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Stainless Steel 303 |
Related Metals: |
|
Speed-E-Mac 303(tm)
Project 7000 Stainless 303(tm)
303YM(tm)
Project 70 303(tm)
AF 303(tm)
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Specifications: |
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AISI 303
AMS 5640 (TYPE 1)
ASTM A194 (303, 8F, 8FA)
ASTM A276
ASTM A314
ASTM A320
ASTM A473
ASTM A581
ASTM A582
ASTM A895
DIN 1.4305
UNS S30300
|
 |
Chemistry Data |
Carbon |
|
0.15 max |
Chromium |
|
17 - 19 |
Iron |
|
Balance |
Manganese |
|
2 max |
Molybdenum |
|
0.6 max |
Nickel |
|
8 - 10 |
Phosphorus |
|
0.2 max |
Silicon |
|
1 max |
Sulphur |
|
0.15 min |
|
General Information |
Principal Design Features |
303 is one of the most popular of all the free machining stainless steels. It offers good strength, corrosion resistance and great machinability. It will resist scaling at temperatures up to 1600 F(871 C). |
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Applications |
Used in an incredibly wide variety of parts both in screw and general machining industries. Applications include hardware, fasteners, valve parts, nozzles and trim. |
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Machinability |
Excellent speeds and feeds are capable with this material. The addition of sulfur causes a very brittle chip. Many companies now offer premium machinability grades, such as CarTech with their Project 70 and 7000 series. |
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Corrosion Resistance |
Resistant to a variety of organic and inorganic chemicals, fresh water and atmospheric corrosion. |
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Welding |
Although not recommended, welding may be performed if low temperatures are employed. Recommended filler metal is AWS E/ER312. At high temperature, the sulfur in 303 tends to precipitate at the weld boundary resulting in weak and brittle joints. |
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Hot Working |
Forging and upsetting may commence once the workpiece has been thoroughly heated to 2100-2300 F (1149-1260 C). It is not recommended to work this material below 1700 F (927 C). Rapid post-work cooling will optimize corrosion performance. |
|
Cold Working |
Minor deformation is possible with this alloy, although it is not its strong point. Type 303 Se is superior in this aspect. |
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Annealing |
1850-1950 F (1010-1066 C), followed by rapid cooling is the recommended practice. |
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Hardening |
This alloy does not respond to hardening by heat treatment. Cold work will raise both the hardness and strength characteristics. |
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|
Physical Data |
Density (lb / cu. in.) |
|
0.282 |
Specific Gravity |
|
7.84 |
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) |
|
0.12 |
Electrical Resistivity (microhm-cm (at 68 Deg F)) |
|
432 |
Melting Point (Deg F) |
|
2650 |
Modulus of Elasticity Tension |
|
28 |
