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Austenitic 661 Application:CNS standard heat resistant steel bars(CNS 9608-1998)
Category Type Steel grade Standard Country
Grades Special Alloy Austenitic 661 CNS China

Chemical composition % of the ladle analysis of grade Austenitic 661

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Mo(%) W(%) Co(%) Nb(%)
Max 0.15 Max 1.00 Max 2.00 Max 0.20 Max 0.15 17.0-19.0 8.00-10.0 Max 0.60 2.00-3.00 18.5-21.0 0.75-1.25
CNS standard heat resistant steel bars(CNS 9608-1998)
Mechanical properties of grade Austenitic 661
Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
738 (≥) 645 (≥) 31 12 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 343
Physical properties of grade Austenitic 661
Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
242 (≥) 659 (≥) 41 41 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 221
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
363 726 459
Austenitic 661 Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

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