SA-574 4340 (United States / ASME) Material Properties

Alternative designations: 1 3/4Ni-3/4Cr-1/4Mo
Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: United States / ASME

Data updates

Latest Update: 2024-02
Total number of updates: 4
Update History:
2024-01 2023-12 2023-11

Mechanical Properties

Temperature

0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Yield Strength, Rp0.2 1055 MPa view details
Yield Strength, Rp0.2 val1
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MPa view details
Yield Strength, Rp0.2 val1
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MPa view details
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 1172 MPa view details
Tensile Strength val1
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MPa view details
Tensile Strength val1
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MPa view details
Tensile Strength val1
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Elongation, A 10 % view details
Rockwell Hardness (HR) val1
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Yield Strength, Rp0.2 153 ksi view details
Yield Strength, Rp0.2 val1
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ksi view details
Yield Strength, Rp0.2 val1
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ksi view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 170 ksi view details
Tensile Strength val1
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ksi view details
Tensile Strength val1
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ksi view details
Tensile Strength val1
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Elongation, A 10 % view details
Rockwell Hardness (HR) val1
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Physical Properties

Temperature

≤ 0°C
0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Modulus of Elasticity 197 — 204 GPa view details
Modulus of Elasticity val1
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GPa view details
Modulus of Elasticity val1
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GPa view details
Modulus of Elasticity val1
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GPa view details
Modulus of Elasticity val1
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GPa view details
Density 7.67 — 7.86 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
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Thermal Conductivity 36.3 W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Modulus of Elasticity 28.6 E+03 — 29.6 E+03 ksi view details
Modulus of Elasticity val1
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ksi view details
Modulus of Elasticity val1
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ksi view details
Modulus of Elasticity val1
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ksi view details
Modulus of Elasticity val1
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ksi view details
Density 0.277 — 0.284 lb/in³ view details
Poisson Coefficient val1
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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
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Thermal Conductivity 21 BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.36 – 0.45
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.67 – 0.93
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.57 – 0.83
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 / 2023

Heat Treatments

  • Screws shall be supplied heat treated by oil quenching from above the transformation temperature and then tempering at a temperature not lower than 343°C.