GBT K640

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GBT K640

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K640 Application:Age hardening type Nickel base alloy

Chemical composition(mass fraction)(wt.%) of the K640
C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) W(%) Co(%)
0.45-0.55 Max 1 Max 1 Max 0.04 Max 0.04 24.5-26.5 9.50-11.5 7.00-8.00 Balance

Mechanical properties of grade K640

Yield
Rp0.2 (MPa)
Tensile
Rm (MPa)
Impact
KV (J)
Elongation
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition HBW
924 (≥) 865 (≥) 12 22 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 141

Physical properties of grade K640

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
669 (≥) 153 (≥) 34 31 11 Solution and Aging, Annealing, Ausaging, Q+T,etc
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
- - -
297 117 637 - - -

K640 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