UNI 40 NiCrMo 3 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels

Country/Standard: Italy / UNI

Data updates

Latest Update: 2021-04

Total number of updates: 1

Update History

This material has 223 properties — only a subset is shown here.

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UNI 40 NiCrMo 3 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.37 – 0.43

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

0.60 – 1.00

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 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 40 NiCrMo 3 Physical Properties

Temperature

0 - 30°C

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 223 properties — only a subset is shown here.

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UNI 40 NiCrMo 3 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. Annealed: Annealed to obtain a structure with a controlled hardness. 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 640 - 680°C. Normalise at 850 - 880°C. Harden from 830 - 860°C and temper at 540 - 680°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 640 - 680°C. Spheroidise Annealed (Spheroidised). Annealed to obtain a ferritic/pearlite structure (Annealed). 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 850 - 880°C.

UNI 40 NiCrMo 3 Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Yield Strength, Rp0.2

val1 MPa

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Tensile Strength

1030 — 1230 MPa

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Elongation, A

10 %

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Impact Energy

val1 J

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Brinell Hardness (HB)

190 — 245

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Rockwell Hardness (HR)

val1

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93 Cross References

16 Composition
15 Mechanical Properties
3 Physical Properties
5 Heat Treatment
- Metallography
- Machinability

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

- Joints
- Coatings
- Dimensions
- Tribology

- Corrosion
- Ageing
- Weatherability
- Irradiation

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