A 470 Grade C Class 7 (United States / ASTM) Material Properties

Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: United States / ASTM

Data updates

Latest Update: 2020-07
Total number of updates: 2
Update History:
2015-05

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 690 MPa view details
Tensile Strength 825 — 930 MPa view details
Elongation, A 18 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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J view details
Yield Strength, Rp0.2 100.1 ksi view details
Tensile Strength 119.7 — 134.9 ksi view details
Elongation, A 18 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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ft·lb view details

Physical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Density 7.67 — 7.86 kg/dm³ view details
Poisson Coefficient 0.27 — 0.3 view details
Modulus of Elasticity 27.6 E+03 — 30.5 E+03 ksi view details
Density 0.277 — 0.284 lb/in³ view details
Poisson Coefficient 0.27 — 0.3 view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
Al
VALUE
≤ 0.015
UNIT
%
CAS NUMBER
7429-90-5
CRITERIA
C
VALUE
≤ 0.28
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
1.25 – 2.00
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
val1
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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
Sb
VALUE
val1
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UNIT
%
CAS NUMBER
7440-36-0
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2

A470/A470M: 2005 / Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts

Heat Treatments

  • The heat treatment for mechanical properties shall consist of normalizing, quenching, and tempering. In normalizing treatments, the forging may be cooled in still air or in an air blast at the manufacturer’s option. The final tempering temperature shall be not less than 580°C (1075°F).<br>After heat treatment and subsequent rough machining and axial boring, the forging shall be stress-relieved at a temperature not more than 55°C (100°F) below the final tempering temperature, but not less than 550°C (1025°F).<br>Heat treatment for mechanical properties shall be performed with the forging in the vertical position.