More A The tubes shall be made from flat-rolled steel by an automatic welding process without the addition of filler metal. Tubes shall be furnished in one of the following shapes - round, square, rectangular, or special. Heat analysis shall be performed wherein several grades of steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, titanium, columbium, and tantalum.

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The possible conditions range from a "mill finish" i. Surface finishes may also be specified in terms of Ra values, but no limits are given in the specification. Clause Thus a large proportion of A tube used in the Australian market is supplied in the externally polished or buffed conditions, in the range of about - , or with a very highly polished Surface , typically stated as The internal Surface is required to be 2B finish, quoted as typically 0.

Work done by Atlas Steels indicates that for 1. With weld bead rolling it would be expected that the finish of the weld would be similar to that of the parent tube. Weld Bead The food industry generally requires a tube with no weld bead remnant on the inside Surface if the intended service is handling product. Weld bead rolling is not generally possible in sizes below There is also a requirement that the internal Surface be smooth, with no lack of weld penetration and no crevices adjacent to welds.

This requirement addresses the heart of the issue - freedom from sites for product or bacterial build-up. Heat treatment is annealing also referred to as solution treatment or solution annealing.

In practice this is not a common requirement for food industry tube unless it requires significant bending or flaring. Full tensile and hardness testing is standard, as are flattening, flange and reverse bend.

It does specify weld bead removal, but this requirement can be met from other standards, without unnecessarily calling up the stringent mechanical properties of A The annealing mandatory in A will also not be required in most food applications. A high cost option. Conversely, it does not specify internal weld bead removal, which generally is a food industry requirement. It will prove uncompetitive against un-annealed tube. The finish options available in this specification are very comprehensive.

It is specifically directed at food industry applications, specifying the features necessary to ensure high integrity lines for hygienic applications without requiring high cost additional mechanical testing. Annealing is possible if required and Surface finishes can be further specified. Batch traceability marking considered essential to validate many food and pharmaceutical plants is mandatory. Another key benefit is the existence of matching specifications for associated tube fittings.


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