XC 18 (France / AFNOR NF) Material Properties

Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: France / AFNOR NF

Data updates

Latest Update: 2022-08
Total number of updates: 6
Update History:
2020-10 2020-05 2019-05 2017-08 2015-10

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 370 — 1270 MPa view details
Elongation, A 8 % view details
Impact Strength val1
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kJ/m² view details
Impact Energy val1
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J view details
Brinell Hardness (HB) 107 — 143 view details
Rockwell Hardness (HR) val1
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view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 53.7 — 184.2 ksi view details
Elongation, A 8 % view details
Impact Strength val1
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ft·lb/in² view details
Impact Energy val1
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ft·lb view details
Brinell Hardness (HB) 107 — 143 view details
Rockwell Hardness (HR) val1
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view details

Physical Properties

Temperature

0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Shear Modulus val1
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GPa view details
Density val1
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kg/dm³ view details
Poisson Coefficient val1
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Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Thermal Conductivity 58 W/(m∙°C) view details
Heat Capacity val1
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J/(kg∙°C) view details
Electrical Resistivity 0.11 Ω∙mm²/m view details
Modulus of Elasticity 27.6 E+03 — 30.5 E+03 ksi view details
Shear Modulus val1
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ksi view details
Density val1
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lb/in³ view details
Poisson Coefficient val1
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view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Thermal Conductivity 33.5 BTU/(h∙ft∙°F) view details
Heat Capacity val1
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BTU/(lb∙°F) view details
Electrical Resistivity 183 E-06 Ω∙circular·mil/ft view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.16 – 0.22
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Mn
VALUE
0.40 – 0.70
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
P
VALUE
≤ 0.035
UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3

NF A 35-551: 1986 / Case hardening steels - Technical delivery conditions

Heat Treatments

  • <b>Normalization</b> at 875 to 900°C<br> <b>Cementation process</b> at 880 to 930°C <br> <b>Hardening (core)</b> at 870 to 910°C, water quenching <br> <b>Hardening (surface)</b> at 770 to 810°C; water quenching <br> <b>Tempering</b> at 150 to 200°C.
  • <b>Normalized </b> at 875-900°C <br> <b> Heated </b> in the range at 865-895°C, cooled in water and <b>tempered </b> at 550-650°C <br>