Stainless Steel 303 is stocked by 165 North American distributors and produced by 45 large mills. Distributors will offer small quantity buys while mills will generally only sell large quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required
This material is stocked primarily in Bar Products by 156 distributors but is also available to a lesser extent in Flat Rolled Products, Wire Products, Tubular Products, Structurals, Piping Components, Casting Products, and Fasteners.
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Specifications
The following specifications cover Stainless Steel 303
- 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
Property Results
Related Metals:
- Speed-E-Mac 303(tm)
- Project 7000 Stainless 303(tm)
- 303YM(tm)
- Project 70 303(tm)
- AF 303(tm)
Chemistry Data : [top]
Carbon
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0.15 max |
Chromium
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17 - 19 |
Iron
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Balance |
Manganese
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2 max |
Molybdenum
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0.6 max |
Nickel
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8 - 10 |
Phosphorus
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0.2 max |
Silicon
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1 max |
Sulphur
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0.15 min |
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Principal Design Features
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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
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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
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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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Welding
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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
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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.
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Cold Working
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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
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1850-1950 F (1010-1066 C), followed by rapid cooling is the recommended practice.
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Hardening
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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 : [top]
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Density (lb / cu. in.)
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0.282
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Specific Gravity
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7.84
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Specific Heat (Btu/lb/Deg F - [32-212 Deg F])
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0.12
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Electrical Resistivity (microhm-cm (at 68 Deg F))
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432
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Melting Point (Deg F)
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2650
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Modulus of Elasticity Tension
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28
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Mechanical Data : [top]
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MSO currently has no data available for this grade.
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