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Tube Fabrication Terms
–
Steel that is alloyed with moderate amounts of chromium and other elements,
such as molybdenum. Alloy steel is distinguished from stainless steel
by good hardening characteristics and from tool steel by possessing better
“toughness” after hardening.
– The heating and
cooling of steel to remove stresses, alter physical, mechanical and metallurgical
properties, increase corrosion resistance and thermally treat steel prior
to age hardening.
– The curved section of
a bent tube.
– Tubes that are not
given heat treatment after the initial welding.
– A family of chromium
nickel stainless steels that have good corrosion resistance and good formability,
but can only be hardened by cold working.
– Less commonly known
as the "bend form" or the "radius die," it is the
primary tool on a rotary-draw tube-bending machine. The bend die is the
form against which the tube is clamped and then drawn around to produce
a bend.
– The process
of annealing in a controlled atmosphere so that dark, adherent oxides
do not form on the metal.
– The amount
of pressure that will make a tube fail or burst by exceeding the tensile
strength of the material from which the tube is made.
– A measure of warp in
tubing material or the deviation from straightness.
– The normal method
of rotary-draw tube-bending, which is done without heating the tubing
material.
– A measure of a tube’s
ability to deform without fracturing.
– The amount of permanent
extension of the material before it fractures.
– A term that
refers to the state of the tube after the weld has been processed to produce
uniform strength and dimensions and the tube has been annealed for corrosion
resistance.
– Tests used
to evaluate the quality of finished products, such as crush, flare, bend,
flange, flatten, reverse flatten, reverse bend and expanding.
– The deformation of
a round tube into an elliptical shape or a symmetrical flattening of a
round tube. Ovality is the measure of the difference between the maximum
and minimum outside diameters of a round tube.
– A protective layer
made of oxides, which is on the outside of tubes, that resists corrosion.
– The chemical removal
of oxides on the surface of metals.
– Tubing specified
for the containment of liquids and gasses, as opposed to structural or
mechanical purposes.
– The unbent section
of a bent tube.
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