40 NiCrMo 7 (Italy / UNI) Material Properties

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

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 765 — 1373 MPa view details
Elongation, A 7 % view details
Impact Strength val1
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kJ/m² view details
Impact Energy val1
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J view details
Brinell Hardness (HB) 230 view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 111 — 199.1 ksi view details
Elongation, A 7 % view details
Impact Strength val1
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ft·lb/in² view details
Impact Energy val1
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ft·lb view details
Brinell Hardness (HB) 230 view details

Physical Properties

Temperature

0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Shear Modulus val1
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GPa view details
Density val1
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kg/dm³ view details
Poisson Coefficient val1
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view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Thermal Conductivity 42 W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Thermal Conductivity val1
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W/(m∙°C) view details
Heat Capacity val1
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J/(kg∙°C) view details
Heat Capacity val1
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J/(kg∙°C) view details
Heat Capacity val1
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J/(kg∙°C) view details
Electrical Resistivity 0.19 — 0.3 Ω∙mm²/m view details
Electrical Resistivity val1
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Ω∙mm²/m view details
Electrical Resistivity val1
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Ω∙mm²/m view details
Modulus of Elasticity 27.6 E+03 — 30.5 E+03 ksi view details
Shear Modulus val1
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ksi view details
Density val1
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lb/in³ view details
Poisson Coefficient val1
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view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details
Thermal Conductivity 24.3 BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Thermal Conductivity val1
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BTU/(h∙ft∙°F) view details
Heat Capacity val1
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BTU/(lb∙°F) view details
Heat Capacity val1
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BTU/(lb∙°F) view details
Heat Capacity val1
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BTU/(lb∙°F) view details
Electrical Resistivity 316 E-06 — 499 E-06 Ω∙circular·mil/ft view details
Electrical Resistivity val1
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Ω∙circular·mil/ft view details
Electrical Resistivity val1
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Ω∙circular·mil/ft view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.38 – 0.43
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.70 – 0.90
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 6926: 1971 / Aircraft metallic materials. Hardening and tempering alloyed steel (C 0,40%, Ni 1,80%, Cr 0,80% and Mo 0,25%)

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.<br />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.<br />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.