ASME SA-351 Grade CF8 Cast steels

Alternative designations: 18Cr-8Ni
Material group: Ferrous Alloys / Cast steels
Country/Standard: United States / ASME

Data updates

Latest Update: 2024-02
Total number of updates: 4
Update History
2024-01 2023-11 2023-10

ASME SA-351 Grade CF8 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
≤ 0.08
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
18.0 – 21.0
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
≤ 1.50
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
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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

ASME Boiler and Pressure Vessel Code An International Code Section II - Part A Ferrous Material Specifications / American Society of Mechanical Engineers / 2025

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ASME SA-351 Grade CF8 Physical Properties

Temperature

≤ 0°C
0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Modulus of Elasticity val1
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GPa Unlock full details
Coefficient of Thermal Expansion (CTE) 15.3 10-6/°C Unlock full details
Thermal Conductivity 14.8 W/(m∙°C) Unlock full details

This material has 408 properties — only a subset is shown here.

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ASME SA-351 Grade CF8 Heat Treatments

  • Heated at 1040°C (1900°F), followed by quenching in water or rapid cooling by other means.

ASME SA-351 Grade CF8 Mechanical Properties

Temperature

0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Yield Strength, Rp0.2 205 MPa Unlock full details
Tensile Strength 485 MPa Unlock full details
Elongation, A 35 % Unlock full details

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  • 91 Cross References
  • 8 Composition
  • 38 Mechanical Properties
  • 80 Physical Properties
  • 1 Heat Treatment
  • - Metallography
  • - Machinability
  • 1 Stress-Strain
  • - Formability
  • - Fatigue
  • - Fracture
  • 142 Creep
  • - Joints
  • - Coatings
  • - Dimensions
  • - Tribology
  • - Corrosion
  • - Ageing
  • - Weatherability
  • - Irradiation
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