UNI 18 CrMoSi 4 KG Structural and constructional steels

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

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This material has 28 properties — only a subset is shown here.

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UNI 18 CrMoSi 4 KG Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
≤ 0.20
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
1.00 – 1.50
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.40 – 0.70
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
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 7660: 1977 / Forged finished steel products for pressure vessels. Qualities, requirements and tests

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UNI 18 CrMoSi 4 KG 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 28 properties — only a subset is shown here.

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UNI 18 CrMoSi 4 KG Heat Treatments


  • The specification contains the following heat treatment: Material with a maximum diameter or thickness of 250mm shall be quench hardened and tempered (Q+T) as follows: Harden by oil or water quenching from 900 - 950°C, then temper at 620 - 720°C and air or furnace cool.

UNI 18 CrMoSi 4 KG Mechanical Properties


Temperature

PROPERTY / VALUE
Tensile Strength
640 — 780 MPa
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Brinell Hardness (HB)
≤ 250
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Elongation, A
≥ 12 %
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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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  • 7Cross References

  • 7Composition
  • 10Mechanical Properties
  • 3Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability

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

  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology

  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation

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