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ISO X55CrMnNiN20-8 Details

X55CrMnNiN20-8 Application:Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines

Category Type Grade Microstructure Designations
Grades Stainless Steels X55CrMnNiN20-8 Austenite International - ISO , ISO 683-15 (1992) - Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines

Chemical composition(wt.%) of X55CrMnNiN20-8 grade: ISO 683-15 (1992)

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.50 0.60
Si - 0.25
Mn 7.00 10.00
P - 0.050
S - 0.030
Cr 19.50 21.50
Mo - -
Ni 1.50 2.75
N 0.20 0.40
Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines

Mechanical properties of grade X55CrMnNiN20-8 ISO 683-15 (1992)

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)
487 (≥) 892 (≥) 12 42 42 Solution and Aging, Annealing, Ausaging, Q+T,etc 143

Physical properties of grade X55CrMnNiN20-8 ISO 683-15 (1992)

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
159 (≥) 618 (≥) 11 12 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 131
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
858 275 368

X55CrMnNiN20-8 - Form of Supply

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
X55CrMnNiN20-8 AFNOR France
Valve steels and alloys for internal combustion engines
1.4875 AFNOR France
Valve steels and alloys for internal combustion engines
X55CrMnNiN20-8 ISO International
Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines

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