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UNS NV8 Details

Steel for intake valves

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NV8 Datasheet
UNS NV8

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NV8 Application:Steel for intake valves
Category Type Grade Designations
Grades Stainless Steels NV8 USA - UNS ,
Chemical composition(mass fraction)(wt.%)
Elements Min.（≥） Max.（≤） Similar Remarks
C 0.35 0.45
Si 3.60 4.20
Mn 0.20 0.40
P - 0.030
S - 0.04
Cr 1.85 2.50
Ni - 0.10
Mo - O.25
Cu - 0.25
Mechanical properties of grade NV8
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)
765 (≥) 581 (≥) 12 12 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 222
Physical properties of grade NV8
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
257 (≥) 413 (≥) 34 43 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 311
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
369 477 745
NV8 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
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
NV8 UNS USA
Steel for intake valves
HNV8 UNS USA
Steel for intake valves