MIL S-23284A Class 2 Structural and constructional steels

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

Data updates

Latest Update: 2016-01
Total number of updates: 1
Update History

This material has 20 properties — only a subset is shown here.

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MIL S-23284A Class 2 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
≤ 0.2600
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
≤ 0.5000
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.1500 – 0.4500
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
P+S
VALUE
val1
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UNIT
%
CAS NUMBER
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

MIL-S-23284A: 1990 / Steel forgings, carbon and alloy, for shafts, sleeves, propeller nuts, couplings, and stocks (rudders and diving planes)

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MIL S-23284A Class 2 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 20 properties — only a subset is shown here.

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MIL S-23284A Class 2 Heat Treatments

  • The class shall be either normalized and tempered or quenched and tempered. For the quench and tempered condition, the forgings shall be normalized before heat treating (heating, quenching and tempering) for properties and, when necessary, stress relief annealed after tempering. Stress relief temperature: Unless otherwise specified, the stress relieving temperature shall be at least 10°C (50°F) below the tempering temperature and shall be not less than 566°C (1050°F). Cooling rate: stress relief shall be followed by furnace cooling to 315°C (600°F) under uniform conditions at an average rate not to exceed 83°C (150°F) per hour. The part may be cooled in still air when the temperature of the part is below 315°C (600°F).

MIL S-23284A Class 2 Mechanical Properties

Temperature

PROPERTY / VALUE
Yield Strength, Rp0.2
val1
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MPa
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Tensile Strength
551 — 689 MPa
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Elongation, A
22 %
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Reduction of Area
val1
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%
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Brinell Hardness (HB)
162 — 209
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  • - Cross References
  • 10 Composition
  • 6 Mechanical Properties
  • 3 Physical Properties
  • 1 Heat Treatment
  • - Metallography
  • - Machinability
  • - Stress-Strain
  • - Formability
  • - Fatigue
  • - Fracture
  • - Creep
  • - Joints
  • - Coatings
  • - Dimensions
  • - Tribology
  • - Corrosion
  • - Ageing
  • - Weatherability
  • - Irradiation
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