Grade C45
Corresponding Standard ISO 683-1-1987
Heat-treatable steels,alloy steels and free-cutting steels. Part 1:Direct-hardening unalloyed and low-alloyed wrought steel in form of different black produts
Classification Carbon Steel
C45 Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 0.42 0.1 0.5 - -
Maximum Value 0.5 0.4 0.8 0.045 0.045
• The designations are in accordance with the system proposed by ISO/TC 17/SC 2.
• Elements not quoted should not be intentionally added to the steel without the agreement of the purchaser, other than for the purpose of finishing the heat. All reasonable precautions should be taken to prevent the addition, from scrap or other material used in manufacture, of such elements which affect the hardenability, mechanical properties and applicability.
• In the case of the grades with specified hardenability requirements (see tables 5 to 7), except for phosphorous and sulfur, insignificant deviations from the limits for cast analysis are permissible; these deviations shall, however, not exceed in the case of carbon ± 0,01 % (m/m) and in all other cases the values according to table 4.
• For boron-treated steels, see ISO 4954.
• Steels with improved machinability by either lead additions or higher sulfur levels up to about 0,100 % (m/m) S (including controlled sulfide morphology) may be available on request.
C45 Mechanical Properties
diameter
d
mm
Heat Treatment or Condition
Tensile Strength
σb
Mpa
Yield Point
σs
Mpa
Elongation or Extension Rate
δ
%
d≤16 Quenching + Tempering 700~850 ≥490 ≥14
16<d≤40 Quenching + Tempering 650~800 ≥430 ≥16
40<d≤100 Quenching + Tempering 630~780 ≥370 ≥17
1 Approximate Comparison Table Carbon Structural Steel and Engineering Steel
China Japan International Organization for Standardization European Standard
GB JIS ISO EN Numerical Grade
45 S45C C45 C45 1.0503
2 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 NF EN/NF EN Numerical Grade GOST SS BS EN/BS
45 S45C 1042
1045
Gr.1043
C45 C45 AF65C45
C45
C45 1.0503 45 1650 070M46
50HS
3 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization France Russia United Kingdom
GB JIS ASTM/AISI ISO NF EN/NF GOST BS EN/BS
GB/T 699-1999
45
S45C 1045 ISO 630-1:1987
C45
C45E4
C45M2
C45
XC45
45 060A42
060A47

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