Class 8 (France / AFNOR NF) Material Properties

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

Data updates

Latest Update: 2022-12
Total number of updates: 1
Update History:

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 890 MPa view details
Brinell Hardness (HB) 190 — 349 view details
Rockwell Hardness (HR) 25 — 37 view details
Vickers Hardness (HV) val1
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Yield Strength, Rp0.2 129.1 ksi view details
Brinell Hardness (HB) 190 — 349 view details
Rockwell Hardness (HR) 25 — 37 view details
Vickers Hardness (HV) val1
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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
≤ 0.58
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Mn
VALUE
≤ 0.25
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
P
VALUE
≤ 0.060
UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9

EN ISO 898-6: 1995 / Mechanical properties of fasteners - Part 6: Nuts with specified proof load values - Fine pitch thread

Heat Treatments

  • QT: tempering temperature > 380°C for Style 1 and 2, for nuts with coarse pitch thread<br>QT: tempering temperature > 380°C for Style 1, 8 < D ≤ 16 mm for , and > 410°C for Style 1, 16 < D ≤ 39 mm, nuts with fine pitch thread