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Terminology
Style
Designation: Expanded metal products are designated by a
series of numbers which identify a given style. The First Number
is the nominal diamond dimension Short Way of Design (SWD).
The Second Number used in conjunction with the first number
MAY specify the gauge of metal, weight per hundred square foot,
or may have some other significance. Therefore, the word "GAUGE"
SHOULD NEVER BE ADDED TO THE STYLE DESIGNATION. Grating products
are designated by weight per square foot of the finished
product.
Strands: The individual slit metal strips, or slides
of an expanded metal pattern. Strand Thickness in standard expanded
metal is the gauge or thickness of the sheet or coil from which
the expanded metal was produced. In flattened expanded metal
it is the overall thickness of the finished sheet. Strand Width
in standard expanded metal is the amount of metal fed into the
expanding machine, which is slit and stretched with each stroke
of the upper die. In flattened expanded metal, it is as the
name implies, the width of the strand.
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Percent
Open Area: The amount of open area to determine the amount
of light or air passage.
SWD: The distance from a point on a bond to a corresponding
point on the following bond measured across the Short Way of
Design. This distance is also sometimes referred as "pitch SWD".
LWD: The distance from a point on a bond to a corresponding
point on the following bond measured across the Long Way of
Design. This distance is also sometimes referred as "pitch LWD".
SWO: Short Way of Opening, the distance measured from
the inside of the bond across to the inside of the bond SWD.
LWO: Long Way of Opening, the distance measured from
the inside of the bond across to the inside of the
bond LWD.
Bond: The intersection of two strands and it is always
the width of two strands.
Overall Thickness: The actual measurement of the thickness
of the mesh measured at the bond.
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Standard Expanded Metals: Expanded
metal as it comes off the machine. The strands and bonds
are set at a uniform angle to the plane of the sheet. This
adds strength and rigidity, allows air circulation, distributes
the load on the metal to the supporting frames as well as making
a skid resistant surface. Standard expanded metal is abbreviated
XM.
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Flattened Expanded Metal: Manufactured
by passing the standard expanded sheet through a cold roll reducing
mill parallel to the LWD. By flattening the sheet, the
bonds and strands are turned down to produce a smooth and flat
surface, reducing the overall thickness and elongating the diamond
pattern (LWD). Cross roll flattening is done by passing
the expanded metal sheet through a cold roll reducing mill parallel
to the SWD. The result is the same except the diamond
pattern SWD is elongated. Flattened expanded metal is
abbreviated FXM.
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Grating: Grating is a standard
expanded metal pattern produced from heavier gauge low carbon
steel plates. The strands and openings are considerably larger
than the other meshes. Ideal for use whenever a strong
durable and lightweight surface is required. Although
used primarily for pedestrian traffic, grating can accommodate
heavier loads when properly supported.
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Decorative Patterns: Specially
designed expanded metal for use in architectural and decorative
applications. These design can be used to provide privacy
and to control light and air while allowing visibility.
Sun screens, room dividers, and building facades are only a
few of the possible design possibilities. Available in
carbon steel, aluminum and other alloys in a wide range of patterns
and gauges. Most of these patterns are produced on a special
order basis only.
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304
The most widely used or the stainless and heat resisting steels.
Offers good corrosion resistance to many chemical corrodents
as well as industrial atmospheres. This material is also
less susceptible to carbide precipitation during welding and
to subsequent intergranular corrosion.
304-L Extra low carbon variation of 304 that avoids
harmful carbide precipitation due to welding. 304-L offers
the same corrosion resistance as 304 and, slightly lower mechanical
properties. This alloy is employed for extremely server
conditions where intergranular corrosion may occur.
309 Good strength at high temperatures. Corrosion
resistance superior to that of 304. Oxidation resistance
to 2000 degrees F. High resistance to scale. Excellent
in resisting sulfite liquors, nitric acid, nitric-sulfuric mixtures,
acetic, citric and lactic acids.
310 Moderate strength at high temperatures.
Corrosion resistance better than 304. Excellent oxidation
resistance under constant or moderately cyclic conditions.
Higher alloy content improves the characteristics of this material
to that of 309.
316 Improved corrosion and pitting resistance as well
as better strength at higher temperatures than 304. This
material is a Molybdenum bering stainless that processes a greatly
increased resistance to chemical attack than that of the basic
chromium-nickel alloys.
316-L Low carbon variation of 316 to avoid carbide precipitation
due to welding Same corrosion resistance as 316.
321 Stabilized with titanium for weldments subject
to severe corrosion. No carbide precipitation. Excellent
resistance to a variety of corrosive media. Immune to
most organic chemicals, dyestuffs, and many inorganic chemicals.
330 Austenitic alloy with excellent oxidation resistance,
especially under cyclic conditions. Resists sulfur free
furnace atmospheres containing carbon and nitrogen.
333 Superior strength at temperatures to 2000 degrees
F. Outstanding oxidation resistance, excellent resistance
to shock, dimensional stability, resistance to creep, distortion,
Metallurgical stability.
409 Lowest cost stainless. Used extensively
in automotive exhaust systems. Due to its combination
of lwo cost and good resistance to oxidation and corrosion this
material is a good alternative for use on parts where surface
appearance is not important. (MAGNETIC)
410 Heat treatable stainless used widely where corrosion
is not severe, i.e.:air, fresh water, some chemicals and food
acids. (MAGNETIC)
430 This is the most popular of the non-hardenable
chromium stainless steels. It combines good corrosion
and heat resistance with good mechanical properties. Oxidation
resistance to 1500 degrees F. widely used in both industrial
and consumer products. (MAGNETIC)
1100 Commercially pure aluminum (99% min.).
Excellent corrosion resistance, workability and weldability
- high in thermal conductivity. Tensile strength range
14,000 to 24,000 psi.
3003 Alloyed with 1.2% manganese to provide a tensile
strength range of 17,000 to 30,000 psi. Also has excellent
workability, weldability and corrosion resistance.
5005 Alloyed with .8% magnesium. Tensile
strength range from 18,000 to 30,000 psi. Same excellent
workability, weldability and corrosion resistance as 1100 and
3003. Specified for applications that are comparable to
1100 and 3003 where anodizing is required.
5052 Alloyed with 2.5% magnesium. Tensile
strength range 31,000 to 44,000 psi. Very good corrosion
resistance, good workability, weldability and strength.
** Niles Expanded Metals stocks only 3003 aluminum |
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