UNI 35 CrMo 4 F Structural and constructional steels

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

Data updates

Latest Update: 2020-10
Total number of updates: 2
Update History
2019-08

This material has 39 properties — only a subset is shown here.

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UNI 35 CrMo 4 F Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.30 – 0.37
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.90 – 1.20
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.50 – 0.80
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 6929: 1971 / Aircraft metallic materials. Hardening and tempering alloyed steel, weldable (C 0,35%, Cr 1,0% and Mo 0,20%)

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UNI 35 CrMo 4 F Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Electrical Resistivity
0.22 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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Poisson Coefficient
val1
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This material has 39 properties — only a subset is shown here.

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UNI 35 CrMo 4 F Heat Treatments

  • The values contained in the mechanical properties table for the hardened and tempered (H+T) condition apply to cold drawn wire and to hot rolled or cold drawn bar, heat treated as follows: Harden by oil quenching from 840 to 860°C, followed by tempering at 580 to 620°C for one hour. The same heat treatment shall be used for sheet, strip and seamless tube test specimens in the hardened and tempered condition, giving the mechanical property values shown in the specification. Guideline Heat Treatments are as follows: Annealing: Heat to 680 - 720°C, hold at temperature for a sufficient time to complete transformation, then slow cool in the furnace (approximately 50°C/hour) to 500°C or below, followed by cooling to room temperature in still air. Normalizing: Heat to 880 - 900°C, hold at temperature for a minimum of 2 hours, then cool in still air. Final Heat Treatment: Harden by oil quenching from 840 - 860°C, followed by tempering at a temperature in the range 400 - 650°C to achieve the desired mechanical properties, using the graphs of tempering temperatures versus mechanical properties contained within the specification for assistance. However, to avoid an unacceptable reduction of toughness, tempering should not be carried out within the range 250 - 400°C.

UNI 35 CrMo 4 F Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
883 — 1079 MPa
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Brinell Hardness (HB)
≥ 217
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Elongation, A
≥ 11 %
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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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  • 1Cross References
  • 8Composition
  • 11Mechanical Properties
  • 16Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • 2Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • -Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
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