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X33CrNiMnN23-8 Application:Valve Internal Combustion Engines steel (NF-EN 1009-1998)
Category Type Steel grade Standard Country
Grades Special Alloy X33CrNiMnN23-8 AFNOR France

Chemical composition % of the ladle analysis of grade X33CrNiMnN23-8

C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Ni(%) Mo(%) W(%) N(%)
0.28-0.38 0.50-1.50 1.50-3.50 Max 0.045 Max 0.030 22.0-24.0 7.00-9.00 Max 0.50 Max 0.50 0.25-0.35
X33CrNiMnN23-8
Mechanical properties of grade X33CrNiMnN23-8
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)
895 (≥) 378 (≥) 42 24 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 122
Physical properties of grade X33CrNiMnN23-8
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
911 (≥) 755 (≥) 14 42 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 144
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
765 657 855
X33CrNiMnN23-8 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
X33CrNiMnN23-8 AFNOR France
Valve steels and alloys for internal combustion engines
1.4866 AFNOR France
Valve steels and alloys for internal combustion engines

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