ASME SA-351 Grade CH20 Cast steels

Alternative designations: 25Cr-12Ni
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 CH20 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.04 – 0.20
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
22.0 – 26.0
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
≤ 1.50
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Ni
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
Full data available with free access View Complete Material Data
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

Looking for full material performance data?

View Complete Material Data ›

ASME SA-351 Grade CH20 Physical Properties

Temperature

0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Coefficient of Thermal Expansion (CTE) 14.7 10-6/°C Unlock full details
Thermal Conductivity 11.1 W/(m∙°C) Unlock full details

This material has 229 properties — only a subset is shown here.

Unlock full material properties, including detailed values across temperatures and conditions.

View Complete Material Data ›

ASME SA-351 Grade CH20 Heat Treatments

  • Heated at 1150°C (2100°F), followed by quenching in water or rapid cooling by other means.

ASME SA-351 Grade CH20 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 30 % Unlock full details

Mechanical properties are available with full access.

Get complete data on strength, hardness, fatigue, and more.

View Complete Material Data ›
  • 9 Cross References
  • 8 Composition
  • 38 Mechanical Properties
  • 63 Physical Properties
  • 1 Heat Treatment
  • - Metallography
  • - Machinability
  • - Stress-Strain
  • - Formability
  • - Fatigue
  • - Fracture
  • 104 Creep
  • - Joints
  • - Coatings
  • - Dimensions
  • - Tribology
  • - Corrosion
  • - Ageing
  • - Weatherability
  • - Irradiation
  • 6 Total Suppliers