MIL Class 3 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 29 properties — only a subset is shown here.

Unlock full material properties, including detailed values across temperatures and conditions.

View Complete Material Data ›
Free registration required • Instant access

Free registration required • Instant access

MIL Class 3 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
Cr
VALUE
Non required, however if %Cr<=1.25, product analysis tolerance is ±0.15% and if %Cr>1.25 product analysis tolerance is ±0.25%
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Nb
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7440-03-1
CRITERIA
Ni
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
V
VALUE
val1
Full data available with free access View Complete Material Data
UNIT
%
CAS NUMBER
7440-62-2

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

Looking for full material performance data?

View Complete Material Data ›
Free registration required • Instant access

Free registration required • Instant access

MIL Class 3 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
Unlock full details
Full data available with free access View Complete Material Data
Density
7.67 — 7.86 kg/dm³
Unlock full details
Full data available with free access View Complete Material Data
Poisson Coefficient
0.27 — 0.3
Unlock full details
Full data available with free access View Complete Material Data

This material has 29 properties — only a subset is shown here.

Unlock detailed physical values across temperatures and conditions.

View Complete Material Data ›
Free registration required • Instant access

Free registration required • Instant access

MIL Class 3 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.

MIL Class 3 Mechanical Properties

Temperature

PROPERTY / VALUE
Brinell Hardness (HB)
210 — 380
Unlock full details
Full data available with free access View Complete Material Data

Need complete mechanical properties to make the right choice?

Get complete data on strength, hardness, fatigue, and more.

View Complete Material Data ›
Free registration required • Instant access

Free registration required • Instant access

Book A Demo

MIL Class 3 International Equivalent Materials

Showing 3 of 3 results.

MATERIAL
STANDARD
COUNTRY / PRODUCER
EQUIVALENCE CATEGORY
MATERIAL
Class 1
STANDARD
MIL
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
Class 2
STANDARD
MIL
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
Class 4b
STANDARD
MIL
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%

Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.

Need the full list of 3 international equivalents?

See all 3 equivalent grades with detailed mapping by standard, producer and equivalence category.

View All Equivalents ›
Free registration required • Instant access

Free registration required • Instant access

Book A Demo

Optimize material selection for your application - Book A Demo

  • 3Cross References
  • 11Composition
  • 6Mechanical Properties
  • 3Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • 1Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 4Total Suppliers