Prochem stock welded tube in a variety of finishes to suit market needs. These include “as welded”, “as welded polished”, “welded bright annealed”, “welded annealed polished”, and others on request. Our standard size range covers 12.7mm (½") through 152.4mm (6") OD in 1.6mm WT (16 SWG) and 203.2mm (8") OD in 2.00mm WT (14 SWG). Materials in stock include 304 and 316 stainless steel to ASTM A269 or ASTM A554 and AS1528.1 as standard stock, with other grades, standards or sizes available on request.

Definitions

LEGEND

AW AS WELDED
AWM AS WELDED POLISHED Mirror
AWP3 AS WELDED POLISHED 320 Grit
AWP AS WELDED POLISHED 600 Grit
AWA AS WELDED ANNEALED
AWAP AS WELDED ANNEALED-POLISHED
CW COLD WORKED
CWP COLD WORKED POLISHED

“AW” & “AWP” ARE MANUFACTURED TO ASTM A554
“CW” & “CWP” ARE MANUFACTURED TO AS1528
Tubes of this quality are suitable for use in the food industry. Available in Grades T304 and T316

“AWA” & “AWAP” ARE MANUFACTURED TO ASTM A269 annealed condition

POLISHED TUBE (all supplied in plastic sleeves)
Our Standard polish is: Round Tube: 320 Grit, 600 Grit and Mirror finish Square Tube: 180 Grit

WELDED MANUFACTURING PROCESSES

Continuously Longitudinal Welded

A coil of stainless steel strip is fed into the tube mill. The strip passes through forming rolls which progressively form the material ready for welding. The welding process is then carried out, usually tungsten inert gas (TIG). The product passes under a sanding belt which removes the weld bead on the outside diameter. The product can then be subjected to the proper post-weld treatment to bring it to specification.

Fabricated Welded

This method utilises sheets or plates of the required thickness and developed width, to manufacture the pipe or tube. The plate is pressed into shape with a press brake, which is equipped with the appropriate tooling. Following the forming operation the product is fed through a series of rolls to ensure the correct cross sectional form during the welding operation which follows. After welding, the product can be subjected to the proper post-weld treatment required to bring it to specification.

Spirally Welded

Spirally welded tube is produced by driving coil strip from a de-coiler, through drive rollers, and into a cylindrical former (or shoe), at a pre-determined angle. The edges of the resulting "spring-like" profile are arc welded as they feed past a fixed welding torch. This process is particularly suitable for making large diameter tubes, with relatively thin wall thicknesses, to close tolerances of straightness and ovality.

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