UNI 40 NiCrMo 7 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: 4

Update History

2019-07 2017-08 2016-02

This material has 336 properties — only a subset is shown here.

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UNI 40 NiCrMo 7 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.38 – 0.43

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

0.70 – 0.90

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 6926: 1971 / Aircraft metallic materials. Hardening and tempering alloyed steel (C 0,40%, Ni 1,80%, Cr 0,80% and Mo 0,25%)

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UNI 40 NiCrMo 7 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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Shear Modulus

val1 GPa

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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Thermal Conductivity

42 W/(m∙°C)

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Heat Capacity

val1 J/(kg∙°C)

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Electrical Resistivity

0.19 — 0.3 Ω∙mm²/m

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Electrical Conductivity

val1 S/m

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This material has 336 properties — only a subset is shown here.

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UNI 40 NiCrMo 7 Heat Treatments

Bars and wires were hardened and tempered as follows: Harden by oil quenching from 830 to 850°C, followed by tempering at 530 to 550°C for one hour.
Annealing: Heat to 640 - 680°C, hold 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 850 - 870°C, hold at temperature for a minimum of 2 hours then cool in still air.
To avoid an unacceptable reduction of toughness, tempering should not be carried out in the range of 280 to 440°C.
Forging: 850-1050°C; Queching: 830-850°C (duration of permanence at hardening must be sufficient so that the transformation of steel structure is complete in whole mass of arc rod the duration should not be less than 1/2 hr.), oil (temperature must be between 15-60°C); Tempering: 550-650°C, at least 1 hour. Jominy test piece hard: 850 +/-5°C (piece must always be normalized before the test). Soft annealing: 640-680°C; Normalizing 850-880°C.

UNI 40 NiCrMo 7 Mechanical Properties

Temperature

0 - 30°C

PROPERTY / VALUE

Yield Strength, Rp0.2

val1 MPa

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Tensile Strength

765 — 1373 MPa

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Elongation, A

7 %

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Impact Strength

val1 kJ/m²

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Impact Energy

val1 J

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Brinell Hardness (HB)

230

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103 Cross References

33 Composition
76 Mechanical Properties
25 Physical Properties
7 Heat Treatment
- Metallography
- Machinability

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

- Joints
- Coatings
- Dimensions
- Tribology

- Corrosion
- Ageing
- Weatherability
- Irradiation

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