31 CrMo 12 (Italy / UNI) Material Properties

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

Data updates

Latest Update: 2021-10
Total number of updates: 3
Update History:
2019-07 2016-04

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 880 — 1275 MPa view details
Elongation, A 10 % view details
Impact Energy val1
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J view details
Brinell Hardness (HB) ≤ 248 view details
Vickers Hardness (HV) val1
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view details
Grain Size val1
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Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 127.6 — 184.9 ksi view details
Elongation, A 10 % view details
Impact Energy val1
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ft·lb view details
Brinell Hardness (HB) ≤ 248 view details
Vickers Hardness (HV) val1
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view details
Grain Size val1
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view details

Physical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Density 7.67 — 7.86 kg/dm³ view details
Poisson Coefficient 0.27 — 0.3 view details
Modulus of Elasticity 27.6 E+03 — 30.5 E+03 ksi view details
Density 0.277 — 0.284 lb/in³ view details
Poisson Coefficient 0.27 — 0.3 view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.29 – 0.34
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
2.80 – 3.20
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.40 – 0.70
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
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 8077: 1980 / Hot rolled special alloyed steel products, bars and coils, for nitriding. Qualities, requirements and tests

Heat Treatments

  • Forging temperature: 1100-900°C; Normalizing: 890-920°C; Soft annealing: 650-700°C; Nitriding: 490-520°C.
  • Forging temperature: 1100-900°C; Normalizing: 890-920°C; Soft annealing: 680-750°C; Oil hardening: 870-910°C; Tempering: 570-650°C; Nitriding: 490-520°C.