DIN 31 CrMo 12 Structural and constructional steels

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

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DIN 31 CrMo 12 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.28 – 0.35
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
2.80 – 3.30
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

EN 10085: 2001 / Nitriding steels - Technical delivery conditions

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DIN 31 CrMo 12 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Density
7.67 — 7.86 kg/dm³
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Poisson Coefficient
0.27 — 0.3
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This material has 411 properties — only a subset is shown here.

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DIN 31 CrMo 12 Heat Treatments

  • Softening at 650 to 700°C;
    Hardening in oil at 870 to 910°C and Tempering at 570 to 700°C;
    Nitriding at 500 to 520°C;
    Nitrocarburizing in gas salt bath at 570 to 580°C or in powder plasma max. 580°C.
  • Soft annealing: 650-700°C; Hardening: 870-930°C (0,5 h minimum), oil or water cooling; Tempering: 580-700°C (1 h minimum); Nitriding: 480-570°C.

DIN 31 CrMo 12 Mechanical Properties

Temperature

PROPERTY / VALUE
Yield Strength, Rp0.2
val1
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MPa
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Tensile Strength
880 — 1230 MPa
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Elongation, A
10 %
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Impact Energy
val1
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J
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Brinell Hardness (HB)
≤ 248
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Vickers Hardness (HV)
val1
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Grain Size
val1
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  • 23 Composition
  • 50 Mechanical Properties
  • 4 Physical Properties
  • 9 Heat Treatment
  • 4 Metallography
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  • 3 Fatigue
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