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Heat Treatment:
Our Services and Their Processes
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Annealing
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This process involves a
controlled heating and slow cooling which induces
softness. Additionally, the process removes gases,
relieves stresses and enhances the mechanical properties
in alloyed steels.
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This is generally
performed at temperatures around 700°C. |
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Normalising
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This process is much like
Annealing, but the cooling process is much faster. This
results in increased strength but less ductility in the
metal. It also produces a higher yield strength with greater
tensile strength, and in most instances, a higher impact
resistance.
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Preheating
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This
is a very effective means of preventing weld metal or base
metal cracking. It is the application of heat to the base
metal prior to a welding or cutting operation. It does not
change the properties of the steel, but it is advisable
under certain conditions to drive off moisture and helps to
ensure even expansion to eliminate undesirable stresses.
Concurrent heating during welding (also referred to as
preheating) retards the cooling thus preventing the
formulation of an under bead crack. |
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Refractory Dry-Out and
Curing
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Spheres,Vessels,Drums,
Incinerators, Boilers - On Site In Situ
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Solution Heat Treatment
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This process is performed
on certain types of Austenitic Stainless Steels to prevent
decay in weldment.
This is done at very
high temperatures(e.g 1050°C) and the cooling is very
rapid.
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Stress Relieving
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This is the process of
heating steel to a relatively high temperature (e.g. 590oC
- 700oC) shortly after
welding, and maintaining
that temperature for a specific period of time. The
purpose is to reduce internal stresses, caused by welding,
quench hardening or by cold working. It also has an
advantageous effect on the elasticity, ductility and
strength of the metal.
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