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Stainless Steel / 303 SEL ANN

303SE is an austenitic stainless steel melted as AOD melt type and offers excellent machinability. This grade is a modified version of 303 with a selenium addition in place of sulfur which allows for excellent machinability. Selenium produces a better surface finish. This 18-8 chromium-nickel stainless steel is modified by the addition of selenium or sulphur, as well as phosphorus, to improve machinability and non- seizing properties. 303 is non-magnetic in the annealed condition and not hardenable by heat treatment. Stainless Steel 303 is widely used in the screw machine industry, as well as for use in shafts, valves and fittings. Stainless Steel 303 is not recommended for vessels containing gases or liquids under high pressure. (UNS:S30323)

Chemical Makeup

Element	Min	Max
Carbon, C	–	0.15
Manganese, Mn	–	2
Silicon, Si	–	1
Sulfur, S	–	0.04
Phosphorus, P	0.12	0.17
Chromium, Cr	17	19
Nickel, Ni	8	10
Copper, Cu	-	1
Molybdenum, Mo	-	1
Selenium, Se	0.15	0.4

Common Applications

Aerospace
Industrial

Benefits

Excellent Machinability
Corrosion Resistance
Nongalling Properties

We stock 303 SEL ANN to the following specifications:

AMS-5640 TYPE 2
AMS-5641
ASTM-A-320 GRD B8F CL. 1
ASTM-A-484
ASTM-A-582
MIL-S-7720
MIL-W-52263
QQS-763C
QQS-764 B

Click on a cross-section to see the sizes we stock:

hex
Round
Square

Stainless Steel
303 SEL ANN
Round
80 sizes and conditions:

CD - Cold Drawn CG - Centerless Ground CG - Centerless Ground HR RT - Hot Rolled Rough Turned HR RT - Hot Rolled Rough Turned PG - PG -
3/32 - CD
1/8 - CD
.130 - CD
5/32 - CD
3/16 - CD
.1925 - CD
7/32 - CD
1/4 - CD
.255 - CD
9/32 - CD
5/16 - CD
.3175 - CD
11/32 - CD
3/8 - CD
.380 - CD
13/32 - CD
7/16 - CD
.4425 - CD
15/32 - CD
1/2 - CD
.505 - CG
17/32 - CG
9/16 - CG
.5675 - CG
19/32 - CG
5/8 - CG
.630 - CG
21/32 - CG
11/16 - CG
3/4 - CG
.755 - CG
13/16 - CG
7/8 - CG
15/16 - CG
1 - CG
1.005 - CG
1-1/16 - CG
1-1/8 - CG
1-3/16 - CG
1-1/4 - CG
1-5/16 - CG
1-3/8 - CG
1-7/16 - CG
1-1/2 - CG
1-9/16 - CG
1-5/8 - CG
1-11/16 - CG
1-3/4 - CG
1-13/16 - CG
1-7/8 - CG
2 - CG
2-1/8 - CG
2-1/4 - CG
2-3/8 - CG
2-1/2 - CG
2-5/8 - CG
2-3/4 - CG
2-7/8 - CG
3 - CG
3-1/4 - HR RT
3-1/2 - HR RT
3-3/4 - HR RT
4 - HR RT
4-1/4 - HR RT
4-1/2 - HR RT
4-3/4 - HR RT
5 - HR RT
6 - HR RT
1/8 - PG
3/16 - PG
1/4 - PG
5/16 - PG
3/8 - PG
7/16 - PG
1/2 - PG
9/16 - PG
5/8 - PG
3/4 - PG
1 - PG

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Stainless Steel / 303 SEL ANN

Chemical Makeup

Common Applications

Benefits

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