UNI X7CrNiAl17-7 Stainless steels

Material group: Ferrous Alloys / Stainless steels
Country/Standard: Italy / UNI

Data updates

Latest Update: 2024-03
Total number of updates: 7
Update History

This material has 678 properties — only a subset is shown here.

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UNI X7CrNiAl17-7 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
Al
VALUE
0.70 – 1.50
UNIT
%
CAS NUMBER
7429-90-5
CRITERIA
C
VALUE
≤ 0.09
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
16.0 – 18.0
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
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

EN 10088-2: 2024 / Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes

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UNI X7CrNiAl17-7 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 215 GPa
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Shear Modulus
val1
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GPa
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Density
val1
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kg/dm³
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Poisson Coefficient
val1
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Thermal Conductivity
16 W/(m∙°C)
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Heat Capacity
val1
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J/(kg∙°C)
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Electrical Resistivity
0.8 Ω∙mm²/m
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Electrical Conductivity
val1
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S/m
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This material has 678 properties — only a subset is shown here.

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UNI X7CrNiAl17-7 Heat Treatments

  • Delivery condition: Solution treated; 1025 ≤ T ≤ 1055°C for at least 30 min; air cooled (AC) or oil quenched (OQ).
    Use condition: Solution treated and precipitation hardened; 740 ≤ T ≤ 780°C for at least 90 min + cool to T ≤ 20°C within 1 h; hold for 30 min + 550 ≤ T ≤ 580°C for at least 90 min; air cool (AC).
  • Heat treated at 450-490°C; Duration: <= 1h; Air cooling; The optimum heat treatment conditions may be very different. The spring manufacturer shall choose those conditions answering the purpose; The heat treatment data refer to compression springs, torsion and tension (springs without initial tension).

UNI X7CrNiAl17-7 Mechanical Properties

Temperature

PROPERTY / VALUE
Yield Strength, Rp0.2
val1
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MPa
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Tensile Strength
500 — 2280 MPa
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Elongation, A
2 %
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Brinell Hardness (HB)
≤ 255
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Rockwell Hardness (HR)
val1
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Vickers Hardness (HV)
val1
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  • 242 Cross References
  • 74 Composition
  • 127 Mechanical Properties
  • 26 Physical Properties
  • 8 Heat Treatment
  • - Metallography
  • - Machinability
  • 3 Stress-Strain
  • 2 Formability
  • - Fatigue
  • - Fracture
  • - Creep
  • - Joints
  • - Coatings
  • 10 Dimensions
  • - Tribology
  • - Corrosion
  • - Ageing
  • - Weatherability
  • - Irradiation
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