ASTM A 470 Grade C Class 7 Structural and constructional steels

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

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ASTM A 470 Grade C Class 7 Chemical 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

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ASTM A 470 Grade C Class 7 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Density
7.67 — 7.86 kg/dm³
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Poisson Coefficient
0.27 — 0.3
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This material has 30 properties — only a subset is shown here.

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ASTM A 470 Grade C Class 7 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).
    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).
    Heat treatment for mechanical properties shall be performed with the forging in the vertical position.

ASTM A 470 Grade C Class 7 Mechanical Properties

Temperature

PROPERTY / VALUE
Yield Strength, Rp0.2
690 MPa
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Tensile Strength
825 — 930 MPa
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Elongation, A
18 %
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Reduction of Area
val1
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%
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Impact Energy
val1
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J
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  • 10 Cross References
  • 11 Composition
  • 5 Mechanical Properties
  • 3 Physical Properties
  • 1 Heat Treatment
  • - Metallography
  • - Machinability
  • - Stress-Strain
  • - Formability
  • - Fatigue
  • - Fracture
  • - Creep
  • - Joints
  • - Coatings
  • - Dimensions
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