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STAINLESS STEEL 303 - ALLOY COMPOSITION

Find below the search results for the material you've specified. Please note here this information is NOT to be used for design purposes, and in no event shall MSO be liable for any damages arising from the misuse of this information

Stainless Steel 303

Related Metals:

Speed-E-Mac 303(tm)
Project 7000 Stainless 303(tm)
303YM(tm)
Project 70 303(tm)
AF 303(tm)                                    

Specifications:

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).


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.


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.


Corrosion Resistance

Resistant to a variety of organic and inorganic chemicals, fresh water and atmospheric corrosion.


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.


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.


Annealing

1850-1950 F (1010-1066 C), followed by rapid cooling is the recommended practice.


Hardening

This alloy does not respond to hardening by heat treatment. Cold work will raise both the hardness and strength characteristics.


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

Mechanical Data

MSO currently has no data available for this grade.

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