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STR 661

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Korea KS STR661 Heat - resisting steel bars and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: STR661 / STR 661
Category Grade Standard Region/Area Standard Content
Metals STR 661 KS D 3731 Korea Heat - resisting steel bars

Chemical composition(mass fraction)(wt.%) of the STR 661

Element Min Max Similar
Co 18.5000 21.0000 -
W 2.0000 3.0000 -
N 0.1000 0.2000 -
Nb 0.7500 1.2500 -
Mo 2.5000 3.5000 -
Ni 19.0000 21.0000 -
Cr 20.0000 22.5000 -
P - 0.0400 -
S - 0.0300 -
Mn 1.0000 2.0000 -
Si - 1.0000 -
C 0.0800 0.1600 -
Co 18.5000 21.0000 -
W 2.0000 3.0000 -
N 0.1000 0.2000 -
Nb 0.7500 1.2500 -
Mo 2.5000 3.5000 -
Ni 19.0000 21.0000 -
Cr 20.0000 22.5000 -
P - 0.0400 -
S - 0.0300 -
Mn 1.0000 2.0000 -
Si - 1.0000 -
C 0.0800 0.1600 -
W 2.0000 3.0000 -
Si - 1.0000 -
S - 0.0300 -
P - 0.0400 -
Ni 19.0000 21.0000 -
Nb 0.7500 1.2500 -
N 0.1000 0.2000 -
Mo 2.5000 3.5000 -
Mn 1.0000 2.0000 -
Cr 20.0000 22.5000 -
Co 18.5000 21.0000 -
C 0.0800 0.1600 -
W 2.0000 3.0000 -
Si - 1.0000 -
S - 0.0300 -
P - 0.0400 -
Ni 19.0000 21.0000 -
Nb 0.7500 1.2500 -
N 0.1000 0.2000 -
Mo 2.5000 3.5000 -
Mn 1.0000 2.0000 -
Cr 20.0000 22.5000 -
Co 18.5000 21.0000 -
C 0.0800 0.1600 -

Mechanical Properties of steel grade STR 661

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
998 (≥) 664 (≥) 43 34 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 421

Physical Properties of steel grade STR 661

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
24 - -     0.34 -  
448 521 - 43.3 322   -  
122 - 11 24.2   443 242

Heat Treatment of steel grade STR 661

Heat treated : 1135°C - 1297°C

Technological Curves of steel grade STR 661

Cross Reference Table (Equivalent Grade) of STR 661

Grade Standard Country Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1
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