303
Product Information
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Type 303 is a non-magnetic stainless steel, which is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium - 8% nickel stainless steel.
303 has good resistance to oxidation at temperatures up to 1700°F. In extreme oxidizing atmospheres, irregular scaling may be encountered, particularly above 1400°F.
Common Trade Names
303 Stainless
Inventory
303 Flat Bar, 303 Square Bar
Specifications
UNS S30300, Werkstoff 1.4305
ASTM: A582, A484, A314
AMS 5640
Chemical Composition, %
| Cr | Ni | C | Mn | P | S | Si | Fe | |
|---|---|---|---|---|---|---|---|---|
| MIN | 17.0 | 8.0 | - | - | - | 0.3 | - | - |
| MAX | 19.0 | 10.0 | 0.15 | 2.0 | 0.2 | - | 1.0 | Balance |
RAM 303 contains 0.30% minimum sulfur for enhanced machinability, substantially higher than the 0.15% minimum required by ASTM
Features
- Melted and processed to maximize machinability
- Improved machinability over 304/304L and 316/316L
Applications
- Automatic screw machines
- Conveyor systems
Physical Properties
Density: 0.290 lb/inch3
Melting Point: 2552°F
Thermal Conductivity at 212°F: 113/2 (Btu x in)/(hr x ft2 x °F)
Mechanical Properties
Typical Tensile Properties
| Tensile Strength, ksi | 75 |
| Yield Strength, ksi | 30 |
| % Elongation in 2 inches | 35 |
| % Reduction of area | 50 |
Machining
Feeds and Speeds
Starting Feeds and speeds with high speed tooling (Annealed Type 303*)
| Tool | Inch | Speed, sfpm** | Feed, inches/revolution |
| Form Tool (width) | 1/4 1/2 3/4 |
110 105 100 |
0.0026 0.0022 0.0019 |
| Box Tool (depth) | 1 1/8 1/4 |
115 105 100 |
0.0065 0.0060 0.0055 |
| Twisting Drill (diameter) | 1/4 1/2 3/4 |
65 70 75 |
0.0045 0.0050 0.0055 |
| Sizing Reamer | 1/2 and under 1/2 and over |
90 90 |
0.0055 0.0085 |
| Finishing Reamer | All | 35 | 0.0035 |
| Tapping (Cut Threads) | - | 15/30 | - |
* As Processed for Best Machinability, **sfpm = Surface feet per minute
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