31 CrMo 12 (France / AFNOR NF) Material Properties

Other designations:
Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: France / AFNOR NF

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 — 1230 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 — 178.4 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
0.28 – 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

Heat Treatments

  • 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.
  • The base composition and the heat treatment (quenching and tempering) prior to nitriding both have an influence on the results of nitriding treatment. The tempering temperature should not be less than 50°C higher than the nitriding temperature. A difference of less than 50°C should be the subject of a special agreement. <br /> Soft annealing at 650-700°C; <br /> Hardening at 870-930°C (time for austenitizing as a guide: 0.5h minimum) and quenching in oil or water; <br /> Tempering at 580-700°C (time for tempering as a guide: 1h minimum; With very large sizes, the tempering temperature may be agreed at the time of enquiry and order).;<br /> Nitriding at 490-570°C (time for nitriding depends on the desired depth of the nitrided case).