C20
C20 Equivalent grades:
Stocked Product
BS 970:1955
British Standards
European
Werksoff
SAE/AISI
Lesser
Greater
070M20 (070)
EN3A
EN32
080A15
C15
C20
ST52-3(ST5)
S235(S23)
S275(S27 & S28)
1.0402
1.0401
1.1151
1020
1023
–
LF2 (LF2)
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, OHNS, HCHCR, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
C20 Chemical composition:
The following table shows the chemical composition of C20 steel:
Element
C
Mn
Si
S
P
Content(%)
0.17-0.23
0.30-0.60
0.10-0.40
≤0.045
≤0.045
C20 Mechanical Properties:
MECHANICAL PROPERTIES
METRIC
IMPERIAL
Tensile strength
425 MPa
61600 psi
Yield strength
360 MPa
52200 psi
Shear modulus
80.0 GPa
11600 ksi
Bulk modulus
140 GPa
20300 ksi
Elastic modulus
190-210 GPa
27557-30458 ksi
Poisson’s ratio
0.27-0.30
0.27-0.30
Elongation at break
0.15
0.15
Reduction of area
0.4
0.4
Hardness Brinell
121
121
Hardness, Knoop
140
140
Hardness, Rockwell B
68
68
Hardness, Vickers
126
126
Machinability
65
65
C20 Hardness:
121
C20 Heat treatment:
When hardening C-20 heat treatment temperatures, including the rate of heating, cooling, and soaking times will vary due to factors such as the shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium, and workpiece transfer facilities.
C20 Hardening:
As a low carbon steel C-20 is not ideally suited for heat treatment (EN8 or EN9 may be a better-suited option). If hardening is required heat to a temperature of 880-910°C. Quench in water and temper.
C20 Tempering:
C20 Physical Properties:
Annealed hardness | HBS: 156 max.
Tensile strength,σb/≥ MPa: 400
Yield strength, σ0.2/≥ MPa: 270
Elongation, δ ≥(％): 27.0
Impact, ≥J /Akv: –
C20 Thermal Properties:
PROPERTIES
METRIC
IMPERIAL
Thermal conductivity
51.9 W/mK
360 BTU in/hr.ft².°F
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