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Introduction:
This is an austenitic steel whose machinability has
been enhanced by an increased sulphur content (0.15
- 0.35%). In certain operations, feeds and speeds
can be increased up to 50%. Addition of selenium can
also give the same effect, eg. UNS S30323 has 0.15%
min Se and 0.06% max S.
Even moderate amounts of
sulphur can reduce the pitting and crevice corrosion
resistance. Therefore, the use of a free machining
grade might need reconsideration if the basic alloy
content is only marginally adequate for the corrosive
environment.
This alloy is not readily-weldable because the high
sulphur content causes cracking. 29Cr 9Ni (312) weld
metals containing about 35% ferrite are used to reduce
hot cracking tendencies.
Metallurgy:
Normal austenitic stainless steels are tough, single
phase alloys that tend to work harden. Consequently,
successful machining requires careful attention to
tooling, speeds, feeds, etc. Raising the sulphur content
from the normal 0.030% max to 0.15-0.35% enables some
feeds or speeds to be increased by up to 50%.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
17.00 |
19.00 |
| Nickel |
8.00 |
10.00 |
| Molybdenum |
- |
0.70 |
| Manganese |
- |
2.00 |
| Carbon |
- |
0.12 |
| Sulphur |
0.15 |
0.35 |
| Phosphorus |
- |
0.06 |
|
Similiar Specifications:
ISO 683/13 17
17-19%Cr, 8-10%Ni, <0.7%Mo,
<2%Mn, <0.12%C, 0.15-0.35%S, <0.06%P
EURONORM X10 CrNiS 18 9
17-19%Cr, 8-10%Ni, <0.7%Mo,
<2%Mn, <0.12%C, 0.15-0.35%S, <0.06%P
ASTM UNS S30300
303
17-19%Cr, 8-10%Ni, <0.6%Mo,
<2%Mn, <0.15%C, >0.15%S, <0.20%P
BS 303S31
17-19%Cr, 8-10%Ni, <1.0%Mo,
<2%Mn, <0.12%C, 0.15-0.35%S, <0.06%P
DIN X10 CrNiS 18 9 1.4305
17-19%Cr, 8-10%Ni,
<2%Mn, <0.12%C, 0.15-0.35%S, <0.06%P
JIS SUS 303
17-19%Cr, 8-10%Ni, <0.6%Mo,
<2%Mn, <0.15%C, >0.15%S, <0.20%P
Applications:
Screws, bolts, nuts, studding, Machined parts
Product Forms:
Plate, Sheet and Strip
DIN X10 CrNiS
18 9 1.4305 17440
Bar and Long Products
EURONORM X10 CrNiS 18 9 88-86/1
ASTM UNS S30300
303 582
BS 303S31 970/1
DIN X10 CrNiS
18 9 1.4305 17440
JIS SUS 303 4303
Forgings and Others
EURONORM X10 CrNiS 18 9 88-86/1
ASTM UNS S30300
303 314
BS 303S31 970/1
DIN X10 CrNiS
18 9 1.4305 17440
General
ISO 683/13 17
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