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PRODUCT MATERIAL

STAINLESS STEEL 303Download

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.

Chemistry

 

Cr

Ni

C

Mn

P

S

Si

Fe

MIN

17.0

8.0

-

-

-

0.15

-

-

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

Specifications

AMS 5640AMS 5640 Type 1AMS 5640R
ASTM A 262ASTM A 484ASTM A314
ASTM A582UNS S30300Werkstoff 1.4305

Inventory

303 Flat Bar, 303 Square Bar

Common Trade Names

303 Stainless

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