AMS SA-268 25-4-4

Grades | Stainless Steels | SA-268 25-4-4

AMS SA-268 25-4-4 ( Precipitation-Hardening )

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SA-268 25-4-4 Application:Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service

Chemical composition(mass fraction)(wt.%) of the SA-268 25-4-4
Elements Min.（≥） Max.（≤） Similar Remarks
C - 0.025
Si - 0.75
Mn - 1.00
P - 0.04
S - 0.04
Ni 3.35 4.50
Cr 24.50 26.00
Al - -
Cu - 0.50
Ti - -
Fe - -
N - 0.035
Mo 3.50 4.50

Mechanical properties of grade SA-268 25-4-4

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition HBW
789 (≥) 847 (≥) 42 14 33 Solution and Aging, Annealing, Ausaging, Q+T,etc 414

Physical properties of grade SA-268 25-4-4

Property Density
kg/dm3		 Temperature T
°C/F		 Specific heat
J / kgK		 Thermal conductivity
W/mK		 Electric resistance
µΩ·cm
473 (≥) 947 (≥) 44 13 13 Solution and Aging, Annealing, Ausaging, Q+T,etc
Temp.
°C/°F		 Creep strain limit
(10000h)
(Rp1,0) N/mm2		 Creep rupture strength
(10000h)
(Rp1,0) N/mm2		 - - -
354 923 641 - - -

SA-268 25-4-4 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