31 CrMoV 9 (Germany / DIN) Material Properties

Other designations:
Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: Germany / DIN

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 850 — 1300 MPa view details
Elongation, A 9 % 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 123.3 — 188.5 ksi view details
Elongation, A 9 % 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
0.27 – 0.34
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
2.30 – 2.70
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
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2

EN 10085: 2001 / Nitriding steels - Technical delivery conditions

Heat Treatments

  • <b>Softening </b> at 680 to 720°C; <br> <b>Hardening </b> in oil or water at 840 to 880°C and <b>Tempering </b> at 570 to 680°C; <br> <b>Nitriding </b> at 500 to 520°C; <br> <b>Nitrocarburizing </b> in gas salt bath at 570 to 580°C or in powder plasma max. 580°C.
  • Soft annealing: 680-720°C; Hardening: 870-930°C (0,5 h minimum), oil or water cooling; Tempering: 580-700°C (1 h minimum); Nitriding: 480-570°C.