35 NiCrMo 15 (Italy / UNI) Material Properties

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

Data updates

Latest Update: 2019-07
Total number of updates: 2
Update History:
2016-02

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 1079 — 1961 MPa view details
Elongation, A 6 % view details
Impact Strength val1
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kJ/m² view details
Brinell Hardness (HB) 275 view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 156.5 — 284.4 ksi view details
Elongation, A 6 % view details
Impact Strength val1
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ft·lb/in² view details
Brinell Hardness (HB) 275 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
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
Thermal Conductivity 37.656 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
Electrical Resistivity 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
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
Thermal Conductivity 21.8 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
Electrical Resistivity 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
0.30 – 0.38
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
1.60 – 1.90
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.30 – 0.60
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 6925: 1971 / Aircraft metallic materials. Hardening and tempering alloyed steel (C 0,35%, Ni 3,75%, Cr 1,75% and Mo 0,35%)

Heat Treatments

  • Bars and wires hardened and tempered were heat treated as follows: Harden by air cooling from 850 to 870°C followed by tempering at 520 to 540°C for one hour.<br />Annealing: Heat to 640 - 660°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.<br />To avoid an unacceptable reduction of toughness, tempering should not be carried out in the range of 260 to 420°C.<br />Stress relieve by heating to 180 - 210°C, holding at temperature for a minimum of 2 hours, then cool in still air.