There are a number of places one can purchase steel tubing. One can purchase it from websites such as 'The Metal Store', 'metals4u', 'Discount Steel' and 'Metals Depot'.
One can purchase stainless steel exhaust tubing via the eBay website. One may also purchase stainless steel exhaust tubing via the Jegs website and the spdexhaust website.
Accu-Tube is a company that makes stainless steel tubing. They make stainless steel tubing for medical purposes that are hypodermic. They make sizes from small diameters to large diameters.
Stainless steel tubing can be expensive. It depends on what you are looking for. Depending on how much you need and if you need specific tubing, you can expect to pay around $100 for a small amount.
Wall thickness (Schedule)
steel tubing
They are just made of regular steel tubing.
Copper/nickel alloy tubing is easy to work with and doesn't rust.
19mm x 19mm square tubing of what ? Aluminium, Steel ? also depends on the length.........
Stainless steel tubing is used to transport liquid materials, such as water, gas, and chemicals. It is important in manufacturing as well as water treatment because it will not rust or corrode.
A good hardware store will have stainless steel tubing. A lot of the local mom and pop stores have gone out of business but if you have one try there. Otherwise try a home depot or Lowes.
In some cases, depending on the size and weight of tubular steel pipe vs the same or similar size solid steel bar, the tubular steel might be stronger. The molecular structure of the solid steel have the molecules stacked close together, any shock or stress will compress the molecules closer together with no place to go unless the steel bends or breaks. A steel tube has the hollow area which allows shock or stress to be released, it will be less likely to bend or break. It also depends on what the application is tubular steel will definitely be lighter in weight, can be filled, run wiring or plastic tubing through it. Cost is cheaper.
You can purchase poly tubing at any home improvement store such as Lowes or Home Depot.