NK KSFA 80 (Japan / NKK) Material Properties

Material group: Ferrous Alloys / Structural and constructional steels
Country/Standard: Japan / NKK

Data updates

Latest Update: 2021-12
Total number of updates: 1
Update History:

Mechanical Properties

Temperature

≤ 0°C
0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 470 MPa view details
Tensile Strength 780 — 930 MPa view details
Elongation, A 10 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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J view details
Yield Strength, Rp0.2 68.2 ksi view details
Tensile Strength 113.1 — 134.9 ksi view details
Elongation, A 10 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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ft·lb 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
≤ 0.45
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.40 – 3.50
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Cu
VALUE
≤ 0.30
UNIT
%
CAS NUMBER
7440-50-8
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
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

Rules for the Survey and Construction of Steel Ships, Part K - Materials, Chapter 6 Section 1; Steel Forgings; Steel Forgings / Nippon Kaiji Kyokai (Class NK) / 2021

Heat Treatments

  • Tempering temperature of steel forgings is not to be less than 550°C.