Stainless Steel

303 BS EN 10088-3

Description

Grade 303 stainless steel is a non magnetic, austenitic, free machining stainless steel that is a modification of the basic 18Cr - 8Ni stainless steel.The addition of sulphur (S) and in some cases selenium (Se) produces the excellent machining characteristics while maintaining good mechanical and corrosion-resistant properties and a high resistance to oxidation.The high sulphur content that dramatically increases cutting speeds also reduces the grades formability making type 303 not readily cold workable. Sharp bending should be avoided.

Stainless Steel type 303 is austenitic at all temperatures and cannot be hardened by heat treatment. Free machining grades are not generally recommended for welding.

Typical applications include nuts & bolts, switchgear components, bushings, shafts and gears.

Colour Code

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Related Specifications

Steel Number Steel Name Grade UNS BS 970 1983
1,4305 X8CrNiSI8-9 303 S30300 303S31

Typical Chemical Analysis

C Mn Si P S Cr Ni Fe
1.5 max 2.0 max 1.0 max .2 max .15-35 17-19 8-10 Bal
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Rounds Rounds
(mm) (mm)
2.00 50.00
4.00 55.00
5.00 60.00
6.00 65.00
7.00 70.00
8.00 75.00
9.00 80.00
10.00 85.00
11.00 90.00
12.00 95.00
13.00 100.00
14.00 105.00
15.00 110.00
16.00 115.00
20.00 120.00
22.00 125.00
25.00 130.00
28.00 135.00
30.00 140.00
35.00 145.00
40.00 150.00
45.00 155.00
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Rounds Rounds
(inch) (inch)
116 114
332 138
18 112
964 158
532 134
316 2
14 214
932 212
516 3
1132 312
38 4
1332 6
716
3164
12
916
58
1116
34
78
1
118
Hexagons Hexagons
(mm) (inch)
8.00 316
10.00 14
13.00 516
14.00 38
19.00 716
32.00 12
41.00 58
50.00 78
1
1316
114
1516
138
1716
112
158
178
2

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Disclaimer

All data provided is for information and guidance only. Information above is not for design purposes and comes without warranty or guarantee with respect to the subject matter or fitness for purpose.