Grade 15
China ISC U20152
Corresponding Standard GB /T 699-1999
Quality Carbon Structural Steels
Classification Carbon Steel
Properties Impact Toughness Machinability Weldability
15 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.12 0.17 0.35 - - - - -
Maximum Value 0.18 0.37 0.65 0.035 0.035 0.25 0.3 0.25
① The grades listed in the table are of high quality steel. High quality steel, in the grade suffix A, the last digit of the unified digital code is changed to 3; Super high quality steel, in the grade suffix E, the last digit of the unified digital code is changed to 6; The rimming steel, grade suffix F, the last digit of the unified digital code is changed to 0; Semi-killed steel, grade suffix b, unified number code last digit is 1
qulity steel P≤0.035%,S≤0.035%
high qulity steel P≤0.035%,S≤0.035%
speicial high qulity steel P≤0.025%,S≤0.020%
② 08 steel with aluminum deoxidation smelting killed steel, the lower limit of manganese content is 0.25%, silicon content is not more than 0.03%, aluminum content is 0.02%~0.07%, this time the steel grade is 08Al
③ Upon agreement between supply and demand parties, 08~25 steel can be supplied as semi-killed steel with silicon content not exceeding 0.17%, with the grade designations of 08b~25b.
④ Steel produced from scrap metal may have a copper content of no more than 0.30%; the copper content in steel for hot-pressure processing should not exceed 0.20%.
⑤ The silicon content of the rimming steels which used for cold pressing shall be not more
than 0.03%.
⑥ Steel produced by oxygen converter process should have a nitrogen content of no more than 0.008%.
15 Mechanical Properties
diameter(thickness)
d
mm
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
Hardness
HBW
d=25 (sample size) Normalizing ≥375 ≥225 ≥27 Unprocessed Steel
≤143
① For steel with a diameter or thickness of less than 25mm, heat treatment is performed on a sample blank with the same cross-section size as the finished product
② Table normalizing recommended holding time is not less than 30min, air cooling; The recommended holding time for quenching is not less than 30min,70, 80 and 85 steel oil cooling, and the other steel water cooling; The recommended holding time for tempering is not less than 1h.
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

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