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AMS C250, 250, UNS K92890, 1.6359, Alloy 250 Details

C250 is used for missile and ejector systems, slat tracks and drive shafts.

AMS C250, 250, UNS K92890, 1.6359, Alloy 250 Standard Download

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C250, 250, UNS K92890, 1.6359, Alloy 250 Application:C250 is used for missile and ejector systems, slat tracks and drive shafts.
Category Type Grade Microstructure Designations
Grades Maraging steel C250, 250, UNS K92890, 1.6359, Alloy 250 Martensite USA - AMS , AMS 6512 -
BS S162 -
Chemical composition(mass fraction)(wt.%)
Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.03
Si - 0.10
Mn - 0.10
P - 0.010
S - 0.010
Cr - 0.50
Ni 17.00 19.00
Co 7.00 8.50
Al 0.05 0.15
Mo 4.60 5.20
Ti 0.30 0.50
Cu - 0.50
Fe - Bal
Mechanical properties of grade C250, 250, UNS K92890, 1.6359, Alloy 250
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)
856 (≥) 288 (≥) 31 23 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 334
Physical properties of grade C250, 250, UNS K92890, 1.6359, Alloy 250
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
413 (≥) 611 (≥) 42 22 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 444
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
823 898 577
C250, 250, UNS K92890, 1.6359, Alloy 250 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
Maraging Steel 250 / C250 AMS USA
Structural and constructional steels
K92890 UNS USA
Structural and constructional steels
1.6359 DIN Germany
Structural and constructional steels
C250, 250, UNS K92890, 1.6359, Alloy 250 AMS USA
C250 is used for missile and ejector systems, slat tracks and drive shafts.