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ISO X55CrMnNiN20 8 Application:ISO standard valve austenite steel
Category Type Steel grade Standard Country
Grades Special Alloy ISO X55CrMnNiN20 8 ISO ISO

Chemical composition % of the ladle analysis of grade ISO X55CrMnNiN20 8

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Ni(％) N(%)
0.50-0.60 Max 0.25 7.00-10.0 Max 0.05 Max 0.03 19.5-21.5 1.50-2.75 0.20-0.40
ISO standard valve austenite steel
Mechanical properties of grade ISO X55CrMnNiN20 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)
817 (≥) 539 (≥) 31 34 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 321
Physical properties of grade ISO X55CrMnNiN20 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
196 (≥) 736 (≥) 33 31 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 343
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2
998 272 135
ISO X55CrMnNiN20 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
X55CrMnNiN20-8 ISO ISO
Valve steels and alloys for internal combustion engines
1.4875 ISO ISO
Valve steels and alloys for internal combustion engines
X55CrMnNiN20-8 ISO ISO
Heat-treatable steels, alloy steels and free-cutting steels -- Part 15: Valve steels for internal combustion engines

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