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ATI Allegheny Ludlum Stainless Steel Free Machining Grade Type 303, Annealed (UNS S30300)

Category Metal , Ferrous Metal , Stainless Steel , T 300 Series Stainless Steel
Manufacturer ATI Allegheny Ludlum
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF ATI Allegheny Ludlum Stainless Steel Free Machining Grade Type 303, Annealed (UNS S30300).pdf
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Material Notes:
Allegheny Ludlum's 303 is a free-machining stainless steel specifically designed to exhibit improved machinability. These modifications retain, in so far as possible, the good mechanical properties and corrosion resistance of the basic or patent compositions which they represent. Sulfur is added to produce the free-machine characteristics. Type 303 is a non-magnetic austenitic stainless steel which is not hardenable by heat treatment. It is the free-machining modification of the basic 18% chromium - 8% nickel stainless steel.Information provided by Allegheny Ludlum Corporation.
Physical Properties Metric English Comments
Density 8.03 g/cc
0.290 lb/in³
Mechanical Properties Metric English Comments
Tensile Strength, Ultimate 517 - 621 MPa
75000 - 90100 psi
Tensile Strength, Yield 207 - 276 MPa
30000 - 40000 psi
Elongation at Break 35 - 50 %
35 - 50 %
in 2" (50 mm)
Reduction of Area 50 - 60 %
50 - 60 %
Modulus of Elasticity 200 GPa
29000 ksi
in tension
Fatigue Strength 285 MPa
41300 psi
test conditions not reported
Izod Impact 81.0 J
59.7 ft-lb
Thermal Properties Metric English Comments
CTE, linear 16.6 µm/m-°C

@Temperature 20.0 - 100 °C
9.22 µin/in-°F

@Temperature 68.0 - 212 °F
18.2 µm/m-°C

@Temperature 20.0 - 500 °C
10.1 µin/in-°F

@Temperature 68.0 - 932 °F
19.6 µm/m-°C

@Temperature 20.0 - 787 °C
10.9 µin/in-°F

@Temperature 68.0 - 1450 °F
Thermal Conductivity 16.4 W/m-K
114 BTU-in/hr-ft²-°F
Melting Point 1400 °C
2550 °F
Maximum Service Temperature, Air 927 °C
1700 °F
oxidation resistance is good
Component Elements Properties Metric English Comments
Carbon, C <= 0.15 %
<= 0.15 %
Chromium, Cr 17 - 19 %
17 - 19 %
Iron, Fe 70 %
70 %
as balance
Manganese, Mn <= 2.0 %
<= 2.0 %
Molybdenum, Mo <= 0.60 %
<= 0.60 %
Nickel, Ni 8.0 - 10 %
8.0 - 10 %
Phosphorous, P <= 0.20 %
<= 0.20 %
Silicon, Si <= 1.0 %
<= 1.0 %
Sulfur, S >= 0.15 %
>= 0.15 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.0000720 ohm-cm
0.0000720 ohm-cm
Magnetic Permeability <= 1.02
<= 1.02
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