UNI 20 CrNi 4 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels
Country / Standard: Italy / UNI

Data updates

Latest Update: 2024-09
Total number of updates: 3
Update History
2019-08 2019-07

This material has 88 properties — only a subset is shown here.

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UNI 20 CrNi 4 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.18 – 0.23
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.90 – 1.20
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.80 – 1.10
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

UNI 7846: 1978 / Finished products in hot rolled unalloyed or special hardening alloyed steel bars and rolls. Quality, requirements and tests

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UNI 20 CrNi 4 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 88 properties — only a subset is shown here.

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UNI 20 CrNi 4 Heat Treatments

  • Hot worked at 1100-900°C; Cementation at 870-900°C; Core hardened at 850-880°C; Surface hardened at 810-840°C. Quenched in hot water bath; Stress relieved at 150-200°C.
  • 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). Spheroidise Annealed (Spheroidised). Annealed to obtained a lamellar ferrite and pearlite structure (Annealed). The H + T values shown in the mechanical properties table are obtained from an 11mm test bar hardened by oil quenching from 850°C +/- 10°C after holding at temperature for at least 30 minutes, and tempered at 180°C +/- 10°C for at least 1 hour. Final Heat Treatment: Case harden at 870 - 900°C. Harden the core by oil quenching from 850 - 880°C. Harden the case by oil quenching from 810 - 840°C. Finally, temper at 150 - 200°C.

UNI 20 CrNi 4 Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
835 — 1570 MPa
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Brinell Hardness (HB)
155 — 275
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Elongation, A
≥ 7.5 %
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Impact Energy
val1
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J
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Yield Strength, Rp0.2
val1
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MPa
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  • 3Cross References
  • 28Composition
  • 39Mechanical Properties
  • 3Physical Properties
  • 6Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • 2Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 7Total Suppliers