MIL 321 Stainless steels

Material group: Ferrous Alloys / Stainless steels
Country / Standard: United States / MIL

Data updates

Latest Update: 2022-03
Total number of updates: 4
Update History
2019-05 2014-10 2014-09

This material has 2086 properties — only a subset is shown here.

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MIL 321 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
≤ 0.0800
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
17.0000 – 20.0000
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Cu
VALUE
≤ 0.5000
UNIT
%
CAS NUMBER
7440-50-8
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
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
Ti
VALUE
val1
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UNIT
%
CAS NUMBER
7440-32-6

MIL-T-8973 / Tubing, steel, corrosion and heat resistant, for aerospace vehicle hydraulic systems assembled

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MIL 321 Physical Properties


Temperature

PROPERTY / VALUE
Modulus of Elasticity
188.1 — 215 GPa
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Thermal Conductivity
val1
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W/(m∙°C)
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Electrical Resistivity
val1
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Ω∙mm²/m
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Density
val1
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kg/dm³
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Electrical Conductivity
val1
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S/m
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Heat Capacity
val1
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J/(kg∙°C)
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Poisson Coefficient
val1
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Shear Modulus
val1
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GPa
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Coefficient of Thermal Expansion (CTE)
val1
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10-6/°C
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This material has 2086 properties — only a subset is shown here.

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MIL 321 Heat Treatments


  • Annealed: min. 1038°C (1900°F), rapidly cooled
  • Annealing: Heating 1750 to 2050°F; When stress relieving after welding is specified, hold for 1/2 hour minimum at specified temperature or holding for 2 hours at 1650°F +/- 25°F. Cooling: air or water quench.

MIL 321 Mechanical Properties


Temperature

PROPERTY / VALUE
Tensile Strength
≥ 517 MPa
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Brinell Hardness (HB)
≤ 187
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Elongation, A
val1
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%
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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
val1
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MPa
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MIL 321 International Equivalent Materials


Showing 4 of 70 results.

MATERIAL
STANDARD
COUNTRY / PRODUCER
EQUIVALENCE CATEGORY
MATERIAL
STANDARD
ASTM
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
STANDARD
ABS
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
STANDARD
IS
COUNTRY / PRODUCER
India
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
STANDARD
NMX
COUNTRY / PRODUCER
Mexico
EQUIVALENCE CATEGORY
Composition 100%

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

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  • 70Cross References

  • 30Composition
  • 189Mechanical Properties
  • 199Physical Properties
  • 4Heat Treatment
  • -Metallography
  • -Machinability

  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep

  • 8Joints
  • -Coatings
  • 2Dimensions
  • -Tribology

  • 1581Corrosion
  • 2Ageing
  • -Weatherability
  • -Irradiation

  • 1Total Suppliers