Materials
For a detailed discussion about the materials for gas cylinders see Pressure vessel.
Design codes and application standards along with the cost of materials dictated the choice of steel with no weldings for most gas cylinders, treated to be anti corrosive. There have been some newly developed lightweight gas cylinders from composite materials. Due to the very high tensile strength of carbon fibre, these vessels can be very light, but are much more difficult to manufacture.
Read more about this topic: Gas Cylinder
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