Prodec® 303

Prodec® 303

Rolled Alloys Machining Quality (Prodec®) 303 is a fully resulfurized free-machining austenitic stainless steel melted and processed to maximize machinability. It should be considered for automatic screw machines where extensive machining is required. Prodec® 303 is nonmagnetic in the annealed condition but may become slightly magnetic as a result of cold working.

Prodec® 303 is resistant to mildly corrosive atmospheres but is inferior to 304 because of the high sulfur content. For optimum corrosion resistance, it is recommended that Prodec® 303 be chemically treated to remove sulfides from the final surface of the parts.

The high sulfur content, added for machinability, is detrimental to hot workability. If hot forming is necessary, Prodec® 304 or an intermediate sulfur level should be considered. When forging is necessary, it should be done in the 1800-2200°F range, and should be followed by annealing at 1900°F minimum and water quenching or rapid cooling by other means.The cold formability of Prodec® 303 is limited by the sulfur content. Bending with a generous bend radius may be considered for Prodec® 303. When cold forming is required, Prodec® 304 should be considered.

Prodec® 303 is not recommended for applications requiring welding. The high sulfur level in Prodec® 303 makes it prone to weld solidification cracking. If welding is necessary, AWS E312 filler metal may be considered.

Prodec® 303 is easily machined and produces small brittle chips. Prodec® 303 may be machined at high speeds with deep cuts and heavy feeds on powerful, rigid equipment using good lubricants and sharp tooling.

Chemistry

 CrNiCMnPSSiFe
MIN 17.0 8.0 - - - 0.3 - -
MAX 19.0 10.0 0.15 2.0 0.2 - 1.0 Balance

Prodec® 303 contains 0.30% minimum sulfur for enhanced machinability, substantially higher than the 0.15% minimum required by ASTM

Specifications

AMS 5640
ASTM A582
UNS S30300
Werkstoff 1.4305

Inventory

Prodec® 303 Hex Bar, Prodec® 303 Round Bar

Features

  • Melted and processed to maximize machinability
  • Improved machinability over 304/304L and 316/316L

Applications

  • Automatic screw machines

Physical Properties

Density: 0.285 lb/inch3
Modulus of Elasticity: 29 x 106 psi
Linear Expansion 60-212°F: 9.4 x 10-6/°F
Thermal Conductivity: 8.7 Btu/ft hr °F
Heat Capacity: 0.12 Btu/lb °F
Electrical Resistivity: 27.6 Ω in x 10-6

Mechanical Properties

Typical Tensile Properties

Tensile Strength, ksi 90
Yield Strength, ksi 43
% Elonation in 2 inches 55
% Reduction of area 60
Hardness, HB 180

Machining

High Speed Tooling

  Turning Cut-Off Forming Drilling Reaming End Milling Tapping Threading
Depth/Width, (dia/in) 0.005-0.200
0.002-0.004
1/16
1/4
1
2
1/4
1/2
1-2
1/4
1-2
0.050-1/2
0.050-1/2
7 threads
per inch
25 threads
per inch
Speed, (sfm) 115-130
135-180
90-120
100-130
100-130
90-120
70-80
85-95
100-110
90-110
90-110
130-160
130-160
10-115 40-50
Feed, (in/rev) 0.015-0.02
0.005-0.01
0.0015-0.002
0.0025-0.003
0.0020
0.0015
0.007
0.012
0.020
0.006
0.025
0.003
0.006
- -

Carbide Tooling

  Turning Cut-Off Forming Drilling Reaming End Milling Tapping Threading
Depth/Width, (dia/in) 0.005-0.200
0.002-0.004
1/16
1/4
1
2
1/4
1/2
1-2
1/4
1-2
0.050-1/2
0.050-1/2
7 threads
per inch
25 threads
per inch
Speed, (sfm) 375-700
600-900
275-400
325-450
375-425
350-400

700
800
-
-
300-450
360-500
- -
Feed, (in/rev) 0.025-0.030
0.007-0.010
0.002-0.004
0.004-0.008
0.003-0.006
0.002-0.004

0.005
0.007

0.004
0.008
- -

Prodec® is a registered trademark of Outokumpu