ASTM A 940 Grade LP Structural and constructional steels

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

Data updates

Latest Update: 2016-07
Total number of updates: 1
Update History

This material has 21 properties — only a subset is shown here.

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ASTM A 940 Grade LP Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
Al
VALUE
≤ 0.01
UNIT
%
CAS NUMBER
7429-90-5
CRITERIA
C
VALUE
0.23 – 0.30
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.90 – 1.50
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
Nb
VALUE
val1
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UNIT
%
CAS NUMBER
7440-03-1
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
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2

A940/A940M: 2006 / Standard Specification for Vacuum Treated Steel Forgings, Alloy, Differentially Heat Treated, for Turbine Rotors

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ASTM A 940 Grade LP 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 21 properties — only a subset is shown here.

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ASTM A 940 Grade LP Heat Treatments

  • For the high toughness LP portion, the heat treatment shall consist of water quenching (or water-spray quenching) and tempering. The final tempering temperature for all zones shall not be below 650°C. After heat treatment and subsequent rough machining and boring, the forging shall be stress relieved at a temperature not more than 55°C below the final tempering temperature, but not below 595°C.

ASTM A 940 Grade LP Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
725 — 860 MPa
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Elongation, A
≥ 17 %
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Impact Energy
val1
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J
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Reduction of Area
val1
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%
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Yield Strength, Rp0.2
≥ 585 MPa
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  • 1Cross References
  • 11Composition
  • 5Mechanical Properties
  • 3Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • -Total Suppliers