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Introduction Specification Comparison      Material      Manufacture      Dimensional Tolerances           Wall Thickness           Outside Diameter      Surface Finish      Weld Bead      Heat Treatment      Mechanical Properties      Non-Destructive Inspection Which Specification

This article provides the alternative specifications for the Australian food industry service. Such specifications include:

ASTM A554 “Specification for welded stainless steel mechanical tubing”

ASTM A270 “Specification for seamless and welded austenitic stainless steel sanitary tubing”

ASTM A269 “Specification for seamless and welded austenitic stainless steel tubing for general service”

ASTM A249 “Specification for welded austenitic steel boiler, super heater, heat exchanger, and condenser tubes”

AS 1528.1 “Specification for tubes (stainless steel) for the food industry”

AS1528 was revised in 2001 by key stakeholders in the Australian food manufacturing and tube industries. AS 1528 is unique, in that it covers all the associated fittings in addition to the tube.

All specifications pertain to common grades, such as grades 304, 304L, 316 and 316L. AS1528.1 covers all grades of duplex and austenitic stainless steel listed in ASTM A240.

All specifications need fusion-welded products without filler metals. Specifications such as ASTM A270, ASTM A269 and AS 1528 also cover seamless products.

ASTM A554 requires ±10% of nominal - no nominal thicknesses are stipulated.

ASTM A270 requires ±12.5% of nominal - no nominal thicknesses are stipulated.

ASTM A269 requires ±10% of nominal for sizes over ½" - no nominal thicknesses are stipulated.

ASTM A249 requires ±10% of nominal - no nominal thicknesses are stipulated.

AS 1528 specifies nominal thicknesses of 1.6mm for all outside diameters, (ODs) except 2 mm for 203.2 mm OD; other thicknesses can be specified by purchasers. Standard tolerance is +nil, -0.10mm. The all-minus tolerance recognizes the usual practice for tube, to all specifications, to be produced towards the lower limit of the tolerance range. A range of between 1.52 and 1.58 mm is typical. This tolerance also applies to tube fittings.

Table 1. Specification requirements for standard inch series OD tube sizes

* ASTM A554 tolerances for the weld bead removed condition. * AS1528 also covers OD sizes 12.7, 19.0, 31.8, 127.0, 152.4 and 203.2mm

All these tube specifications provide limits for wall thickness and OD. The inside diameters are not mentioned separately.

The surface finish properties of various specifications, recommended for Australian food industry services, are as follows:

Listed below are the weld bead procedures for different steel grades:

The handling products used in the food industry require a tube without weld bead remnant on the inner surface.

The following stainless steel grades can be heat-treated:

The mechanical properties of various stainless steel grades, commonly used in food industries, are given below:

The non-destructive inspection procedures for different steel grades are listed below:

The following section provides a summary on each specification employed in food industries:

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