1. Hot-rolled process can significantly reduce consumption, reduce
costs
Where it can be hot-rolled billet should be hot-rolled metal,
because metal hot deformation resistance than cold-rolled low, can
significantly reduce energy consumption during rolling.Normally,
the finished products of hot-rolled seamless steel pipe in price is
lower than cold-drawn seamless steel pipe.
2. The hot rolling process can improve the performance of metals
and alloys
Because coarse grains of hot-rolled state can cast broken,
microcracks healing and reduce or eliminate casting defects,
converting low ductility cast structure into a higher plastic
deformation of tissue.
Steel is considered to be carbon steel when no minimum content is
specified or required for chromium, cobalt, niobium, molybdenum,
nickel, titanium, tungsten, vanadium or zirconium, or any other
element to be added to obtain a desired alloying effect; when the
specified minimum for copper does not exceed 0.40 percent; or when
the maximum content specified for any of the following elements
does not exceed the percentages noted: manganese 1.65, silicon
0.60, copper 0.60.
Different types of carbon steel pipes
Classes of carbon steel Carbon content %
Ultra-high carbon steel 1.00 – 2.00
High carbon steel 0.60 – 0.99
Medium carbon steel 0.30 – 0.59
Low carbon steel 0.16 – 0.29
Mild carbon steel 0.05 – 0.15
Black steel pipe is uncoated and made without steam, and therefore,
it is widely used for transporting gas like propane and natural gas
to residential and commercial building. Black steel pipe is
manufactured as seamless pipe which makes it a better type for gas
transportation. It can be used for fire sprinkler system since it
can prevent fire better than galvanized pipe. Since it has a dark
color surface that is form by iron oxide during the
