Stainless steels are highly resistant to corrosive attack and to oxidation at high temperatures. in general, resistance to corrosion and oxidation increases progressively, though not proportionately, with the increase in chromium content.

Stainless steel pipe and tubing are used for a variety of reasons: to resist corrosion and oxidation, to resist high temperatures, for cleanliness and low maintenance costs, and to maintain the purity of materials which come In contact with stainless. The inherent characteristics of stainless steel permits the design of thin wall piping systems without fear of early failure due to corrosion. The use of fusion welding to join such piping eliminates the need for threading.

Type 304 stainless is the most widely used analysis for general corrosive resistant tubing and pipe applications, it is used in chemical plants, refineries, paper mills, and food processing industries. Type 304 has a maximum carbon content of .08%. It is not recommended for use in the temperature range between 800° F and 1650° F due to carbide precipitation at the grain boundaries which can result in inter-granular corrosion and early failure under certain conditions.

Type 304L. Is the same as 304 except that a .03% maximum carbon content is maintained which precludes carbon precipitation and permits the use of this analysis in welded assemblies under more severe corrosive conditions. Type 318 is much more resistant to pitting than other chromium nickel alloys due to the addition of 2% to 3% molybdenum. it is particularly valuable wherever acids, brines, sulphur water, seawater or halogen salts are encountered. Type 316 is widely used in the sulphite paper industry and for manufacturing chemical plant apparatus, photographic equipment, and plastics.

Type 316L, like 304L, is held to a maximum carbon content of .03%. This permits its use in welded assemblies without the need of final heat treatment. It is used extensively for pipe assemblies with welded fitting.

Other fields where stainless steel pipe and tubing are used are: aviation, electronics, automotive, cyrogenic, marine, air conditioning and heating, medical, architectural and textiles.

SIZES OF PIPES

Sizes for Stainless Steel Tube

Stainless steel pipes, which were coming into more common use in the mid 20th century, permitted the use of thinner pipe walls with much less risk of failure due to corrosion. This led to the development of stainless steel tubing, which due to it’s thinner wall it could not be threaded together according to the ASME code, and therefore was fusion welded.

This led to the development of a range of hygienic stainless steel tube and fittings which could be used in applications requiring a clean and sanitary flow of liquids and where it is essential to avoid contamination of the products being carried. These applications cover the food processing, beverage, biotech and pharmaceutical industries including breweries and dairies.

The applications are low pressure with a maximum of 10 Bar

• The products are available in grades 304L and-316L.

• The size range is from ½”to 6 inch O/D.

The tube and fittings are of welded construction with the internal bead rolled and polished to eliminate crevices, thus preventing interruptions to the flow and eliminating the risk of contamination or bug traps as well as facilitate easy cleaning.

Size range of stainless steel erw pipes 1/4" nb, 1/2" nb, 3/4" nb, 1" nb, 1-1/4" nb, 1-1/2" nb, 2" nb, 2-1/2" nb, 3" nb, & 4" nb, 5" nb, 6" nb, 8" nb, 10" nb, 12" nb, 14" nb, 16" nb, 18" nb, 20" nb, 22" nb & 24" nb in schedule 5, schedule 10, schedule 20, schedule 40, schedule 80, schedule 160, schedule xxs and schedule std.

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