General Information


Stainless Steel Pipe dimensions determined by ASME B36.19 covering the outside diameter and the Schedule wall thickness. Note that stainless wall thicknesses to ANSI B36.19 all have an ‘S’ suffix. Sizes without an ‘S’ suffix are to ANSI B36.10 which is intended for carbon steel pipes.


Pipe Specifications - Seamless/Welded



ASTM A312: Seamless and straight-seam welded austenitic pipe intended for high temperature and general corrosive service. Filler metal not permitted during welding. ASTM A358: Electric fusion welded austenitic pipe for corrosive and/or high temperature service. Typically only pipe up to 8 inch is produced to this specification. Addition of filler metal is permitted during welding.


ASTM A790: Seamless and straight-seam welded ferritic/austenitic (duplex) pipe intended for general corrosive service, with a particular emphasis on resistance to stress corrosion cracking.


ASTM A409: Straight-seam or spiral-seam electric fusion welded large diameter austenitic light-wall pipe in sizes 14” to 30” with walls Sch5S and Sch 10S for corrosive and/or high


ASTM A376: Seamless austenitic pipe for high temperature applications.


ASTM A813: Single-seam, single- or double- welded austenitic pipe for high temperature and general corrosive applications.


ASTM A814: Cold-worked welded austenitic pipe for high temperature and general corrosive service.



Markings on the Pipe


The full identification of the pipe should be continuously marked down its whole length, including:


~  Nominal Pipe Size (Nominal Bore)

~  Schedule (Wall Thickness)

~  Specification

~  Grade

~  Method of Manufacture (Seamless or Welded)

~  Heat Number

~  Manufacturer’s Name or Symbol




Application :



Stainless steels of various kinds are used in thousands of applications. The following gives a flavour of the full range:


Domestic –cutlery, sinks, saucepans, washing machine drums, microwave oven liners, razorblades


Architectural/Civil Engineering –cladding, handrails, door and window fittings, streetfurniture, structural sections, reinforcement bar, lighting columns, lintels, masonry supports


Transport –exhaust systems, car trim/grilles, road tankers, ship containers, ships chemicaltankers, refuse vehicles


Chemical/Pharmaceutical –pressure vessels, process piping.


Oil and Gas –platform accommodation, cable trays, subsea pipelines.


Medical –Surgical instruments, surgical implants, MRI scanners.


Food and Drink –Catering equipment, brewing, distilling, food processing.


Water –Water and sewage treatment, water tubing, hot water tanks.


General –springs, fasteners (bolts, nuts and washers), wire.


tainless steel tubing has a number of uses in a wide variety of industries. It can be used during manufacturing in processing plants or can become part of a final product. Stainless steel tubing can also be used in pipelines to transport oil, gas, water, or chemicals.


The stainless steel tubing that is supplied by Crestwood Tubulars can used in a variety of industries, including:



  • Machinery Parts
  • Food and Beverage Processing


  • Pharmaceutical
  • Biotechnology
  • Automotive


  • Marine
  • Construction
  • Chemical
  • Oil and Gas





General Types of Stainless Steel


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 between800°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,