UNS NV7(4140)

Grades | Stainless Steels | NV7(4140)

UNS NV7(4140)

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NV7(4140) Application:Steel for intake valves

Chemical composition(mass fraction)(wt.%) of the NV7(4140)
Elements Min.（≥） Max.（≤） Similar Remarks
C 0.37 0.44
Si 0.15 0.35
Mn 0.65 1.10
P - 0.035
S - 0.04
Cr 0.75 1.20
Mo 0.15 0.25

Mechanical properties of grade NV7(4140)

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition HBW
671 (≥) 295 (≥) 14 12 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 242

Physical properties of grade NV7(4140)

Property Density
kg/dm3		 Temperature T
°C/F		 Specific heat
J / kgK		 Thermal conductivity
W/mK		 Electric resistance
µΩ·cm
959 (≥) 828 (≥) 32 31 12 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		 - - -
518 844 398 - - -

NV7(4140) 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