Grade 15
Corresponding Standard GB /T 17107-1997
Structural Steel Grades And Mechanical Property For Forgings
Classification Carbon Steel
15 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.12 0.17 0.35 - - - - -
Maximum Value 0.19 0.37 0.65 0.035 0.035 0.25 0.25 0.25
• High-quality steel——P≤0.035;S≤0.035;Cu≤0.3;Cr≤0.3;Ni≤0.3
• Extra-quality steel (Suffix A)——P≤0.025;S≤0.025;Cu≤0.25;Cr≤0.3;Ni≤0.3
• Special High-Quality Steel (Suffix E)——P≤0.025;S≤0.015;Cu≤0.25;Cr≤0.3;Ni≤0.3
• Cu is not more than 0.3% when smelting scrap steel
15 Mechanical Properties
diameter or thickness
d
mm
Mark
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Reduction of Area
ψ
%
Hardness
HBW
Impact Energy Absorption
KV2
J
d≤100 Sample Direction: Longitudinal Normalizing + tempering ≥320 ≥195 ≥27 ≥55 97~143 ≥47
100<d≤300 Sample Direction: Longitudinal Normalizing + tempering ≥310 ≥165 ≥25 ≥50 97~143 ≥47
300<d≤500 Sample Direction: Longitudinal Normalizing + tempering ≥300 ≥145 ≥24 ≥45 97~143 ≥43
• The forgings must be inspected for mechanical properties after performance heat treatment and before any surface treatment.
• After the samples are removed, no heat treatments that affect the mechanical properties or any processing that influences the test results shall be conducted.
• Mechanical property testing primarily evaluates the material\'s tensile strength, impact resistance, and hardness. When conducting tensile, impact, and hardness tests simultaneously, the hardness value is for reference only. Alternatively, one may choose to perform only one of the tensile, impact, or hardness tests.
1 Approximate Comparison Table High-Quality Carbon Structural Steel
China Taiwan, China Japan South Korea United States Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
15 U20152 S15C S15C SM15C 1015 G10150 C15
Ck15
1.0401
1.1141
C12
XC15
15 1350
1370
040A15
080M15
2 Approximate Comparison Table High-Quality Carbon Structural Steel
China Germany France European Standard
GB DIN EN/DIN NF EN/NF EN Numerical Grade
15 C15
Ck15
XC12 C15 1.0401
3 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
15 S15C Gr.1015
Gr.1016
C15E4 C15
Ck15
1.1141 C18RR
XC12
XC15
C15E 1.1141 15 1370 040A15
080M15
CS17
4 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States France Russia United Kingdom
GB JIS ASTM/AISI NF EN/NF GOST BS EN/BS
15 S15C
S15CK
1015 C15
XC15
15 040A15
050A15
060A15
5 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB JIS KS ASTM/AISI ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
15 S15C STKM12B 1015 C15E4 C15C 1.0234 C15C 15 C15C

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