UNI 45 Cr 2 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels
Country / Standard: Italy / UNI
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This material has 44 properties — only a subset is shown here.

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UNI 45 Cr 2 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.42 – 0.48
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.40 – 0.60
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.50 – 0.80
UNIT
%
CAS NUMBER
7439-96-5
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

UNI 7847: 1979 / Hot rolled, unalloyed and alloyed special steel products, bars and coils, for surface hardening. Qualities, requirements and tests

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UNI 45 Cr 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 44 properties — only a subset is shown here.

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UNI 45 Cr 2 Heat Treatments

  • Material is normally supplied in the annealed or normalised condition. The values shown in the mechanical properties table apply to the following conditions: TC: Annealed. TD: Normalised. TF: Hardened and tempered. Spheroidised: Spheroidise annealed. Heat treated: Normalised or hardened and tempered followed by surface hardening followed by stress relieving at 140 to 180°C for one hour (to achieve the minimum surface hardness value specified after flame or induction hardening followed by stress relieving). Anneal at 680 - 720°C. Normalise at 850 - 890°C. Harden from 830 - 870°C and temper at 550 - 660°C for at least 1 hour.
  • Material is normally supplied in the hot rolled condition but, subject to agreement, may be supplied in one of the following conditions: Soft Annealed (SA) to a maximum hardness by annealing at 680 - 720°C. Spheroidise Annealed (Spheroidised). Hardened and Tempered (H+T). The H+T values shown in the mechanical properties table are obtained from a test piece hardened by oil quenching from 830 - 850°C followed by tempering at 550 - 650°C for at least 1 hour. The temperature of the oil must be between 15 - 60°C. The Rockwell C Scale hardness minimum value (Heat Treated condition) shown in the mechanical properties table is the surface hardness which must be obtained whether material is in the normalised condition and subsequently surface hardened or whether the material is in the hardened and tempered condition and subsequently surface hardened; Both treatments are followed by tempering at 140-180°C for approximately 1 hour. The specification gives a normalising treatment of 840 - 870°C.

UNI 45 Cr 2 Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
880 — 1080 MPa
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Brinell Hardness (HB)
≤ 235
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Elongation, A
≥ 12 %
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Impact Energy
val1
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J
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Rockwell Hardness (HR)
val1
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Yield Strength, Rp0.2
val1
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MPa
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  • 8Cross References
  • 12Composition
  • 14Mechanical Properties
  • 3Physical Properties
  • 4Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 3Total Suppliers