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SAE A 803 Grade 25-4-4 Details

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A 803 Grade 25-4-4 Application:Welded Ferritic Stainless Steel Feedwater Heater Tubes

Category Type Grade Microstructure Designations
Grades Stainless Steels A 803 Grade 25-4-4 Precipitation-Hardening USA - SAE , A 803/A 803M (2012) - Welded Ferritic Stainless Steel Feedwater Heater Tubes

Chemical composition(wt.%) of A 803 Grade 25-4-4 grade: A 803/A 803M (2012)

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
Welded Ferritic Stainless Steel Feedwater Heater Tubes

Mechanical properties of grade A 803 Grade 25-4-4 A 803/A 803M (2012)

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)
181 (≥) 477 (≥) 43 12 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 114

Physical properties of grade A 803 Grade 25-4-4 A 803/A 803M (2012)

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
277 (≥) 582 (≥) 32 43 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 322
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
812 282 515

A 803 Grade 25-4-4 - 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
A 176 S44635 SAE USA
Stainless and Heat-Resisting Chromium Steel Plate, Sheet, and Strip
A 240 S44635 SAE USA
Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 268 S44635 SAE USA
Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
S44635 AISI USA
Ferritic Chromium Molybdenum Nickel Stainless Steel (25-4-4)
SA-240 S44635 AMS USA
Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
SA-268 S44635 AMS USA
Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
A 268 25-4-4 SAE USA
Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
A 791 Grade 25-4-4 SAE USA
Aluminum-Zinc Alloy-Coated Wire Strand
A 803 Grade 25-4-4 SAE USA
Welded Ferritic Stainless Steel Feedwater Heater Tubes
A 959 Type 25-4-4 SAE USA
Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
K42544 AISI USA
Alloy Steel
SA-240 Type 25-4-4 AMS USA
Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
SA-268 25-4-4 AMS USA
Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
SA-803 25-4-4 AMS USA
Specification for Welded Ferritic Stainless Steel Feedwater Heater Tubes

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