303 stainless steel plate

303 stainless steel plate

Alloy 303 is a non-magnetic, austenitic stainless steel that is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium / 8% nickel stainless steel. Alloy 303 was specially designed to exhibit improved machinability while maintaining good mechanical and corrosion resistant properties Due to the presence of sulfur in the steel composition, Alloy 303 is the most readily machineable austenitic stainless steel; however, the sulfur addition does lower Alloy 303’s corrosion resistance to below that of Alloy 304. Like other austenitic grades, Alloy 303 demonstrates excellent toughness, although the sulfur does reduce this a little as well.

Alloy 303 is resistant to mildly corrosive environments. However, the alloy’s corrosion resistance is inferior to 304 in most applications. Its corrosion resistance is superior to 416, another free-machining grade, but is somewhat inferior to other 400 series stainless steels which do not contain higher sulfur levels. In order to obtain optimal corrosion resistance, it is recommended that Alloy 303 be chemically treated to remove sulfides from the final surfaces.

Chemical Composition (%) of 303 Stainless Steel Plate
Chromium Nickel Carbon Manganese Phosphorus
17.0 min.-19.0 max 8.0 min.-10.0 max. 0.10 2.00 0.20
Sulfer Silicon Copper Nickel Iron
0.15-0.35 1.00 1.00 0.110 Balance
Mechanical Properties of 303 Stainless Steel Plate
Yield Strengtd 0.2% Offset Ultimate Tensile Strengtd Elongation in 2 in. Hardness
psi (min.) (MPa) psi (min.) (MPa) % (min.) (max.)
45,000 310 85,000 586 50 202 (HBN)
Physical Properties of 303 Stainless Plate
Density lb/inᶟ 0.290
Density g/cmᶟ 7.89
Melting Point 2552°F
Thermal Conductivity at 212°F (100°C) 112 BTU/hr/ft²/ft/°F
Thermal Conductivity at 212°F (100°C) 16.2 W/m-°K
Electrical Resistivity 28.3 Microhm-in at 68°C
Electrical Resistivity 72.0 Microhm-cm at 20°C
Machining Operation Speed for 303 Stainless Plate
Machinability High Speed Tooling Carbide Tooling Deptd, Widtd or
Diameter of Tool
Speed
(sfm)
Feed
(in./rev.)
Speed
(sfm)
Feed
(in./rev.)
(in.)
(dia./in.)
Turning 115
135
0.0150
0.0050
375
600
0.025
0.007
0.005-0.200
0.002-0.004
Cut-off 90
100
0.0015
0.0025
275
325
0.002
0.004
1/16
1/4
Forming 100
100
0.0020
0.0015
375
350
0.003
0.002
1
2
Drilling 70
85
100
0.0060
0.0100
0.0200

700
800

0.005
0.007
1/4
1/2
1-2
Reaming 90
90
0.0050
0.0150


1/4
1-2
End Milling 130
130
0.0030
0.0060
300
350
0.004
0.009
1/2
1-2
Tapping and tdreading 10
40



7 tdreads/in.
25 tdeads/in.

If you are interested in other Stainless Steel Plates/Sheets, please click 302, 303, 304, 304L, 304H, 309, 309S, 310, 310S, 310H, 316, 316L, 317/317L, 317LMN, 321, 321H, 330, 347, 347H, 904L, 403, 405, 409, 410, 410S, 410/HT, 416, 416HT, 420, 422, 430, 440C, Duplex 2205, Duplex 2304, Duplex 2507.

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