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SPECIFICATION
DATA
SHEET:
304 Stainless
Steel
| BAR
|
TUBE
|
PIPE
|
| PSQ
SHAFT |
WELDING
ROD |
CASTINGS
|
| FORGINGS
|
PLATE
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FLANGES |
| TG&P
SHAFTS |
SHEET
|
FITTINGS |
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Type
304
Type
304 stainless steel is basically the same as Type 302 except for
a higher chromium and lower carbon content. Its lower carbon
minimizes chromium carbide precipitation due to welding and its
susceptibility to intergranular corrosion. In many instances,
Type 304 can be used in the “as welded” condition while Type
302 must be annealed in order to retain adequate corrosion
resistance.
Type
304 has the same excellent combination of strength, corrosion
resistance and workability as Type 302, and it costs the same.
Consequently this type is widely used and is more popular than
type 302.
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Type
304L
Type
304L is an extra low carbon variation of Type 302. The .03%
maximum carbon content eliminate carbide precipitation due to
welding. Consequently, the alloy can be used in the “as
welded” condition even in severe corrosive conditions. In many
cases it eliminates the necessity of annealing weldments except
for applications where stress relief is specified. Type 304L has
slightly lower mechanical properities than Type 304.
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Available
Forms
Types
304 and 304L stainless steel is available in:
 | Bar
| Wire
| Sheet
| Strip
| Billets |
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Specifications
The
following specifications are generally applicable:
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Composition
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Property
|
Type
304%
|
Type
304L%
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Carbon
|
.08
max
|
.03
max
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Manganese
|
2.00
max
|
2.00
max
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Phosporus
|
.045
max
|
.045
max
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Sulfur
|
.030
max
|
.030
max
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Silicon
|
1.00
max
|
1.00
max
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Chromium
|
18.0-20.0
|
18.0-20.0
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Nickel
|
8.0-12.0
|
8.0-12.0
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Type
304L
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Property
|
Sheet
& Strip
|
Bar
& Wire
|
Sheet
& Strip
|
Bar
& Wire
|
|
Ultimate
tensile strength, psi
|
85,000
|
85,000
|
80,000
|
80,000
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|
.2%
Yield strength, psi
|
35,000
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35,000
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30,000
|
30,000
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Elongation,
% om 2”
|
55
|
60
|
55
|
60
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Rockwell
hardness
|
B80
|
B80
|
N75
|
B75
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Reduction
of area, %
|
NA
|
70
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NA
|
70
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Impact
strength, Izod V Notch, ft-lbs
|
NA
|
100-120
|
NA
|
100-120
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Endurance
limit, psi
|
NA
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34,000
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NA
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34,000
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Typical
Applications
| Low
carbon Content of 304 and 304L is more conducive to welding
than type 302
| Applications
include architectural mouldings and trim and kitchen
equipment
| Alloys
are widely used for welded components of processing
equipment for textile |
| |
Machinability
When
machined, Types 304 and 304L will work-harden. Therefore
tools must not ride or glaze the surface without cutting. Heavy
feeds and slow speeds are recommended
Weldability
Both
these stainless steels are readily welded by most welding
processes such as TIG, MIG and resistance welding.
However, all arc welding not using a shielded gas should have
the filler rods coated. Type 308 and 308L welding rods are
suggested for best results.
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Formability
Types
304 and 304L have very good drawability. Their combination of
low yield strength and high elongation permits successful
forming complex shapes. However,these grades work harden
rapidly. To relieve stresses produced in severe forming
spinning, parts should be full annealled or stress-relief
annelaed as soon as possible after forming
Corrosion
Resistance
Like
Type 302, Types 304 and 304L stainless steel have excellent
resistance to a wide range of corrosive media and to atmospheric
exposures. The low carbon content of Type 304 and
especially 304L, by reducing or eliminating carbide
precipitation due to welding, makes these types of stainless
suitable for a much wider range of corrosive service than Type
302.
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