321 Seamless stainless steel pipe

The information provided is for standard stock product and does not encapsulate all available combinations. Please contact your nearest  Steels Service Centre if non-standard product is required and we will enquire about its availability through our global supply network of mills and stockists.

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Stainless Steel Piping Systems
A Stainless Steel Pipe system is the product of choice for carrying corrosive or sanitary fluids, slurries and gases, particularly where high pressures, high temperatures or corrosive environments are involved. As a result of the aesthetic properties of stainless steel, pipe is often use in architectural applications.

Stainless steel pipe can generally be defined as a heavy wall thickness tubing, with dimensions as specified by the American National Standards Institute (ANSI). Pipe dimensions are nominated by outside diameter indicated by the NPS (imperial) or DN (metric) designator and sometimes referred to as the ‘nominal bore’ – and wall thickness, is determined by the schedule number. The standard ASME B36.19 covers these dimensions.

Stainless steel pipe and fittings are supplied in the annealed condition to facilitate fabrication and ensure best corrosion resistance.  Steels can also supply stainless steel pipe with an abrasive polished finish suitable for architectural applications.

Welded pipe
Welded stainless steel pipe is manufactured from 2B or HRAP stainless steel strip – formed (to shape) and longitudinally welded to completed pipe. With the exception of very large pipe welds are made without the addition of filler metal. Standard welded pipe is in nominal lengths of 6.0 to 6.1 metres.

Manufacturing specification:

• ASTM A312M – Austenitic

• ASTM A358M – Austenitic (large diameter)

• ASTM A790M – Duplex.

Seamless Pipe
Seamless stainless steel pipe is produced from hollow billets, which are then drawn across dies until they reach the final desired pipe size and wall thickness. Standard seamless pipe is in random lengths of 6.0 to 7.5 metres.

Manufacturing specification:

• ASTM A312M – Austenitic.

• ASTM A790M – Duplex