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ASTM 303 MA Details

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303 MA Application:Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated

Category Type Grade Microstructure Designations
Grades Stainless Steels 303 MA Austenite USA - ASTM , SAE AMS 5638G (2010) - Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated

Chemical composition(wt.%) of 303 MA grade: SAE AMS 5638G (2010)

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.15
Si - 1.00
Mn - 2.00
P - 0.05
S 0.11 0.16
Cr 17.0 19.0
Ni 8.00 10.0
Mo 0.40 0.60
Al 0.60 1.00
Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated

Mechanical properties of grade 303 MA SAE AMS 5638G (2010)

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)
196 (≥) 311 (≥) 42 42 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 232

Physical properties of grade 303 MA SAE AMS 5638G (2010)

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
797 (≥) 361 (≥) 22 33 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 333
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
174 941 846

303 MA - 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
303 MA UNS USA
Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated
303 MA ASTM USA
Steel, Corrosion-Resistant, Bars and Forgings 0.14S - 18Cr - 9.5Ni - 0.50Mo - 0.80Al (303MA) Free-Machining; Swaging or Upsetting Solution Heat Treated
A 959 Type XM-2 SAE USA
Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
A 581 S30345 SAE USA
Free-Machining Stainless Steel Wire and Wire Rods
A 582 S30345 SAE USA
Standard Specification for Free-Machining Stainless Steel Bars
S30345 AISI USA
Austenitic Chromium Nickel Aluminum Free-Machining Stainless Steel

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