MIL Class 4a Structural and constructional steels

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

Data updates

Latest Update: 2025-07
Total number of updates: 2
Update History
2014-09

This material has 22 properties — only a subset is shown here.

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MIL Class 4a Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
B
VALUE
When the amount of B is specified in the alloy, its content as determined by heat analysis shall not exceed 0.003%.
UNIT
%
CAS NUMBER
7440-42-8
CRITERIA
C
VALUE
≤ 0.30
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
CEV
VALUE
≤ 0.7000
UNIT
%
CAS NUMBER
CRITERIA
Cr
VALUE
val1
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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

MIL-DTL-12560K: 2013 / Armor plate, steel, wrought, homogeneous (for use in combat-vehicles and for ammunition testing)

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MIL Class 4a 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 22 properties — only a subset is shown here.

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MIL Class 4a Heat Treatments

  • The austenitizing temperature for production plates may vary within a range of 50° above the temperature used for test plates, but in no case shall the plate surface exceed 1800°F (982°C). Stress relieving the plates, local or general, shall be allowed after final quenching and tempering at a maximum temperature of 50°F (10°C) below the tempering temperature. Plates shall not be stress relieved in a temperature range of 500-700°F(260-371°C). After stress relieving, the plates shall be tested for hardness.

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  • 3Cross References
  • 12Composition
  • -Mechanical Properties
  • 3Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • 1Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
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