UNI 25 CrMo 4 F Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country / Standard: Italy / UNI

Indicative price:

Data updates

Latest Update: 2020-10

Total number of updates: 2

Update History

2016-02

This material has 108 properties — only a subset is shown here.

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UNI 25 CrMo 4 F Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.22 – 0.29

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

0.90 – 1.20

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

0.50 – 0.80

UNIT

CAS NUMBER

7439-96-5

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-98-7

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-02-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7723-14-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7704-34-9

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

UNI 6928: 1971 / Aircraft metallic materials. Hardening and tempering alloyed steel weldable (C 0,25%, Cr 1,0%, and Mo 0,20%)

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UNI 25 CrMo 4 F Physical Properties

Temperature

0 - 30°C 30 - 100°C 100 - 300°C ≥ 300°C

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 kg/dm³

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Electrical Conductivity

val1 S/m

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Poisson Coefficient

val1

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This material has 108 properties — only a subset is shown here.

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UNI 25 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 bar and cold drawn bar, heat treated as follows: Harden by oil quenching from 860 to 880°C or water quenching from 830 to 850°C, followed by tempering at 580 to 620°C for one hour. Other values are shown in the specification for sheet, strip and seamless tubes in the hardened and tempered condition, heat treated as follows: Harden by oil quenching from 860 to 880°C or water quenching from 830 to 850°C, followed by tempering at a temperature greater than 520°C for one hour. Guideline Heat Treatments are as follows: Annealing: Heat to 680 - 720°C, hold at temperature for a minimum of 2 hours 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 sufficient time to complete transformation, then cool in still air. Final Heat Treatment: Harden by oil quenching from 860 - 880°C, or water quenching from 830 - 850°C, followed by tempering at a temperature in the range 550 - 620°C, using the graphs of tempering temperatures versus mechanical properties contained within the specification for assistance.

UNI 25 CrMo 4 F Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Tensile Strength

686 — 981 MPa

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Brinell Hardness (HB)

202 — 289

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Elongation, A

≥ 13 %

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Impact Energy

val1 J

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Yield Strength, Rp0.2

val1 MPa

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UNI 25 CrMo 4 F International Equivalent Materials

Showing 10 of 59 results.

MATERIAL

STANDARD

COUNTRY / PRODUCER

EQUIVALENCE CATEGORY

MATERIAL

S 142

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

T 53

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

T 60

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

S 158

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

S 534

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

T 76

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

T 77

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

FE-PL43S

STANDARD

ASD-STAN

COUNTRY / PRODUCER

European Union

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

S 535

STANDARD

B.S.

COUNTRY / PRODUCER

United Kingdom

EQUIVALENCE CATEGORY

Composition 100%

MATERIAL

1.7214

STANDARD

COUNTRY / PRODUCER

Germany

EQUIVALENCE CATEGORY

Composition 100%

Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.

Need the full list of 59 international equivalents?

See all 59 equivalent grades with detailed mapping by standard, producer and equivalence category.

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59Cross References

8Composition
20Mechanical Properties
16Physical Properties
1Heat Treatment
-Metallography
-Machinability

4Stress-Strain
-Formability
-Fatigue
-Fracture
-Creep

-Joints
-Coatings
-Dimensions
-Tribology

-Corrosion
-Ageing
-Weatherability
-Irradiation

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