France Russia United Kingdom
GB JIS ASTM/AISI ISO NF EN/NF GOST BS EN/BS
55
(GB/T 699-1999) 		S55C 1055 C55
C55E4
C55M2
(ISO 630-1:1987) 		C55
XC55 		55 060A57
070M55
6 Approximate Comparison Table
China Japan United States International Organization for Standardization European Standard
GB ISC JIS ASTM/AISI ISO EN Numerical Grade
55
(GB/T 699-2015) 		U20552 S55C
(JIS G4051:2005)
(JIS G3506:2004) 		1055
(ASTM A29/A29M:2005) 		C55E4
(ISO 683-18:1996) 		C55E
(EN 10083-1:1991+A1:1996)
(EN 10084:1998) 		1.1203
S55C Corresponding Standards(Same grade name, different standards)
1 JIS
S55C
2 JIS G 4051-2005
S55C
3 JIS G 4051-2016
S55C
4 Q/BQB 615-2009
S55C
5 Q/BQB 615-2018
S55C

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!